{"id":275,"date":"2024-10-03T21:04:32","date_gmt":"2024-10-03T13:04:32","guid":{"rendered":"https:\/\/www.zackzzp.top\/?p=275"},"modified":"2024-10-03T21:04:33","modified_gmt":"2024-10-03T13:04:33","slug":"%e4%b8%80%e6%96%87%e7%90%86%e8%a7%a3jvm%e5%8f%8c%e4%ba%b2%e5%a7%94%e6%b4%be%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"http:\/\/www.zackzzp.top\/index.php\/2024\/10\/03\/%e4%b8%80%e6%96%87%e7%90%86%e8%a7%a3jvm%e5%8f%8c%e4%ba%b2%e5%a7%94%e6%b4%be%e6%9c%ba%e5%88%b6\/","title":{"rendered":"\u4e00\u6587\u7406\u89e3JVM\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236"},"content":{"rendered":"<h2>\u4ec0\u4e48\u662f\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236<\/h2>\n<p>\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\uff08Parent Delegation 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has-alpha-channel-opacity\"\/>\n\n\n<h2>\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u5e94\u7528\u573a\u666f<\/h2>\n<p>\u00a0<\/p>\n<p>\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u5728Java\u4e2d\u6709\u591a\u79cd\u5e94\u7528\u573a\u666f\u3002\u4e00\u4e9b\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u7c7b\u52a0\u8f7d\uff1a\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u4e3b\u8981\u7528\u4e8eJava\u4e2d\u7684\u7c7b\u52a0\u8f7d\u3002\u5b83\u786e\u4fdd\u7c7b\u4ee5\u5c42\u6b21\u7ed3\u6784\u65b9\u5f0f\u52a0\u8f7d\uff0c\u4ece\u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668\u5f00\u59cb\uff0c\u7136\u540e\u662f\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\uff0c\u6700\u540e\u662f\u5e94\u7528\u7a0b\u5e8f\u7c7b\u52a0\u8f7d\u5668\u3002\u8fd9\u6837\u53ef\u4ee5\u9ad8\u6548\u4e14\u4e00\u81f4\u5730\u52a0\u8f7d\u7c7b\uff0c\u8de8\u7c7b\u52a0\u8f7d\u5668\u5c42\u6b21\u7ed3\u6784\u3002<\/li>\n<li>\u5b89\u5168\u6027\uff1a\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u5728\u786e\u4fddJava\u5e94\u7528\u7a0b\u5e8f\u7684\u5b89\u5168\u6027\u65b9\u9762\u8d77\u7740\u91cd\u8981\u4f5c\u7528\u3002\u901a\u8fc7\u59d4\u6d3e\u7c7b\u52a0\u8f7d\u7ed9\u7236\u52a0\u8f7d\u5668\uff0c\u5b83\u53ef\u4ee5\u9632\u6b62\u672a\u7ecf\u6388\u6743\u6216\u6076\u610f\u4ee3\u7801\u7684\u52a0\u8f7d\u548c\u6267\u884c\u3002\u8fd9\u6709\u52a9\u4e8e\u7ef4\u62a4Java\u8fd0\u884c\u65f6\u73af\u5883\u7684\u5b8c\u6574\u6027\u548c\u5b89\u5168\u6027\u3002<\/li>\n<li>\u7c7b\u5e93\uff1a\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u5bf9\u4e8e\u52a0\u8f7d\u548c\u7ba1\u7406\u7c7b\u5e93\u975e\u5e38\u6709\u7528\u3002\u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668\u4f4d\u4e8e\u5c42\u6b21\u7ed3\u6784\u7684\u9876\u90e8\uff0