{"id":18387,"date":"2025-07-08T22:33:39","date_gmt":"2025-07-08T14:33:39","guid":{"rendered":"https:\/\/92it.top\/?p=18387"},"modified":"2025-07-08T22:33:39","modified_gmt":"2025-07-08T14:33:39","slug":"java%e5%ae%89%e5%85%a8-java%e5%8f%8d%e5%b0%84%e5%8f%8a%e7%b1%bb%e5%8a%a0%e8%bd%bd","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=18387","title":{"rendered":"Java\u5b89\u5168-Java\u53cd\u5c04\u53ca\u7c7b\u52a0\u8f7d"},"content":{"rendered":"\n

\u8f6c\u8f7d\uff1aJava\u5b89\u5168-Java\u53cd\u5c04\u53ca\u7c7b\u52a0\u8f7d<\/a><\/p>\n\n\n\n

\u4e00\u3001\u53cd\u5c04\u4ecb\u7ecd<\/strong><\/p>\n\n\n\n

\n\n\n\n

\u8ba1\u7b97\u5668\u6848\u4f8b<\/strong><\/p>\n\n\n\n

\u9996\u5148\u5148\u6765\u770b\u6848\u4f8b\uff0c\u57fa\u4e8e\u201c\u6b63\u5c04\u201d\u8c03\u7528\u8ba1\u7b97\u5668\uff1a<\/p>\n\n\n\n

public class Test {\n    public static void main(String[] args) throws IOException {\n        java.lang.Runtime.getRuntime().exec(\"calc.exe\");\n    }\n}\n<\/pre>\n\n\n\n
\u57fa\u4e8e\u53cd\u5c04\u8c03\u7528\u5982\u4e0b\uff1a<\/p>\n\n\n\n
public class Test {\n    public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {\n\/\/        java.lang.Runtime.getRuntime().exec(\"calc.exe\");\n        Class<?> aClass = Class.forName(\"java.lang.Runtime\");\n        Method exec = aClass.getMethod(\"exec\", String.class);\n        Method getRuntime = aClass.getMethod(\"getRuntime\");\n        Object invoke = getRuntime.invoke(null);\n        exec.invoke(invoke,\"calc.exe\");\n    }\n}\n<\/pre>\n\n\n
\n
\"\"<\/figure><\/div>\n\n\n
    \n
  • 1.\u9996\u5148\u5229\u7528Class.forName\u52a8\u6001\u52a0\u8f7djava.lang.Runtime<\/li>\n\n\n\n
  • 2.\u83b7\u53d6getRuntime\u3001exec\u7684\u65b9\u6cd5\u5bf9\u8c61<\/li>\n\n\n\n
  • 3.\u83b7\u53d6\u9759\u6001\u7684runtime\u5b9e\u4f8b\uff0c\u4e0d\u9700\u8981\u4f20\u9012\u53c2\u6570\u6240\u4ee5\u4f20\u9012null\u503c\u3002<\/li>\n\n\n\n
  • 4.\u83b7\u53d6exec\u5b9e\u4f8b\uff0c\u5176\u4e2d\u4f20\u9012\u7684runtime\u7684\u5bf9\u8c61\u5b9e\u4f8b\u548c\u9700\u6267\u884c\u7684\u547d\u4ee4\u5373\u53ef\u3002<\/li>\n<\/ul>\n\n\n\n
    \u3000<\/p>\n\n\n\n
    \u4e8c\u3001java\u53cd\u5c04\u6982\u5ff5<\/strong><\/p>\n\n\n\n
    \n\n\n\n
    \uff081\uff09\u53cd\u5c04\u6982\u5ff5<\/strong><\/p>\n\n\n\n
    \u9996\u5148\uff0cJava\u662f\u9759\u6001\u8bed\u8a00\uff1b\u4e3a\u4e86\u5b9e\u73b0\u4e00\u5b9a\u7684\u52a8\u6001\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u53cd\u5c04\u673a\u5236<\/strong>\u83b7\u5f97\u7c7b\u4f3c\u52a8\u6001\u8bed\u8a00\u7684\u7279\u6027\uff0cJava\u7684\u52a8\u6001\u6027\u8ba9\u7f16\u7a0b\u53d8\u5f97\u66f4\u52a0\u7075\u6d3b\u3002<\/p>\n\n\n\n
    \u53cd\u5c04\u53ef\u4ee5\u7528\u6765\u7f16\u5199\u80fd\u591f\u52a8\u6001\u64cd\u7eb5Java\u4ee3\u7801\u7684\u7a0b\u5e8f\u3002\u4f7f\u7528\u53cd\u5c04\uff0cJava\u53ef\u4ee5\u652f\u6301\u7528\u6237\u754c\u9762\u751f\u6210\u5668\u3001\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\u5668\u4ee5\u53ca\u5f88\u591a\u5176\u4ed6\u9700\u8981\u52a8\u6001\u67e5\u8be2\u7c7b\u80fd\u529b\u7684\u5f00\u53d1\u5de5\u5177\u3002Java\u7684\u53cd\u5c04\u662f\u6307\u7a0b\u5e8f\u5728\u8fd0\u884c\u671f\u53ef\u4ee5\u62ff\u5230\u4e00\u4e2a\u5bf9\u8c61\u7684\u6240\u6709\u4fe1\u606f\uff0c\u5e76\u80fd\u76f4\u63a5\u64cd\u4f5c\u4efb\u610f\u5bf9\u8c61\u5185\u90e8\u5c5e\u6027\u53ca\u65b9\u6cd5\u3002<\/strong><\/p>\n\n\n\n
