{"id":879,"date":"2023-10-05T15:15:06","date_gmt":"2023-08-26T01:57:36","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-%e7%b1%bb%e5%8a%a0%e8%bd%bd%e5%99%a8\/"},"modified":"2025-08-03T14:44:40","modified_gmt":"2025-08-03T06:44:40","slug":"java-%e7%b1%bb%e5%8a%a0%e8%bd%bd%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e7%b1%bb%e5%8a%a0%e8%bd%bd%e5%99%a8\/","title":{"rendered":"Java\u7c7b\u52a0\u8f7d\u5668\u6df1\u5165\u89e3\u6790\uff1a\u539f\u7406\u3001\u673a\u5236\u4e0e\u5b9e\u8df5\u6307\u5357"},"content":{"rendered":"

\u8fd9\u662f\u6587\u7ae0\u300aJava \u7c7b\u52a0\u8f7d\u5668\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n

\u5185\u5bb9\u7247\u6bb5\uff1aJava ClassLoader\u662f\u9879\u76ee\u5f00\u53d1\u4e2d\u81f3\u5173\u91cd\u8981\u4f46\u5f88\u5c11\u88ab\u76f4\u63a5\u4f7f\u7528\u7684\u7ec4\u4ef6\u4e4b\u4e00\u3002\u6211\u4ece\u672a\u5728\u6211\u7684\u4efb\u4f55\u9879\u76ee\u4e2d\u6269\u5c55\u8fc7ClassLoader\u3002\u7136\u800c\uff0c\u62e5\u6709\u80fd\u591f\u81ea\u5b9a\u4e49Java\u7c7b\u52a0\u8f7d\u673a\u5236\u7684\u81ea\u5df1\u7684ClassLoader\u7684\u60f3\u6cd5\u4ee4\u4eba\u5174\u594b\u3002\u672c\u6587\u5c06\u6982\u8ff0Java ClassLoader\u7684\u57fa\u672c\u6982\u5ff5\uff0c\u7136\u540e\u7ee7\u7eed\u4ecb\u7ecd\u5982\u4f55\u5728Java\u4e2d\u521b\u5efa\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u3002<\/p>\n

Java ClassLoader\u662f\u4ec0\u4e48\uff1f<\/h2>\n

\u6211\u4eec\u77e5\u9053\uff0cJava\u7a0b\u5e8f\u8fd0\u884c\u5728Java\u865a\u62df\u673a\uff08JVM\uff09\u4e0a\u3002\u5f53\u6211\u4eec\u7f16\u8bd1\u4e00\u4e2aJava\u7c7b\u65f6\uff0cJVM\u4f1a\u521b\u5efa\u5b57\u8282\u7801\uff0c\u8fd9\u662f\u4e0e\u5e73\u53f0\u548c\u673a\u5668\u65e0\u5173\u7684\u4e2d\u95f4\u4ee3\u7801\u3002\u5b57\u8282\u7801\u5b58\u50a8\u5728\u4e00\u4e2a.class\u6587\u4ef6\u4e2d\u3002\u5f53\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528\u4e00\u4e2a\u7c7b\u65f6\uff0c\u7c7b\u52a0\u8f7d\u5668\u8d1f\u8d23\u5c06\u5176\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n

\u5185\u7f6e\u7684ClassLoader\u7c7b\u578b<\/h2>\n

Java\u4e2d\u6709\u4e09\u79cd\u7c7b\u578b\u7684\u5185\u7f6eClassLoader\uff1a<\/p>\n

    \n
  1. \u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\uff08Bootstrap ClassLoader\uff09<\/strong> – \u5b83\u52a0\u8f7dJDK\u5185\u90e8\u7684\u7c7b\u3002\u5b83\u52a0\u8f7drt.jar\u548c\u5176\u4ed6\u6838\u5fc3\u7c7b\uff0c\u4f8b\u5982java.lang.*\u5305\u4e2d\u7684\u7c7b\u3002<\/li>\n
  2. \u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\uff08Extension ClassLoader\uff09<\/strong> – \u5b83\u4eceJDK\u6269\u5c55\u76ee\u5f55\u52a0\u8f7d\u7c7b\uff0c\u901a\u5e38\u662f$JAVA_HOME\/lib\/ext\u76ee\u5f55\u3002<\/li>\n
  3. \u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668\uff08System ClassLoader\uff09<\/strong> – \u6b64\u7c7b\u52a0\u8f7d\u5668\u4ece\u5f53\u524d\u7c7b\u8def\u5f84\u52a0\u8f7d\u7c7b\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u8c03\u7528\u7a0b\u5e8f\u65f6\u4f7f\u7528-cp\u6216-classpath\u547d\u4ee4\u884c\u9009\u9879\u6765\u8bbe\u7f6e\u7c7b\u8def\u5f84\u3002<\/li>\n<\/ol>\n

