{"id":10008232,"date":"2023-09-05T20:17:11","date_gmt":"2023-09-05T12:17:11","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008232"},"modified":"2023-09-05T20:17:11","modified_gmt":"2023-09-05T12:17:11","slug":"%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9atomcat-%e4%b8%ba%e4%bb%80%e4%b9%88%e8%a6%81%e7%a0%b4%e5%9d%8f-java-%e5%8f%8c%e4%ba%b2%e5%a7%94%e6%b4%be%e6%9c%ba%e5%88%b6%ef%bc%9f%e8%a2%ab%e9%97%ae%e5%82%bb","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008232","title":{"rendered":"\u9762\u8bd5\u5b98\uff1aTomcat \u4e3a\u4ec0\u4e48\u8981\u7834\u574f Java \u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\uff1f\u88ab\u95ee\u50bb\u773c\u4e86\u3002\u3002\u3002"},"content":{"rendered":"<p>\u6765\u6e90\uff1awww.jianshu.com\/p \/abf6fd4531e7<\/p>\n<p>\u6211\u60f3\uff0c\u5728\u7814\u7a76tomcat \u7c7b\u52a0\u8f7d\u4e4b\u524d\uff0c\u6211\u4eec\u590d\u4e60\u4e00\u4e0b\u6216\u8005\u8bf4\u5de9\u56fa\u4e00\u4e0bjava 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title=\"\"><\/p>\n<p>\u56fe\u4e2d\u5404\u4e2a\u7c7b\u52a0\u8f7d\u5668\u4e4b\u95f4\u7684\u5173\u7cfb\u6210\u4e3a \u7c7b\u52a0\u8f7d\u5668\u7684\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\uff08Parents Dlegation Mode\uff09\u3002\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u8981\u6c42\u9664\u4e86\u9876\u5c42\u7684\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u4e4b\u5916\uff0c\u5176\u4f59\u7684\u7c7b\u52a0\u8f7d\u5668\u90fd\u5e94\u5f53\u7531\u81ea\u5df1\u7684\u7236\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\uff0c\u8fd9\u91cc\u7c7b\u52a0\u8f7d\u5668\u4e4b\u95f4\u7684\u7236\u5b50\u5173\u7cfb\u4e00\u822c\u4e0d\u4f1a\u4ee5\u7ee7\u627f\u7684\u5173\u7cfb\u6765\u5b9e\u73b0\uff0c\u800c\u662f\u90fd\u4f7f\u7528\u7ec4\u5408\u5173\u7cfb\u6765\u590d\u7528\u7236\u52a0\u8f7d\u5668\u7684\u4ee3\u7801\u3002<\/p>\n<p>\u7c7b\u52a0\u8f7d\u5668\u7684\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u5728JDK1.2 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Java\u7c7b\u578b\u4f53\u7cfb\u4e2d\u6700\u57fa\u7840\u7684\u884c\u4e3a\u5c31\u65e0\u6cd5\u4fdd\u8bc1\u3002\u5e94\u7528\u7a0b\u5e8f\u4e5f\u5c06\u4f1a\u53d8\u5f97\u4e00\u7247\u6df7\u4e71\u3002<\/p>\n<h3>\u53cc\u4eb2\u59d4\u4efb\u6a21\u578b\u65f6\u5982\u4f55\u5b9e\u73b0\u7684\uff1f<\/h3>\n<p>\u975e\u5e38\u7b80\u5355\uff1a\u6240\u6709\u7684\u4ee3\u7801\u90fd\u5728<code>java.lang.ClassLoader<\/code>\u4e2d\u7684loadClass\u65b9\u6cd5\u4e4b\u4e2d\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"528\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc9xNW\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<blockquote><p>\u903b\u8f91\u6e05\u6670\u6613\u61c2\uff1a\u5148\u68c0\u67e5\u662f\u5426\u5df2\u7ecf\u88ab\u52a0\u8f7d\u8fc7\uff0c\u82e5\u6ca1\u6709\u52a0\u8f7d\u5219\u8c03\u7528\u7236\u52a0\u8f7d\u5668\u7684loadClass\u65b9\u6cd5\uff0c \u5982\u7236\u52a0\u8f7d\u5668\u4e3a\u7a7a\u5219\u9ed8\u8ba4\u4f7f\u7528\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u4f5c\u4e3a\u7236\u52a0\u8f7d\u5668\u3002\u5982\u679c\u7236\u7c7b\u52a0\u8f7d\u5931\u8d25\uff0c\u629b\u51faClassNotFoundException \u5f02\u5e38\u540e\uff0c\u518d\u8c03\u7528\u81ea\u5df1\u7684findClass\u65b9\u6cd5\u8fdb\u884c\u52a0\u8f7d\u3002<\/p><\/blockquote>\n<h2>3. \u5982\u4f55\u7834\u574f\u53cc\u4eb2\u59d4\u4efb\u6a21\u578b\uff1f<\/h2>\n<p>\u521a\u521a\u6211\u4eec\u8bf4\u8fc7\uff0c\u53cc\u4eb2\u59d4\u4efb\u6a21\u578b\u4e0d\u662f\u4e00\u4e2a\u5f3a\u5236\u6027\u7684\u7ea6\u675f\u6a21\u578b\uff0c\u800c\u662f\u4e00\u4e2a\u5efa\u8bae\u578b\u7684\u7c7b\u52a0\u8f7d\u5668\u5b9e\u73b0\u65b9\u5f0f\u3002\u5728Java\u7684\u4e16\u754c\u4e2d\u5927\u90e8\u5206\u7684\u7c7b\u52a0\u8f7d\u5668\u90fd\u9075\u5faa\u8005\u6a21\u578b\uff0c\u4f46\u4e5f\u6709\u4f8b\u5916\uff0c\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u6709\u8fc73\u6b21\u5927\u89c4\u6a21\u7684\u201c\u88ab\u7834\u574f\u201d\u7684\u60c5\u51b5\u3002<\/p>\n<p><strong>\u7b2c\u4e00\u6b21\uff1a\u5728\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u51fa\u73b0\u4e4b\u524d&#8212;&#8211;\u5373JDK1.2\u53d1\u5e03\u4e4b\u524d\u3002<\/strong><\/p>\n<p><strong>\u7b2c\u4e8c\u6b21\uff1a\u662f\u8fd9\u4e2a\u6a21\u578b\u81ea\u8eab\u7684\u7f3a\u9677\u5bfc\u81f4\u7684\u3002<\/strong> \u6211\u4eec\u8bf4\uff0c\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u5f88\u597d\u7684\u89e3\u51b3\u4e86\u5404\u4e2a\u7c7b\u52a0\u8f7d\u5668\u7684\u57fa\u7840\u7c7b\u7684\u7edf\u4e00\u95ee\u9898\uff08\u8d8a\u57fa\u7840\u7684\u7c7b\u7531\u8d8a\u4e0a\u5c42\u7684\u52a0\u8f7d\u5668\u8fdb\u884c\u52a0\u8f7d\uff09\uff0c\u57fa\u7840\u7c7b\u4e4b\u6240\u4ee5\u79f0\u4e3a\u201c\u57fa\u7840\u201d\uff0c\u662f\u56e0\u4e3a\u5b83\u4eec\u603b\u662f\u4f5c\u4e3a\u88ab\u7528\u6237\u4ee3\u7801\u8c03\u7528\u7684API\uff0c \u4f46\u6ca1\u6709\u7edd\u5bf9\uff0c\u5982\u679c\u57fa\u7840\u7c7b\u8c03\u7528\u4f1a\u7528\u6237\u7684\u4ee3\u7801\u600e\u4e48\u529e\u5462\uff1f<\/p>\n<p>\u8fd9\u4e0d\u662f\u6ca1\u6709\u53ef\u80fd\u7684\u3002\u4e00\u4e2a\u5178\u578b\u7684\u4f8b\u5b50\u5c31\u662fJNDI\u670d\u52a1\uff0cJNDI\u73b0\u5728\u5df2\u7ecf\u662fJava\u7684\u6807\u51c6\u670d\u52a1\uff0c\u5b83\u7684\u4ee3\u7801\u7531\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u53bb\u52a0\u8f7d\uff08\u5728JDK1.3\u65f6\u5c31\u653e\u8fdb\u53bb\u7684rt.jar\uff09,\u4f46\u5b83\u9700\u8981\u8c03\u7528\u7531\u72ec\u7acb\u5382\u5546\u5b9e\u73b0\u5e76\u90e8\u7f72\u5728\u5e94\u7528\u7a0b\u5e8f\u7684ClassPath\u4e0b\u7684JNDI\u63a5\u53e3\u63d0\u4f9b\u8005\uff08SPI\uff0c Service Provider