    \u52a0\u8f7d\u5b8c\u7c7b\u4e4b\u540e\uff0c\u5728\u5806\u5185\u5b58\u7684\u65b9\u6cd5\u533a\u4e2d\u5c31\u751f\u6210\u4e86\u4e00\u4e2aClass\u7c7b\u7c7b\u578b\u7684\u5bf9\u8c61\uff08\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2aClass\u5bf9\u8c61\uff09\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u5305\u542b\u4e86\u5b8c\u6574\u7684\u7c7b\u7684\u7ed3\u6784\u4fe1\u606f\u3002<\/strong>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a\u5bf9\u8c61\u770b\u5230\u7c7b\u7684\u7ed3\u6784\u3002 \u8fd9\u4e2a\u5bf9\u8c61\u5c31\u7c7b\u4f3c\u4e00\u4e2a\u955c\u5b50\uff0c\u900f\u8fc7\u955c\u5b50\u53ef\u4ee5\u770b\u5230\u7c7b\u7ed3\u6784\uff0c\u6240\u4ee5\u6211\u4eec\u79f0\u4e4b\u4e3a\u53cd\u5c04\u3002<\/strong><\/p>\n\n\n\n
    \u5404\u7c7b\u6846\u67b6\u5e95\u5c42\uff0c\u90fd\u9700\u8981\u7528\u5230\u53cd\u5c04\u3002<\/p>\n\n\n\n
    \u6b63\u5e38\u5f15\u7528\uff1a\u5f15\u5165\u5305\u8def\u5f84 \u27a1  \u5c06\u5bf9\u8c61\u5b9e\u4f8b\u5316 \u27a1 \u64cd\u4f5c\u5b9e\u4f8b\u5316\u5bf9\u8c61<\/p>\n\n\n
    \n
    \"\"<\/figure><\/div>\n\n\n
    \u3000<\/p>\n\n\n\n
    \uff082\uff09\u53cd\u5c04\u673a\u5236\u4f5c\u7528<\/strong><\/p>\n\n\n\n
      \n
    • 1.\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u83b7\u53d6\u5bf9\u8c61\u7684\u4fe1\u606f\uff08\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff09\u3002<\/li>\n\n\n\n
    • 2.\u52a8\u6001\u8c03\u7528\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/li>\n\n\n\n
    • 3.\u5728\u8fd0\u884c\u65f6\u83b7\u53d6\u6cdb\u578b\u4fe1\u606f<\/li>\n<\/ul>\n\n\n\n
      \u3000<\/p>\n\n\n\n
      \uff083\uff09\u53cd\u5c04\u539f\u7406\u56fe<\/strong><\/p>\n\n\n\n
      Java\u7a0b\u5e8f\u5728\u8ba1\u7b97\u673a\u4e2d\u6709\u4e09\u4e2a\u9636\u6bb5\uff1a<\/p>\n\n\n\n
        \n
      • 1.\u6e90\u4ee3\u7801\u9636\u6bb5\uff1a\u6307.java\u6587\u4ef6\uff0c\u4e5f\u5c31\u662f\u6e90\u7801\uff1b\u5b58\u50a8\u5728\u786c\u76d8\u4e2d\uff1b<\/li>\n\n\n\n
      • 2.\u7f16\u8bd1\u9636\u6bb5\uff1a\u4f7f\u7528javac\u5bf9.java\u6587\u4ef6\u8fdb\u884c\u7f16\u8bd1\uff0c\u751f\u6210.class\u5b57\u8282\u7801\u6587\u4ef6\uff1b\u540c\u6837\u5b58\u50a8\u5728\u786c\u76d8\u4e2d\uff1b<\/li>\n\n\n\n
      • 3.Class\u7c7b\u5bf9\u8c61\u9636\u6bb5\uff1a\u57fa\u4e8e\u7c7b\u52a0\u8f7d\u5668\u5c06.class\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d \uff0c\u8fd9\u91cc\u52a0\u8f7d\u7684\u662f\u4e00\u4e2a\u7c7b\u5bf9\u8c61\u3002<\/li>\n\n\n\n
      • 4.Runtime\u8fd0\u884c\u65f6\u9636\u6bb5\uff1a\u4ece\u5185\u5b58\u4e2d\u53d6\u5230\u9700\u8981\u7528\u7684.class\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u4f7f\u7528java\u89e3\u91ca\u5668\u5c06\u5b57\u8282\u7801\u6587\u4ef6\u89e3\u91ca\u4e3a\u673a\u5668\u7801\uff0c\u6267\u884c\u5e76\u8fd4\u56de\u7ed3\u679c\u3002<\/li>\n<\/ul>\n\n\n
        \n
        \"\"<\/figure><\/div>\n\n\n
        \u7c7b\u52a0\u8f7d\u8fc7\u7a0b\uff1a<\/strong><\/p>\n\n\n\n
          \n
        • 1.\u901a\u8fc7\u7c7b\u7684\u5168\u7c7b\u540d\u83b7\u5f97\u4e8c\u8fdb\u5236\u5b57\u8282\u6d41<\/li>\n\n\n\n
        • 2.\u5c06\u83b7\u5f97\u5f97\u5b57\u8282\u6d41\u6240\u4ee3\u8868\u5f97\u9759\u6001\u5b58\u50a8\u7ed3\u6784\u8f6c\u6362\u6210\u65b9\u6cd5\u533a\u8fd0\u884c\u65f6\u7684\u6570\u636e\u7ed3\u6784<\/li>\n\n\n\n
        • 3.\u5e76\u5728\u5806\u5185\u5b58\u4e2d\u521b\u5efa\u4e00\u4e2ajava.lang.Class\u5bf9\u8c61 \uff0c\u4f5c\u4e3a\u65b9\u6cd5\u533a\u4e2d\u6570\u636e\u7ed3\u6784\u5f97\u8bbf\u95ee\u5165\u53e3\u3002<\/li>\n<\/ul>\n\n\n\n
          \u3000<\/p>\n\n\n\n
          \uff084\uff09\u7c7b\u52a0\u8f7d\u673a\u5236<\/strong><\/p>\n\n\n\n
          \u7c7b\u52a0\u8f7d\u8fc7\u7a0b<\/strong><\/p>\n\n\n\n