    \u7c7b\u52a0\u8f7d\u5668\u5c42\u6b21\u7ed3\u6784<\/h2>\n

    \u7c7b\u52a0\u8f7d\u5668\u5728\u5c06\u7c7b\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u65f6\u662f\u5177\u6709\u5c42\u6b21\u6027\u7684\u3002\u6bcf\u5f53\u6709\u4e00\u4e2a\u52a0\u8f7d\u7c7b\u7684\u8bf7\u6c42\u65f6\uff0c\u7c7b\u52a0\u8f7d\u5668\u4f1a\u5c06\u5176\u59d4\u6258\u7ed9\u7236\u7c7b\u52a0\u8f7d\u5668\u3002\u8fd9\u5c31\u662f\u8fd0\u884c\u73af\u5883\u4e2d\u5982\u4f55\u4fdd\u6301\u7c7b\u552f\u4e00\u6027\u7684\u65b9\u5f0f\u3002\u5982\u679c\u7236\u7c7b\u52a0\u8f7d\u5668\u627e\u4e0d\u5230\u8be5\u7c7b\uff0c\u90a3\u4e48\u7c7b\u52a0\u8f7d\u5668\u672c\u8eab\u4f1a\u5c1d\u8bd5\u52a0\u8f7d\u8be5\u7c7b\u3002\u901a\u8fc7\u6267\u884c\u4e0b\u9762\u7684Java\u7a0b\u5e8f\u6765\u7406\u89e3\u8fd9\u4e2a\u8fc7\u7a0b\u3002<\/p>\n

    package com.Olivia.classloader;\r\n\r\npublic class ClassLoaderTest {\r\n\r\n    public static void main(String[] args) {\r\n\r\n        System.out.println(\"HashMap\u7684\u7c7b\u52a0\u8f7d\u5668: \"\r\n                + java.util.HashMap.class.getClassLoader());\r\n        System.out.println(\"DNSNameService\u7684\u7c7b\u52a0\u8f7d\u5668: \"\r\n                + sun.net.spi.nameservice.dns.DNSNameService.class\r\n                        .getClassLoader());\r\n        System.out.println(\"\u5f53\u524d\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668: \"\r\n                + ClassLoaderTest.class.getClassLoader());\r\n\r\n        System.out.println(com.mysql.jdbc.Blob.class.getClassLoader());\r\n\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n
    \u8f93\u51fa\uff1a<\/p>\n
    HashMap\u7684\u7c7b\u52a0\u8f7d\u5668: null\r\nDNSNameService\u7684\u7c7b\u52a0\u8f7d\u5668: sun.misc.Launcher$ExtClassLoader@7c354093\r\n\u5f53\u524d\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668: sun.misc.Launcher$AppClassLoader@64cbbe37\r\nsun.misc.Launcher$AppClassLoader@64cbbe37\r\n<\/code><\/pre>\n
    Java\u7c7b\u52a0\u8f7d\u5668\u7684\u5de5\u4f5c\u539f\u7406\u662f\u600e\u6837\u7684\uff1f<\/h2>\n
    \u8ba9\u6211\u4eec\u4ece\u4e0a\u9762\u7684\u7a0b\u5e8f\u8f93\u51fa\u4e2d\u7406\u89e3\u7c7b\u52a0\u8f7d\u5668\u7684\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n
      \n
    • java.util.HashMap\u7684\u7c7b\u52a0\u8f7d\u5668\u663e\u793a\u4e3anull\uff0c\u8fd9\u8868\u793a\u5b83\u662f\u7531\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\uff08Bootstrap ClassLoader\uff09\u52a0\u8f7d\u7684\u3002DNSNameService\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668\u662f\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\uff08ExtClassLoader\uff09\u3002\u7531\u4e8e\u8be5\u7c7b\u672c\u8eab\u5728CLASSPATH\u4e2d\uff0c\u6240\u4ee5\u7531\u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668\uff08System ClassLoader\uff09\u52a0\u8f7d\u3002<\/li>\n
