{"id":10021035,"date":"2025-10-16T23:42:35","date_gmt":"2025-10-16T15:42:35","guid":{"rendered":"https:\/\/itmax.cn\/?p=10021035"},"modified":"2025-10-16T23:42:35","modified_gmt":"2025-10-16T15:42:35","slug":"%e4%bb%8e-json-%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%88%b0-java-%e5%af%b9%e8%b1%a1%ef%bc%9afastjson-1-2-83-%e5%85%a8%e7%a8%8b%e8%a7%a3%e6%9e%90%ef%bd%9c%e5%be%97%e7%89%a9%e6%8a%80%e6%9c%af","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10021035","title":{"rendered":"\u4ece JSON \u5b57\u7b26\u4e32\u5230 Java \u5bf9\u8c61\uff1aFastjson 1.2.83 \u5168\u7a0b\u89e3\u6790\uff5c\u5f97\u7269\u6280\u672f"},"content":{"rendered":"<h2>\u4e00\u3001\u6982\u8ff0<\/h2>\n<p>Fastjson \u662f\u963f\u91cc\u5df4\u5df4\u5f00\u6e90\u7684\u9ad8\u6027\u80fd JSON \u5e8f\u5217\u5316\u5904\u7406\u5e93\uff0c\u5176\u4e3b\u8981\u4ee5\u5904\u7406<strong>\u5c0f\u6570\u636e<\/strong>\u65f6\u901f\u5ea6\u6700\u5feb\u800c\u8457\u79f0\uff0c\u529f\u80fd\u5168\u9762\u3002Fastjson1.X\u7248\u672c\u76ee\u524d\u5df2\u505c\u6b62\u7ef4\u62a4\uff0c\u88abFastjson2.X\u4ee3\u66ff\uff0c\u4f461.X\u7248\u672c\u56fd\u5185\u88ab\u5e7f\u6cdb\u4f7f\u7528\uff0c\u901a\u8fc7\u5b66\u4e60\u5176\u6280\u672f\u67b6\u6784\uff0c\u5256\u6790\u67b6\u6784\u4e0a\u4f18\u7f3a\u70b9\uff0c\u5bf9\u6280\u672f\u4eba\u5458\u63d0\u5347\u8f6f\u4ef6\u8bbe\u8ba1\u5de5\u7a0b\u5b9e\u8df5\u80fd\u529b\u5f88\u6709\u4ef7\u503c\u3002<\/p>\n<p>\u9996\u5148\u6211\u4eec\u5bf9\u201c\u5e8f\u5217\u5316 \/ \u53cd\u5e8f\u5217\u5316\u201d\u6982\u5ff5\u4e0a\u5efa\u7acb\u76f4\u89c2\u8ba4\u8bc6\uff0c\u628aJava\u5bf9\u8c61\u8f6c\u5316\u4e3aJSON\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u7684\u8fc7\u7a0b\u53eb\u505a<strong>\u5e8f\u5217\u5316<\/strong>\u64cd\u4f5c\uff0c\u53cd\u4e4b\u5219\u53eb<strong>\u53cd\u5e8f\u5217\u5316<\/strong>\u3002\u5982\u679c\u628a\u201c\u5e8f\u5217\u5316 \/ \u53cd\u5e8f\u5217\u5316\u201d\u653e\u5230\u6574\u4e2a\u8ba1\u7b97\u673a\u7cfb\u7edf\u7684\u5750\u6807\u7cfb\u91cc\uff0c\u53ef\u4ee5\u628a\u5b83\u770b\u6210\u4e00\u6b21\u6570\u636e\u7684\u201c\u8de8\u8fb9\u754c\u642c\u5bb6\u201d\u3002<\/p>\n<p>\u5bf9\u8c61\u5728\u201c\u5185\u5b58\u4e16\u754c\u201d\u91cc\u6d3b\u5f97\u5f88\u597d\uff0c\u4f46\u53ea\u8981\u4e00\u79bb\u5f00\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4\uff08\u7f51\u7edc\u3001\u78c1\u76d8\u3001\u6570\u636e\u5e93\u3001\u6d4f\u89c8\u5668\u3001\u5f02\u6784\u8bed\u8a00\uff09\uff0c\u5c31\u5fc5\u987b\u5148\u6253\u6210\u5305\u88f9\uff08\u5e8f\u5217\u5316\uff09\uff0c\u5230\u5bf9\u5cb8\u518d\u62c6\u5305\u88f9\uff08\u53cd\u5e8f\u5217\u5316\uff09\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"212\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdmJzg\" alt=\"image.png\" title=\"image.png\"><\/p>\n<h2>\u4e8c\u3001\u6838\u5fc3\u6a21\u5757\u67b6\u6784<\/h2>\n<p>\u4ece\u9ad8\u5c42\u6b21\u89c6\u56fe\u770bFastjson\u6846\u67b6\u7684\u7ed3\u6784\uff0c\u4e3b\u8981\u53ef\u4ee5\u5206\u4e3a<strong>\u7528\u6237\u63a5\u53e3\u5c42\u3001\u914d\u7f6e\u7ba1\u7406\u5c42\u3001\u5e8f\u5217\u5316\u5f15\u64ce\u3001\u53cd\u5e8f\u5217\u5316\u5f15\u64ce\u548c\u5b89\u5168\u9632\u62a4\u5c42<\/strong>\u3002\u5176\u4e2d<strong>\u7528\u6237\u63a5\u53e3<\/strong>\u63d0\u4f9b\u4e86\u95e8\u9762\u7c7b\u7528\u6237\u7f16\u7801\u76f4\u63a5\u4e0e\u95e8\u9762\u7c7b\u4ea4\u4e92\uff0c\u964d\u4f4e\u4f7f\u7528\u590d\u6742\u5ea6\uff1b<strong>\u914d\u7f6e\u7ba1\u7406\u5c42<\/strong>\u5141\u8bb8\u7528\u6237\u5bf9\u6846\u67b6\u884c\u4e3a\u8fdb\u884c\u914d\u7f6e\uff1b<strong>\u5e8f\u5217\u5316\u5f15\u64ce<\/strong>\u662f\u5e8f\u5217\u5316\u64cd\u4f5c\u7684\u6838\u5fc3\u5b9e\u73b0\uff1b<strong>\u53cd\u5e8f\u5217\u5f15\u64ce<\/strong>\u662f\u53cd\u5e8f\u5217\u5316\u64cd\u4f5c\u7684\u6838\u5fc3\u5b9e\u73b0\uff1b<strong>\u5b89\u5168\u6a21\u5757<\/strong>\u89e3\u51b3\u6846\u67b6\u5b89\u5168\u95ee\u9898\uff0c\u5141\u8bb8\u7528\u6237\u9488\u5bf9\u5b89\u5168\u95ee\u9898\u8bbe\u7f6e\u9ed1\u767d\u540d\u5355\u7b49\u5b89\u5168\u68c0\u67e5\u529f\u80fd\u3002\u4e0b\u56fe\u4e3aFastjson\u6a21\u5757\u5173\u7cfb\u56fe\uff1a<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"277\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdmJzh\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p>\u6a21\u5757\u5173\u7cfb\u56fe<\/p>\n<h2>\u4e09\u3001\u9879\u76ee\u7ed3\u6784<\/h2>\n<pre><code>com.alibaba.fastjson\/\n\u251c\u2500\u2500 JSON.java \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0# \u6838\u5fc3\u5165\u53e3\u7c7b\n\u251c\u2500\u2500 annotation\/ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0# \u6ce8\u89e3\u5b9a\u4e49\n\u251c\u2500\u2500 asm\/ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0# ASM\u5b57\u8282\u7801\u7cbe\u7b80\u5e93\n\u251c\u2500\u2500 parser\/ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0# \u89e3\u6790\u5668\u6a21\u5757\n\u2502 \u00a0 \u251c\u2500\u2500 DefaultJSONParser.java \u00a0# \u9ed8\u8ba4JSON\u89e3\u6790\u5668\n\u2502 \u00a0 \u251c\u2500\u2500 JSONLexer.java \u00a0 \u00a0 \u00a0 \u00a0 \u00a0# \u8bcd\u6cd5\u5206\u6790\u5668\u63a5\u53e3\n\u2502 \u00a0 \u251c\u2500\u2500 JSONScanner.java \u00a0 \u00a0 \u00a0 \u00a0# \u8bcd\u6cd5\u5206\u6790\u5668\u5b9e\u73b0\n\u2502 \u00a0 \u2514\u2500\u2500 deserializer\/ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0# \u53cd\u5e8f\u5217\u5316\u5668\n\u251c\u2500\u2500 serializer\/ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0# \u5e8f\u5217\u5316\u5668\u6a21\u5757\n\u2502 \u00a0 \u251c\u2500\u2500 JSONSerializer.java \u00a0 \u00a0\u00a0# JSON\u5e8f\u5217\u5316\u5668\n\u2502 \u00a0 \u251c\u2500\u2500 SerializeConfig.java \u00a0 \u00a0# \u5e8f\u5217\u5316\u914d\u7f6e\n\u2502 \u00a0 \u2514\u2500\u2500 ObjectSerializer.java \u00a0\u00a0# \u5bf9\u8c61\u5e8f\u5217\u5316\u5668\u63a5\u53e3\n\u251c\u2500\u2500 spi\/ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0# SPI\u6269\u5c55\u673a\u5236\n\u251c\u2500\u2500 support\/ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0# \u6846\u67b6\u652f\u6301\n\u2514\u2500\u2500 util\/ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0# \u5de5\u5177\u7c7b\n<\/code><\/pre>\n<h3>3.1 \u9879\u76ee\u7ed3\u6784\u8bf4\u660e<\/h3>\n<p>\u4e3b\u8981\u53ef\u4ee5\u5212\u5206\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u6838\u5fc3\u6a21\u5757\uff08\u5305\uff09\uff1a<\/p>\n<p><strong>com.alibaba.fastjson (\u6838\u5fc3 API \u4e0e\u6570\u636e\u7ed3\u6784)<\/strong><\/p>\n<ul>\n<li>\u5173\u952e\u7c7b :<\/li>\n<li>\n<ul>\n<li>JSON.java: \u6574\u4e2a\u5e93\u7684\u95e8\u9762\uff08Facade\uff09\uff0c\u63d0\u4f9b\u4e86\u6700\u5e38\u7528\u3001\u6700\u4fbf\u6377\u7684\u9759\u6001\u65b9\u6cd5\uff0c\u5982 toJSONString() (\u5e8f\u5217\u5316), parseObject() (\u53cd\u5e8f\u5217\u5316\u4e3a\u5bf9\u8c61), parseArray() (\u53cd\u5e8f\u5217\u5316\u4e3a\u6570\u7ec4)\u3002\u901a\u5e38\u5b83\u662f\u7528\u6237\u6700\u5148\u63a5\u89e6\u5230\u7684\u7c7b\u3002<\/li>\n<li>JSONObject.java: \u7ee7\u627f\u81eajava.util.HashMap\uff0c\u7528\u4e8e\u8868\u793a JSON \u5bf9\u8c61\u7ed3\u6784\uff08 {key: value} \uff09\u3002<\/li>\n<li>JSONArray.java: \u7ee7\u627f\u81eajava.util.ArrayList\uff0c\u7528\u4e8e\u8868\u793a JSON \u6570\u7ec4\u7ed3\u6784 ( [value1, value2] )\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>com.alibaba.fastjson.serializer (\u5e8f\u5217\u5316\u6a21\u5757)<\/strong><\/p>\n<p>\u6b64\u6a21\u5757\u8d1f\u8d23\u5c06 Java \u5bf9\u8c61\u8f6c\u6362\u4e3a JSON \u683c\u5f0f\u7684\u5b57\u7b26\u4e32<\/p>\n<ul>\n<li>\u5173\u952e\u7c7b :<\/li>\n<li>\n<ul>\n<li>JSONSerializer.java: \u5e8f\u5217\u5316\u7684\u6838\u5fc3\u8c03\u5ea6\u5668\u3002\u5b83\u7ef4\u62a4\u4e86\u5e8f\u5217\u5316\u7684\u4e0a\u4e0b\u6587\u4fe1\u606f\uff0c\u5982\u5bf9\u8c61\u5f15\u7528\u3001\u5faa\u73af\u4f9d\u8d56\u68c0\u6d4b\u3001\u7279\u6027\uff08 SerializerFeature \uff09\u5f00\u5173\u7b49\uff0c\u5e76\u9a71\u52a8\u6574\u4e2a\u5e8f\u5217\u5316\u8fc7\u7a0b\u3002<\/li>\n<li>SerializeWriter.java: \u4e00\u4e2a\u9ad8\u5ea6\u4f18\u5316\u7684 Writer \u5b9e\u73b0\uff0c\u4e13\u95e8\u7528\u4e8e\u751f\u6210 JSON \u5b57\u7b26\u4e32\u3002\u5b83\u5185\u90e8\u4f7f\u7528 char[] \u6570\u7ec4\u6765\u62fc\u63a5\u5b57\u7b26\u4e32\uff0c\u907f\u514d\u4e86 String \u7684\u4e0d\u53ef\u53d8\u6027\u5e26\u6765\u7684\u6027\u80fd\u635f\u8017\uff0c<strong>\u662f Fastjson \u9ad8\u6027\u80fd\u5199\u5165\u7684\u5173\u952e<\/strong>\u3002<\/li>\n<li>JavaBeanSerializer.java: \u9ed8\u8ba4\u7684 JavaBean \u5e8f\u5217\u5316\u5668\u3002\u5728\u672a\u542f\u7528 ASM \u4f18\u5316\u65f6\uff0c\u5b83\u901a\u8fc7<strong>\u53cd\u5c04\u83b7\u53d6\u5bf9\u8c61\u7684\u5c5e\u6027<\/strong>\uff08 getter \u65b9\u6cd5\uff09\u5e76\u5c06\u5176\u5e8f\u5217\u5316\u3002<\/li>\n<li>ASMSerializerFactory.java: \u6027\u80fd\u4f18\u5316\u7684\u6838\u5fc3 \u3002\u5b83\u4f7f\u7528 ASM \u5b57\u8282\u7801\u6280\u672f\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u5e8f\u5217\u5316\u5668\u7c7b\uff0c\u8fd9\u4e9b\u7c7b\u76f4\u63a5\u8c03\u7528 getter \u65b9\u6cd5\u5e76\u64cd\u4f5cSerializeWriter\uff0c\u907f\u514d\u4e86\u53cd\u5c04\u7684\u6027\u80fd\u5f00\u9500\u3002<\/li>\n<li>ObjectSerializer.java: \u5e8f\u5217\u5316\u5668\u63a5\u53e3\u3002\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u5b9e\u73b0\u6b64\u63a5\u53e3\u6765\u4e3a\u7279\u5b9a\u7c7b\u578b\u63d0\u4f9b\u81ea\u5b9a\u4e49\u7684\u5e8f\u5217\u5316\u903b\u8f91\u3002<\/li>\n<li>SerializeConfig.java: \u5e8f\u5217\u5316\u914d\u7f6e\u7c7b\u3002\u5b83\u7ef4\u62a4\u4e86 Java \u7c7b\u578b\u5230\u00a0ObjectSerializer\u00a0\u7684\u7f13\u5b58\u3002\u00a0SerializeConfig.getGlobalInstance()\u00a0\u63d0\u4f9b\u4e86\u5168\u5c40\u552f\u4e00\u7684\u914d\u7f6e\u5b9e\u4f8b\u3002<\/li>\n<li>SerializerFeature.java: \u5e8f\u5217\u5316\u7279\u6027\u679a\u4e3e\u3002\u5b9a\u4e49\u4e86\u5404\u79cd\u5e8f\u5217\u5316\u884c\u4e3a\u7684\u5f00\u5173\uff0c\u4f8b\u5982 WriteMapNullValue (\u8f93\u51fa null \u503c\u7684\u5b57\u6bb5)\u3001\u00a0DisableCircularReferenceDetect\u00a0(\u7981\u7528\u5faa\u73af\u5f15\u7528\u68c0\u6d4b) \u7b49\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>com.alibaba.fastjson.parser (\u53cd\u5e8f\u5217\u5316\u6a21\u5757)<\/strong><\/p>\n<p>\u6b64\u6a21\u5757\u8d1f\u8d23\u5c06 JSON \u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u89e3\u6790\u4e3a Java \u5bf9\u8c61\u3002<\/p>\n<ul>\n<li>\u5173\u952e\u7c7b :<\/li>\n<li>\n<ul>\n<li>DefaultJSONParser.java: \u53cd\u5e8f\u5217\u5316\u7684\u6838\u5fc3\u8c03\u5ea6\u5668\u3002\u5b83\u8d1f\u8d23\u89e3\u6790 JSON \u5b57\u7b26\u4e32\u7684\u6574\u4e2a\u8fc7\u7a0b\uff0c\u7ba1\u7406\u00a0JSONLexer\u8fdb\u884c\u8bcd\u6cd5\u5206\u6790\uff0c\u5e76\u6839\u636e Token (\u5982 { , } , [ , ] , string , number \u7b49)\u6784\u5efa Java \u5bf9\u8c61\u3002<\/li>\n<li>JSONLexer.java \/ JSONLexerBase.java: JSON \u8bcd\u6cd5\u5206\u6790\u5668\u3002\u5b83\u8d1f\u8d23\u626b\u63cf\u8f93\u5165\u7684 JSON \u5b57\u7b26\u4e32\uff0c\u5c06\u5176\u5207\u5272\u6210\u4e00\u4e2a\u4e2a\u6709\u610f\u4e49\u7684 Token \uff0c\u4f9b DefaultJSONParser \u4f7f\u7528\u3002<\/li>\n<li>JavaBeanDeserializer.java: \u9ed8\u8ba4\u7684 JavaBean \u53cd\u5e8f\u5217\u5316\u5668\u3002\u5728\u672a\u542f\u7528 ASM \u4f18\u5316\u65f6\uff0c\u5b83<strong>\u901a\u8fc7\u53cd\u5c04\u521b\u5efa\u5bf9\u8c61\u5b9e\u4f8b\u5e76\u8bbe\u7f6e\u5176\u5c5e\u6027\u503c\u3002<\/strong><\/li>\n<li>ASMDeserializerFactory.java: \u4e0e\u5e8f\u5217\u5316\u7c7b\u4f3c\uff0c\u5b83<strong>\u52a8\u6001\u751f\u6210\u53cd\u5e8f\u5217\u5316\u5668\u5b57\u8282\u7801<\/strong>\uff0c\u76f4\u63a5\u8c03\u7528 setter \u65b9\u6cd5\u6216\u76f4\u63a5\u5bf9\u5b57\u6bb5\u8d4b\u503c\uff0c\u907f\u514d\u4e86\u53cd\u5c04\u3002<\/li>\n<li>ObjectDeserializer.java: \u53cd\u5e8f\u5217\u5316\u5668\u63a5\u53e3\u3002\u7528\u6237\u53ef\u4ee5\u5b9e\u73b0\u6b64\u63a5\u53e3\u6765\u81ea\u5b9a\u4e49\u7279\u5b9a\u7c7b\u578b\u7684\u53cd\u5e8f\u5217\u5316\u903b\u8f91\u3002<\/li>\n<li>ParserConfig.java: \u53cd\u5e8f\u5217\u5316\u914d\u7f6e\u7c7b\u3002\u7ef4\u62a4\u4e86 Java \u7c7b\u578b\u5230 ObjectDeserializer \u7f13\u5b58\uff0c\u5e76\u8d1f\u8d23\u7ba1\u7406 ASM \u751f\u6210\u7684\u7c7b\u7684\u52a0\u8f7d\u3002<\/li>\n<li>Feature.java: \u53cd\u5e8f\u5217\u5316\u7279\u6027\u679a\u4e3e\uff0c\u7528\u4e8e\u63a7\u5236\u89e3\u6790\u884c\u4e3a\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>com.alibaba.fastjson.annotation (\u6ce8\u89e3\u6a21\u5757)<\/strong><\/p>\n<p>\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u6ce8\u89e3\uff0c\u5141\u8bb8\u7528\u6237\u901a\u8fc7\u58f0\u660e\u5f0f\u7684\u65b9\u5f0f\u7cbe\u7ec6\u5730\u63a7\u5236\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u7684\u884c\u4e3a\u3002<\/p>\n<ul>\n<li>\u5173\u952e\u6ce8\u89e3 :<\/li>\n<li>\n<ul>\n<li>@JSONField: \u6700\u6838\u5fc3\u7684\u6ce8\u89e3\uff0c\u53ef\u7528\u4e8e\u5b57\u6bb5\u6216\u65b9\u6cd5\u4e0a\uff0c\u7528\u4e8e\u81ea\u5b9a\u4e49\u5b57\u6bb5\u540d\u3001\u683c\u5f0f\u5316\u3001\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\u987a\u5e8f\u3001\u662f\u5426\u5305\u542b\u7b49\u3002<\/li>\n<li>@JSONType: \u53ef\u7528\u4e8e\u7c7b\u4e0a\uff0c\u7528\u4e8e\u914d\u7f6e\u8be5\u7c7b\u7684\u5e8f\u5217\u5316\u5668\u3001\u53cd\u5e8f\u5217\u5316\u5668\u3001\u7279\u6027\u5f00\u5173\u7b49\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>3.2 \u9879\u76ee\u7ed3\u6784\u5c0f\u7ed3<\/h3>\n<p>Fastjson \u6846\u67b6\u5728\u67b6\u6784\u8bbe\u8ba1\u4f53\u73b0\u4e86\u201c\u5173\u6ce8\u70b9\u5206\u79bb\u201d\u7684\u539f\u5219\uff0c\u5c06\u5e8f\u5217\u5316\u3001\u53cd\u5e8f\u5217\u5316\u3001API\u3001\u5de5\u5177\u7c7b\u7b49\u6e05\u6670\u5730\u5212\u5206\u5230\u4e0d\u540c\u7684\u6a21\u5757\u4e2d\u3002\u6574\u4e2a\u6846\u67b6\u5177\u6709\u9ad8\u5ea6\u7684\u53ef\u6269\u5c55\u6027\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u00a0ObjectSerializer\u00a0\/\u00a0ObjectDeserializer\u63a5\u53e3\u548c\u4e30\u5bcc\u7684\u6ce8\u89e3\u6765\u6ee1\u8db3\u5404\u79cd\u590d\u6742\u7684\u5b9a\u5236\u5316\u9700\u6c42\u3002<\/p>\n<h2>\u56db\u3001\u6838\u5fc3\u6e90\u7801\u5206\u6790<\/h2>\n<p>\u4e3a\u4e86\u66f4\u76f4\u89c2\u8bf4\u660e\u6846\u67b6\u5b9e\u73b0\u539f\u7406\uff0c\u672c\u6587\u5bf9\u90e8\u5206\u5c55\u793a\u7684\u6e90\u4ee3\u7801\u8fdb\u884c\u4e86\u5220\u51cf\uff0c\u6709\u4e9b\u4f7f\u7528\u4e86\u4f2a\u4ee3\u7801\uff0c\u5982\u9700\u4e86\u89e3\u66f4\u591a\u5b9e\u73b0\u7ec6\u8282\u8bf7\u8bfb\u8005\u9605\u8bfb\u9879\u76ee\u6e90\u7801(<a href=\"https:\/\/link.segmentfault.com\/?enc=01lypsQIxaa8tpZ%2FixmmjA%3D%3D.x3Ckwgcs2JlkAv84CpLVFSeIF6afp6ZxzH10wbomBPik1mXbv0F9DkquzixdiZFT\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/github.com\/alibaba\/fastjson<\/a>)<\/p>\n<p>\u6574\u4f53\u4e0aFastjson\u901a\u8fc7\u7edf\u4e00\u7684\u95e8\u9762API\uff08JSON.toJSONString\/parseObject\uff09\u8c03\u7528\u6838\u5fc3\u63a7\u5236\u5668\uff08JSONSerializer\/DefaultJSONParser\uff09\uff0c\u5229\u7528<strong>ASM\u5b57\u8282\u7801\u751f\u6210<\/strong>\u6216<strong>\u53cd\u5c04\u673a\u5236<\/strong>\uff0c\u914d\u5408SerializeWriter\/JSONLexer\u8fdb\u884c\u9ad8\u6548\u7684Java\u5bf9\u8c61\u4e0eJSON\u5b57\u7b26\u4e32\u95f4<strong>\u53cc\u5411\u8f6c\u6362<\/strong>\uff0c\u540c\u65f6\u63d0\u4f9b<strong>\u914d\u7f6e\u7f13\u5b58\u3001\u5faa\u73af\u5f15\u7528\u68c0\u6d4b<\/strong>\u548c<strong>AutoType\u5b89\u5168\u9632\u62a4<\/strong>\u7b49\u4f18\u5316\u673a\u5236\u3002\u4e0b\u56fe\u4e3a\u6846\u67b6\u5904\u7406\u6570\u636e\u6d41\uff1a<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"210\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdmJzi\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p>\u6570\u636e\u6d41<\/p>\n<h3>4.1 \u5e8f\u5217\u5316\u539f\u7406\u4ecb\u7ecd<\/h3>\n<p>\u5e8f\u5217\u5316\u6b65\u9aa4\u4e3b\u8981\u5305\u62ec\uff1a\u5e8f\u5217\u5316\u5668\u67e5\u627e\u2192JavaBean\u5b57\u6bb5\u89e3\u6790\u2192\u5b57\u6bb5\u503c\u8f6c\u6362\u548cJSON\u5b57\u7b26\u4e32\u6784\u5efa\u7b49\u8fc7\u7a0b\u3002\u4e0b\u56fe\u4e3a\u5e8f\u5217\u5316\u5904\u7406\u65f6\u5e8f\u56fe\uff1a<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"739\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdmJzj\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p>\u5e8f\u5217\u5316\u65f6\u5e8f\u56fe<\/p>\n<p><strong>\u5e8f\u5217\u5316\u5165\u53e3\u4e0e\u521d\u59cb\u5316<\/strong><\/p>\n<p>\u4f7f\u7528JSON.toJSONString()\u5165\u53e3\uff0c\u5c06person\u5bf9\u8c61\u8f6c\u6362\u4e3aJSON\u5b57\u7b26\u4e32\u3002<\/p>\n<pre><code>Person\u00a0person =\u00a0new\u00a0Person();\nString\u00a0json =\u00a0JSON.toJSONString(person);\n<\/code><\/pre>\n<p>\u7528\u6237\u8c03\u7528toJSONString\u65b9\u6cd5\u8fdb\u884c\u5bf9\u8c61\u5e8f\u5217\u5316\u64cd\u4f5c\uff0cJSON.java\u5305\u542b\u4e86\u591a\u4e2atoJSONString\u91cd\u8f7d\u65b9\u6cd5\uff0c\u5171\u540c\u5b8c\u6210\u6838\u5fc3\u7c7b\u521d\u59cb\u5316\uff1aSerializeConfig\uff0cSerializeWriter\uff0cJSONSerializer\u3002<\/p>\n<pre><code>\/\/\u7528\u6237\u4e0d\u6307\u5b9aSerializeConfig,\u9ed8\u8ba4\u79c1\u6709\u5168\u5c40\u914d\u7f6e\npublic\u00a0static\u00a0String\u00a0toJSONString(Object\u00a0object, SerializeFilter[] filters,\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 SerializerFeature... features) {\n\u00a0 \u00a0return\u00a0toJSONString(object,\u00a0SerializeConfig.globalInstance, filters,\u00a0null,\u00a0DEFAULT_GENERATE_FEATURE, features);\n}\n\n\npublic\u00a0static\u00a0String\u00a0toJSONString(Object\u00a0object,\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 SerializeConfig config,\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 SerializeFilter[] filters,\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0String\u00a0dateFormat,\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 int defaultFeatures,\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 SerializerFeature... features) {\n\u00a0 \u00a0\u00a0SerializeWriter\u00a0out =\u00a0new\u00a0SerializeWriter((Writer)\u00a0null, defaultFeatures, features);\n\u00a0 \u00a0\u00a0try\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0JSONSerializer serializer =\u00a0new\u00a0JSONSerializer(out);\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/\u7701\u7565\u5176\u4ed6\u4ee3\u7801...\n\u00a0 \u00a0 \u00a0 \u00a0 serializer.write(object); \u00a0\/\/ \u6838\u5fc3\u5e8f\u5217\u5316\u8c03\u7528\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0out.toString();\n\u00a0 \u00a0 }\u00a0finally\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 out.close();\n\u00a0 \u00a0 }\n}\n<\/code><\/pre>\n<p><strong>\u5e8f\u5217\u5316\u63a7\u5236\u6d41\u7a0b<\/strong><\/p>\n<p><strong>JSONSerializer.write()\u6838\u5fc3\u903b\u8f91<\/strong><\/p>\n<p>write\u65b9\u6cd5\u7684\u903b\u8f91\u6bd4\u8f83\u7b80\u5355\uff0c\u9996\u5148\u5904\u7406null\u503c\uff0c\u7136\u540e\u6839\u636e\u7c7b\u578b\u67e5\u627e\u5e8f\u5217\u5668(ObjectSerializer)\uff0c\u6700\u540e\u5c06\u5e8f\u5217\u5316\u903b\u8f91\u59d4\u6d3e\u7ed9\u5e8f\u5217\u5316\u5668\u5904\u7406\u3002<\/p>\n<pre><code>public\u00a0final\u00a0void\u00a0write(Object\u00a0object) {\n\u00a0 \u00a0\u00a0\/\/\u5982\u4f55\u5e8f\u5217\u5316\u5bf9\u8c61\u4e3anull\uff0c\u76f4\u63a5\u5199\u5165&quot;null&quot;\u5b57\u7b26\u4e32\n\u00a0 \u00a0\u00a0if\u00a0(object\u00a0==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 out.writeNull();\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return;\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0Class&lt;?