{"id":10008037,"date":"2023-07-05T14:59:44","date_gmt":"2023-07-05T06:59:44","guid":{"rendered":"https:\/\/ityet.com\/?p=10008037"},"modified":"2023-07-05T14:59:44","modified_gmt":"2023-07-05T06:59:44","slug":"spring-loaded%e4%bb%a3%e7%a0%81%e7%83%ad%e6%9b%b4%e6%96%b0%e5%ae%9e%e8%b7%b5%e5%92%8c%e5%8e%9f%e7%90%86%e5%88%86%e6%9e%90-%e4%ba%ac%e4%b8%9c%e4%ba%91%e6%8a%80%e6%9c%af%e5%9b%a2%e9%98%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008037","title":{"rendered":"Spring Loaded\u4ee3\u7801\u70ed\u66f4\u65b0\u5b9e\u8df5\u548c\u539f\u7406\u5206\u6790 | \u4eac\u4e1c\u4e91\u6280\u672f\u56e2\u961f"},"content":{"rendered":"

1\u3001\u5f15\u8a00<\/h2>\n

\u5f00\u53d1\u8005\u5728\u7f16\u7801\u6548\u7387\u548c\u5feb\u901f\u8fed\u4ee3\u4e2d\u7684\u75db\u70b9\u573a\u666f\u5305\u62ec\uff1a<\/p>\n

    \n
  1. \u4fee\u6539\u4ee3\u7801\u540e\uff0c\u9700\u8981\u9891\u7e41\u91cd\u542f\u5e94\u7528\uff0c\u5bfc\u81f4\u5f00\u53d1\u6548\u7387\u4f4e\u4e0b\uff1b<\/li>\n
  2. \u5b9e\u65f6\u8c03\u8bd5\u65f6\uff0c\u4e0d\u80fd\u7acb\u5373\u770b\u5230\u4ee3\u7801\u4fee\u6539\u7684\u7ed3\u679c\uff1b<\/li>\n
  3. \u5927\u578b\u9879\u76ee\u4e2d\uff0c\u91cd\u542f\u7684\u65f6\u95f4\u6210\u672c\u8f83\u9ad8\u3002<\/li>\n<\/ol>\n

    \u9488\u5bf9\u8fd9\u4e9b\u95ee\u9898\uff0c\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8\u5982\u4f55\u5229\u7528Spring Loaded\u70ed\u66f4\u65b0\u6280\u672f\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\uff0c\u51cf\u5c11\u7f16\u8bd1\u548c\u91cd\u542f\u65f6\u95f4\u3002\u5206\u6790Spring Loaded\u7684\u70ed\u66f4\u65b0\u539f\u7406\uff0c\u4ee5\u53ca\u5b9e\u9645\u5e94\u7528\u8fc7\u7a0b\u4e2d\u6240\u9700\u7684\u64cd\u4f5c\u548c\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n

    2\u3001\u6846\u67b6\u7b80\u4ecb<\/h2>\n

    Spring Loaded is a JVM agent for reloading class file changes whilst a JVM is running<\/strong>. It transforms classes at loadtime to make them amenable to later reloading. Unlike ‘hot code replace’ which only allows simple changes once a JVM is running (e.g. changes to method bodies),\u00a0Spring Loaded allows you to add\/modify\/delete methods\/fields\/constructors<\/strong>. The annotations on types\/methods\/fields\/constructors can also be modified and it is possible to add\/remove\/change values in enum types.<\/p><\/blockquote>\n

    Spring Loaded \u662f\u4e00\u4e2a JVM \u4ee3\u7406\uff0c\u53ef\u4ee5\u5728 JVM \u8fd0\u884c\u65f6\u91cd\u65b0\u52a0\u8f7d\u7c7b\u6587\u4ef6\u7684\u66f4\u6539\u3002\u5b83\u4f1a\u5728\u52a0\u8f7d\u65f6\u8f6c\u6362\u7c7b\uff0c\u4ee5\u4fbf\u7a0d\u540e\u91cd\u65b0\u52a0\u8f7d\u3002\u4e0e\u201c\u70ed\u4ee3\u7801\u66ff\u6362\u201d\u53ea\u5141\u8bb8\u5728 JVM \u8fd0\u884c\u65f6\u8fdb\u884c\u7b80\u5355\u66f4\u6539\uff08\u4f8b\u5982\u66f4\u6539\u65b9\u6cd5\u4f53\uff09\u4e0d\u540c\uff0cSpring Loaded \u5141\u8bb8\u60a8\u6dfb\u52a0\/\u4fee\u6539\/\u5220\u9664\u65b9\u6cd5\/\u5b57\u6bb5\/\u6784\u9020\u51fd\u6570\u3002\u8fd8\u53ef\u4ee5\u4fee\u6539\u7c7b\u578b\/\u65b9\u6cd5\/\u5b57\u6bb5\/\u6784\u9020\u51fd\u6570\u4e0a\u7684\u6ce8\u89e3\uff0c\u5e76\u4e14\u53ef\u4ee5\u6dfb\u52a0\/\u5220\u9664\/\u66f4\u6539\u679a\u4e3e\u7c7b\u578b\u4e2d\u7684\u503c\u3002<\/p>\n

