{"id":202839,"date":"2025-05-22T10:53:49","date_gmt":"2025-05-22T02:53:49","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202839\/"},"modified":"2025-05-22T10:53:49","modified_gmt":"2025-05-22T02:53:49","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-java-%e5%8f%8d%e5%b0%84%e4%b8%ad%e5%a4%84%e7%90%86%e5%bc%82%e5%b8%b8%e4%bb%a5%e9%81%bf%e5%85%8d%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e5%b4%a9%e6%ba%83%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202839\/","title":{"rendered":"\u5982\u4f55\u5728 Java \u53cd\u5c04\u4e2d\u5904\u7406\u5f02\u5e38\u4ee5\u907f\u514d\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5982\u4f55\u5728 Java \u53cd\u5c04\u4e2d\u5904\u7406\u5f02\u5e38\u4ee5\u907f\u514d\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\uff1f<\/h1>\n

\u7f16\u7a0b\u5e76\u4e0d\u662f\u4e00\u4e2a\u673a\u68b0\u6027\u7684\u5de5\u4f5c\uff0c\u800c\u662f\u9700\u8981\u6709\u601d\u8003\uff0c\u6709\u521b\u65b0\u7684\u5de5\u4f5c\uff0c\u8bed\u6cd5\u662f\u56fa\u5b9a\u7684\uff0c\u4f46\u89e3\u51b3\u95ee\u9898\u7684\u601d\u8def\u5219\u662f\u4f9d\u9760\u4eba\u7684\u601d\u7ef4\uff0c\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u575a\u6301\u5b66\u4e60\u548c\u66f4\u65b0\u81ea\u5df1\u7684\u77e5\u8bc6\u3002\u4eca\u5929\u5c31\u6574\u7406\u5206\u4eab\u300a\u5982\u4f55\u5728 Java \u53cd\u5c04\u4e2d\u5904\u7406\u5f02\u5e38\u4ee5\u907f\u514d\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\uff1f\u300b\uff0c\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\uff0c\u5728\u8fd9\u53ef\u4ee5\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5f00\u53d1\u80fd\u529b\u7684\u63d0\u5347\u3002<\/p>\n

\u56de\u7b54\uff1a \u901a\u8fc7\u4f7f\u7528\u6700\u4f73\u5b9e\u8df5\uff0c\u53ef\u4ee5\u6709\u6548\u5904\u7406 Java \u53cd\u5c04\u4e2d\u7684\u5f02\u5e38\uff0c\u907f\u514d\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\u3002\u5b9e\u8df5\u5185\u5bb9\uff1a\u4f7f\u7528 try-catch \u5757\u6355\u83b7\u5f02\u5e38\u3002\u68c0\u67e5\u65b9\u6cd5\u7684\u53ef\u8bbf\u95ee\u6027\u3002\u8c28\u614e\u4f7f\u7528 setAccessible(true)\u3002\u521b\u5efa\u5e76\u9075\u5faa\u7f16\u7a0b\u7ea6\u5b9a\u3002<\/p>\n

<\/p>\n

\u5982\u4f55\u5de7\u5999\u5904\u7406 Java \u53cd\u5c04\u4e2d\u7684\u5f02\u5e38\uff0c\u907f\u514d\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83<\/strong><\/p>\n

\u7b80\u4ecb<\/strong><\/p>\n

Java \u53cd\u5c04\u662f\u4e00\u9879\u5f3a\u5927\u7684\u6280\u672f\uff0c\u53ef\u4ee5\u8ba9\u4ee3\u7801\u5728\u8fd0\u884c\u65f6\u68c0\u67e5\u3001\u4fee\u6539\u548c\u5b9e\u4f8b\u5316\u7c7b\u3002\u4f46\u662f\uff0c\u4e0d\u6b63\u5f53\u5730\u4f7f\u7528\u53cd\u5c04\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0d\u53ef\u9884\u6d4b\u7684\u5f02\u5e38\uff0c\u4ece\u800c\u5bfc\u81f4\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\u3002\u672c\u6587\u4ecb\u7ecd\u4e86\u9ad8\u6548\u5904\u7406\u53cd\u5c04\u4e2d\u5f02\u5e38\u7684\u6700\u4f73\u5b9e\u8df5\uff0c\u5e76\u901a\u8fc7\u5b9e\u6218\u6848\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u907f\u514d\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n