Interface\uff09\u7684\u4ee3\u7801\uff0c\u4f46\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u4e0d\u53ef\u80fd\u201c\u8ba4\u8bc6\u201c\u8fd9\u4e9b\u4ee3\u7801\u554a\u3002\u56e0\u4e3a\u8fd9\u4e9b\u7c7b\u4e0d\u5728<code>rt.jar<\/code>\u4e2d\uff0c\u4f46\u662f\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u53c8\u9700\u8981\u52a0\u8f7d\u3002\u600e\u4e48\u529e\u5462\uff1f<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cJava\u8bbe\u8ba1\u56e2\u961f\u53ea\u597d\u5f15\u5165\u4e86\u4e00\u4e2a\u4e0d\u592a\u4f18\u96c5\u7684\u8bbe\u8ba1\uff1a\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u7c7b\u52a0\u8f7d\u5668\uff08Thread Context ClassLoader\uff09\u3002\u8fd9\u4e2a\u7c7b\u52a0\u8f7d\u5668\u53ef\u4ee5\u901a\u8fc7<code>java.lang.Thread<\/code>\u7c7b\u7684setContextClassLoader\u65b9\u6cd5\u8fdb\u884c\u8bbe\u7f6e\u3002\u5982\u679c\u521b\u5efa\u7ebf\u7a0b\u65f6\u8fd8\u672a\u8bbe\u7f6e\uff0c\u5b83\u5c06\u4f1a\u4ece\u7236\u7ebf\u7a0b\u4e2d\u7ee7\u627f\u4e00\u4e2a\uff0c\u5982\u679c\u5728\u5e94\u7528\u7a0b\u5e8f\u7684\u5168\u5c40\u8303\u56f4\u5185\u90fd\u6ca1\u6709\u8bbe\u7f6e\u8fc7\u591a\u7684\u8bdd\uff0c\u90a3\u8fd9\u4e2a\u7c7b\u52a0\u8f7d\u5668\u9ed8\u8ba4\u5373\u4f7f\u5e94\u7528\u7a0b\u5e8f\u7c7b\u52a0\u8f7d\u5668\u3002<\/p>\n<p>\u563f\u563f\uff0c\u6709\u4e86\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u52a0\u8f7d\u5668\uff0cJNDI\u670d\u52a1\u4f7f\u7528\u8fd9\u4e2a\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u52a0\u8f7d\u5668\u53bb\u52a0\u8f7d\u6240\u9700\u8981\u7684SPI\u4ee3\u7801\uff0c\u4e5f\u5c31\u662f\u7236\u7c7b\u52a0\u8f7d\u5668\u8bf7\u6c42\u5b50\u7c7b\u52a0\u8f7d\u5668\u53bb\u5b8c\u6210\u7c7b\u52a0\u8f7d\u7684\u52a8\u4f5c\uff0c\u8fd9\u79cd\u884c\u4e3a\u5b9e\u9645\u4e0a\u5c31\u662f\u6253\u901a\u4e86\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u7684\u5c42\u6b21\u7ed3\u6784\u6765\u9006\u5411\u4f7f\u7528\u7c7b\u52a0\u8f7d\u5668\uff0c\u5b9e\u9645\u4e0a\u5df2\u7ecf\u8fdd\u80cc\u4e86\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u7684\u4e00\u822c\u6027\u539f\u5219\u3002\u4f46\u8fd9\u65e0\u53ef\u5948\u4f55\uff0cJava\u4e2d\u6240\u6709\u6d89\u53caSPI\u7684\u52a0\u8f7d\u52a8\u4f5c\u57fa\u672c\u80dc\u90fd\u91c7\u7528\u8fd9\u79cd\u65b9\u5f0f\u3002\u4f8b\u5982JNDI\uff0cJDBC\uff0cJCE\uff0cJAXB\uff0cJBI\u7b49\u3002<\/p>\n<p><strong>\u7b2c\u4e09\u6b21\uff1a\u4e3a\u4e86\u5b9e\u73b0\u70ed\u63d2\u62d4\uff0c\u70ed\u90e8\u7f72\uff0c\u6a21\u5757\u5316\uff0c\u610f\u601d\u662f\u6dfb\u52a0\u4e00\u4e2a\u529f\u80fd\u6216\u51cf\u53bb\u4e00\u4e2a\u529f\u80fd\u4e0d\u7528\u91cd\u542f\uff0c\u53ea\u9700\u8981\u628a\u8fd9\u6a21\u5757\u8fde\u540c\u7c7b\u52a0\u8f7d\u5668\u4e00\u8d77\u6362\u6389\u5c31\u5b9e\u73b0\u4e86\u4ee3\u7801\u7684\u70ed\u66ff\u6362\u3002<\/strong><\/p>\n<p>\u4e66\u4e2d\u8fd8\u8bf4\u5230\uff1a<\/p>\n<p>Java \u7a0b\u5e8f\u4e2d\u57fa\u672c\u6709\u4e00\u4e2a\u5171\u8bc6\uff1aOSGI\u5bf9\u7c7b\u52a0\u8f7d\u5668\u7684\u4f7f\u7528\u65f6\u503c\u5f97\u5b66\u4e60\u7684\uff0c\u5f04\u61c2\u4e86OSGI\u7684\u5b9e\u73b0\uff0c\u5c31\u53ef\u4ee5\u7b97\u662f\u638c\u63e1\u4e86\u7c7b\u52a0\u8f7d\u5668\u7684\u7cbe\u9ad3\u3002<\/p>\n<p>\u725b\u903c\u554a\uff01\uff01\uff01<\/p>\n<p>\u73b0\u5728\uff0c\u6211\u4eec\u5df2\u7ecf\u57fa\u672c\u660e\u767d\u4e86Java\u9ed8\u8ba4\u7684\u7c7b\u52a0\u8f7d\u7684\u4f5c\u7528\u4e86\u539f\u7406\uff0c\u4e5f\u77e5\u9053\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u3002\u8bf4\u4e86\u8fd9\u4e48\u591a\uff0c\u5dee\u70b9\u628a\u6211\u4eec\u7684tomcat\u7ed9\u5fd8\u4e86\uff0c\u6211\u4eec\u7684\u9898\u76ee\u662fTomcat \u52a0\u8f7d\u5668\u4e3a\u4f55\u8fdd\u80cc\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\uff1f\u4e0b\u9762\u5c31\u597d\u597d\u8bf4\u8bf4\u6211\u4eec\u7684tomcat\u7684\u7c7b\u52a0\u8f7d\u5668\u3002<\/p>\n<p><strong>4. Tomcat \u7684\u7c7b\u52a0\u8f7d\u5668\u662f\u600e\u4e48\u8bbe\u8ba1\u7684\uff1f<\/strong><\/p>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u6765\u95ee\u4e2a\u95ee\u9898\uff1a<\/p>\n<p><strong>Tomcat \u5982\u679c\u4f7f\u7528\u9ed8\u8ba4\u7684\u7c7b\u52a0\u8f7d\u673a\u5236\u884c\u4e0d\u884c\uff1f<\/strong><\/p>\n<p>\u6211\u4eec\u601d\u8003\u4e00\u4e0b\uff1aTomcat\u662f\u4e2aweb\u5bb9\u5668\uff0c \u90a3\u4e48\u5b83\u8981\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898\uff1a<\/p>\n<ul>\n<li>\u4e00\u4e2aweb\u5bb9\u5668\u53ef\u80fd\u9700\u8981\u90e8\u7f72\u4e24\u4e2a\u5e94\u7528\u7a0b\u5e8f\uff0c\u4e0d\u540c\u7684\u5e94\u7528\u7a0b\u5e8f\u53ef\u80fd\u4f1a\u4f9d\u8d56\u540c\u4e00\u4e2a\u7b2c\u4e09\u65b9\u7c7b\u5e93\u7684\u4e0d\u540c\u7248\u672c\uff0c\u4e0d\u80fd\u8981\u6c42\u540c\u4e00\u4e2a\u7c7b\u5e93\u5728\u540c\u4e00\u4e2a\u670d\u52a1\u5668\u53ea\u6709\u4e00\u4efd\uff0c\u56e0\u6b64\u8981\u4fdd\u8bc1\u6bcf\u4e2a\u5e94\u7528\u7a0b\u5e8f\u7684\u7c7b\u5e93\u90fd\u662f\u72ec\u7acb\u7684\uff0c\u4fdd\u8bc1\u76f8\u4e92\u9694\u79bb\u3002<\/li>\n<li>\u90e8\u7f72\u5728\u540c\u4e00\u4e2aweb\u5bb9\u5668\u4e2d\u76f8\u540c\u7684\u7c7b\u5e93\u76f8\u540c\u7684\u7248\u672c\u53ef\u4ee5\u5171\u4eab\u3002\u5426\u5219\uff0c\u5982\u679c\u670d\u52a1\u5668\u670910\u4e2a\u5e94\u7528\u7a0b\u5e8f\uff0c\u90a3\u4e48\u8981\u670910\u4efd\u76f8\u540c\u7684\u7c7b\u5e93\u52a0\u8f7d\u8fdb\u865a\u62df\u673a\uff0c\u8fd9\u662f\u626f\u6de1\u7684\u3002<\/li>\n<li>web\u5bb9\u5668\u4e5f\u6709\u81ea\u5df1\u4f9d\u8d56\u7684\u7c7b\u5e93\uff0c\u4e0d\u80fd\u4e8e\u5e94\u7528\u7a0b\u5e8f\u7684\u7c7b\u5e93\u6df7\u6dc6\u3002\u57fa\u4e8e\u5b89\u5168\u8003\u8651\uff0c\u5e94\u8be5\u8ba9\u5bb9\u5668\u7684\u7c7b\u5e93\u548c\u7a0b\u5e8f\u7684\u7c7b\u5e93\u9694\u79bb\u5f00\u6765\u3002<\/li>\n<li>web\u5bb9\u5668\u8981\u652f\u6301jsp\u7684\u4fee\u6539\uff0c\u6211\u4eec\u77e5\u9053\uff0cjsp \u6587\u4ef6\u6700\u7ec8\u4e5f\u662f\u8981\u7f16\u8bd1\u6210class\u6587\u4ef6\u624d\u80fd\u5728\u865a\u62df\u673a\u4e2d\u8fd0\u884c\uff0c\u4f46\u7a0b\u5e8f\u8fd0\u884c\u540e\u4fee\u6539jsp\u5df2\u7ecf\u662f\u53f8\u7a7a\u89c1\u60ef\u7684\u4e8b\u60c5\uff0c\u5426\u5219\u8981\u4f60\u4f55\u7528\uff1f\u6240\u4ee5\uff0cweb\u5bb9\u5668\u9700\u8981\u652f\u6301 jsp \u4fee\u6539\u540e\u4e0d\u7528\u91cd\u542f\u3002<\/li>\n<\/ul>\n<p><strong>\u518d\u770b\u770b\u6211\u4eec\u7684\u95ee\u9898\uff1aTomcat \u5982\u679c\u4f7f\u7528\u9ed8\u8ba4\u7684\u7c7b\u52a0\u8f7d\u673a\u5236\u884c\u4e0d\u884c\uff1f<\/strong><\/p>\n<p>\u7b54\u6848\u662f\u4e0d\u884c\u7684\u3002\u4e3a\u4ec0\u4e48\uff1f\u6211\u4eec\u770b\uff0c\u7b2c\u4e00\u4e2a\u95ee\u9898\uff0c\u5982\u679c\u4f7f\u7528\u9ed8\u8ba4\u7684\u7c7b\u52a0\u8f7d\u5668\u673a\u5236\uff0c\u90a3\u4e48\u662f\u65e0\u6cd5\u52a0\u8f7d\u4e24\u4e2a\u76f8\u540c\u7c7b\u5e93\u7684\u4e0d\u540c\u7248\u672c\u7684\uff0c\u9ed8\u8ba4\u7684\u7d2f\u52a0\u5668\u662f\u4e0d\u7ba1\u4f60\u662f\u4ec0\u4e48\u7248\u672c\u7684\uff0c\u53ea\u5728\u4e4e\u4f60\u7684\u5168\u9650\u5b9a\u7c7b\u540d\uff0c\u5e76\u4e14\u53ea\u6709\u4e00\u4efd\u3002<\/p>\n<p>\u7b2c\u4e8c\u4e2a\u95ee\u9898\uff0c\u9ed8\u8ba4\u7684\u7c7b\u52a0\u8f7d\u5668\u662f\u80fd\u591f\u5b9e\u73b0\u7684\uff0c\u56e0\u4e3a\u4ed6\u7684\u804c\u8d23\u5c31\u662f\u4fdd\u8bc1\u552f\u4e00\u6027\u3002\u7b2c\u4e09\u4e2a\u95ee\u9898\u548c\u7b2c\u4e00\u4e2a\u95ee\u9898\u4e00\u6837\u3002\u6211\u4eec\u518d\u770b\u7b2c\u56db\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u60f3\u6211\u4eec\u8981\u600e\u4e48\u5b9e\u73b0jsp\u6587\u4ef6\u7684\u70ed\u4fee\u6539\uff08\u697c\u4e3b\u8d77\u7684\u540d\u5b57\uff09\uff0cjsp \u6587\u4ef6\u5176\u5b9e\u4e5f\u5c31\u662fclass\u6587\u4ef6\uff0c\u90a3\u4e48\u5982\u679c\u4fee\u6539\u4e86\uff0c\u4f46\u7c7b\u540d\u8fd8\u662f\u4e00\u6837\uff0c\u7c7b\u52a0\u8f7d\u5668\u4f1a\u76f4\u63a5\u53d6\u65b9\u6cd5\u533a\u4e2d\u5df2\u7ecf\u5b58\u5728\u7684\uff0c\u4fee\u6539\u540e\u7684jsp\u662f\u4e0d\u4f1a\u91cd\u65b0\u52a0\u8f7d\u7684\u3002<\/p>\n<p>\u90a3\u4e48\u600e\u4e48\u529e\u5462\uff1f\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u5378\u8f7d\u6389\u8fd9jsp\u6587\u4ef6\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u6240\u4ee5\u4f60\u5e94\u8be5\u60f3\u5230\u4e86\uff0c\u6bcf\u4e2ajsp\u6587\u4ef6\u5bf9\u5e94\u4e00\u4e2a\u552f\u4e00\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u5f53\u4e00\u4e2ajsp\u6587\u4ef6\u4fee\u6539\u4e86\uff0c\u5c31\u76f4\u63a5\u5378\u8f7d\u8fd9\u4e2ajsp\u7c7b\u52a0\u8f7d\u5668\u3002\u91cd\u65b0\u521b\u5efa\u7c7b\u52a0\u8f7d\u5668\uff0c\u91cd\u65b0\u52a0\u8f7djsp\u6587\u4ef6\u3002<\/p>\n<h3>Tomcat \u5982\u4f55\u5b9e\u73b0\u81ea\u5df1\u72ec\u7279\u7684\u7c7b\u52a0\u8f7d\u673a\u5236\uff1f<\/h3>\n<p>\u6240\u4ee5\uff0cTomcat \u662f\u600e\u4e48\u5b9e\u73b0\u7684\u5462\uff1f\u725b\u903c\u7684Tomcat\u56e2\u961f\u5df2\u7ecf\u8bbe\u8ba1\u597d\u4e86\u3002\u6211\u4eec\u770b\u770b\u4ed6\u4eec\u7684\u8bbe\u8ba1\u56fe\uff1a<\/p>\n<p><img decoding=\"async\" width=\"462\" height=\"655\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc9xNX\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u6211\u4eec\u770b\u5230\uff0c\u524d\u97623\u4e2a\u7c7b\u52a0\u8f7d\u548c\u9ed8\u8ba4\u7684\u4e00\u81f4\uff0cCommonClassLoader\u3001CatalinaClassLoader\u3001SharedClassLoader\u548cWebappClassLoader\u5219\u662fTomcat\u81ea\u5df1\u5b9a\u4e49\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u5b83\u4eec\u5206\u522b\u52a0\u8f7d<code>\/common\/*<\/code>\u3001<code>\/server\/*<\/code>\u3001<code>\/shared\/*<\/code>\uff08\u5728tomcat 6\u4e4b\u540e\u5df2\u7ecf\u5408\u5e76\u5230\u6839\u76ee\u5f55\u4e0b\u7684lib\u76ee\u5f55\u4e0b\uff09\u548c<code>\/WebApp\/WEB-INF\/*<\/code>\u4e2d\u7684Java\u7c7b\u5e93\u3002\u5176\u4e2dWebApp\u7c7b\u52a0\u8f7d\u5668\u548cJsp\u7c7b\u52a0\u8f7d\u5668\u901a\u5e38\u4f1a\u5b58\u5728\u591a\u4e2a\u5b9e\u4f8b\uff0c\u6bcf\u4e00\u4e2aWeb\u5e94\u7528\u7a0b\u5e8f\u5bf9\u5e94\u4e00\u4e2aWebApp\u7c7b\u52a0\u8f7d\u5668\uff0c\u6bcf\u4e00\u4e2aJSP\u6587\u4ef6\u5bf9\u5e94\u4e00\u4e2aJsp\u7c7b\u52a0\u8f7d\u5668\u3002<\/p>\n<ul>\n<li><code>commonLoader<\/code>\uff1aTomcat\u6700\u57fa\u672c\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u52a0\u8f7d\u8def\u5f84\u4e2d\u7684class\u53ef\u4ee5\u88abTomcat\u5bb9\u5668\u672c\u8eab\u4ee5\u53ca\u5404\u4e2aWebapp\u8bbf\u95ee\uff1b<\/li>\n<li><code>catalinaLoader<\/code>\uff1aTomcat\u5bb9\u5668\u79c1\u6709\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u52a0\u8f7d\u8def\u5f84\u4e2d\u7684class\u5bf9\u4e8eWebapp\u4e0d\u53ef\u89c1\uff1b<\/li>\n<li><code>sharedLoader<\/code>\uff1a\u5404\u4e2aWebapp\u5171\u4eab\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u52a0\u8f7d\u8def\u5f84\u4e2d\u7684class\u5bf9\u4e8e\u6240\u6709Webapp\u53ef\u89c1\uff0c\u4f46\u662f\u5bf9\u4e8eTomcat\u5bb9\u5668\u4e0d\u53ef\u89c1\uff1b<\/li>\n<li><code>WebappClassLoader<\/code>\uff1a\u5404\u4e2aWebapp\u79c1\u6709\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u52a0\u8f7d\u8def\u5f84\u4e2d\u7684class\u53ea\u5bf9\u5f53\u524dWebapp\u53ef\u89c1\uff1b<\/li>\n<\/ul>\n<p>\u4ece\u56fe\u4e2d\u7684\u59d4\u6d3e\u5173\u7cfb\u4e2d\u53ef\u4ee5\u770b\u51fa\uff1a<\/p>\n<p>CommonClassLoader\u80fd\u52a0\u8f7d\u7684\u7c7b\u90fd\u53ef\u4ee5\u88abCatalina ClassLoader\u548cSharedClassLoader\u4f7f\u7528\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u516c\u6709\u7c7b\u5e93\u7684\u5171\u7528\uff0c\u800cCatalinaClassLoader\u548cShared