    • \u5f53\u6211\u4eec\u5c1d\u8bd5\u52a0\u8f7dHashMap\u65f6\uff0c\u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668\u5c06\u5176\u59d4\u6258\u7ed9\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\u3002\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\u53c8\u5c06\u5176\u59d4\u6258\u7ed9\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u3002\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u627e\u5230HashMap\u7c7b\u5e76\u5c06\u5176\u52a0\u8f7d\u5230JVM\u5185\u5b58\u4e2d\u3002<\/li>\n
    • DNSNameService\u7c7b\u9075\u5faa\u76f8\u540c\u7684\u52a0\u8f7d\u8fc7\u7a0b\u3002\u4f46\u662f\uff0c\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u65e0\u6cd5\u627e\u5230\u5b83\uff0c\u56e0\u4e3a\u5b83\u4f4d\u4e8e$JAVA_HOME\/lib\/ext\/dnsns.jar\u4e2d\u3002\u56e0\u6b64\uff0c\u5b83\u7531\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u3002<\/li>\n
    • Blob\u7c7b\u5305\u542b\u5728MySql JDBC Connector jar\uff08mysql-connector-java-5.0.7-bin.jar\uff09\u4e2d\uff0c\u8be5jar\u6587\u4ef6\u4f4d\u4e8e\u9879\u76ee\u7684\u6784\u5efa\u8def\u5f84\u4e2d\u3002\u5b83\u4e5f\u662f\u7531\u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u7684\u3002<\/li>\n
    • \u5b50\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u7684\u7c7b\u53ef\u4ee5\u8bbf\u95ee\u5176\u7236\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u7684\u7c7b\u3002\u56e0\u6b64\uff0c\u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u7684\u7c7b\u53ef\u4ee5\u8bbf\u95ee\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\u548c\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u7684\u7c7b\u3002<\/li>\n
    • \u5982\u679c\u5b58\u5728\u540c\u7ea7\u7c7b\u52a0\u8f7d\u5668\uff0c\u5219\u5b83\u4eec\u65e0\u6cd5\u8bbf\u95ee\u5f7c\u6b64\u52a0\u8f7d\u7684\u7c7b\u3002<\/li>\n<\/ul>\n
      \u4e3a\u4ec0\u4e48\u8981\u5728Java\u4e2d\u7f16\u5199\u81ea\u5b9a\u4e49\u7684\u7c7b\u52a0\u8f7d\u5668\uff1f<\/h2>\n
      Java\u9ed8\u8ba4\u7684\u7c7b\u52a0\u8f7d\u5668\u53ef\u4ee5\u4ece\u672c\u5730\u6587\u4ef6\u7cfb\u7edf\u52a0\u8f7d\u7c7b\uff0c\u8fd9\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u5df2\u7ecf\u8db3\u591f\u3002\u4f46\u662f\uff0c\u5982\u679c\u4f60\u5e0c\u671b\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u52a0\u8f7d\u7c7b\uff0c\u6216\u8005\u4eceFTP\u670d\u52a1\u5668\u3001\u901a\u8fc7\u7b2c\u4e09\u65b9Web\u670d\u52a1\u83b7\u53d6\u7c7b\uff0c\u90a3\u4e48\u4f60\u5c31\u5fc5\u987b\u6269\u5c55\u73b0\u6709\u7684\u7c7b\u52a0\u8f7d\u5668\u3002\u4f8b\u5982\uff0cAppletViewers\u4f1a\u4ece\u8fdc\u7a0bWeb\u670d\u52a1\u5668\u52a0\u8f7d\u7c7b\u3002<\/p>\n
      Java\u7c7b\u52a0\u8f7d\u5668\u7684\u65b9\u6cd5<\/h2>\n
        \n