          \u7c7b\u7684\u52a0\u8f7d\u8fc7\u7a0b\u4e3a\u4e09\u6b65\uff0c\u5206\u522b\u662f\uff1a\u7c7b\u7684\u52a0\u8f7d\u3001\u94fe\u63a5\u3001\u521d\u59cb\u5316\u3002<\/p>\n\n\n\n
          1.\u7c7b\u7684\u52a0\u8f7d\uff08Loading\uff09<\/p>\n\n\n\n
          \u7531\u7c7b\u52a0\u8f7d\u5668ClassLoader\u5c06\u7c7b\u7684class\u5b57\u8282\u7801\u6587\u4ef6\u8bfb\u5165JVM\u5185\u5b58\u4e2d\uff0c\u5e76\u521b\u5efa\u5176Class\u5bf9\u8c61\u3002<\/p>\n\n\n\n
          \u53ef\u4ee5\u4ece\u4ee5\u4e0b\u6765\u6e90\u52a0\u8f7d\u7c7b\u7684\u5b57\u8282\u7801\u6587\u4ef6\uff1a 1.\u4ece\u672c\u5730\u6587\u4ef6\u7cfb\u7edf\u52a0\u8f7dclass\u6587\u4ef6\u3002 2.\u4eceJAR\u5305\u3001WAR\u5305\u52a0\u8f7dclass\u6587\u4ef6 3.\u901a\u8fc7\u7f51\u7edc\u52a0\u8f7dclass\u6587\u4ef6<\/pre>\n\n\n\n
          \u3000<\/p>\n\n\n\n
          2.\u7c7b\u7684\u94fe\u63a5\uff08Linking\uff09<\/p>\n\n\n\n
          \u5f53\u52a0\u8f7d\u5b8c\u7c7b\u540e\uff0c\u7cfb\u7edf\u4f1a\u751f\u6210\u4e00\u4e2a\u5bf9\u5e94\u7684Class\u6587\u4ef6\u3002\u751f\u6210\u540e\uff0c\u4f1a\u8fdb\u5165\u94fe\u63a5\u9636\u6bb5\uff1b\u5c06\u4e8c\u8fdb\u5236\u6570\u636e\u5408\u5e76\u5230JRE\u4e2d\u3002<\/p>\n\n\n\n
          \u7c7b\u94fe\u63a5\u4e09\u4e2a\u9636\u6bb5\uff1a

          1.\u9a8c\u8bc1\uff1a\u6821\u9a8c\u52a0\u8f7d\u7684\u7c7b\u662f\u5426\u7ed3\u6784\u6b63\u786e\uff1b

          2.\u51c6\u5907\uff1a\u4e3a\u7c7b\u53d8\u91cf\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff0c\u5e76\u8bbe\u7f6e\u521d\u59cb\u503c\uff1b

          3.\u89e3\u6790\uff1a\u5c06\u7c7b\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u4e2d\u7684\u7b26\u53f7\u5f15\u7528\u66ff\u6362\u6210\u76f4\u63a5\u5f15\u7528\uff1b<\/pre>\n\n\n\n
          \u3000<\/p>\n\n\n\n
          3.\u7c7b\u7684\u521d\u59cb\u5316\uff08Initialization\uff09<\/p>\n\n\n\n
          JVM\u8d1f\u8d23\u5bf9\u7c7b\u8fdb\u884c\u521d\u59cb\u5316\u3002\u521d\u59cb\u5316\u662f\u7c7b\u52a0\u8f7d\u7684\u6700\u540e\u4e00\u6b65\uff0c\u4e5f\u662f\u771f\u6b63\u6267\u884c\u7c7b\u4e2d\u5b9a\u4e49\u7684 Java \u7a0b\u5e8f\u4ee3\u7801\uff0c\u521d\u59cb\u5316\u662f\u4e3a\u7c7b\u7684\u9759\u6001\u53d8\u91cf\u8d4b\u4e88\u6b63\u786e\u7684\u521d\u59cb\u503c\u3002<\/p>\n\n\n\n
          JVM\u521d\u59cb\u5316\u4e00\u4e2a\u7c7b\u5305\u542b\u5982\u4e0b\u51e0\u4e2a\u6b65\u9aa4 1\uff0c\u5982\u679c\u8fd8\u6ca1\u52a0\u8f7d\u8be5\u7c7b\uff0c\u5219\u7a0b\u5e8f\u5148\u52a0\u8f7d\u5e76\u8fde\u63a5\u8be5\u7c7b 2\uff0c\u5982\u679c\u8be5\u7c7b\u7684\u76f4\u63a5\u7236\u7c7b\u8fd8\u6ca1\u6709\u88ab\u521d\u59cb\u5316\uff0c\u5219\u5148\u521d\u59cb\u5316\u5176\u76f4\u63a5\u7236\u7c7b 3\uff0c\u5982\u679c\u8be5\u7c7b\u4e2d\u6709\u521d\u59cb\u5316\u8bed\u53e5\uff0c\u5219\u7cfb\u7edf\u4f9d\u6b21\u6267\u884c\u8fd9\u4e9b\u521d\u59cb\u5316\u8bed\u53e5<\/pre>\n\n\n
          \n
          \"\"<\/figure><\/div>\n\n\n
          \u3000<\/p>\n\n\n\n
          \u53cc\u4eb2\u59d4\u6d3e\u673a\u5236<\/strong><\/p>\n\n\n\n
          Java\u4e2d\u63d0\u4f9b\u4e0b\u56db\u79cd\u7c7b\u578b\u7684\u52a0\u8f7d\u5668\uff0c\u6bcf\u4e00\u79cd\u52a0\u8f7d\u5668\u90fd\u6709\u6307\u5b9a\u7684\u52a0\u8f7d\u5bf9\u8c61\uff0c\u5177\u4f53\u5982\u4e0b\uff1a<\/p>\n\n\n\n
          Bootstrap ClassLoader\uff08\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\uff09 \uff1a\u4e3b\u8981\u8d1f\u8d23\u52a0\u8f7dJava\u6838\u5fc3\u7c7b\u5e93\uff0c%JRE_HOME%\\lib\u4e0b\u7684.jar\u5305\u548cclass\u6587\u4ef6\u3002

          Extention ClassLoader\uff08\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\uff09\uff1a\u4e3b\u8981\u8d1f\u8d23\u52a0\u8f7d\u76ee\u5f55%JRE_HOME%\\lib\\ext\u76ee\u5f55\u4e0b\u7684jar\u5305\u548cclass\u6587\u4ef6\u3002