c\u8d1f\u8d23\u52a0\u8f7d\u6838\u5fc3Java\u7c7b\u3002\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\u8d1f\u8d23\u4eceJava\u6269\u5c55\u76ee\u5f55\u52a0\u8f7d\u7c7b\u3002\u5e94\u7528\u7a0b\u5e8f\u7c7b\u52a0\u8f7d\u5668\u8d1f\u8d23\u4ece\u5e94\u7528\u7a0b\u5e8f\u7684\u7c7b\u8def\u5f84\u52a0\u8f7d\u7c7b\u3002\u8fd9\u79cd\u5206\u79bb\u5141\u8bb8\u9ad8\u6548\u7ec4\u7ec7\u548c\u7ba1\u7406\u7c7b\u5e93\u3002<\/li>\n<li>\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\uff1a\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u5229\u7528\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u5b9e\u73b0\u5177\u6709\u7279\u5b9a\u52a0\u8f7d\u884c\u4e3a\u7684\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u3002\u901a\u8fc7\u6269\u5c55\u73b0\u6709\u7684\u7c7b\u52a0\u8f7d\u5668\u5e76\u91cd\u5199\u7c7b\u52a0\u8f7d\u8fc7\u7a0b\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u5f15\u5165\u81ea\u5b9a\u4e49\u903b\u8f91\uff0c\u4ece\u975e\u6807\u51c6\u4f4d\u7f6e\u52a0\u8f7d\u7c7b\u6216\u5bf9\u52a0\u8f7d\u7684\u7c7b\u5e94\u7528\u81ea\u5b9a\u4e49\u8f6c\u6362\u3002<\/li>\n<\/ul>\n<p>\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u5728Java\u4e2d\u5e7f\u6cdb\u5e94\u7528\u4e8e\u7c7b\u52a0\u8f7d\u3001\u5b89\u5168\u6027\u5f3a\u5236\u6267\u884c\u548c\u7c7b\u5e93\u7ba1\u7406\u7b49\u65b9\u9762\uff0c\u4e3aJava\u5e94\u7528\u7a0b\u5e8f\u63d0\u4f9b\u4e86\u7ed3\u6784\u5316\u548c\u5b89\u5168\u7684\u73af\u5883\u3002<\/p>\n<hr \/>\n<h2>\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u539f\u7406<\/h2>\n<p>\u00a0<\/p>\n<p>\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u662fJava\u4e2d\u7684\u4e00\u79cd\u7c7b\u52a0\u8f7d\u673a\u5236\u3002\u5176\u539f\u7406\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u5f53Java\u7a0b\u5e8f\u9700\u8981\u52a0\u8f7d\u4e00\u4e2a\u7c7b\u65f6\uff0c\u9996\u5148\u4f1a\u59d4\u6258\u7ed9\u5f53\u524d\u7c7b\u52a0\u8f7d\u5668\u7684\u7236\u7c7b\u52a0\u8f7d\u5668\u8fdb\u884c\u52a0\u8f7d\u3002<\/li>\n<li>\u7236\u7c7b\u52a0\u8f7d\u5668\u4f1a\u6309\u7167\u76f8\u540c\u7684\u65b9\u5f0f\u5c1d\u8bd5\u52a0\u8f7d\u8be5\u7c7b\u3002\u5982\u679c\u7236\u7c7b\u52a0\u8f7d\u5668\u80fd\u591f\u6210\u529f\u52a0\u8f7d\u8be5\u7c7b\uff0c\u5219\u52a0\u8f7d\u8fc7\u7a0b\u7ed3\u675f\u3002<\/li>\n<li>\u5982\u679c\u7236\u7c7b\u52a0\u8f7d\u5668\u65e0\u6cd5\u52a0\u8f7d\u8be5\u7c7b\uff0c\u5219\u4f1a\u5c06\u52a0\u8f7d\u8bf7\u6c42\u518d\u6b21\u59d4\u6258\u7ed9\u5b83\u7684\u7236\u7c7b\u52a0\u8f7d\u5668\uff0c\u76f4\u5230\u8fbe\u5230\u9876\u5c42\u7684\u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668\u3002<\/li>\n<li>\u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