      • \u5f53JVM\u8bf7\u6c42\u4e00\u4e2a\u7c7b\u65f6\uff0c\u5b83\u4f1a\u901a\u8fc7\u4f20\u9012\u7c7b\u7684\u5b8c\u5168\u9650\u5b9a\u540d\u6765\u8c03\u7528ClassLoader\u7684loadClass()\u65b9\u6cd5\u3002<\/li>\n
      • loadClass()\u65b9\u6cd5\u8c03\u7528findLoadedClass()\u65b9\u6cd5\u6765\u68c0\u67e5\u7c7b\u662f\u5426\u5df2\u7ecf\u88ab\u52a0\u8f7d\u3002\u8fd9\u662f\u4e3a\u4e86\u907f\u514d\u591a\u6b21\u52a0\u8f7d\u540c\u4e00\u4e2a\u7c7b\u3002<\/li>\n
      • \u5982\u679c\u7c7b\u5c1a\u672a\u52a0\u8f7d\uff0c\u90a3\u4e48\u5b83\u4f1a\u5c06\u8bf7\u6c42\u59d4\u6258\u7ed9\u7236\u7c7b\u52a0\u8f7d\u5668\u6765\u52a0\u8f7d\u8be5\u7c7b\u3002<\/li>\n
      • \u5982\u679c\u7236\u7c7b\u52a0\u8f7d\u5668\u627e\u4e0d\u5230\u8be5\u7c7b\uff0c\u90a3\u4e48\u5b83\u5c06\u8c03\u7528findClass()\u65b9\u6cd5\u5728\u6587\u4ef6\u7cfb\u7edf\u4e2d\u67e5\u627e\u7c7b\u3002<\/li>\n<\/ul>\n
        Java\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u793a\u4f8b<\/h2>\n
        \"Java<\/div>\n
        CCLoader.java<\/h3>\n
        Java \u7c7b\u52a0\u8f7d\u5668 – \u7b2c2\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09<\/h2>\n
        \u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u53ca\u5176\u65b9\u6cd5<\/h3>\n
        \u8fd9\u662f\u6211\u4eec\u7684\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\uff0c\u5177\u6709\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n
          \n
        1. loadClassFileData(String name)\u65b9\u6cd5<\/strong>\uff1a\u79c1\u6709\u65b9\u6cd5\uff0c\u4ece\u6587\u4ef6\u7cfb\u7edf\u4e2d\u8bfb\u53d6\u7c7b\u6587\u4ef6\uff0c\u5e76\u5c06\u5176\u8f6c\u6362\u4e3a\u5b57\u8282\u6570\u7ec4\u3002<\/li>\n
        2. getClass(String name)\u65b9\u6cd5<\/strong>\uff1a\u8c03\u7528loadClassFileData()\u51fd\u6570\uff0c\u5e76\u901a\u8fc7\u8c03\u7528\u7236\u7c7b\u7684defineClass()\u65b9\u6cd5\u6765\u751f\u6210\u5e76\u8fd4\u56deClass\u5bf9\u8c61\u3002<\/li>\n
        3. loadClass(String name)\u65b9\u6cd5<\/strong>\uff1a\u516c\u5171\u65b9\u6cd5\uff0c\u8d1f\u8d23\u52a0\u8f7d\u7c7b\u3002\u5982\u679c\u7c7b\u540d\u4ee5com.Olivia\uff08\u6211\u4eec\u7684\u793a\u4f8b\u5305\uff09\u5f00\u5934\uff0c\u5219\u4f7f\u7528getClass()\u65b9\u6cd5\u52a0\u8f7d\u5b83\uff1b\u5426\u5219\uff0c\u5c06\u8c03\u7528\u7236\u7c7b\u7684loadClass()\u65b9\u6cd5\u6765\u52a0\u8f7d\u3002<\/li>\n
        4. CCLoader(ClassLoader parent)\u6784\u9020\u65b9\u6cd5<\/strong>\uff1a\u8d1f\u8d23\u8bbe\u7f6e\u7236\u7c7b\u52a0\u8f7d\u5668\u3002<\/li>\n<\/ol>\n
          import java.io.DataInputStream;\r\nimport java.io.File;\r\nimport java.io.IOException;\r\nimport java.io.InputStream;\r\n \r\n\/**\r\n * \u6211\u4eec\u7684\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\uff0c\u7528\u4e8e\u52a0\u8f7d\u7c7b\u3002\r\n * com.Olivia\u5305\u4e2d\u7684\u4efb\u4f55\u7c7b\u90fd\u5c06\u4f7f\u7528\u6b64\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u3002\r\n * \u5bf9\u4e8e\u5176\u4ed6\u7c7b\uff0c\u5b83\u5c06\u628a\u8bf7\u6c42\u59d4\u6258\u7ed9\u5176\u7236\u7c7b\u52a0\u8f7d\u5668\u3002\r\n *\/\r\npublic class CCLoader extends ClassLoader {\r\n \r\n    \/**\r\n     * \u6b64\u6784\u9020\u51fd\u6570\u7528\u4e8e\u8bbe\u7f6e\u7236\u7c7b\u52a0\u8f7d\u5668\r\n     *\/\r\n    public CCLoader(ClassLoader parent) {\r\n        super(parent);\r\n    }\r\n \r\n    \/**\r\n     * \u4ece\u6587\u4ef6\u7cfb\u7edf\u52a0\u8f7d\u7c7b\u3002\u7c7b\u6587\u4ef6\u5e94\u4f4d\u4e8e\u6587\u4ef6\u7cfb\u7edf\u4e2d\u3002\r\n     * \u540d\u79f0\u5e94\u8be5\u662f\u76f8\u5bf9\u4e8e\u83b7\u53d6\u6587\u4ef6\u4f4d\u7f6e\u7684\u8def\u5f84\r\n     *\r\n     * @param name\r\n     *            \u7c7b\u7684\u5b8c\u5168\u9650\u5b9a\u540d\uff0c\u4f8b\u5982com.Olivia.Foo\r\n     *\/\r\n    private Class getClass(String name) throws ClassNotFoundException {\r\n        String file = name.replace('.', File.separatorChar) + \".class\";\r\n        byte[] b = null;\r\n        try {\r\n            \/\/ \u8fd9\u4ece\u6587\u4ef6\u52a0\u8f7d\u5b57\u8282\u7801\u6570\u636e\r\n            b = loadClassFileData(file);\r\n            \/\/ defineClass\u7ee7\u627f\u81eaClassLoader\u7c7b\r\n            \/\/ \u5c06\u5b57\u8282\u6570\u7ec4\u8f6c\u6362\u4e3aClass\u3002defineClass\u662ffinal\u65b9\u6cd5\r\n            \/\/ \u6240\u4ee5\u6211\u4eec\u4e0d\u80fd\u91cd\u5199\u5b83\r\n            Class c = defineClass(name, b, 0, b.length);\r\n            resolveClass(c);\r\n            return c;\r\n        } catch (IOException e) {\r\n            e.printStackTrace();\r\n            return null;\r\n        }\r\n    }\r\n \r\n    \/**\r\n     * \u6bcf\u4e2a\u7c7b\u7684\u8bf7\u6c42\u90fd\u901a\u8fc7\u6b64\u65b9\u6cd5\u3002\r\n     * \u5982\u679c\u7c7b\u5728com.Olivia\u5305\u4e2d\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u6b64\u7c7b\u52a0\u8f7d\u5668\uff0c\r\n     * \u5426\u5219\u5c06\u8bf7\u6c42\u59d4\u6258\u7ed9\u7236\u7c7b\u52a0\u8f7d\u5668\u3002\r\n     *\r\n     * @param name\r\n     *            \u5b8c\u6574\u7c7b\u540d\r\n     *\/\r\n    @Override\r\n    public Class loadClass(String name) throws ClassNotFoundException {\r\n        System.out.println(\"\u6b63\u5728\u52a0\u8f7d\u7c7b '\" + name + \"'\");\r\n        if (name.startsWith(\"com.Olivia\")) {\r\n            System.out.println(\"\u4f7f\u7528CCLoader\u52a0\u8f7d\u7c7b\");\r\n            return getClass(name);\r\n        }\r\n        return super.loadClass(name);\r\n    }\r\n \r\n    \/**\r\n     * \u5c06\u6587\u4ef6(.class)\u8bfb\u53d6\u5230\u5b57\u8282\u6570\u7ec4\u4e2d\u3002\r\n     * \u8be5\u6587\u4ef6\u5e94\u8be5\u53ef\u4ee5\u4f5c\u4e3a\u8d44\u6e90\u8bbf\u95ee\uff0c\r\n     * \u5e76\u786e\u4fdd\u5b83\u4e0d\u5728\u7c7b\u8def\u5f84\u4e2d\uff0c\u4ee5\u907f\u514d\u4efb\u4f55\u6df7\u6dc6\u3002\r\n     *\r\n     * @param name\r\n     *            \u6587\u4ef6\u540d\r\n     * @return \u4ece\u6587\u4ef6\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u7ec4\r\n     * @throws IOException\r\n     *             \u5982\u679c\u8bfb\u53d6\u6587\u4ef6\u65f6\u51fa\u73b0\u5f02\u5e38\r\n     *\/\r\n    private byte[] loadClassFileData(String name) throws IOException {\r\n        InputStream stream = getClass().getClassLoader().getResourceAsStream(\r\n                name);\r\n        int size = stream.available();\r\n        byte buff[] = new byte[size];\r\n        DataInputStream in = new DataInputStream(stream);\r\n        in.readFully(buff);\r\n        in.close();\r\n        return buff;\r\n    }\r\n}\r\n<\/code><\/pre>\n
          2. CCRun.java – \u6d4b\u8bd5\u7c7b<\/h3>\n
          \u8fd9\u662f\u6211\u4eec\u7684\u6d4b\u8bd5\u7c7b\uff0c\u5176\u4e2d\u5305\u542b\u4e3b\u51fd\u6570\u3002\u6211\u4eec\u6b63\u5728\u521b\u5efa\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5e76\u4f7f\u7528\u5176loadClass()\u65b9\u6cd5\u52a0\u8f7d\u6837\u672c\u7c7b\u3002\u5728\u52a0\u8f7d\u7c7b\u4e4b\u540e\uff0c\u6211\u4eec\u4f7f\u7528Java\u7684\u53cd\u5c04API\u6765\u8c03\u7528\u5176\u65b9\u6cd5\u3002<\/p>\n
          import java.lang.reflect.Method;\r\n \r\npublic class CCRun {\r\n \r\n    public static void main(String args[]) throws Exception {\r\n        String progClass = args[0];\r\n        String progArgs[] = new String[args.length - 1];\r\n        System.arraycopy(args, 1, progArgs, 0, progArgs.length);\r\n\r\n        CCLoader ccl = new CCLoader(CCRun.class.getClassLoader());\r\n        Class clas = ccl.loadClass(progClass);\r\n        Class mainArgType[] = { (new String[0]).getClass() };\r\n        Method main = clas.getMethod(\"main\", mainArgType);\r\n        Object argsArray[] = { progArgs };\r\n        main.invoke(null, argsArray);\r\n\r\n        \/\/ \u4e0b\u9762\u7684\u65b9\u6cd5\u7528\u4e8e\u68c0\u67e5Foo\u7c7b\u662f\u5426\u88ab\u6211\u4eec\u7684\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668CCLoader\u52a0\u8f7d\r\n        Method printCL = clas.getMethod(\"printCL\", null);\r\n        printCL.invoke(null, new Object[0]);\r\n    }\r\n \r\n}\r\n<\/code><\/pre>\n
          3. Foo.java\u548cBar.java<\/h3>\n
          \u8fd9\u662f\u6587\u7ae0\u300aJava \u7c7b\u52a0\u8f7d\u5668\u300b\u7684\u7b2c3\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n
          \u8fd9\u4e9b\u662f\u6211\u4eec\u7684\u6d4b\u8bd5\u7c7b\uff0c\u5b83\u4eec\u7531\u6211\u4eec\u81ea\u5b9a\u4e49\u7684\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u3002\u5b83\u4eec\u6709\u4e00\u4e2aprintCL()\u65b9\u6cd5\uff0c\u7528\u4e8e\u6253\u5370\u7c7b\u52a0\u8f7d\u5668\u4fe1\u606f\u3002Foo\u7c7b\u5c06\u7531\u6211\u4eec\u7684\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u3002Foo\u4f7f\u7528Bar\u7c7b\uff0c\u56e0\u6b64Bar\u7c7b\u4e5f\u5c06\u7531\u6211\u4eec\u7684\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u3002<\/p>\n