          ApplicationClassLoader\uff08\u5e94\u7528\u7a0b\u5e8f\u7c7b\u52a0\u8f7d\u5668\uff09 \uff1a\u4e3b\u8981\u8d1f\u8d23\u52a0\u8f7d\u5f53\u524d\u5e94\u7528\u7684classpath\u4e0b\u7684\u6240\u6709\u7c7b 

          User ClassLoader\uff08\u7528\u6237\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\uff09 \uff1a \u7528\u6237\u81ea\u5b9a\u4e49\u7684\u7c7b\u52a0\u8f7d\u5668,\u53ef\u52a0\u8f7d\u6307\u5b9a\u8def\u5f84\u7684class\u6587\u4ef6<\/pre>\n\n\n\n
          \u52a0\u8f7d\u6d41\u7a0b\uff1a\u4ece\u4e0b\u5f80\u4e0a\u59d4\u6d3e\u3002\uff08\u6d41\u7a0b\u8868\u53ea\u6d89\u53ca\u5230\u7c7b\u52a0\u8f7d\u59d4\u6d3e\u6d41\u7a0b\u3002\uff09<\/p>\n\n\n
          \n
          \"\"<\/figure><\/div>\n\n\n
          \u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\u4f5c\u7528\uff1a<\/strong><\/p>\n\n\n\n
          1.\u901a\u8fc7\u59d4\u6d3e\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u907f\u514d\u7c7b\u7684\u91cd\u590d\u52a0\u8f7d\uff0c\u5f53\u7236\u52a0\u8f7d\u5668\u5df2\u7ecf\u52a0\u8f7d\u8fc7\u67d0\u4e00\u4e2a\u7c7b\u65f6\uff0c\u5b50\u52a0\u8f7d\u5668\u5c31\u4e0d\u4f1a\u518d\u91cd\u65b0\u52a0\u8f7d\u8fd9\u4e2a\u7c7b\u3002<\/p>\n\n\n\n
          2.\u901a\u8fc7\u53cc\u4eb2\u59d4\u6d3e\u7684\u65b9\u5f0f\uff0c\u8fd8\u4fdd\u8bc1\u4e86\u5b89\u5168\u6027\u3002\u56e0\u4e3aBootstrap ClassLoader\u5728\u52a0\u8f7d\u7684\u65f6\u5019\uff0c\u53ea\u4f1a\u52a0\u8f7dJAVA_HOME\u4e2d\u7684jar\u5305\u91cc\u9762\u7684\u7c7b\uff0c\u5982java.lang.Integer\u3002\u8fd9\u4e2a\u7c7b\u662f\u4e0d\u4f1a\u88ab\u968f\u610f\u66ff\u6362\u7684\uff0c\u9664\u975e\u6709\u4eba\u7834\u574f\u672c\u673a\u7684JDK\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u907f\u514d\u6709\u4eba\u81ea\u5b9a\u4e49\u4e00\u4e2a\u6709\u7f3a\u9677\u7684java.lang.Integer\u88ab\u52a0\u8f7d\u3002\u53ef\u4ee5\u6709\u6548\u7684\u9632\u6b62\u6838\u5fc3Java API\u88ab\u7be1\u6539\u3002<\/p>\n\n\n\n
          \u3000<\/p>\n\n\n\n
          ClassLoader\u7c7b\u4ecb\u7ecd<\/strong><\/p>\n\n\n\n
          \u5728java\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5e76\u4e0d\u4f1a\u4e00\u6b21\u6027\u52a0\u8f7d\u6240\u6709class\u6587\u4ef6\u8fdb\u5165\u5185\u5b58\u3002 \u800c\u662f\u901a\u8fc7Java\u7684\u7c7b\u52a0\u8f7d\u673a\u5236\uff08ClassLoader\uff09\u8fdb\u884c\u52a8\u6001\u5730\u52a0\u8f7d\u76f8\u5173\u5730\u7c7b\uff0c\u4ece\u800c\u8f6c\u6362\u6210Class\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/strong><\/p>\n\n\n\n
          classloader\u7c7b\u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff0c\u4e3b\u8981\u7684\u529f\u80fd\u662f\u901a\u8fc7\u6307\u5b9a\u5730\u7c7b\u7684\u540d\u79f0\uff0c\u627e\u5230\u6216\u751f\u6210\u5bf9\u5e94\u5730\u5b57\u8282\u7801\u6587\u4ef6\u3002<\/p>\n\n\n\n
          ClassLoader\u7c7b\u4e2d\u548c\u52a0\u8f7d\u7c7b\u76f8\u5173\u65b9\u6cd5<\/strong><\/p>\n\n\n\n
          \u65b9\u6cd5<\/th>\u8bf4\u660e<\/th><\/tr><\/thead>
          getParent()<\/td>\u8fd4\u56de\u8be5\u7c7b\u52a0\u8f7d\u5668\u5730\u7236\u7c7b\u52a0\u8f7d\u5668<\/td><\/tr>
          loadClass(String name)<\/td>\u52a0\u8f7d\u540d\u79f0\u4e3aname\u7684\u7c7b\uff0c\u8fd4\u56de\u7684\u7ed3\u679c\u4e3ajava.lang.Class\u7c7b\u7684\u5b9e\u4f8b<\/td><\/tr>
          findClass(String name)<\/td>\u67e5\u627e\u540d\u79f0\u4e3aname\u7684\u7c7b\uff0c\u8fd4\u56de\u7684\u7ed3\u679c\u662fjava.lang.Class\u7c7b\u7684\u5b9e\u4f8b<\/td><\/tr>