668\u662fJava\u865a\u62df\u673a\u5185\u7f6e\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u5b83\u8d1f\u8d23\u52a0\u8f7d\u6838\u5fc3\u7c7b\u5e93\uff0c\u5982java.lang\u5305\u4e0b\u7684\u7c7b\u3002<\/li>\n<li>\u5982\u679c\u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668\u4e5f\u65e0\u6cd5\u52a0\u8f7d\u8be5\u7c7b\uff0c\u5219\u4f1a\u56de\u5230\u521d\u59cb\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u5c1d\u8bd5\u4f7f\u7528\u81ea\u8eab\u7684\u52a0\u8f7d\u673a\u5236\u52a0\u8f7d\u8be5\u7c7b\u3002<\/li>\n<li>\u5982\u679c\u81ea\u8eab\u7684\u52a0\u8f7d\u673a\u5236\u4ecd\u7136\u65e0\u6cd5\u52a0\u8f7d\u8be5\u7c7b\uff0c\u5219\u4f1a\u629b\u51faClassNotFoundException\u5f02\u5e38\u3002<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u8fd9\u79cd\u53cc\u4eb2\u59d4\u6d3e\u7684\u673a\u5236\uff0cJava\u5b9e\u73b0\u4e86\u7c7b\u52a0\u8f7d\u7684\u5c42\u6b21\u7ed3\u6784\u3002\u5b83\u53ef\u4ee5\u786e\u4fdd\u7c7b\u7684\u52a0\u8f7d\u662f\u6709\u5e8f\u7684\uff0c\u907f\u514d\u4e86\u91cd\u590d\u52a0\u8f7d\u548c\u7c7b\u7684\u51b2\u7a81\u3002\u540c\u65f6\uff0c\u5b83\u4e5f\u63d0\u4f9b\u4e86\u4e00\u79cd\u5b89\u5168\u673a\u5236\uff0c\u9632\u6b62\u6076\u610f\u4ee3\u7801\u7684\u52a0\u8f7d\u548c\u6267\u884c\u3002<\/p>\n<hr \/>\n<h2>\u4e3a\u4ec0\u4e48\u8981\u6253\u7834\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u4ee5\u53ca\u5982\u4f55\u6253\u7834<\/h2>\n<p>\u00a0<\/p>\n<ol>\n<li>\n<h3>\u4e3a\u4ec0\u4e48\u8981\u6253\u7834<\/h3>\n<p>\u6709\u65f6\u6211\u4eec\u9700\u8981\u591a\u6b21\u52a0\u8f7d\u540c\u540d\u76ee\u5f55\u4e0b\u7684\u7c7b\uff0c\u6bd4\u5982\uff1a\u5f53\u6211\u4eec\u5728Tomcat\u4e0a\u90e8\u7f72\u591a\u4e2a\u670d\u52a1\u65f6\uff0c\u4e0d\u540c\u670d\u52a1\u4e0a\u53ef\u80fd\u4f9d\u8d56\u4e86\u4e0d\u540c\u7248\u672c\u7684\u7b2c\u4e09\u65b9jar\uff0c\u5982\u679c\u6b64\u65f6\u4f7f\u7528\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u52a0\u8f7d\u7c7b\uff0c\u4f1a\u5bfc\u81f4\u591a\u4e2a\u670d\u52a1\u4e2d\u7b2c\u4e09\u65b9jar\u53ea\u52a0\u8f7d\u4e00\u6b21\uff0c\u5176\u4ed6\u670d\u52a1\u4e2d\u7684\u5176\u4ed6\u7248\u672cjar\u5c06\u4e0d\u4f1a\u751f\u6548\uff0c\u5bfc\u81f4\u8bf7\u6c42\u7ed3\u679c\u5f02\u5e38\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u9700\u8981\u6253\u7834\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\uff0c\u4e0d\u518d\u8ba9\u7236\u7c7b[\u5e94\u7528\u7c7b\u52a0\u8f7d\u5668]\u52a0\u8f7d\uff0c\u800c\u662f\u4e3a\u6bcf\u4e2a\u670d\u52a1\u521b\u5efa\u81ea\u5df1\u7684\u5b50\u7c7b\u52a0\u8f7d\u5668\u3002<\/p>\n<\/li>\n<li>\n<h3>\u5982\u4f55\u6253\u7834<\/h3>\n<p>\u8981\u6253\u7834\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\uff0c\u53ef\u4ee5\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\uff0c\u5e76<strong>\u91cd\u5199 