&gt; clazz =\u00a0object.getClass();\n\u00a0 \u00a0\u00a0ObjectSerializer\u00a0writer =\u00a0getObjectWriter(clazz); \u00a0\/\/ \u7c7b\u578b\u8bc6\u522b\u4e0e\u5e8f\u5217\u5316\u5668\u9009\u62e9\n\n\n\u00a0 \u00a0\u00a0try\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 writer.write(this,\u00a0object,\u00a0null,\u00a0null,\u00a00); \u00a0\/\/ \u59d4\u6258\u7ed9\u5177\u4f53\u5e8f\u5217\u5316\u5668\n\u00a0 \u00a0 }\u00a0catch\u00a0(IOException\u00a0e) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0new\u00a0JSONException(e.getMessage(), e);\n\u00a0 \u00a0 }\n}\n<\/code><\/pre>\n<p><strong>\u7c7b\u578b\u8bc6\u522b\u4e0e\u5e8f\u5217\u5316\u5668\u7b56\u7565<\/strong><\/p>\n<p>\u6846\u67b6\u91c7\u7528\u7b56\u7565\u5316\u6a21\u5f0f\u5c06\u4e0d\u540c\u7c7b\u578b\u5e8f\u5217\u5316\u903b\u8f91\u5c01\u88c5\u6210\u4e0d\u540c\u7684\u5e8f\u5217\u5316\u5668\uff1a<\/p>\n<ul>\n<li>\u57fa\u7840\u7c7b\u578b : \u4f7f\u7528\u4e13\u95e8\u7684Codec\uff08\u5982StringCodec\u3001IntegerCodec\uff09<\/li>\n<li>\u96c6\u5408\u7c7b\u578b : \u4f7f\u7528ListSerializer\u3001MapSerializer\u7b49<\/li>\n<li>JavaBean : \u4f7f\u7528JavaBeanSerializer\u6216ASM\u52a8\u6001\u751f\u6210\u7684\u5e8f\u5217\u5316\u5668<\/li>\n<li>\u679a\u4e3e\u7c7b\u578b : \u4f7f\u7528EnumSerializer<\/li>\n<\/ul>\n<p>SerializeConfig.getObjectWriter\u65b9\u6cd5\u8d1f\u8d23\u5e8f\u5217\u5316\u5668\u67e5\u627e\u5de5\u4f5c\uff1a<\/p>\n<pre><code>\n\npublic\u00a0ObjectSerializer getObjectWriter(Class&lt;?&gt; clazz, boolean create) {\n\u00a0 \u00a0\u00a0\/\/ \u7b2c\u4e00\u6b65\uff1a\u7f13\u5b58\u67e5\u627e\n\u00a0 \u00a0 ObjectSerializer writer =\u00a0get(clazz);\n\u00a0 \u00a0\u00a0if\u00a0(writer !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0writer;\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0\/\/ \u7b2c\u4e8c\u6b65\uff1aSPI\u6269\u5c55\u52a0\u8f7d\uff08\u5f53\u524d\u7ebf\u7a0b\u7c7b\u52a0\u8f7d\u5668\uff09\n\u00a0 \u00a0\u00a0try\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0final\u00a0ClassLoader classLoader = Thread.currentThread().getContextClassLoader();\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0for\u00a0(Object o : ServiceLoader.load(AutowiredObjectSerializer.class, classLoader)) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(!(o instanceof AutowiredObjectSerializer)) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0continue;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 AutowiredObjectSerializer autowired = (AutowiredObjectSerializer) o;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0for\u00a0(Type forType : autowired.getAutowiredFor()) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 put(forType, autowired);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\u00a0catch\u00a0(ClassCastException ex) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ skip\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0 writer =\u00a0get(clazz);\n\u00a0 \u00a0\u00a0if\u00a0(writer ==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u7b2c\u4e09\u6b65\uff1aSPI\u6269\u5c55\u52a0\u8f7d\uff08JSON\u7c7b\u52a0\u8f7d\u5668\uff09\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0final\u00a0ClassLoader classLoader = JSON.class.getClassLoader();\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(classLoader != Thread.currentThread().getContextClassLoader()) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u91cd\u590dSPI\u52a0\u8f7d\u903b\u8f91...\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0\/\/ \u7b2c\u56db\u6b65\uff1a\u6a21\u5757\u6269\u5c55\n\u00a0 \u00a0\u00a0for\u00a0(Module module : modules) {\n\u00a0 \u00a0 \u00a0 \u00a0 writer = module.createSerializer(this, clazz);\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(writer !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 put(clazz, writer);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0writer;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0\/\/ \u7b2c\u4e94\u6b65\uff1a\u5185\u7f6e\u7c7b\u578b\u5339\u914d\n\u00a0 \u00a0\u00a0if\u00a0(writer ==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 String className = clazz.getName();\n\u00a0 \u00a0 \u00a0 \u00a0 Class&lt;?&gt; superClass;\n\n\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(Map.class.isAssignableFrom(clazz)) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 put(clazz, writer = MapSerializer.instance);\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(List.class.isAssignableFrom(clazz)) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 put(clazz, writer = ListSerializer.instance);\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(Collection.class.isAssignableFrom(clazz)) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 put(clazz, writer = CollectionCodec.instance);\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(Date.class.isAssignableFrom(clazz)) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 put(clazz, writer = DateCodec.instance);\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(clazz.isEnum()) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u679a\u4e3e\u5904\u7406\u903b\u8f91\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(clazz.isArray()) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u6570\u7ec4\u5904\u7406\u903b\u8f91\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u7b2c\u516d\u6b65\uff1aJavaBean\u5e8f\u5217\u5316\u5668\u521b\u5efa\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(create) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 writer = createJavaBeanSerializer(clazz);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 put(clazz, writer);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0return\u00a0writer;\n}<\/code><\/pre>\n<p><strong>JavaBean\u5e8f\u5217\u5316\u5904\u7406<\/strong><\/p>\n<p>JavaBeanSerializer\u7684write\u65b9\u6cd5\u5b9e\u73b0\u4e86Java\u5bf9\u8c61\u5e8f\u5217\u5316\u5904\u7406\u6838\u5fc3\u903b\u8f91\uff1a<\/p>\n<p><strong>\u65b9\u6cd5\u7b7e\u540d\u5206\u6790\uff1a<\/strong><\/p>\n<pre><code>protected\u00a0void\u00a0write(JSONSerializer serializer,\u00a0\/\/JSON\u5e8f\u5217\u5316\u5668\uff0c\u63d0\u4f9b\u5e8f\u5217\u5316\u4e0a\u4e0b\u6587\u548c\u8f93\u51fa\u6d41\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Object\u00a0object,\u00a0\/\/\u5f85\u5e8f\u5217\u5316\u7684Java\u5bf9\u8c61\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Object\u00a0fieldName,\u00a0\/\/\u5b57\u6bb5\u540d\u79f0\uff0c\u7528\u4e8e\u4e0a\u4e0b\u6587\u8ffd\u8e2a\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Type\u00a0fieldType,\u00a0\/\/\u5b57\u6bb5\u7c7b\u578b\u4fe1\u606f\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 int features,\u00a0\/\/\u5e8f\u5217\u5316\u7279\u6027\u6807\u5fd7\u4f4d\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0boolean\u00a0unwrapped\u00a0\/\/\u662f\u5426\u5c55\u5f00\u5305\u88c5\uff0c\u7528\u4e8e\u5d4c\u5957\u5bf9\u8c61\u5904\u7406\n\u00a0 \u00a0 ) throws\u00a0IOException\n<\/code><\/pre>\n<p><strong>\u5e8f\u5217\u5316\u6d41\u7a0b\u6982\u89c8\uff1a<\/strong><\/p>\n<pre><code>\/\/ 1. \u7a7a\u503c\u68c0\u67e5\u548c\u5faa\u73af\u5f15\u7528\u5904\u7406\nif\u00a0(object\u00a0==\u00a0null) {\n\u00a0 \u00a0\u00a0out.writeNull();\n\u00a0 \u00a0\u00a0return;\n}\n\n\nif\u00a0(writeReference(serializer,\u00a0object, features)) {\n\u00a0 \u00a0\u00a0return;\n}\n\n\n\/\/ 2. \u5b57\u6bb5\u5e8f\u5217\u5316\u5668\u9009\u62e9\nfinal\u00a0FieldSerializer[] getters;\nif\u00a0(out.sortField) {\n\u00a0 \u00a0 getters =\u00a0this.sortedGetters;\n}\u00a0else\u00a0{\n\u00a0 \u00a0 getters =\u00a0this.getters;\n}\n\n\n\/\/ 3. \u4e0a\u4e0b\u6587\u8bbe\u7f6e\u548c\u683c\u5f0f\u5224\u65ad\nSerialContext parent = serializer.context;\nif\u00a0(!this.beanInfo.beanType.isEnum()) {\n\u00a0 \u00a0 serializer.setContext(parent,\u00a0object, fieldName,\u00a0this.beanInfo.features, features);\n}\n\n\n\/\/ 4.\u904d\u5386\u5c5e\u6027\u5e8f\u5217\u5316\u5668\uff0c\u5b8c\u6210\u5c5e\u6027\u5e8f\u5217\u5316\nfor\u00a0(int i =\u00a00; i &lt; getters.length; ++i) {\n\u00a0 \u00a0 FieldSerializer fieldSerializer = getters[i];\n\u00a0 \u00a0\u00a0\/\/ \u83b7\u53d6\u5c5e\u6027\u503c\n\u00a0 \u00a0 Object propertyValue =\u00a0this.processValue(serializer, fieldSerializer.fieldContext,\u00a0object, fieldInfoName,\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 propertyValue, features);\n\u00a0 \u00a0\u00a0\/\/ \u5199\u5165\u5c5e\u6027\u503c \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\n\u00a0 \u00a0 fieldSerializer.writeValue(serializer, propertyValue);\n}\n<\/code><\/pre>\n<p><strong>\u5faa\u73af\u5f15\u7528\u68c0\u6d4b\uff1a<\/strong><\/p>\n<p>JavaBeanSerializerwriteReference\u00a0\u65b9\u6cd5\u6267\u884c\u5faa\u73af\u5f15\u7528\u68c0\u6d4b\uff0cFastjson\u4f7f\u7528&dollar;ref\u5360\u4f4d\u7b26\u5904\u7406\u5faa\u73af\u5f15\u7528\u95ee\u9898\uff0c\u9632\u6b62\u5bf9\u8c61\u5faa\u73af\u5f15\u7528\u9020\u6210\u89e3\u6790\u67e5\u8be2\u6808\u6ea2\u51fa\u3002<\/p>\n<pre><code>public\u00a0boolean\u00a0writeReference(JSONSerializer serializer,\u00a0Object\u00a0object, int fieldFeatures) {\n\u00a0 \u00a0\u00a0SerialContext\u00a0context = serializer.context;\n\u00a0 \u00a0 int mask =\u00a0SerializerFeature.DisableCircularReferenceDetect.mask;\n\n\n\u00a0 \u00a0\u00a0\/\/ \u68c0\u67e5\u662f\u5426\u7981\u7528\u5faa\u73af\u5f15\u7528\u68c0\u6d4b\n\u00a0 \u00a0\u00a0if\u00a0(context ==\u00a0null\u00a0|| (context.features\u00a0&amp; mask) !=\u00a00\u00a0|| (fieldFeatures &amp; mask) !=\u00a00) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0false;\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0\/\/ \u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u5df2\u5b58\u5728\u4e8e\u5f15\u7528\u8868\u4e2d\n\u00a0 \u00a0\u00a0if\u00a0(serializer.references\u00a0!=\u00a0null\u00a0&amp;&amp; serializer.references.containsKey(object)) {\n\u00a0 \u00a0 \u00a0 \u00a0 serializer.writeReference(object); \u00a0\/\/ \u5199\u5165\u5f15\u7528\u6807\u8bb0\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0true;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0return\u00a0false;\n}\n<\/code><\/pre>\n<p><strong>\u4e0a\u4e0b\u6587\u7ba1\u7406\u4e0e\u5f15\u7528\u8ffd\u8e2a\uff1a<\/strong><\/p>\n<p>\u5e8f\u5217\u5316\u91c7\u7528DFS(\u6df1\u5ea6\u4f18\u5148)\u7b97\u6cd5\u904d\u5386\u5bf9\u8c61\u6811\uff0c\u4f7f\u7528\u00a0IdentityHashMap\/&lt;Object, SerialContext&gt; references\u00a0\u6765\u8ffd\u8e2a\u5bf9\u8c61\u5f15\u7528\uff1a<\/p>\n<ul>\n<li>setContext: \u5efa\u7acb\u5e8f\u5217\u5316\u4e0a\u4e0b\u6587\uff0c\u8bb0\u5f55\u5bf9\u8c61\u5c42\u6b21\u5173\u7cfb<\/li>\n<li>containsReference: \u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u5df2\u88ab\u5e8f\u5217\u5316<\/li>\n<li>popContext: \u5e8f\u5217\u5316\u5b8c\u6210\u540e\u6e05\u7406\u4e0a\u4e0b\u6587<\/li>\n<\/ul>\n<p>&lt;!