          findLoadedClass(String name)<\/td>\u67e5\u627e\u540d\u79f0\u4e3aname\u7684\u5df2\u88ab\u52a0\u8f7d\u8fc7\u7684\u7c7b\u3002\u8fd4\u56de\u7ed3\u679c\u662fjava.lang.Class\u7c7b\u7684\u5b9e\u4f8b<\/td><\/tr>
          resolveClass(Class<?> c)<\/td>\u94fe\u63a5\u6307\u5b9a\u4e3aJava\u7c7b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          \u3000\u3000<\/p>\n\n\n\n
          loadClass()\u7c7b\u52a0\u8f7d\u6d41\u7a0b<\/strong><\/strong><\/p>\n\n\n\n
          loadClass()\u52a0\u8f7d\u7c7b\u540e\uff0c\u4f1a\u8fd4\u56de\u4e00\u4e2ajava.lang.Class\u7c7b\u5b9e\u4f8b\u3002\u4ee5\u4e0b\u4e3aloadClass()\u65b9\u6cd5\u6e90\u7801\uff0c\u5728\u8c03\u7528\u52a0\u8f7d\u7c7b\u65f6\uff0c\u4f1a\u5148\u57fa\u4e8efindLoadedClass()\u65b9\u6cd5\u5224\u65ad\u662f\u5426\u5df2\u88ab\u52a0\u8f7d\u3002\u82e5\u672a\u52a0\u8f7d\u5219\u4f1a\u53bb\u8c03\u7528\u7236\u7c7b\u52a0\u8f7d\u5668\u53bb\u8fdb\u884c\u52a0\u8f7d\uff0c\u82e5\u6ca1\u6709\u5219\u59d4\u6258\u7ed9BootstrapClassLoader\u8fdb\u884c\u52a0\u8f7d \u3002\u82e5\u4e5f\u4e0d\u5b58\u5728\uff0c\u5219\u81ea\u5df1\u8fdb\u884c\u8c03\u7528findClass()\u8fdb\u884c\u52a0\u8f7d \u3002 \u4e5f\u5c31\u662f\u53ef\u4ee5\u5bf9findClass()\u65b9\u6cd5\u91cd\u5199 \uff0c\u6765\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u6d41\u7a0b\u3002<\/p>\n\n\n\n
          protected Class<?> loadClass(String name, boolean resolve)\n    throws ClassNotFoundException{\n    synchronized (getClassLoadingLock(name)) {\n        \/\/ 1\u3001\u67e5\u770b\u8be5\u7c7b\u662f\u5426\u52a0\u8f7d\n        Class<?> c = findLoadedClass(name);\n        if (c == null) {\n            long t0 = System.nanoTime();\n            try {\n                \/\/ 2\u3001\u5982\u679c\u672a\u52a0\u8f7d\uff0c\u59d4\u6258\u7ed9\u7236\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\n                if (parent != null) {\n                    c = parent.loadClass(name, false);\n                } else {\n                    \/\/3\u3001\u6ca1\u6709\u7236\u7c7b\u52a0\u8f7d\u5668\uff0c\u59d4\u6258\u7ed9BootstrapClassLoader\n                    c = findBootstrapClassOrNull(name);\n                }\n            } catch (ClassNotFoundException e) {\n            }\n\n            if (c == null) {\n                \/\/ \u7236\u7c7b\u52a0\u8f7d\u5668\u6ca1\u6709\u52a0\u8f7d\u5230\uff0c\u5219\u81ea\u5df1\u52a0\u8f7d\n                long t1 = System.nanoTime();\n                c = findClass(name);\n                \/\/ \u8bb0\u5f55\u8be5\u7c7b\u52a0\u8f7d\u7684\u72b6\u6001Stat. \n                sun.misc.PerfCounter.getParentDelegationTime().addTime(t1 - t0);\n                sun.misc.PerfCounter.getFindClassTime().addElapsedTimeFrom(t1);\n                sun.misc.PerfCounter.getFindClasses().increment();\n            }\n        }\n        \/\/ resolve \uff1atrue,\u9700\u8981\u5bf9\u7c7b\u8fdb\u884c\u94fe\u63a5\uff08\u94fe\u63a5\u9636\u6bb5\u5305\u62ec\uff1a\u51c6\u5907\uff0c\u89e3\u6790\uff0c\u521d\u59cb\u5316\u7c7b\uff09\n        if (resolve) {\n            resolveClass(c);\n        }\n        return c;\n    }\n}\n<\/pre>\n\n\n\n
          \u3000<\/p>\n\n\n\n
          loadClass()\u65b9\u6cd5\u4e0eClass.forName()\u7684\u533a\u522b<\/strong><\/p>\n\n\n\n
          loadClass()\u65b9\u6cd5\u53ea\u5bf9\u7c7b\u8fdb\u884c\u52a0\u8f7d\uff0c\u4e0d\u4f1a\u5bf9\u7c7b\u8fdb\u884c\u521d\u59cb\u5316\u3002Class.forName()\u4f1a\u9ed8\u8ba4\u5bf9\u7c7b\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u5728\u8fdb\u884c\u521d\u59cb\u5316\u65f6\uff0c\u9759\u6001\u4ee3\u7801\u5757\u4e2d\u7684\u4ee3\u7801\u4f1a\u8fdb\u884c\u6267\u884c \u3002<\/strong><\/p>\n\n\n\n