          package com.Olivia.cl;\r\n \r\npublic class Foo {\r\n    static public void main(String args[]) throws Exception {\r\n        System.out.println(\"Foo Constructor >>> \" + args[0] + \" \" + args[1]);\r\n        Bar bar = new Bar(args[0], args[1]);\r\n        bar.printCL();\r\n    }\r\n \r\n    public static void printCL() {\r\n        System.out.println(\"Foo ClassLoader: \"+Foo.class.getClassLoader());\r\n    }\r\n}\r\n<\/code><\/pre>\n
          package com.Olivia.cl;\r\n \r\npublic class Bar {\r\n \r\n    public Bar(String a, String b) {\r\n        System.out.println(\"Bar Constructor >>> \" + a + \" \" + b);\r\n    }\r\n \r\n    public void printCL() {\r\n        System.out.println(\"Bar ClassLoader: \"+Bar.class.getClassLoader());\r\n    }\r\n}\r\n<\/code><\/pre>\n
          4. Java\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u6267\u884c\u6b65\u9aa4<\/h3>\n
          \u9996\u5148\uff0c\u6211\u4eec\u5c06\u901a\u8fc7\u547d\u4ee4\u884c\u7f16\u8bd1\u6240\u6709\u7684\u7c7b\u3002\u7136\u540e\uff0c\u6211\u4eec\u5c06\u901a\u8fc7\u4f20\u9012\u4e09\u4e2a\u53c2\u6570\u6765\u8fd0\u884cCCRun\u7c7b\u3002\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u5b8c\u5168\u5206\u7c7b\u7684Foo\u7c7b\u540d\u79f0\uff0c\u5c06\u88ab\u6211\u4eec\u7684\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u3002\u5176\u4ed6\u4e24\u4e2a\u53c2\u6570\u5c06\u4f20\u9012\u7ed9Foo\u7c7b\u7684main\u51fd\u6570\u548cBar\u6784\u9020\u51fd\u6570\u3002\u6267\u884c\u6b65\u9aa4\u548c\u8f93\u51fa\u5982\u4e0b\u3002<\/p>\n
          $ javac -cp . com\/scdev\/cl\/Foo.java\r\n$ javac -cp . com\/scdev\/cl\/Bar.java\r\n$ javac CCLoader.java\r\n$ javac CCRun.java\r\nCCRun.java:18: warning: non-varargs call of varargs method with inexact argument type for last parameter;\r\ncast to java.lang.Class<?> for a varargs call\r\ncast to java.lang.Class<?>[] for a non-varargs call and to suppress this warning\r\nMethod printCL = clas.getMethod(\"printCL\", null);\r\n^\r\n1 warning\r\n$ java CCRun com.Olivia.cl.Foo 1212 1313\r\nLoading Class 'com.Olivia.cl.Foo'\r\nLoading Class using CCLoader\r\nLoading Class 'java.lang.Object'\r\nLoading Class 'java.lang.String'\r\nLoading Class 'java.lang.Exception'\r\nLoading Class 'java.lang.System'\r\nLoading Class 'java.lang.StringBuilder'\r\nLoading Class 'java.io.PrintStream'\r\nFoo Constructor >>> 1212 1313\r\nLoading Class 'com.Olivia.cl.Bar'\r\nLoading Class using CCLoader\r\nBar Constructor >>> 1212 1313\r\nLoading Class 'java.lang.Class'\r\nBar ClassLoader: CCLoader@71f6f0bf\r\nFoo ClassLoader: CCLoader@71f6f0bf\r\n$\r\n<\/code><\/pre>\n