ClassLoader\u81ea\u5df1\u80fd\u52a0\u8f7d\u7684\u7c7b\u5219\u4e0e\u5bf9\u65b9\u76f8\u4e92\u9694\u79bb\u3002<\/p>\n<p>WebAppClassLoader\u53ef\u4ee5\u4f7f\u7528SharedClassLoader\u52a0\u8f7d\u5230\u7684\u7c7b\uff0c\u4f46\u5404\u4e2aWebAppClassLoader\u5b9e\u4f8b\u4e4b\u95f4\u76f8\u4e92\u9694\u79bb\u3002<\/p>\n<p>\u800cJasperLoader\u7684\u52a0\u8f7d\u8303\u56f4\u4ec5\u4ec5\u662f\u8fd9\u4e2aJSP\u6587\u4ef6\u6240\u7f16\u8bd1\u51fa\u6765\u7684\u90a3\u4e00\u4e2a.Class\u6587\u4ef6\uff0c\u5b83\u51fa\u73b0\u7684\u76ee\u7684\u5c31\u662f\u4e3a\u4e86\u88ab\u4e22\u5f03\uff1a\u5f53Web\u5bb9\u5668\u68c0\u6d4b\u5230JSP\u6587\u4ef6\u88ab\u4fee\u6539\u65f6\uff0c\u4f1a\u66ff\u6362\u6389\u76ee\u524d\u7684JasperLoader\u7684\u5b9e\u4f8b\uff0c\u5e76\u901a\u8fc7\u518d\u5efa\u7acb\u4e00\u4e2a\u65b0\u7684Jsp\u7c7b\u52a0\u8f7d\u5668\u6765\u5b9e\u73b0JSP\u6587\u4ef6\u7684HotSwap\u529f\u80fd\u3002<\/p>\n<blockquote><p>\u597d\u4e86\uff0c\u81f3\u6b64\uff0c\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\u4e86tomcat\u4e3a\u4ec0\u4e48\u8981\u8fd9\u4e48\u8bbe\u8ba1\uff0c\u4ee5\u53ca\u662f\u5982\u4f55\u8bbe\u8ba1\u7684\uff0c\u90a3\u4e48\uff0ctomcat \u8fdd\u80cc\u4e86java \u63a8\u8350\u7684\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u4e86\u5417\uff1f\u7b54\u6848\u662f\uff1a\u8fdd\u80cc\u4e86\u3002<\/p><\/blockquote>\n<p>\u6211\u4eec\u524d\u9762\u8bf4\u8fc7\uff1a<\/p>\n<p>\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u8981\u6c42\u9664\u4e86\u9876\u5c42\u7684\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u4e4b\u5916\uff0c\u5176\u4f59\u7684\u7c7b\u52a0\u8f7d\u5668\u90fd\u5e94\u5f53\u7531\u81ea\u5df1\u7684\u7236\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u3002<\/p>\n<p>\u5f88\u663e\u7136\uff0ctomcat \u4e0d\u662f\u8fd9\u6837\u5b9e\u73b0\uff0ctomcat \u4e3a\u4e86\u5b9e\u73b0\u9694\u79bb\u6027\uff0c\u6ca1\u6709\u9075\u5b88\u8fd9\u4e2a\u7ea6\u5b9a\uff0c\u6bcf\u4e2awebappClassLoader\u52a0\u8f7d\u81ea\u5df1\u7684\u76ee\u5f55\u4e0b\u7684class\u6587\u4ef6\uff0c\u4e0d\u4f1a\u4f20\u9012\u7ed9\u7236\u7c7b\u52a0\u8f7d\u5668\u3002<\/p>\n<p>\u6211\u4eec\u6269\u5c55\u51fa\u4e00\u4e2a\u95ee\u9898\uff1a\u5982\u679ctomcat \u7684 Common ClassLoader \u60f3\u52a0\u8f7d WebApp ClassLoader \u4e2d\u7684\u7c7b\uff0c\u8be5\u600e\u4e48\u529e\uff1f\u770b\u4e86\u524d\u9762\u7684\u5173\u4e8e\u7834\u574f\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\u7684\u5185\u5bb9\uff0c\u6211\u4eec\u5fc3\u91cc\u6709\u6570\u4e86\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u7c7b\u52a0\u8f7d\u5668\u5b9e\u73b0\uff0c\u4f7f\u7528\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u52a0\u8f7d\u5668\uff0c\u53ef\u4ee5\u8ba9\u7236\u7c7b\u52a0\u8f7d\u5668\u8bf7\u6c42\u5b50\u7c7b\u52a0\u8f7d\u5668\u53bb\u5b8c\u6210\u7c7b\u52a0\u8f7d\u7684\u52a8\u4f5c\u3002\u725b\u903c\u5427\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u597d\u4e86\uff0c\u7ec8\u4e8e\uff0c\u6211\u4eec\u660e\u767d\u4e86Tomcat \u4e3a\u4f55\u8fdd\u80cc\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\uff0c\u4e5f\u77e5\u9053\u4e86tomcat\u7684\u7c7b\u52a0\u8f7d\u5668\u662f\u5982\u4f55\u8bbe\u8ba1\u7684\u3002\u987a\u4fbf\u590d\u4e60\u4e86\u4e00\u4e0b Java \u9ed8\u8ba4\u7684\u7c7b\u52a0\u8f7d\u5668\u673a\u5236\uff0c\u4e5f\u77e5\u9053\u4e86\u5982\u4f55\u7834\u574fJava\u7684\u7c7b\u52a0\u8f7d\u673a\u5236\u3002\u8fd9\u4e00\u6b21\u6536\u83b7\u4e0d\u5c0f\u54e6\uff01\uff01\uff01\u563f\u563f\u3002<\/p>\n<p><strong>\u8fd1\u671f\u70ed\u6587\u63a8\u8350\uff1a<\/strong><\/p>\n<p>1.<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=SSTrxeNeG7uxn7P7ScA21A%3D%3D.ABhY8OmjRGuiT5Osg2nXdiUpAl3R6aZiu5ft3g2PScA%3D\" rel=\"noopener noreferrer\">1,000+ \u9053 Java\u9762\u8bd5\u9898\u53ca\u7b54\u6848\u6574\u7406(2022\u6700\u65b0\u7248)<\/a><\/p>\n<p>2.<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=hp50zCRiZPmZ5Tt8sFrJmQ%3D%3D.1jpphoGvoSMyiNm9P7sfWVYqjyj6r8PeSyS07UWbxjnhbg%2FLRhdYizHfu%2FaAxDgzhwKQiZB1ClEGl0Y2fJN0Nw%3D%3D\" rel=\"noopener noreferrer\">\u52b2\u7206\uff01Java \u534f\u7a0b\u8981\u6765\u4e86\u3002\u3002\u3002<\/a><\/p>\n<p>3.<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=PzXXVr6OaUBGFg6Oj5bPbg%3D%3D.baisFtgt35Q%2BYcdj%2BtdRSO66WRu20e9rYbGEKEZ5ZI%2BB4yJQh9LXDIHG2p22s7k0\" rel=\"noopener noreferrer\">Spring Boot 2.x \u6559\u7a0b\uff0c\u592a\u5168\u4e86\uff01<\/a><\/p>\n<p>4.<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=tjygTM8FmlilcSg7ZLHIFg%3D%3D.otTxLlN%2F1P4ORBKpy6w24hsq4WxJ8nk%2B3qTG49NMKGzQDQnKjxuyM10v3CfR%2FlkJmAyKUJquS%2FBWVbCnsfAxRA%3D%3D\" rel=\"noopener noreferrer\">\u522b\u518d\u5199\u6ee1\u5c4f\u7684\u7206\u7206\u7206\u70b8\u7c7b\u4e86\uff0c\u8bd5\u8bd5\u88c5\u9970\u5668\u6a21\u5f0f\uff0c\u8fd9\u624d\u662f\u4f18\u96c5\u7684\u65b9\u5f0f\uff01\uff01<\/a><\/p>\n<p>5.<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=pgdnDDMW9%2BsSHNWVQTzxqQ%3D%3D.0SzqW%2BYkw0ERfIfOnTDS8fxlGHl28z9Uz%2BKUSmA0JoG675gvioasQ5EwR0QAKNi9x4yI5xwSLBDRtN4IqL%2F%2FTUJ1toVLEMcYzP4pbebdISs%3D\" rel=\"noopener noreferrer\">\u300aJava\u5f00\u53d1\u624b\u518c\uff08\u5d69\u5c71\u7248\uff09\u300b\u6700\u65b0\u53d1\u5e03\uff0c\u901f\u901f\u4e0b\u8f7d\uff01<\/a><\/p>\n<p>\u89c9\u5f97\u4e0d\u9519\uff0c\u522b\u5fd8\u4e86\u968f\u624b\u70b9\u8d5e+\u8f6c\u53d1\u54e6\uff01<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044181560\">https:\/\/segmentfault.com\/a\/1190000044181560<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6765\u6e90\uff1awww.jianshu.com\/p \/abf6fd4531e7 \u6211\u60f3\uff0c\u5728\u7814\u7a76tomcat \u7c7b\u52a0\u8f7d\u4e4b\u524d\uff0c\u6211 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