          \u3000<\/p>\n\n\n\n
          \uff085\uff09\u53cd\u5c04\u5173\u952e\u7c7b\u4ecb\u7ecd<\/strong><\/p>\n\n\n\n
          \u7c7b<\/th>\u542b\u4e49<\/th>\u4f5c\u7528<\/th><\/tr><\/thead>
          java.lang.Class<\/td>\u4ee3\u8868\u6574\u4e2a\u5b57\u8282\u7801\u3002\u4ee3\u8868\u4e00\u4e2a\u7c7b\u578b\uff0c\u4ee3\u8868\u6574\u4e2a\u7c7b<\/td>\u53cd\u5c04\u7684\u6838\u5fc3\u7c7b\uff0c\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u7c7b\u7684\u5c5e\u6027\u3001\u65b9\u6cd5\u7b49\u4fe1\u606f\u3002<\/td><\/tr>
          java.lang.reflect.Method<\/td>\u4ee3\u8868\u5b57\u8282\u7801\u4e2d\u7684\u65b9\u6cd5\u5b57\u8282\u7801\u3002\u4ee3\u8868\u7c7b\u4e2d\u7684\u65b9\u6cd5\u3002<\/td>\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u7c7b\u4e2d\u65b9\u6cd5\u4fe1\u606f\u6216\u6267\u884c\u65b9\u6cd5\u3002<\/td><\/tr>
          java.lang.reflect.Constructor<\/td>\u4ee3\u8868\u5b57\u8282\u7801\u4e2d\u7684\u6784\u9020\u65b9\u6cd5\u5b57\u8282\u7801\u3002\u4ee3\u8868\u7c7b\u4e2d\u7684\u6784\u9020\u65b9\u6cd5\u3002<\/td>\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u7c7b\u4e2d\u7684\u6784\u9020\u65b9\u6cd5\u3002<\/td><\/tr>
          java.lang.reflect.Field<\/td>\u4ee3\u8868\u5b57\u8282\u7801\u4e2d\u7684\u5c5e\u6027\u5b57\u8282\u7801\u3002\u4ee3\u8868\u7c7b\u4e2d\u7684\u6210\u5458\u53d8\u91cf\u3002\uff08\u9759\u6001\u53d8\u91cf+\u5b9e\u4f8b\u53d8\u91cf\uff09<\/td>\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u548c\u8bbe\u7f6e\u5bf9\u8c61\u7684\u5c5e\u6027\u503c\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          \u3000<\/p>\n\n\n\n
          Class\u7c7b\u4ecb\u7ecd<\/strong><\/p>\n\n\n\n
          \n\n\n\n
          CLass\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u7c7b\uff0c\u53ea\u662f\u5728\u5b9a\u4e49\u7c7b\u540d\u65f6\uff0c\u6bd4\u8f83\u62bd\u8c61\u3002\u5b83\u53ef\u4ee5\u7406\u89e3\u4e3a \u5bf9\u8c61\u5728\u7167\u955c\u5b50\u540e\u5728\u955c\u5b50\u4e2d\u5f97\u5230\u7684\u4fe1\u606f\uff1a\u7c7b\u4e2d\u7684\u5c5e\u6027\u3001\u65b9\u6cd5\u548c\u6784\u9020\u5668\u3002 \u4e5f\u5c31\u662f\uff0c\u901a\u8fc7Class\u53ef\u4ee5\u5b8c\u6574\u5730\u5f97\u5230\u4e00\u4e2a\u7c7b\u4e2d\u7684\u6240\u6709\u88ab\u52a0\u8f7d\u7684\u7ed3\u6784\uff1b\u4e3aReflection\u7684\u6839\u6e90\uff0c\u9488\u5bf9\u4efb\u4f55\u60f3\u8981\u53bb\u52a8\u6001\u52a0\u8f7d\u8fd0\u884c\u65f6\u7684\u7c7b\uff0c\u53ea\u6709\u5148\u83b7\u5f97\u76f8\u5e94\u7684Class\u5bf9\u8c61\u3002<\/p>\n\n\n\n
          \u3000<\/p>\n\n\n\n
          \uff081\uff09\u83b7\u53d6\u7c7b\u5bf9\u8c61Class<\/strong><\/p>\n\n\n\n
          \u9996\u5148\uff0c\u7a0b\u5e8f\u6267\u884cjavac.exe\u547d\u4ee4\u540e\uff0c\u4f1a\u751f\u6210\u4e00\u4e2a\u6216\u591a\u4e2a\u5b57\u8282\u7801\u6587\u4ef6\uff08\u6587\u4ef6\u7c7b\u578b\u4e3a.class\uff09\u3002<\/p>\n\n\n\n
          \u7136\u540e\u7a0b\u5e8f\u6267\u884cjava.exe\u547d\u4ee4\u5bf9\u67d0\u4e2aclass\u6587\u4ef6\u8fdb\u884c\u89e3\u6790\u65f6\uff0c\u76f8\u5f53\u4e8e\u8bb2\u67d0\u4e2a\u5b57\u8282\u7801\u6587\u4ef6\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\uff0c\u6b64\u8fc7\u7a0b\u6211\u4eec\u79f0\u4e4b\u4e3a\u7c7b\u7684\u52a0\u8f7d\u8fc7\u7a0b\uff0c\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u7684\u7c7b\u6211\u4eec\u79f0\u4e4b\u4e3a\u8fd0\u884c\u65f6\u7c7b\uff0c\u6b64\u8fd0\u884c\u65f6\u7c7b\u5c31\u4f5c\u4e3aClass\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p>\n\n\n\n
          \u3000<\/p>\n\n\n\n