    3\u3001\u5982\u4f55\u4f7f\u7528<\/h2>\n

    3.1 \u4e0b\u8f7dAgent\u63d2\u4ef6<\/h3>\n
    https:\/\/repo1.maven.org\/maven2\/org\/springframework\/springloaded\/1.2.8.RELEASE\/springloaded-1.2.8.RELEASE.jar<\/code><\/pre>\n
    3.2 \u5f15\u5165Agent\u63d2\u4ef6<\/h3>\n
    \u5728jvm\u7684\u542f\u52a8\u547d\u4ee4\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u53c2\u6570<\/p>\n
    -javaagent:\/Users\/you\/runtime\/springloaded-1.2.8.RELEASE.jar -noverify<\/code><\/pre>\n
    3.3 \u4fee\u6539\u5e76\u91cd\u65b0\u7f16\u8bd1<\/h3>\n
    \u4fee\u6539\u4ee3\u7801\u540e\u6267\u884cBuild->Recompile\u547d\u4ee4\uff0c\u53ef\u4ee5\u770b\u5230\u5728class reloaded\u5b8c\u6210\u540e\uff0c\u7a0b\u5e8f\u7684\u8fd0\u884c\u903b\u8f91\u53d1\u751f\u4e86\u53d8\u5316<\/p>\n
    \"\"<\/p>\n
    4\u3001\u539f\u7406\u5206\u6790<\/h2>\n
    4.1 \u4ee3\u7801\u7f16\u8bd1\u5206\u6790<\/h3>\n
    \u5148\u6765\u770b\u4e00\u6bb5\u6e90\u4ee3\u7801\uff0c\u8fd9\u662f\u4e00\u4e2aRpcService\u7c7b\uff0c\u5b9a\u4e49\u4e86target\u5b57\u6bb5\u3001targetStatic\u9759\u6001\u5b57\u6bb5\u548csay\u65b9\u6cd5\uff0c\u73b0\u5728\u6211\u4eec\u7f16\u8bd1\u5b83\u3002<\/p>\n
    public class RpcService {\n    private String target = "rpc";\n    private static String targetStatic = "rpc static";\n    public String say() {\n        return "RpcService say hello SpringLoaded" + target;\n    }\n}<\/code><\/pre>\n
    SpringLoaded\u5bf9\u7c7b\u7f16\u8bd1\u540e\u6dfb\u52a0\u4e86\u4e00\u4e9b\u8ddf\u8e2a\u8bb0\u5f55\u5b57\u6bb5\uff0c\u6dfb\u52a0\u65b9\u6cd5\u62e6\u622a\u5224\u65ad\u3002<\/p>\n
    public static ReloadableType r$type = TypeRegistry.getReloadableType(0, 1);\n\npublic transient ISMgr r$fields;\n\npublic static final SSMgr r$sfields;\n\npublic String hello() {\n    if (r$type.changed(0) == 1) {\n        return r$type.fetchLatest()).say(this);\n    }\n    String targetNew = TypeRegistry.instanceFieldInterceptionRequired(1, "target") ? (String)r$get(this, "target") : this.target;\n    return "RpcService say hello SpringLoaded" + targetNew;\n}<\/code><\/pre>\n
    \u6211\u4eec\u53ef\u4ee5\u5728\u4ee3\u7801\u8fd0\u884c\u65f6\uff0c\u4f7f\u7528getDeclaredField\u3001getDeclaredMethod\u7b49\u51fd\u6570\u5728\u8fd0\u884c\u65f6\u83b7\u53d6\u7c7b\u6210\u5458\u3001\u65b9\u6cd5\u4fe1\u606f\uff0c\u6b64\u65f6\u53ef\u4ee5\u770b\u5230\u589e\u5f3a\u540e\u7684\u7c7b\u591a\u4e86\u5982\u4e0b\u5b57\u6bb5\u548c\u65b9\u6cd5\u3002<\/p>\n
    \"\"<\/p>\n
    \"\"<\/p>\n
    \u5728\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230RpcService\u7c7b\u5305\u542b\u4e86\u4e00\u4e9b\u65b0\u7684\u5b57\u6bb5\u548c\u65b9\u6cd5\uff0c\u8fd9\u4e9b\u90fd\u662fSpring Loaded\u6846\u67b6\u589e\u52a0\u7684\u3002<\/p>\n
    \u2022r$type\u662f\u4e00\u4e2a\u9759\u6001\u53d8\u91cf\uff0c\u5176\u7c7b\u578b\u4e3aReloadableType\u3002\u8fd9\u4e2a\u5b57\u6bb5\u7528\u4e8e\u8868\u793a\u5f53\u524d\u7c7b\u7684\u53ef\u91cd\u8f7d\u7c7b\u578b\uff0c\u5b83\u5305\u542b\u4e86\u5f53\u524d\u7c7b\u7684\u6700\u65b0\u5b57\u8282\u7801\u548c\u5176\u4ed6\u76f8\u5173\u4fe1\u606f\u3002<\/p>\n