&#8212;-&gt;<\/p>\n<pre><code>protected\u00a0IdentityHashMap&lt;Object,\u00a0SerialContext&gt; references \u00a0=\u00a0null;\nprotected\u00a0SerialContext\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 context;\n\/\/\u4f7f\u7528\u94fe\u8868\u5efa\u7acb\u5e8f\u5217\u5316\u4e0a\u4e0b\u6587\u5f15\u7528\u94fe\uff0c\u8bb0\u5f55\u5bf9\u8c61\u5c42\u6b21\u5173\u7cfb\npublic\u00a0void\u00a0setContext(SerialContext parent,\u00a0Object\u00a0object,\u00a0Object\u00a0fieldName, int features, int fieldFeatures) {\n\u00a0 \u00a0\u00a0if\u00a0(out.disableCircularReferenceDetect) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\/\/\u6784\u5efa\u5f53\u524d\u4e0a\u4e0b\u6587\u5230parent\u4e0a\u4e0b\u6587\u5f15\u7528\u94fe\n\u00a0 \u00a0\u00a0this.context\u00a0=\u00a0new\u00a0SerialContext(parent,\u00a0object, fieldName, features, fieldFeatures);\n\u00a0 \u00a0\u00a0if\u00a0(references ==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 references =\u00a0new\u00a0IdentityHashMap&lt;Object,\u00a0SerialContext&gt;();\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0this.references.put(object, context);\n}\n\/\/\u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u5df2\u88ab\u5e8f\u5217\u5316,\u9632\u6b62\u91cd\u590d\u5e8f\u5217\u5316\npublic\u00a0boolean\u00a0containsReference(Object\u00a0value) {\n\u00a0 \u00a0\u00a0if\u00a0(references ==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0false;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0SerialContext\u00a0refContext = references.get(value);\n\u00a0 \u00a0\u00a0if\u00a0(refContext ==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0false;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0if\u00a0(value ==\u00a0Collections.emptyMap()) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0false;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0Object\u00a0fieldName = refContext.fieldName;\n\u00a0 \u00a0\u00a0return\u00a0fieldName ==\u00a0null\u00a0|| fieldName\u00a0instanceof\u00a0Integer\u00a0|| fieldName\u00a0instanceof\u00a0String;\n}\n\/\/\u6e05\u7406\u4e0a\u4e0b\u6587\uff0c\u5c06\u5f53\u524d\u5e8f\u5217\u5316\u4e0a\u4e0b\u6587\u6307\u5411\u7236\u4eb2\u8282\u70b9\npublic\u00a0void\u00a0popContext() {\n\u00a0 \u00a0\u00a0if\u00a0(context !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0this.context\u00a0=\u00a0this.context.parent;\n\u00a0 \u00a0 }\n}\n<\/code><\/pre>\n<p><strong>\u5b57\u6bb5\u503c\u8f6c\u6362\u4e0e\u5e8f\u5217\u5316<\/strong><\/p>\n<p><strong>FieldSerializer.writeValue()\u6838\u5fc3\u903b\u8f91<\/strong><\/p>\n<p>FieldSerializer\u00a0\u7684writeValue\u65b9\u6cd5\u5b9e\u73b0\u4e86\u5b57\u6bb5\u503c\u7684\u5e8f\u5217\u5316\u64cd\u4f5c\uff1a<\/p>\n<pre><code>public\u00a0void\u00a0writeValue(JSONSerializer serializer, Object propertyValue)\u00a0throws\u00a0Exception {\n\u00a0 \u00a0\u00a0\/\/ \u8fd0\u884c\u65f6\u7c7b\u578b\u8bc6\u522b\n\u00a0 \u00a0 Class&lt;?&gt; runtimeFieldClass = propertyValue !=\u00a0null\u00a0?\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 propertyValue.getClass() :\u00a0this.fieldInfo.fieldClass;\n\n\n\u00a0 \u00a0\u00a0\/\/ \u67e5\u627e\u5c5e\u6027\u7c7b\u578b\u5bf9\u5e94\u7684\u5e8f\u5217\u5316\u5668\n\u00a0 \u00a0\u00a0ObjectSerializer\u00a0fieldSerializer\u00a0=\u00a0serializer.getObjectWriter(runtimeFieldClass);\n\n\n\u00a0 \u00a0\u00a0\/\/ \u5904\u7406\u7279\u6b8a\u683c\u5f0f\u548c\u6ce8\u89e3\n\u00a0 \u00a0\u00a0if\u00a0(format !=\u00a0null\u00a0&amp;&amp; !(fieldSerializer\u00a0instanceof\u00a0DoubleSerializer)) {\n\u00a0 \u00a0 \u00a0 \u00a0 serializer.writeWithFormat(propertyValue, format);\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return;\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0\/\/ \u59d4\u6258\u7ed9\u5177\u4f53\u5e8f\u5217\u5316\u5668\u5904\u7406\n\u00a0 \u00a0 fieldSerializer.write(serializer, propertyValue, fieldInfo.name,\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0fieldInfo.fieldType, fieldFeatures);\n}\n<\/code><\/pre>\n<p><strong>\u4e0d\u540c\u7c7b\u578b\u7684\u5e8f\u5217\u5316\u7b56\u7565<\/strong><\/p>\n<p>\u57fa\u7840\u7c7b\u578b\u5e8f\u5217\u5316 \uff1a<\/p>\n<ul>\n<li>\u76f4\u63a5\u8c03\u7528SerializeWriter\u7684\u5bf9\u5e94\u65b9\u6cd5\uff08writeInt\u3001writeString\u7b49\uff09<\/li>\n<\/ul>\n<p>\u590d\u6742\u5bf9\u8c61\u5e8f\u5217\u5316 \uff1a<\/p>\n<ul>\n<li>\u9012\u5f52\u8c03\u7528JSONSerializer.write()\u65b9\u6cd5<\/li>\n<li>\u7ef4\u62a4\u5e8f\u5217\u5316\u4e0a\u4e0b\u6587\u548c\u5f15\u7528\u5173\u7cfb<\/li>\n<li>\u5e94\u7528\u8fc7\u6ee4\u5668\u548c\u7279\u6027\u914d\u7f6e<\/li>\n<\/ul>\n<p>ASM\u5b9a\u5236\u5316\u5e8f\u5217\u5316\u5668\u52a0\u901f\uff0c\u4e0b\u6587\u4f1a\u8fdb\u884c\u8be6\u7ec6\u8bb2\u89e3\u3002<\/p>\n<ul>\n<li>\u4e3a\u5e8f\u5217\u5316\u7684\u7c7b\u52a8\u6001\u751f\u6210\u5b9a\u5236\u5316\u7684\u5e8f\u5217\u5316\u5668\uff0c\u907f\u514d\u53cd\u5c04\u8c03\u7528\u5f00\u9500<\/li>\n<\/ul>\n<p><strong>JSON\u5b57\u7b26\u4e32\u6784\u5efa<\/strong><\/p>\n<p>SerializeWriter.java\u91c7\u7528\u7ebf\u7a0b\u672c\u5730\u7f13\u51b2\u673a\u5236\uff0c\u63d0\u4f9b\u9ad8\u6548\u7684\u5b57\u7b26\u4e32\u6784\u5efa\uff1a<\/p>\n<pre><code>\/\/\u7528\u4e8e\u5b58\u50a8\u5b58JSON\u5b57\u7b26\u4e32\nprivate\u00a0final\u00a0static\u00a0ThreadLocal&lt;char[]&gt; bufLocal \u00a0 \u00a0 \u00a0 \u00a0 =\u00a0new\u00a0ThreadLocal&lt;char[]&gt;();\n\/\/\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3aUTF-8\u5b57\u8282\u6570\u7ec4\nprivate\u00a0final\u00a0static\u00a0ThreadLocal&lt;byte[]&gt; bytesBufLocal \u00a0 \u00a0=\u00a0new\u00a0ThreadLocal&lt;byte[]&gt;();\n<\/code><\/pre>\n<ul>\n<li>\u5b57\u7b26\u7f13\u51b2\u533a : \u7ebf\u7a0b\u672c\u5730char[]\u6570\u7ec4\u51cf\u5c11\u5185\u5b58\u5206\u914d\uff0c\u907f\u514d\u9891\u7e41\u521b\u5efa\u4e34\u65f6\u6570\u7ec4\u5bf9\u8c61\u3002<\/li>\n<li>\u52a8\u6001\u6269\u5bb9 : \u6839\u636e\u5185\u5bb9\u957f\u5ea6\u81ea\u52a8\u8c03\u6574\u7f13\u51b2\u533a\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<p>bufLocal\u521d\u59cb\u5316\u521b\u5efa2048\u5b57\u7b26\u7684\u7f13\u51b2\u533a\uff0c\u56de\u6536\u9636\u6bb5\u5f53\u7f13\u51b2\u533a\u5927\u5c0f\u4e0d\u8d85\u8fc7 BUFFER\/_THRESHOLD \uff08128KB\uff09\u65f6\uff0c\u5c06\u5176\u653e\u56deThreadLocal\u7f13\u5b58\uff0c\u8d85\u8fc7\u9608\u503c\u7684\u5927\u7f13\u51b2\u533a\u4e0d\u7f13\u5b58\uff0c\u907f\u514d\u5185\u5b58\u5360\u7528\u8fc7\u5927\u3002<\/p>\n<p>bytesBufLocal\u4e13\u95e8\u7528\u4e8eUTF-8\u7f16\u7801\u8f6c\u6362\u8fc7\u7a0b\uff0c\u521d\u59cb\u7f13\u51b2\u533a\u5927\u5c0f\uff1a8KB\uff081024 * 8\uff09\uff0c\u6839\u636e\u5b57\u7b26\u6570\u91cf\u4f30\u7b97\u6240\u9700\u5b57\u8282\u6570\uff08\u5b57\u7b26\u6570 \u00d7 3\uff09\uff0c\u53ea\u6709\u4e0d\u8d85\u8fc7 BUFFER\/_THRESHOLD \u7684\u7f13\u51b2\u533a\u624d\u4f1a\u88ab\u7f13\u5b58\u3002<\/p>\n<h3>4.2 \u5e8f\u5217\u5316\u5c0f\u7ed3<\/h3>\n<p>Fastjson\u901a\u8fc7JSON.toJSONString()\u95e8\u9762API\u8c03\u7528JSONSerializer\u63a7\u5236\u5668\uff0c\u5229\u7528ASM\u5b57\u8282\u7801\u751f\u6210\u7684\u9ad8\u6027\u80fd\u5e8f\u5217\u5316\u5668\u6216\u53cd\u5c04\u673a\u5236\u904d\u5386Java\u5bf9\u8c61\u5b57\u6bb5\uff0c\u914d\u5408SerializeWriter\u5c06\u5b57\u6bb5\u540d\u548c\u503c\u9010\u6b65\u5199\u5165\u7f13\u51b2\u533a\u6784\u5efaJSON\u5b57\u7b26\u4e32\u3002<\/p>\n<h3>4.3 \u53cd\u5e8f\u5217\u5316\u6d41\u7a0b<\/h3>\n<p>\u867d\u7136\u201c\u5e8f\u5217\u5316\u201d\u4e0e\u201c\u53cd\u5e8f\u5217\u5316\u201d\u5728\u6982\u5ff5\u4e0a\u662f\u5bf9\u5076\u7684(Serialize \u2194 Deserialize)\uff0c\u4f46\u5728\u5b9e\u73b0\u5c42\u9762\u5e76\u4e0d\u4e25\u683c\u5bf9\u5076\uff0c\u53cd\u5e8f\u5217\u5316\u5b9e\u73b0\u660e\u663e\u6bd4\u5e8f\u5217\u5316\u590d\u6742\u3002\u6838\u5fc3\u6b65\u9aa4\u5305\u62ec\uff1a\u53cd\u5e8f\u5217\u5316\u5668\u67e5\u627e\u2192 \u53cd\u5e8f\u5217\u6d41\u7a0b\u63a7\u5236\u2192\u8bcd\u6cd5\u5206\u6790\u5668\uff08Tokenizer\uff09 \u2192 \u5b89\u5168\u68c0\u67e5\u2192\u53cd\u5c04\/ASM \u5b57\u6bb5\u586b\u5145\u7b49\uff0c\u4e0b\u56fe\u4e3a\u5904\u7406\u65f6\u5e8f\u56fe\uff1a<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"949\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdmJzk\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p><strong>\u53cd\u5e8f\u5217\u5316\u5165\u53e3\u4e0e\u53cd\u5e8f\u5217\u5316\u5668\u9009\u62e9<\/strong><\/p>\n<p>\u53cd\u5e8f\u5217\u5316\u4ece\u00a0JSON.java\u7684parseObject\u65b9\u6cd5\u5f00\u59cb\uff1a<\/p>\n<pre><code>\/\/ JSON.java - \u53cd\u5e8f\u5217\u5316\u5165\u53e3\npublic\u00a0static\u00a0&lt;T&gt; T\u00a0parseObject(String text, Class&lt;T&gt; clazz,\u00a0int\u00a0features)\u00a0{\n\u00a0 \u00a0\u00a0if\u00a0(text ==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0null;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0DefaultJSONParser\u00a0parser\u00a0=\u00a0new\u00a0DefaultJSONParser(text, ParserConfig.getGlobalInstance(), features);\n\u00a0 \u00a0\u00a0T\u00a0value\u00a0=\u00a0(T) parser.parseObject(clazz);\n\u00a0 \u00a0 parser.handleResovleTask(value);\n\u00a0 \u00a0 parser.close();\n\u00a0 \u00a0\u00a0return\u00a0value;\n}\n<\/code><\/pre>\n<p><strong>\u67e5\u627e\u53cd\u5e8f\u5217\u5316\u5668<\/strong><\/p>\n<p><strong>\u5728 DefaultJSONParser.java \u4e2d\u9009\u62e9\u5408\u9002\u7684\u53cd\u5e8f\u5217\u5316\u5668\uff1a<\/strong><\/p>\n<pre><code>\/\/ DefaultJSONParser.java - \u53cd\u5e8f\u5217\u5316\u5668\u9009\u62e9\npublic\u00a0&lt;T&gt; T\u00a0parseObject(Type\u00a0type,\u00a0Object\u00a0fieldName) {\n\u00a0 \u00a0 int token = lexer.token();\n\u00a0 \u00a0\u00a0if\u00a0(token ==\u00a0JSONToken.NULL) {\n\u00a0 \u00a0 \u00a0 \u00a0 lexer.nextToken();\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0(T)\u00a0TypeUtils.optionalEmpty(type);\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\/\/\u4ece\u7f13\u5b58\u4e2d\u67e5\u627e\u53cd\u5e8f\u5217\u5316\u5668\n\u00a0 \u00a0\u00a0ObjectDeserializer\u00a0deserializer = config.getDeserializer(type);\n\n\n\u00a0 \u00a0\u00a0try\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(deserializer.getClass() ==\u00a0JavaBeanDeserializer.class) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0(T) ((JavaBeanDeserializer) deserializer).deserialze(this,\u00a0type, fieldName,\u00a00);\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0(T) deserializer.deserialze(this,\u00a0type, fieldName);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\u00a0catch\u00a0(JSONException e) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0e;\n\u00a0 \u00a0 }\u00a0catch\u00a0(Throwable\u00a0e) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0new\u00a0JSONException(e.getMessage(), e);\n\u00a0 \u00a0 }\n}\n<\/code><\/pre>\n<p><strong>ParserConfig.java\u00a0\u8d1f\u8d23\u83b7\u53d6\u5bf9\u5e94\u7c7b\u578b\u7684\u53cd\u5e8f\u5217\u5316\u5668\uff1a<\/strong><\/p>\n<pre><code>\/\/ ParserConfig.java - \u53cd\u5e8f\u5217\u5316\u5668\u83b7\u53d6\npublic\u00a0ObjectDeserializer\u00a0getDeserializer(Type\u00a0type) {\n\u00a0 \u00a0\u00a0ObjectDeserializer\u00a0deserializer =\u00a0this.deserializers.get(type);\n\u00a0 \u00a0\u00a0if\u00a0(deserializer !