          \u83b7\u53d6\u7c7b\u5bf9\u8c61Class\u5b9e\u4f8b\u76844\u79cd\u65b9\u5f0f<\/strong><\/p>\n\n\n\n
            \n
          • 1.\u4f7f\u7528forName()\u65b9\u6cd5\uff0c\u53ea\u9700\u8981\u7c7b\u540d\u79f0\u5373\u53ef\uff0c\u4f7f\u7528\u8f83\u4e3a\u65b9\u4fbf\uff0c\u62d3\u5c55\u6027\u66f4\u5f3a\u3002<\/li>\n\n\n\n
          • 2.\u76f4\u63a5\u83b7\u53d6\uff0c\u4efb\u4f55\u7c7b\u90fd\u5177\u5907\u9759\u6001\u7684\u5c5e\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528.class\uff0c\u76f4\u63a5\u83b7\u53d6\u5176\u5bf9\u5e94\u7684Class\u5bf9\u8c61\u3002<\/li>\n\n\n\n
          • 3.\u4f7f\u7528getClass()\u65b9\u6cd5 \u3002\u53ef\u4ee5\u901a\u8fc7Object\u7c7b\u4e2d\u7684getClass()\u65b9\u6cd5\u6765\u83b7\u53d6\u5b57\u8282\u7801\u5bf9\u8c61\u3002 \u9700\u8981\u5148\u5b9e\u4f8b\u5316\u5bf9\u8c61\u3002<\/li>\n\n\n\n
          • 4.\u4f7f\u7528\u7c7b\u52a0\u8f7d\u5668\uff1agetSystemClassLoader().loadClass()\u65b9\u6cd5<\/li>\n<\/ul>\n\n\n\n
            \u7c7b\u52a0\u8f7d\u5668\u548cforName()\u7c7b\u4f3c\uff0c\u53ea\u8981\u6709\u7c7b\u540d\u5373\u53ef \u3002\u4f46\u662f\u4e0eclass.forName()\u4e2d\u6709\u4e00\u4e9b\u533a\u522b\uff0cforName\u7684\u9759\u6001\u65b9\u6cd5JVM\u4f1a\u88c5\u8f7d\u7c7b\uff0c\u4e14\u4f1a\u6267\u884cstatic\u4ee3\u7801\u5757\u4e2d\u7684\u4ee3\u7801 \uff1b \u800cgetSystemClassLoader().loadClass()\u4e0d\u4f1a\u6267\u884cstatic\u4ee3\u7801\u3002<\/strong><\/p>\n\n\n\n
            public class Test {\n    public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {\n        System.out.println(Class.forName(\"Reflection.domain.person\")); \/\/class.forname\u8c03\u7528\n        System.out.println(person.class); \/\/\u76f4\u63a5\u8c03\u7528\u83b7\u53d6\n        System.out.println(new person().getClass()); \/\/\u4f7f\u7528getClass\u83b7\u53d6\n        System.out.println(ClassLoader.getSystemClassLoader().loadClass(\"Reflection.domain.person\"));\n    }\n}\n\n<\/pre>\n\n\n\n
            \u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff0cClass.forName\u76f4\u63a5\u6267\u884c\u4e86\u9759\u6001\u65b9\u6cd5\uff0c\u5176\u4ed6\u5219\u662f\u8f93\u51fa\u4e86\u7c7b\u8def\u5f84\uff1a<\/p>\n\n\n
            \n
            \"\"<\/figure><\/div>\n\n\n
            \u3000<\/p>\n\n\n\n
            \uff082\uff09\u83b7\u53d6\u65b9\u6cd5Method<\/strong><\/p>\n\n\n\n
            \u83b7\u53d6\u65b9\u6cd5\u7c7b<\/p>\n\n\n\n
            1.getDeclaredMethods()\n\ngetDeclaredMethods\u65b9\u6cd5\u8fd4\u56de\u7c7b\u6216\u63a5\u53e3\u58f0\u660e\u7684\u6240\u6709\u65b9\u6cd5 \uff0c\u4e0d\u5305\u62ec\u7ee7\u627f\u65b9\u6cd5\u3002\n\n2.getMethods()\n\ngetMethods\u65b9\u6cd5\uff0c\u8fd4\u56de\u67d0\u4e2a\u7c7b\u7684\u6240\u6709public\u65b9\u6cd5\uff0c\u5305\u62ec\u5176\u7ee7\u627f\u7c7b\u7684public\u65b9\u6cd5\u3002\n\n3.getMethod()\n\ngetMethod\u65b9\u6cd5\u53ea\u80fd\u8fd4\u56de\u4e00\u4e2a\u7279\u5b9a\u7684\u65b9\u6cd5\u3002\u8fd4\u56de\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u65b9\u6cd5\u540d\u79f0\uff0c\u540e\u9762\u7684\u53c2\u6570\u4e3a\u65b9\u6cd5\u7684\u53c2\u6570\u5bf9\u5e94\u7684Class\u5bf9\u8c61 \u3002\n\n4.getDeclaredMethod()\n\ngetDeclaredMethod\u65b9\u6cd5\u548cgetMethod\u7c7b\u4f3c\uff0c\u90fd\u662f\u53ea\u53bb\u8fd4\u56de\u4e00\u4e2a\u7279\u70b9\u7684\u65b9\u6cd5\u3002<\/pre>\n\n\n\n
            \u83b7\u53d6\u65b9\u6cd5\u6d41\u7a0b<\/p>\n\n\n\n
            \u5f97\u5230\u8fd4\u56de\u7c7b\u578b \u27a1\u5f97\u5230\u65b9\u6cd5\u540d\u79f0\u27a1\u5f97\u5230\u53c2\u6570\u7c7b\u578b\u27a1\u904d\u5386\u8f93\u51fa<\/pre>\n\n\n\n