\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n

\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\u6bb5\uff0c\u5b83\u5c1d\u8bd5\u901a\u8fc7\u53cd\u5c04\u8c03\u7528\u79c1\u6709\u65b9\u6cd5 encode()<\/code>\uff1a<\/p>\n

import java.lang.reflect.*;\n\nclass MyClass {\n    private String encode() { ... }\n}\n\n\/\/ \u5728\u8fd0\u884c\u65f6\u8c03\u7528\u79c1\u6709\u65b9\u6cd5\npublic static void main(String[] args) {\n    Class<?> clazz = MyClass.class;\n    Method method = clazz.getDeclaredMethod(\"encode\");\n    method.setAccessible(true);\n    String result = (String) method.invoke(new MyClass());\n}<\/pre>\n
\u8fd0\u884c\u8fd9\u6bb5\u4ee3\u7801\u4f1a\u5bfc\u81f4 java.lang.IllegalAccessException<\/code> \u5f02\u5e38\uff0c\u56e0\u4e3a encode()<\/code> \u662f\u4e00\u4e2a\u79c1\u6709\u65b9\u6cd5\u3002<\/p>\n
\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n
\u4e3a\u4e86\u907f\u514d\u6b64\u7c7b\u5f02\u5e38\uff0c\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u6700\u4f73\u5b9e\u8df5\uff1a<\/p>\n
    \n
  • \u4f7f\u7528 try-catch<\/code> \u5757\uff1a<\/strong>\u4f7f\u7528 try-catch<\/code> \u5757\u6765\u6355\u83b7\u53ef\u80fd\u7684\u5f02\u5e38\u3002<\/li>\n
  • \u68c0\u67e5\u53ef\u8bbf\u95ee\u6027\uff1a<\/strong>\u4f7f\u7528 method.canAccess(instance)<\/code> \u68c0\u67e5\u65b9\u6cd5\u662f\u5426\u5df2\u8bbe\u4e3a\u53ef\u8bbf\u95ee\u3002\u5982\u679c\u4e0d\u53ef\u8bbf\u95ee\uff0c\u629b\u51fa\u5f02\u5e38\u3002<\/li>\n
  • \u4f7f\u7528 setAccessible(true)<\/code> \u8c28\u614e\uff1a<\/strong>\u53ea\u6709\u5728\u7edd\u5bf9\u5fc5\u8981\u65f6\u624d\u4f7f\u7528 setAccessible(true)<\/code>\u3002\u5728\u751f\u4ea7\u4ee3\u7801\u4e2d\u5e94\u907f\u514d\u4f7f\u7528\u5b83\u3002<\/li>\n
  • \u5229\u7528\u7f16\u7a0b\u7ea6\u5b9a\uff1a<\/strong>\u521b\u5efa\u7ea6\u5b9a\u5e76\u9075\u5faa\u5b83\u4eec\u6765\u7ba1\u7406\u53cd\u5c04\u4e2d\u8bbf\u95ee\u6743\u9650\u3002<\/li>\n<\/ul>\n
    \u4fee\u6539\u540e\u7684\u4ee3\u7801<\/strong><\/p>\n
    \u91c7\u7528\u8fd9\u4e9b\u6700\u4f73\u5b9e\u8df5\u540e\uff0c\u4fee\u6539\u540e\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    import java.lang.reflect.*;\n\nclass MyClass {\n    private String encode() { ... }\n}\n\n\/\/ \u5728\u8fd0\u884c\u65f6\u8c03\u7528\u79c1\u6709\u65b9\u6cd5\npublic static void main(String[] args) {\n    Class<?> clazz = MyClass.class;\n    Method method = clazz.getDeclaredMethod(\"encode\");\n    if (!method.canAccess(new MyClass())) {\n        throw new IllegalAccessException(\"Method is not accessible\");\n    }\n    String result = (String) method.invoke(new MyClass());\n}<\/pre>\n
    \u7ed3\u8bba<\/strong><\/p>\n
    \u901a\u8fc7\u91c7\u7528\u4e0a\u8ff0\u6700\u4f73\u5b9e\u8df5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5904\u7406 Java \u53cd\u5c04\u4e2d\u7684\u5f02\u5e38\uff0c\u907f\u514d\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\u5e76\u786e\u4fdd\u4ee3\u7801\u7684\u9c81\u68d2\u6027\u3002\u5c3d\u7ba1\u53cd\u5c04\u662f\u4e00\u9879\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u4f46\u8c28\u614e\u4f7f\u7528\u5e76\u9075\u5faa\u9002\u5f53\u7684\u6307\u5bfc\u65b9\u9488\u81f3\u5173\u91cd\u8981\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5982\u4f55\u5728 Java \u53cd\u5c04\u4e2d\u5904\u7406\u5f02\u5e38...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202839","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202839","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202839"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202839\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}