          \u5982\u679c\u60a8\u67e5\u770b\u8f93\u51fa\uff0c\u5b83\u6b63\u5728\u5c1d\u8bd5\u52a0\u8f7dcom.Olivia.cl.Foo\u7c7b\u3002\u7531\u4e8e\u5b83\u7ee7\u627f\u4e86java.lang.Object\u7c7b\uff0c\u6240\u4ee5\u5b83\u9996\u5148\u5c1d\u8bd5\u52a0\u8f7dObject\u7c7b\u3002\u56e0\u6b64\uff0c\u8bf7\u6c42\u5230\u8fbe\u4e86CCLoader\u7684loadClass\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u5c06\u5176\u59d4\u6d3e\u7ed9\u7236\u7c7b\u3002\u56e0\u6b64\uff0c\u7236\u7c7b\u52a0\u8f7d\u5668\u6b63\u5728\u52a0\u8f7dObject\u3001String\u548c\u5176\u4ed6Java\u7c7b\u3002\u6211\u4eec\u7684\u7c7b\u52a0\u8f7d\u5668\u4ec5\u4ece\u6587\u4ef6\u7cfb\u7edf\u52a0\u8f7dFoo\u548cBar\u7c7b\u3002\u4eceprintCL()\u51fd\u6570\u7684\u8f93\u51fa\u4e2d\u53ef\u4ee5\u6e05\u695a\u5730\u770b\u51fa\u3002\u6211\u4eec\u53ef\u4ee5\u6539\u53d8loadClassFileData()\u529f\u80fd\uff0c\u4eceFTP\u670d\u52a1\u5668\u8bfb\u53d6\u5b57\u8282\u6570\u7ec4\uff0c\u6216\u8005\u901a\u8fc7\u8c03\u7528\u4efb\u4f55\u7b2c\u4e09\u65b9\u670d\u52a1\u6765\u52a8\u6001\u83b7\u53d6\u7c7b\u5b57\u8282\u6570\u7ec4\u3002\u6211\u5e0c\u671b\u672c\u6587\u5bf9\u7406\u89e3Java\u7c7b\u52a0\u8f7d\u5668\u7684\u5de5\u4f5c\u539f\u7406\u4ee5\u53ca\u6211\u4eec\u5982\u4f55\u6269\u5c55\u5b83\u4ee5\u5b8c\u6210\u66f4\u591a\u4efb\u52a1\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
          \u5c06\u81ea\u5b9a\u4e49\u7684\u7c7b\u52a0\u8f7d\u5668\u4f5c\u4e3a\u9ed8\u8ba4\u7684\u7c7b\u52a0\u8f7d\u5668<\/h2>\n
          \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Java\u9009\u9879\u8ba9\u6211\u4eec\u7684\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u6210\u4e3aJVM\u542f\u52a8\u65f6\u7684\u9ed8\u8ba4\u7c7b\u52a0\u8f7d\u5668\u3002\u4f8b\u5982\uff0c\u5728\u63d0\u4f9bJava\u7c7b\u52a0\u8f7d\u5668\u9009\u9879\u540e\uff0c\u6211\u5c06\u518d\u6b21\u8fd0\u884cClassLoaderTest\u7a0b\u5e8f\u3002<\/p>\n
          $ javac -cp .:..\/lib\/mysql-connector-java-5.0.7-bin.jar com\/scdev\/classloader\/ClassLoaderTest.java\r\n$ java -cp .:..\/lib\/mysql-connector-java-5.0.7-bin.jar -Djava.system.class.loader=CCLoader com.Olivia.classloader.ClassLoaderTest\r\nLoading Class 'com.Olivia.classloader.ClassLoaderTest'\r\nLoading Class using CCLoader\r\nLoading Class 'java.lang.Object'\r\nLoading Class 'java.lang.String'\r\nLoading Class 'java.lang.System'\r\nLoading Class 'java.lang.StringBuilder'\r\nLoading Class 'java.util.HashMap'\r\nLoading Class 'java.lang.Class'\r\nLoading Class 'java.io.PrintStream'\r\nclass loader for HashMap: null\r\nLoading Class 'sun.net.spi.nameservice.dns.DNSNameService'\r\nclass loader for DNSNameService: sun.misc.Launcher$ExtClassLoader@24480457\r\nclass loader for this class: CCLoader@38503429\r\nLoading Class 'com.mysql.jdbc.Blob'\r\nsun.misc.Launcher$AppClassLoader@2f94ca6c\r\n$\r\n<\/code><\/pre>\n
          CCLoader\u6b63\u5728\u52a0\u8f7dClassLoaderTest\u7c7b\uff0c\u56e0\u4e3a\u5b83\u4f4d\u4e8ecom.Olivia\u5305\u4e2d\u3002<\/p>\n
          \u4f60\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u5b58\u50a8\u5e93\u4e2d\u4e0b\u8f7d\u7c7b\u52a0\u8f7d\u5668\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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