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0deserializer;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\/\/\u901a\u8fc7Class\u67e5\u627e\n\u00a0 \u00a0\u00a0if\u00a0(type\u00a0instanceof\u00a0Class&lt;?&gt;) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0getDeserializer((Class&lt;?&gt;)\u00a0type,\u00a0type);\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\/\/\u901a\u8fc7\u6cdb\u578b\u53c2\u6570\u67e5\u627e\n\u00a0 \u00a0\u00a0if\u00a0(type\u00a0instanceof\u00a0ParameterizedType) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0Type\u00a0rawType = ((ParameterizedType)\u00a0type).getRawType();\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(rawType\u00a0instanceof\u00a0Class&lt;?&gt;) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0getDeserializer((Class&lt;?&gt;) rawType,\u00a0type);\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0getDeserializer(rawType);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0return\u00a0JavaObjectDeserializer.instance;\n}\n<\/code><\/pre>\n<p><strong>\u53cd\u5e8f\u5217\u5316\u63a7\u5236\u6d41\u7a0b<\/strong><\/p>\n<p>JavaBeanDeserializer.java\u00a0\u7684deserialze\u5b9e\u73b0\u4e86\u53cd\u5e8f\u5217\u5316\u4e3b\u8981\u5904\u7406\u6d41\u7a0b\u3002<\/p>\n<pre><code>\/\/ JavaBeanDeserializer.java - \u7c7b\u578b\u8bc6\u522b\u4e0e\u5b57\u6bb5\u5339\u914d\npublic\u00a0&lt;T&gt; T\u00a0deserialze(DefaultJSONParser parser, Type\u00a0type,\u00a0Object\u00a0fieldName, int features, int[] setFlags) {\n\u00a0 \u00a0\u00a0\/\/ 1.\u7279\u6b8a\u7c7b\u578b\u5feb\u901f\u5904\u7406\n\u00a0 \u00a0\u00a0if\u00a0(type\u00a0==\u00a0JSON.class\u00a0||\u00a0type\u00a0==\u00a0JSONObject.class) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0(T) parser.parse();\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\/\/2.\u521d\u59cb\u5316\u6838\u5fc3\u7ec4\u4ef6\n\u00a0 \u00a0 final\u00a0JSONLexer lexer = parser.lexer;\n\u00a0 \u00a0\u00a0\/\/3.\u53cd\u5e8f\u5217\u5316\u4e0a\u4e0b\u6587\u7ba1\u7406\n\u00a0 \u00a0\u00a0ParseContext\u00a0context = parser.getContext();\n\u00a0 \u00a0\u00a0if\u00a0(object\u00a0!=\u00a0null\u00a0&amp;&amp; context !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0context = context.parent;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0ParseContext\u00a0childContext =\u00a0null;\n\u00a0 \u00a0\u00a0\/\/\u4fdd\u5b58\u89e3\u6790\u540e\u5b57\u6bb5\u503c\n\u00a0 \u00a0\u00a0Map&lt;String,\u00a0Object&gt; fieldValues =\u00a0null;\n\u00a0 \u00a0\u00a0\/\/ JSON\u5173\u952e\u5b57\u5206\u652f\u9884\u5904\u7406\n\u00a0 \u00a0\u00a0if\u00a0(token ==\u00a0JSONToken.RBRACE) {\n\u00a0 \u00a0 \u00a0 \u00a0 lexer.nextToken(JSONToken.COMMA);\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(object\u00a0==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0object\u00a0=\u00a0createInstance(parser,\u00a0type);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0(T)\u00a0object;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\/\/\u5904\u7406\u5176\u4ed6JSON\u5173\u952e\u5b57\n\u00a0 \u00a0 ...\n\n\n\u00a0 \u00a0\u00a0\/\/4.\u5b57\u6bb5\u89e3\u6790\u4e3b\u5faa\u73af\n\u00a0 \u00a0\u00a0for\u00a0(int fieldIndex =\u00a00, notMatchCount =\u00a00;; fieldIndex++) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0boolean\u00a0customDeserializer =\u00a0false;\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/\u8fd9\u662f\u4e00\u4e2a\u6027\u80fd\u4f18\u5316\u7684\u8bbe\u8ba1\uff0c\u901a\u8fc7\u9884\u6392\u5e8f\u548c\u7d22\u5f15\u8bbf\u95ee\u6765\u63d0\u9ad8\u5b57\u6bb5\u5339\u914d\u7684\u6548\u7387\uff0c\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/\u901a\u5e38\u60c5\u51b5\u4e0bJSON\u4e32\u6309\u5b57\u6bb5\u5b9a\u4e49\u987a\u5e8f\u6392\u5217\uff0c\u56e0\u6b64\u80fd\u5feb\u901f\u547d\u4e2d\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(fieldIndex &lt; sortedFieldDeserializers.length\u00a0&amp;&amp; notMatchCount &lt;\u00a016) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fieldDeserializer = sortedFieldDeserializers[fieldIndex];\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fieldInfo = fieldDeserializer.fieldInfo;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fieldClass = fieldInfo.fieldClass;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fieldAnnotation = fieldInfo.getAnnotation();\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(fieldAnnotation !=\u00a0null\u00a0&amp;&amp; fieldDeserializer\u00a0instanceof\u00a0DefaultFieldDeserializer) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 customDeserializer = ((DefaultFieldDeserializer) fieldDeserializer).customDeserilizer;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0}\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Object\u00a0fieldValue =\u00a0null;\n\n\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0if\u00a0(fieldDeserializer !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 char[] name_chars = fieldInfo.name_chars;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/\u6307\u5b9a\u4e86\u81ea\u5b9a\u4e49\u53d1\u5e8f\u5217\u5316\u5668\uff0c\u540e\u7eed\u4f7f\u7528\u81ea\u5b9a\u4e49\u5e8f\u5217\u5316\u5668\u5904\u7406\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(customDeserializer &amp;&amp; lexer.matchField(name_chars)) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchField =\u00a0true;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/\/ \u57fa\u672c\u7c7b\u578b\u5feb\u901f\u8def\u5f84\u5339\u914d\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0}\u00a0else\u00a0if\u00a0(fieldClass == int.class\u00a0|| fieldClass ==\u00a0Integer.class) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/\u8bcd\u6cd5\u5206\u6790,\u89e3\u6790int\u503c\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 int intVal = lexer.scanFieldInt(name_chars);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(intVal ==\u00a00\u00a0&amp;&amp; lexer.matchStat\u00a0==\u00a0JSONLexer.VALUE_NULL) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fieldValue =\u00a0null;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fieldValue = intVal;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(lexer.matchStat\u00a0&gt;\u00a00) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchField =\u00a0true;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 valueParsed =\u00a0true;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(lexer.matchStat\u00a0==\u00a0JSONLexer.NOT_MATCH_NAME) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/\u589e\u52a0\u8ba1\u7b97\uff0c\u8bb0\u5f55\u672a\u547d\u4e2d\u6b21\u6570\u4ee5\u8c03\u6574\u5339\u914d\u7b56\u7565\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 notMatchCount++;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0continue;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\n\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0}\u00a0else\u00a0if(...){\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/\/\u7701\u7565\u5176\u4ed6\u57fa\u7840\u7c7b\u578b\u5904\u7406 \u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0}\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0}\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/\/ \u5feb\u901f\u5339\u914d\u5931\u8d25\uff0c\u52a8\u6001\u626b\u63cf\u5b57\u6bb5\u540d,\u901a\u8fc7\u7b26\u53f7\u8868\u4f18\u5316:\u8fd4\u56de\u7684\u5b57\u7b26\u4e32\u53ef\u80fd\u662f\u7b26\u53f7\u8868\u4e2d\u7684\u7f13\u5b58\u5b9e\u4f8b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0if\u00a0(!matchField) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 key = lexer.scanSymbol(parser.symbolTable);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ $ref \u5f15\u7528\u5904\u7406\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(&quot;$ref&quot;\u00a0== key &amp;&amp; context !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0handleReferenceResolution(lexer, parser, context)\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ @type \u7c7b\u578b\u5904\u7406\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0((typeKey !=\u00a0null\u00a0&amp;&amp; typeKey.equals(key))\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ||\u00a0JSON.DEFAULT_TYPE_KEY\u00a0== key) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/AutoType\u5b89\u5168\u68c0\u67e5\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 config.checkAutoType(typeName, expectClass, lexer.getFeatures());\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0handleTypeNameResolution(lexer, parser, config, beanInfo,\u00a0type, fieldName);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\n\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0}\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0\/\/ 5.