            \u5229\u7528getDeclaredMethods()\u83b7\u53d6\u904d\u5386\u5982\u4e0b\uff0c\u53ef\u76f4\u63a5\u83b7\u53d6\u6240\u6709\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
            public static void main(String[] args) throws Exception {\n        Class<?> aClass = Class.forName(\"Reflection.domain.person\");\/\/class.forname\u8c03\u7528\n        Method[] methods = aClass.getDeclaredMethods();\n        for (Method m:methods) {\n            System.out.println(m);\n        }\n<\/pre>\n\n\n\n
            \u3000<\/p>\n\n\n\n
            \uff083\uff09\u83b7\u53d6\u6784\u9020\u5668Constructor<\/strong><\/p>\n\n\n\n
            \u83b7\u53d6\u6784\u9020\u5668\u6b65\u9aa4<\/p>\n\n\n\n
            1\u3001\u83b7\u53d6\u5b57\u8282\u7801\u4fe1\u606f\n\n2\u3001\u5de5\u4f5c\u5b57\u8282\u83b7\u53d6\u6784\u9020\u5668\n\n3\u3001\u5faa\u73af\u904d\u5386<\/pre>\n\n\n\n
             public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {\n        Class<?> aClass = Class.forName(\"Reflection.domain.person\");\/\/class.forname\u8c03\u7528\n        Constructor<?>[] constructors = aClass.getConstructors();\n        for (Constructor m:constructors) {\n            System.out.println(m);\n        }\n<\/pre>\n\n\n\n
            \u3000<\/p>\n\n\n\n
            \uff084\uff09\u83b7\u53d6\u7c7b\u6210\u5458\u53d8\u91cf Fileld<\/strong><\/p>\n\n\n\n
            \u83b7\u53d6\u7c7b\u5c5e\u6027\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
                getDeclaredFields() :\u80fd\u83b7\u5f97\u7c7b\u7684\u6210\u5458\u53d8\u91cf\u6570\u7ec4\uff0c\u5305\u62ecpublic\u3001private\u3001\u548cproteced \u3002\u4f46\u4e0d\u5305\u62ec\u7236\u7c7b\u58f0\u660e\u7684\u5b57\u6bb5\u3002\n\n    getDeclaredField():\u53ea\u80fd\u83b7\u5f97\u7c7b\u7684\u5355\u4e2a\u6210\u5458\u53d8\u91cf \u3002\n\n    getFields():\u80fd\u591f\u83b7\u5f97\u67d0\u4e2a\u7c7b\u7684\u6240\u6709\u7684public\u5b57\u6bb5\uff0c\u5305\u62ec\u7236\u7c7b\u4e2d\u7684\u5b57\u6bb5\u3002\n\n    getField():\u53ea\u80fd\u83b7\u5f97\u67d0\u4e2a\u7c7b\u5176\u4e2d\u4e00\u4e2a\u7684public\u5b57\u6bb5 \u3002\n\n<\/pre>\n\n\n\n
            \u83b7\u53d6\u7c7b\u5c5e\u6027\u6b65\u9aa4<\/p>\n\n\n\n
            \u83b7\u53d6\u5b57\u8282\u7801\u4fe1\u606f\u27a1\u83b7\u53d6\u7c7b\u5c5e\u6027\u27a1\u5faa\u73af\u904d\u5386<\/pre>\n\n\n\n
            public static void main(String[] args) throws Exception {\n        Class<?> aClass = Class.forName(\"Reflection.domain.person\");\/\/class.forname\u8c03\u7528\n        Field[] declaredFields = aClass.getDeclaredFields();\n        for (Field m:declaredFields ) {\n            System.out.println(m);\n        }\n    }\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
            \u8f6c\u8f7d\uff1aJava\u5b89\u5168-Java\u53cd\u5c04\u53ca\u7c7b\u52a0\u8f7d \u4e00\u3001\u53cd\u5c04\u4ecb\u7ecd \u8ba1\u7b97\u5668\u6848\u4f8b \u9996\u5148\u5148\u6765\u770b\u6848\u4f8b\uff0c\u57fa\u4e8e\u201c\u6b63\u5c04\u201d\u8c03\u7528\u8ba1\u7b97\u5668\uff1a  […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/18387"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=18387"}],"version-history":[{"count":2,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/18387\/revisions"}],"predecessor-version":[{"id":18398,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/18387\/revisions\/18398"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=18387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=18387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=18387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}