ClassLoader \u7c7b\u4e2d\u7684 loadClass(String name, boolean resolve) \u65b9\u6cd5\uff08\u6216\u8005\u662f findClass(String name) \u65b9\u6cd5\uff0c\u6839\u636e\u5177\u4f53\u9700\u6c42\uff09\u3002<\/strong>\u81ea\u5b9a\u4e49\u7684\u7c7b\u52a0\u8f7d\u5668\u53ef\u4ee5\u5148\u5c1d\u8bd5\u52a0\u8f7d\u7c7b\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u59d4\u6d3e\u7ed9\u7236\u52a0\u8f7d\u5668\u3002<\/p>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5316\u7684\u793a\u4f8b\uff0c\u8bf4\u660e\u5982\u4f55\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u4ee5\u6253\u7834\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\uff1a<\/p>\n<p>public class CustomClassLoader extends ClassLoader {<\/p>\n<p>@Override<br \/>public Class&lt;?&gt; loadClass(String name) throws ClassNotFoundException {<br \/>\/\/ \u9996\u5148, \u68c0\u67e5\u8bf7\u6c42\u7684\u7c7b\u662f\u5426\u5df2\u7ecf\u88ab\u52a0\u8f7d<br \/>Class&lt;?&gt; c = findLoadedClass(name);<br \/>if (c == null) {<br \/>try {<br \/>\/\/ \u5c1d\u8bd5\u81ea\u5df1\u52a0\u8f7d\u7c7b\uff0c\u800c\u4e0d\u662f\u59d4\u6d3e\u7ed9\u7236\u7c7b\u52a0\u8f7d\u5668<br \/>c = findClass(name);<br \/>} catch (ClassNotFoundException e) {<br \/>\/\/ \u5982\u679c\u81ea\u5df1\u65e0\u6cd5\u52a0\u8f7d\u7c7b\uff0c\u90a3\u4e48\u8c03\u7528\u7236\u7c7b\u52a0\u8f7d\u5668\u5c1d\u8bd5\u52a0\u8f7d<br \/>c = super.loadClass(name);<br \/>}<br \/>}<br \/>return c;<br \/>}<\/p>\n<p>@Override<br \/>protected Class&lt;?&gt; findClass(String name) throws ClassNotFoundException {<br \/>\/\/ \u5728\u8fd9\u91cc\u52a0\u5165\u5177\u4f53\u7684\u7c7b\u52a0\u8f7d\u903b\u8f91\uff0c\u6bd4\u5982\u4ece\u6587\u4ef6\u7cfb\u7edf\u4e2d\u8bfb\u53d6.class\u6587\u4ef6\u7684\u5b57\u8282\u6d41<br \/>\/\/ byte[] classBytes = &#8230;;<br \/>\/\/ return defineClass(name, classBytes, 0, classBytes.length);<br \/><br \/>\/\/ \u793a\u4f8b\u4e2d\u6ca1\u6709\u5177\u4f53\u5b9e\u73b0\uff0c\u56e0\u4e3a\u5b83\u901a\u5e38\u9700\u8981\u8bfb\u53d6\u6587\u4ef6\u6216\u5176\u4ed6\u6570\u636e\u6e90\u4e2d\u7684\u7c7b\u6570\u636e<br \/>throw new ClassNotFoundException();<br \/>}<br \/>}<br \/><br \/>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cfindClass(String name) \u65b9\u6cd5\u88ab\u91cd\u5199\u7528\u4e8e\u5c1d\u8bd5\u52a0\u8f7d\u7c7b\u3002\u5982\u679c\u5728 findClass \u4e2d\u6ca1\u6709\u627e\u5230\u7c7b\uff0c\u5219\u4f1a\u629b\u51fa ClassNotFoundException 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