\u5982\u679c\u5bf9\u8c61\u4e3a\u7a7a\uff0c\u5219\u521b\u5efa\u5bf9\u8c61\u5b9e\u4f8b\n\u00a0 \u00a0\u00a0if\u00a0(object\u00a0==\u00a0null\u00a0&amp;&amp; fieldInfo ==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0object\u00a0=\u00a0createInstance(parser,\u00a0type);\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(object\u00a0==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0null;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0\/\/6. \u5b57\u6bb5\u503c\u8bbe\u7f6e\n\u00a0 \u00a0\u00a0for\u00a0(Map.Entry&lt;String,\u00a0Object&gt; entry : fieldValues.entrySet()) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0FieldDeserializer\u00a0fieldDeserializer =\u00a0getFieldDeserializer(entry.getKey());\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(fieldDeserializer !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 fieldDeserializer.setValue(object, entry.getValue());\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0}\n\n\n\u00a0 \u00a0\u00a0return\u00a0(T)\u00a0object;\n}\n<\/code><\/pre>\n<p><strong>\u5b57\u7b26\u4e32\u89e3\u6790\u9636\u6bb5\uff08\u8bcd\u6cd5\u5206\u6790\uff09<\/strong><\/p>\n<p>JSONLexerBase\u5185\u90e8\u7ef4\u62a4\u8bcd\u6cd5\u89e3\u6790\u72b6\u6001\u673a\uff0c\u5b9e\u73b0\u8bcd\u6cd5\u5206\u6790\u6838\u5fc3\u903b\u8f91\uff0c\u4e0b\u9762\u5c55\u793a\u4e86Integer\u503c\u7c7b\u578b\u5904\u7406\u6e90\u7801\uff1a<\/p>\n<pre><code>\u00a0 \u00a0\u00a0public\u00a0int scanFieldInt(char[] fieldName) {\n\u00a0 \u00a0 \u00a0 \u00a0 matchStat = UNKNOWN;\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ 1. \u5b57\u6bb5\u540d\u5339\u914d\u9636\u6bb5\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(!charArrayCompare(fieldName)) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchStat = NOT_MATCH_NAME;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a00;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 int offset = fieldName.length;\n\u00a0 \u00a0 \u00a0 \u00a0 char chLocal = charAt(bp + (offset++));\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ 2. \u8d1f\u53f7\u5904\u7406\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0final\u00a0boolean negative = chLocal ==\u00a0'-';\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(negative) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 chLocal = charAt(bp + (offset++));\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ 3. \u6570\u5b57\u89e3\u6790\u6838\u5fc3\u7b97\u6cd5\n\u00a0 \u00a0 \u00a0 \u00a0 int value;\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(chLocal &gt;=\u00a0'0'\u00a0&amp;&amp; chLocal &lt;=\u00a0'9') {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 value = chLocal -\u00a0'0';\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0for\u00a0(;;) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 chLocal = charAt(bp + (offset++));\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(chLocal &gt;=\u00a0'0'\u00a0&amp;&amp; chLocal &lt;=\u00a0'9') {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 value = value *\u00a010\u00a0+ (chLocal -\u00a0'0');\/\/ \u5341\u8fdb\u5236\u7d2f\u52a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(chLocal ==\u00a0'.') {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchStat = NOT_MATCH;\u00a0\/\/ \u62d2\u7edd\u6d6e\u70b9\u6570\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a00;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0break;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/\/ 4. \u6ea2\u51fa\u68c0\u6d4b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(value &lt;\u00a00\u00a0\/\/\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 || offset &gt;\u00a011\u00a0+\u00a03\u00a0+ fieldName.length) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(value != Integer.MIN_VALUE\u00a0\/\/\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 || offset !=\u00a017\u00a0\/\/\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 || !negative) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchStat = NOT_MATCH;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a00;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchStat = NOT_MATCH;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a00;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/\/ 5. JSON \u7ed3\u675f\u7b26\u5904\u7406\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(chLocal ==\u00a0',') {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 bp += offset;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0this.ch =\u00a0this.charAt(bp);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchStat = VALUE;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 token = JSONToken.COMMA;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0negative ? -value : value;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(chLocal ==\u00a0'}') {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/\/ ... \u5904\u7406\u5bf9\u8c61\u7ed3\u675f\u548c\u5d4c\u5957\u7ed3\u6784\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 chLocal = charAt(bp + (offset++));\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(chLocal ==\u00a0',') {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 token = JSONToken.COMMA;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 bp += offset;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0this.ch =\u00a0this.charAt(bp);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(chLocal ==\u00a0']') {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 token = JSONToken.RBRACKET;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 bp += offset;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0this.ch =\u00a0this.charAt(bp);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(chLocal ==\u00a0'}') {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 token = JSONToken.RBRACE;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 bp += offset;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0this.ch =\u00a0this.charAt(bp);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(chLocal == EOI) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 token = JSONToken.EOF;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 bp += (offset -\u00a01);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ch = EOI;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchStat = NOT_MATCH;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a00;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchStat = END;\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 matchStat = NOT_MATCH;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a00;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0negative ? -value : value;\n\u00a0 \u00a0 }\n<\/code><\/pre>\n<p><strong>\u7c7b\u578b\u5b89\u5168\u68c0\u67e5\uff08AutoType\u68c0\u67e5\uff09<\/strong><\/p>\n<p>ParserConfig.java\u00a0\u4e2d\u7684checkAutoType\u65b9\u6cd5\u5bf9\u53cd\u5e8f\u5217\u5316\u7c7b\u578b\u505a\u9ed1\u767d\u540d\u5355\u68c0\u67e5\u3002<\/p>\n<pre><code>\/\/ ParserConfig.java - AutoType\u5b89\u5168\u68c0\u67e5\npublic\u00a0Class&lt;?&gt; checkAutoType(String typeName, Class&lt;?&gt; expectClass,\u00a0int\u00a0features) {\n\u00a0 \u00a0\u00a0if\u00a0(typeName ==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0null;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\n\u00a0 \u00a0\u00a0if\u00a0(typeName.length() &gt;=\u00a0192\u00a0|| typeName.length() &lt;\u00a03) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0new\u00a0JSONException(&quot;autoType is not support. &quot;\u00a0+ typeName);\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\n\u00a0 \u00a0\u00a0String\u00a0className\u00a0=\u00a0typeName.replace('$',\u00a0'.');\n\u00a0 \u00a0 Class&lt;?&gt; clazz =\u00a0null;\n\u00a0 \u00a0\u00a0\n\u00a0 \u00a0\u00a0final\u00a0long\u00a0BASIC\u00a0=\u00a00xcbf29ce484222325L;\n\u00a0 \u00a0\u00a0final\u00a0long\u00a0PRIME\u00a0=\u00a00x100000001b3L;\n\u00a0 \u00a0\u00a0\n\u00a0 \u00a0\u00a0final\u00a0long\u00a0h1\u00a0=\u00a0(BASIC ^ className.charAt(0)) * PRIME;\n\u00a0 \u00a0\u00a0\/\/ hash code\u7f16\u7801\u5339\u914d\u6027\u80fd\u4f18\u5316\n\u00a0 \u00a0\u00a0if\u00a0(h1 ==\u00a00xaf64164c86024f1aL) {\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0new\u00a0JSONException(&quot;autoType is not support. &quot;\u00a0+ typeName);\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0if\u00a0((h1 ^ className.charAt(className.length() -\u00a01)) * PRIME ==\u00a00x9198507b5af98f0L) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0new\u00a0JSONException(&quot;autoType is not support. &quot;\u00a0+ typeName);\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\n\u00a0 \u00a0\u00a0final\u00a0long\u00a0h3\u00a0=\u00a0(((((BASIC ^ className.charAt(0))\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 * PRIME)\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ^ className.charAt(1))\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 * PRIME)\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ^ className.charAt(2))\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 * PRIME;\n\u00a0 \u00a0\u00a0\n\u00a0 \u00a0\u00a0if\u00a0(autoTypeSupport || expectClass !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0long\u00a0hash\u00a0=\u00a0h3;\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0for\u00a0(int\u00a0i\u00a0=\u00a03; i &lt; className.length(); ++i) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 hash ^= className.charAt(i);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 hash *= PRIME;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(Arrays.binarySearch(denyHashCodes, hash) &gt;=\u00a00\u00a0&amp;&amp; TypeUtils.getClassFromMapping(typeName) ==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0new\u00a0JSONException(&quot;autoType is not support. &quot;\u00a0+ typeName);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(Arrays.binarySearch(acceptHashCodes, hash) &gt;=\u00a00) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 clazz = TypeUtils.loadClass(typeName, defaultClassLoader,\u00a0false);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(clazz !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0clazz;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0\/\/ ... \u66f4\u591a\u5b89\u5168\u68c0\u67e5\u903b\u8f91\n\u00a0 \u00a0\u00a0return\u00a0clazz;\n}\n<\/code><\/pre>\n<p><strong>\u5bf9\u8c61\u5b9e\u4f8b\u5316\u8fc7\u7a0b<\/strong><\/p>\n<p><strong>JavaBeanDeserializer.java\u4e2d\u7684createInstance\u65b9\u6cd5\u521b\u5efa\u5bf9\u8c61\u5b9e\u4f8b\uff1a<\/strong><\/p>\n<pre><code>\/\/ JavaBeanDeserializer.java - \u5bf9\u8c61\u5b9e\u4f8b\u5316\nprotected\u00a0Object\u00a0createInstance(DefaultJSONParser parser, Type\u00a0type) {\n\u00a0 \u00a0\u00a0if\u00a0(type\u00a0instanceof\u00a0Class) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(clazz.isInterface()) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u63a5\u53e3\u7c7b\u578b\u4f7f\u7528Java\u53cd\u5c04\u521b\u5efa\u5b9e\u4f8b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Class&lt;?&gt; clazz = (Class&lt;?&gt;)\u00a0type;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0ClassLoader\u00a0loader =\u00a0Thread.currentThread().getContextClassLoader();\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 final\u00a0JSONObject\u00a0obj =\u00a0new\u00a0JSONObject();\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Object\u00a0proxy =\u00a0Proxy.newProxyInstance(loader,\u00a0new\u00a0Class&lt;?&gt;[] { clazz }, obj);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0proxy;\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\n\u00a0 \u00a0\u00a0if\u00a0(beanInfo.defaultConstructor\u00a0==\u00a0null\u00a0&amp;&amp; beanInfo.factoryMethod\u00a0==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0null;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\n\u00a0 \u00a0\u00a0Object\u00a0object;\n\u00a0 \u00a0\u00a0try\u00a0{\n\u00a0 \u00a0\u00a0\/\/\u901a\u8fc7\u6784\u9020\u5668\u521b\u5efa\u5b9e\u4f8b\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0Constructor&lt;?&gt; constructor = beanInfo.defaultConstructor;\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(beanInfo.defaultConstructorParameterSize\u00a0==\u00a00) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0object\u00a0= constructor.newInstance();\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0ParseContext\u00a0context = parser.getContext();\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(context ==\u00a0null\u00a0|| context.object\u00a0==\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0new\u00a0JSONException(&quot;can't create non-static inner class instance.&quot;);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\n\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 final\u00a0Class&lt;?&gt; enclosingClass = constructor.getDeclaringClass().getEnclosingClass();\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0object\u00a0= constructor.newInstance(context.object);\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\u00a0catch\u00a0(JSONException e) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0e;\n\u00a0 \u00a0 }\u00a0catch\u00a0(Exception\u00a0e) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0new\u00a0JSONException(&quot;create instance error, class &quot;\u00a0+ clazz.getName(), e);\n\u00a0 \u00a0 }\n\n\n\u00a0 \u00a0\u00a0return\u00a0object;\n}\n<\/code><\/pre>\n<p><strong>FieldDeserializer.java\u4e2d\u7684setValue\u65b9\u6cd5\u901a\u8fc7\u53cd\u5c04\u5b9e\u73b0\u5b57\u6bb5\u8bbe\u7f6e\uff1a<\/strong><\/p>\n<pre><code>\/\/ FieldDeserializer.java - \u5c5e\u6027\u8d4b\u503c\u7684\u6838\u5fc3\u5b9e\u73b0\npublic\u00a0void\u00a0setValue(Object\u00a0object,\u00a0Object\u00a0value) {\n\u00a0 \u00a0\u00a0if\u00a0(value ==\u00a0null\u00a0&amp;&amp; fieldInfo.fieldClass.isPrimitive()) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return;\n\u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(fieldInfo.fieldClass\u00a0==\u00a0String.class\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 &amp;&amp; fieldInfo.format\u00a0!=\u00a0null\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 &amp;&amp; fieldInfo.format.equals(&quot;trim&quot;)) {\n\u00a0 \u00a0 \u00a0 \u00a0 value = ((String) value).trim();\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\n\u00a0 \u00a0\u00a0try\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0Method\u00a0method = fieldInfo.method;\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(method !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(fieldInfo.getOnly) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u5904\u7406\u53ea\u8bfb\u5c5e\u6027\u7684\u7279\u6b8a\u60c5\u51b5\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(fieldInfo.fieldClass\u00a0==\u00a0AtomicInteger.class) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0AtomicInteger\u00a0atomic = (AtomicInteger) method.invoke(object);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(atomic !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 atomic.set(((AtomicInteger) value).get());\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0if\u00a0(Map.class.isAssignableFrom(method.getReturnType())) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Map\u00a0map = (Map) method.invoke(object);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(map !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 map.putAll((Map) value);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Collection\u00a0collection = (Collection) method.invoke(object);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(collection !=\u00a0null\u00a0&amp;&amp; value !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 collection.clear();\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 collection.addAll((Collection) value);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u901a\u8fc7setter\u65b9\u6cd5\u8d4b\u503c\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 method.invoke(object, value);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 }\u00a0else\u00a0{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u901a\u8fc7\u5b57\u6bb5\u76f4\u63a5\u8d4b\u503c\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 final\u00a0Field\u00a0field = fieldInfo.field;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0if\u00a0(field !=\u00a0null) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 field.set(object, value);\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 \u00a0 \u00a0 }\n\u00a0 \u00a0 }\u00a0catch\u00a0(Exception\u00a0e) {\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0throw\u00a0new\u00a0JSONException(&quot;set property error, &quot;\u00a0+ clazz.getName() +\u00a0&quot;#&quot;\u00a0+ fieldInfo.name, e);\n\u00a0 \u00a0 }\n}\n<\/code><\/pre>\n<h3>4.4 \u53cd\u5e8f\u5217\u5316\u5c0f\u7ed3<\/h3>\n<p>Fastjson\u901a\u8fc7JSON.parseObject()\u95e8\u9762API\u8c03\u7528DefaultJSONParser\u63a7\u5236\u5668\uff0c\u5229\u7528JSONLexer\u8fdb\u884c\u8bcd\u6cd5\u5206\u6790\u89e3\u6790JSON\u5b57\u7b26\u4e32\uff0c\u7ecf\u8fc7AutoType\u5b89\u5168\u68c0\u67e5\u540e\u4f7f\u7528ASM\u5b57\u8282\u7801\u751f\u6210\u52a8\u6001\u53cd\u5e8f\u5217\u5316\u5668\u6216\u53cd\u5c04\u673a\u5236\u521b\u5efaJava\u5bf9\u8c61\u5b9e\u4f8b\u5e76\u9010\u5b57\u6bb5\u8d4b\u503c\u3002<\/p>\n<h2>\u4e94\u3001\u7279\u6027\u8bb2\u89e3<\/h2>\n<h3>5.1 ASM\u6027\u80fd\u4f18\u5316<\/h3>\n<p>ASM \u662f fastjson \u7c7b\u4f3c\u4e8e JIT\uff0c\u5728\u8fd0\u884c\u65f6\u628a\u300c\u53cd\u5c04\u8c03\u7528\u300d\u7ffb\u8bd1\u6210\u300c\u76f4\u63a5\u5b57\u6bb5\u8bbf\u95ee + \u65b9\u6cd5\u8c03\u7528\u300d\u7684\u5b57\u8282\u7801\uff0c\u4ece\u800c\u628a\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\u6027\u80fd\u63d0\u5347 20% \u4ee5\u4e0a\uff0c\u5f53\u7136\u968f\u7740JVM\u5bf9\u53cd\u5c04\u6027\u80fd\u7684\u4f18\u5316\u6027\u80fd\u5dee\u6b63\u5728\u9010\u6e10\u88ab\u7f29\u5c0f\u3002\u4e0b\u56fe\u662f\u4f5c\u8005\u4f7f\u7528\u5de5\u5177\u7c7b\u8bfb\u53d6\u7684\u52a8\u6001\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\u5668\u6e90\u7801\u7247\u6bb5\u3002<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"528\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdmJzp\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"559\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdmJzq\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<h3>5.2\u00a0 AutoType\u673a\u5236<\/h3>\n<p>AutoType\u662f fastjson \u7684\u201c\u52a8\u6001\u591a\u6001\u8fd8\u539f\u201d\u65b9\u6848:<\/p>\n<p>\u5e8f\u5217\u5316\u65f6\u628a\u5177\u4f53\u5b50\u7c7b\u540d\u5b57\u5199\u8fdb\u00a0&#8220;@type&#8221;\uff0c\u53cd\u5e8f\u5217\u5316\u65f6\u5148\u52a0\u8f7d\u7c7b \u2192 \u518d\u8c03 setter \u2192 \u5b8c\u6210\u8fd8\u539f\u3002<\/p>\n<p>\u00a0\u901f\u5ea6\u4e0a\u201c\u6307\u9488\u5f15\u7528\u201d\u5373\u53ef\u5b9a\u4f4d\u5e8f\u5217\u5316\u5668\uff0c\u529f\u80fd\u4e0a\u9760\u00a0@type\u00a0\u5b57\u6bb5\u628a\u88ab\u64e6\u9664\u7684\u6cdb\u578b\/\u63a5\u53e3\/\u7236\u7c7b\u91cd\u65b0\u6620\u5c04\u56de\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n<p>\u5728\u672a\u5f00\u542fAutoType\u673a\u5236\u60c5\u51b5\u4e0b\uff0c\u5728\u5c06store\u5bf9\u8c61\u5e8f\u5217\u5316\u6210JSON\u4e32\u540e\uff0c\u518d\u53cd\u5e8f\u5217\u5316\u4e3a\u5bf9\u8c61\u65f6\u7531\u4e8e\u5b57\u6bb5\u7684\u7c7b\u578b\u4e3a\u63a5\u53e3\u65e0\u6cd5\u8f6c\u6362\u6210\u5177\u4f53\u7684Dog\u7c7b\u578b\u793a\u4f8b\uff1b\u5f00\u542fAutoType\u673a\u5236\u540e\uff0c\u5e8f\u5217\u5316\u65f6\u5c06\u7c7b\u578b\u4e00\u5e76\u5199\u5165\u5230JSON\u4e32\u5185\uff0c\u540e\u7eed\u8fdb\u884c\u53cd\u5e8f\u5217\u5316\u65f6\u53ef\u4ee5\u6839\u636e\u8fd9\u4e2a\u7c7b\u578b\u8fd8\u539f\u6210\u5177\u4f53\u7684\u7c7b\u578b\u5b9e\u4f8b\u3002<\/p>\n<pre><code>interface\u00a0Animal\u00a0{}\n\n\nclass\u00a0Dog\u00a0implements\u00a0Animal\u00a0{\n\u00a0 \u00a0\u00a0private\u00a0String\u00a0name;\n\u00a0 \u00a0\u00a0private\u00a0double weight;\n\n\n\u00a0 \u00a0\u00a0\/\/\u7701\u7565getter,setter\n}\n\n\nclass\u00a0PetStore\u00a0{\n\u00a0 \u00a0\u00a0private\u00a0Animal\u00a0animal;\n}\n\n\n\n\npublic\u00a0static\u00a0void\u00a0main(String[] args) {\n\u00a0 \u00a0\u00a0Animal\u00a0dog =\u00a0new\u00a0Dog(&quot;dodi&quot;,\u00a012);\n\u00a0 \u00a0\u00a0PetStore\u00a0store =\u00a0new\u00a0PetStore(dog);\n\u00a0 \u00a0\u00a0String\u00a0jsonString =\u00a0JSON.toJSONString(store);\n\u00a0 \u00a0\u00a0PetStore\u00a0petStore =\u00a0JSON.parseObject(jsonString,\u00a0PetStore.class);\n\u00a0 \u00a0\u00a0Dog\u00a0parsedDog = (Dog) petStore.getAnimal();\n}\n<\/code><\/pre>\n<p><img decoding=\"async\" width=\"723\" height=\"229\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdmJzr\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<pre><code>public\u00a0static\u00a0void\u00a0main(String[] args) {\n\u00a0 \u00a0\u00a0Animal\u00a0dog =\u00a0new\u00a0Dog(&quot;dodi&quot;,\u00a012);\n\u00a0 \u00a0\u00a0PetStore\u00a0store =\u00a0new\u00a0PetStore(dog);\n\u00a0 \u00a0\u00a0String\u00a0jsonString =\u00a0JSON.toJSONString(store,\u00a0SerializerFeature.WriteClassName);\n\u00a0 \u00a0\u00a0PetStore\u00a0petStore =\u00a0JSON.parseObject(jsonString,\u00a0PetStore.class);\n\u00a0 \u00a0\u00a0Dog\u00a0parsedDog = (Dog) petStore.getAnimal();\n}\n<\/code><\/pre>\n<p><img decoding=\"async\" width=\"723\" height=\"178\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdmJzs\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p>AutoType \u8ba9 fastjson \u5728\u53cd\u5e8f\u5217\u5316\u65f6\u6839\u636e\u00a0@type\u00a0\u5b57\u6bb5\u52a8\u6001\u52a0\u8f7d\u4efb\u610f\u7c7b\uff0c\u8fd9\u4e00\u201c\u4fbf\u5229\u201d\u5374\u6210\u4e3a\u653b\u51fb\u8005\u8fdc\u7a0b\u4ee3\u7801\u6267\u884c\u7684\u5feb\u6377\u901a\u9053\uff1a\u901a\u8fc7\u628aJdbcRowSetImpl\u7b49 JNDI \u654f\u611f\u7c7b\u5199\u8fdb JSON\uff0c\u670d\u52a1\u7aef\u5728\u8c03\u7528 setter \u7684\u77ac\u95f4\u5c31\u4f1a\u5411\u5916\u90e8 LDAP\/RMI \u670d\u52a1\u5668\u62c9\u53d6\u6076\u610f\u5b57\u8282\u7801\uff0c\u5b8c\u6210 RCE\uff1b\u800c\u5b98\u65b9\u957f\u671f\u4f9d\u8d56\u201c\u9ed1\u540d\u5355\u201d\u5835\u6f0f\uff0c\u5bfc\u81f4 1.2.25\u21921.2.80 \u51fa\u73b0 L \u63cf\u8ff0\u7b26\u3001Throwable \u4e8c\u6b21\u53cd\u5e8f\u5217\u5316\u3001\u5185\u90e8\u7c7b\u7b49\u8fde\u7eed\u7ed5\u8fc7\uff0c\u5f62\u6210\u201c\u8865\u4e01-\u7ed5\u8fc7-\u518d\u8865\u4e01\u201d\u7684\u732b\u9f20\u6e38\u620f\uff0c \u867d\u7136\u57281.2.68 \u5f15\u5165 safeMode \u4f46\u4e3a\u4e86\u517c\u5bb9\u6027\u9700\u8981\u4f7f\u7528\u8005\u624b\u52a8\u5f00\u542f \uff0c\u800c\u4e14\u5b9e\u73b0\u4e5f\u4e0d\u591f\u5065\u58ee\uff0c\u5f00\u542fsafeMode\u4ecd\u6709\u5229\u7528\u4ee3\u7801\u6f0f\u6d1e\u7ed5\u8fc7\u68c0\u67e5\u98ce\u9669\uff0c\u540e\u7eed\u7248\u672c\u5bf9safeMode\u52a0\u56fa\u5e76\u5bf9\u5df2\u77e5\u5b89\u5168\u6f0f\u6d1e\u6e05\u96f6\uff0c\u76f4\u5230\u6700\u65b01.2.83\u7248\u672c\u5b89\u5168\u95ee\u9898\u4e5f\u4e0d\u80fd\u8bf4\u5f7b\u5e95\u89e3\u51b3\u3002<\/p>\n<h3>5.3 \u6d41\u5f0f\u89e3\u6790<\/h3>\n<p>Fastjson \u63d0\u4f9b\u4e00\u5957 Streaming API\uff0c\u6838\u5fc3\u7c7bJSONReader\u00a0\/JSONWriter\uff0c\u884c\u4e1a\u5185\u60ef\u79f0\u300c\u6d41\u5f0f\u89e3\u6790\u300d\u6216\u300c\u589e\u91cf\u89e3\u6790\u300d\uff0c\u4e3b\u8981\u7528\u4e8e\u5904\u7406JSON\u5927\u6587\u4ef6\u89e3\u6790\u3002\u6280\u672f\u4e0a\u6d41\u5f0f\u89e3\u6790\u91c7\u7528\u201c\u62c9\u6a21\u5f0f\uff08pull parsing\uff09\u201d\uff0c\u5e95\u5c42\u7ef4\u62a4 8 KB \u6ed1\u52a8\u7f13\u51b2\uff0c\u8bcd\u6cd5\u5206\u6790\u5668\uff08Tokenizer\uff09\u628a\u5b57\u8282\u6d41\u5207\u6210 token \u6d41\uff0c\u8bed\u6cd5\u72b6\u6001\u673a\u6839\u636e token \u7c7b\u578b\u9a71\u52a8\u53cd\u5e8f\u5217\u5316\u5668\uff08ObjectReader\uff09\u5373\u65f6\u4ea7\u51fa Java \u5bf9\u8c61\uff0c\u5bf9\u8c61\u4e00\u65e6\u4ea4\u4ed8\u7ed9\u7528\u6237\u4ee3\u7801\u5904\u7406\u540e\uff0c\u5185\u90e8\u5f15\u7528\u7acb\u5373\u91ca\u653e\u3002\u8fd9\u79cd\u65b9\u5f0f\u5185\u5b58\u4e2d\u4e0d\u4f1a\u4fdd\u5b58\u6240\u6709\u5bf9\u8c61\uff0c\u5bf9\u8c61\u5904\u7406\u5b8c\u5373\u88ab\u4e22\u5f03\uff0c\u56e0\u6b64\u53ef\u4ee5\u5904\u7406\u6570\u636e\u91cf\u8fdc\u5927\u4e8e\u5185\u5b58\u7684\u6570\u636e\uff0c\u800c\u4e0d\u4f1a\u51fa\u73b0OOM\u3002\u4e0b\u9762\u662f\u4f7f\u7528\u6d41\u5f0f\u89e3\u6790\u7684\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<pre><code>\/\/ \u4f9d\u8d56\uff1acom.alibaba:fastjson:1.2.83\ntry\u00a0(JSONReader reader =\u00a0new\u00a0JSONReader(\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0new\u00a0InputStreamReader(\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0new\u00a0FileInputStream(&quot;huge-array.json&quot;),\u00a0StandardCharsets.UTF_8))) {\n\u00a0 \u00a0 reader.startArray(); \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u544a\u8bc9\u89e3\u6790\u5668\uff1a\u6839\u8282\u70b9\u662f []\n\u00a0 \u00a0\u00a0while\u00a0(reader.hasNext()) { \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u62c9\u53d6\u4e0b\u4e00\u6761\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0Order\u00a0order = reader.readObject(Order.class);\u00a0\/\/ \u77ac\u65f6\u5bf9\u8c61\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0processOrder(order);\/\/\u4e1a\u52a1\u5904\u7406\n\u00a0 \u00a0 \u00a0 \u00a0 orderRepository.save(order); \u00a0 \u00a0\u00a0\/\/ \u7acb\u5373\u843d\u76d8\uff0c\u5185\u5b58\u5373\u53ef\u56de\u6536\n\u00a0 \u00a0 }\n\u00a0 \u00a0 reader.endArray();\n}\n<\/code><\/pre>\n<h2>\u516d\u3001\u603b\u7ed3<\/h2>\n<p>Fastjson\u6838\u5fc3\u7279\u6027\u5728\u4e8e\u9ad8\u901f\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\uff0c\u5229\u7528ASM\u5728\u8fd0\u884c\u65f6\u751f\u6210\u5b57\u8282\u7801\u52a8\u6001\u521b\u5efa\u89e3\u6790\u5668\uff0c\u51cf\u5c11\u53cd\u5c04\uff1bAutoType\u5b57\u6bb5\u652f\u6301\u591a\u6001\uff0c\u5374\u5e26\u6765\u53cd\u5e8f\u5217\u5316RCE\u98ce\u9669\uff0c\u5efa\u8bae\u5173\u95edAutoType\uff0c\u5f00\u542fsafeMode\u3002\u9009\u578b\u5efa\u8bae\uff1a\u5728\u9009\u62e9JSON\u5e8f\u5217\u5316\u6846\u67b6\u65f6\u5bf9\u4e8e\u975e\u6781\u7aef\u6027\u80fd\u8981\u6c42\u63a8\u8350Jackson\uff0c\u6216\u8005\u4f7f\u7528Fastjson2\uff0c\u5176\u6539\u7528LambdaMetafactory\u66ff\u6362ASM\uff0c\u6027\u80fd\u518d\u63d0\u534730%\uff0c\u9ed8\u8ba4\u5173\u95edAutoType\u5b89\u5168\u6027\u6709\u4fdd\u8bc1\u3002<\/p>\n<p><strong>\u53c2\u8003\u8d44\u6599\uff1a<\/strong><\/p>\n<ul>\n<li>FastJson \u53cd\u5e8f\u5217\u5316\u6f0f\u6d1e\u539f\u7406\u5206\u6790\uff08<a href=\"https:\/\/link.segmentfault.com\/?enc=i5i7bZbl38UNSVhCK6YO4Q%3D%3D.soSjjVQgxoNJo7oc0Ns6qVWPiafiZiUNgvmGFZBgu8MQE3EGwlSz5LcCFsSub9Bd0IftM1cJCOActODgW1CxZA%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/www.cnblogs.com\/Only-xiaoxiao\/p\/17213248.html\uff09<\/a><\/li>\n<li>\u5e8f\u5217\u5316\u4e0e\u53cd\u5e8f\u5217\u5316\u2014\u2014FastJSON\u3001Jackson\u3001Gson\u6027\u80fd\u6d4b\u8bd5\uff08<a href=\"https:\/\/link.segmentfault.com\/?enc=0czY5o%2FPdvf53elc2NOh4w%3D%3D.TQ%2B%2F5W8WFeV%2B0Ug1fuvMjVTYOVUIf2%2Fi3jAOyz%2FRTuS2AwvTPYO21LqCBS8EPaT%2F\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/zhuanlan.zhihu.com\/p\/529342385\uff09<\/a><\/li>\n<li>FASTJSON 2 Autotype\u673a\u5236\u4ecb\u7ecd\uff08<a href=\"https:\/\/link.segmentfault.com\/?enc=paoot4PWc9BRmEvHRmfNzw%3D%3D.87X9Ib8wutMmU1g4eha13v2YVei%2F%2FknFz9Rjb52jJenGuyihAGNxjl1zdQsjNfREFmfEsjumzibtRRqWe601Zg%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/alibaba.github.io\/fastjson2\/autotype_cn.html\uff09<\/a><br \/>*<\/li>\n<\/ul>\n<h4>\u5f80\u671f\u56de\u987e<\/h4>\n<p>1.\u00a0\u7528\u597d TTL Agent \u4e0d\u8e29\u96f7\uff1a\u907f\u5f00\u5185\u5b58\u6cc4\u9732\u4e0eCPU 100%\u4e24\u5927\u6838\u5fc3\u5751\uff5c\u5f97\u7269\u6280\u672f<\/p>\n<p>2.\u00a0\u7ebf\u7a0b\u6c60ThreadPoolExecutor\u6e90\u7801\u6df1\u5ea6\u89e3\u6790\uff5c\u5f97\u7269\u6280\u672f<\/p>\n<p>3.\u00a0\u57fa\u4e8e\u6d4f\u89c8\u5668\u6269\u5c55 API Mock \u5de5\u5177\u5f00\u53d1\u63a2\u7d22\uff5c\u5f97\u7269\u6280\u672f<\/p>\n<p>4.\u00a0\u7834\u89e3gh-ost\u53d8\u66f4\u5bfc\u81f4MySQL\u8868\u81a8\u80c0\u4e4b\u8c1c\uff5c\u5f97\u7269\u6280\u672f<\/p>\n<p>5.\u00a0MySQL\u5355\u8868\u4e3a\u4f55\u522b\u8d852000\u4e07\u884c\uff1f\u63ed\u79d8B+\u6811\u4e0e16KB\u9875\u7684\u751f\u6b7b\u535a\u5f08\uff5c\u5f97\u7269\u6280\u672f<\/p>\n<h4>\u6587 \/\u5251\u4e5d<\/h4>\n<p>\u5173\u6ce8\u5f97\u7269\u6280\u672f\uff0c\u6bcf\u5468\u66f4\u65b0\u6280\u672f\u5e72\u8d27<\/p>\n<p>\u8981\u662f\u89c9\u5f97\u6587\u7ae0\u5bf9\u4f60\u6709\u5e2e\u52a9\u7684\u8bdd\uff0c\u6b22\u8fce\u8bc4\u8bba\u8f6c\u53d1\u70b9\u8d5e\uff5e<\/p>\n<p>\u672a\u7ecf\u5f97\u7269\u6280\u672f\u8bb8\u53ef\u4e25\u7981\u8f6c\u8f7d\uff0c\u5426\u5219\u4f9d\u6cd5\u8ffd\u7a76\u6cd5\u5f8b\u8d23\u4efb\u3002<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000047325053\">https:\/\/segmentfault.com\/a\/1190000047325053<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u6982\u8ff0 Fastjson \u662f\u963f\u91cc\u5df4\u5df4\u5f00\u6e90\u7684\u9ad8\u6027\u80fd JSON \u5e8f\u5217\u5316\u5904\u7406\u5e93\uff0c\u5176\u4e3b\u8981\u4ee5\u5904\u7406\u5c0f\u6570\u636e\u65f6\u901f\u5ea6\u6700\u5feb\u800c\u8457\u79f0 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10021035","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10021035","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10021035"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10021035\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10021035"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10021035"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10021035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}