{"id":37,"date":"2026-03-14T22:23:29","date_gmt":"2026-03-14T14:23:29","guid":{"rendered":"http:\/\/47.118.30.30\/?p=37"},"modified":"2026-03-15T11:40:56","modified_gmt":"2026-03-15T03:40:56","slug":"java%e4%bb%a3%e7%90%86","status":"publish","type":"post","link":"https:\/\/arknight.wiki\/index.php\/2026\/03\/14\/java%e4%bb%a3%e7%90%86\/","title":{"rendered":"java\u4ee3\u7406"},"content":{"rendered":"

java\u4ee3\u7406<\/h1>\n

\u9759\u6001\u4ee3\u7406\uff1a<\/h2>\n

\u6b65\u9aa4\uff1a<\/p>\n

    \n
  1. \u5b9a\u4e49\u63a5\u53e3\u3002<\/li>\n
  2. \u7f16\u5199\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\uff08\u76ee\u6807\u7c7b\uff09\u3002<\/li>\n
  3. \u7f16\u5199\u4ee3\u7406\u7c7b\uff0c\u5b9e\u73b0\u63a5\u53e3\u5e76\u6301\u6709\u76ee\u6807\u7c7b\u7684\u5f15\u7528\u3002<\/li>\n
  4. \u5728\u4ee3\u7406\u7c7b\u4e2d\uff0c\u901a\u8fc7\u76ee\u6807\u7c7b\u7684\u5f15\u7528\u8c03\u7528\u5b9e\u9645\u7684\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n

    \u5b9e\u4f8b\uff1a<\/p>\n

    \/\/ \u5b9a\u4e49\u63a5\u53e3\npublic interface Hello {\n    void morning(String name);\n}\n\n\/\/ \u76ee\u6807\u7c7b\npublic class HelloWorld implements Hello {\n    @Override\n    public void morning(String name) {\n        System.out.println(\"Good morning, \" + name);\n    }\n}\n\n\/\/ \u4ee3\u7406\u7c7b\npublic class HelloProxy implements Hello {\n    \/\/ \u5185\u90e8\u7ef4\u62a4\u4e00\u4e2a\u76ee\u6807\u4ee3\u7406\u5bf9\u8c61\u7684\u5c5e\u6027\u5b57\u6bb5\n    private Hello target;\n    public HelloProxy(Hello target) {\n        this.target = target;\n    }\n\n    @Override\n    public void morning(String name) {\n        System.out.println(\"Before method invoke...\");\n        target.morning(name); \/\/ \u8c03\u7528\u76ee\u6807\u7c7b\u65b9\u6cd5\n        System.out.println(\"After method invoke...\");\n    }\n}\n\n\/\/ \u6d4b\u8bd5\u9759\u6001\u4ee3\u7406\npublic class Main {\n    public static void main(String[] args) {\n        Hello target = new HelloWorld();       \/\/ \u521b\u5efa\u76ee\u6807\u5bf9\u8c61\n        Hello proxy = new HelloProxy(target); \/\/ \u521b\u5efa\u4ee3\u7406\u5bf9\u8c61\n        proxy.morning(\"Bob\");                 \/\/ \u8c03\u7528\u4ee3\u7406\u65b9\u6cd5\n    }\n}<\/code><\/pre>\n
    \u52a8\u6001\u4ee3\u7406\uff1a<\/h2>\n
    \u6b65\u9aa4\uff1a<\/p>\n
      \n
    1. \u5b9a\u4e49\u63a5\u53e3\u3002<\/li>\n
    2. \u521b\u5efaInvocationHandler<\/code>\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\uff0c\u7528\u6765\u5904\u7406\u65b9\u6cd5\u8c03\u7528\u3002<\/li>\n
    3. \u4f7f\u7528Proxy.newProxyInstance()<\/code>\u751f\u6210\u52a8\u6001\u4ee3\u7406\u5bf9\u8c61\u3002<\/li>\n<\/ol>\n
      \u5b9e\u4f8b\uff1a<\/p>\n
      import java.lang.reflect.InvocationHandler;\nimport java.lang.reflect.Method;\nimport java.lang.reflect.Proxy;\n\/\/ \u5b9a\u4e49\u63a5\u53e3\npublic interface Hello {\n    void morning(String name);\n}\n\/\/ \u6d4b\u8bd5\u52a8\u6001\u4ee3\u7406\npublic class Main {\n    public static void main(String[] args) {\n        \/\/ \u521b\u5efaInvocationHandler\n        InvocationHandler handler = new InvocationHandler() {\n            @Override\n            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {\n                System.out.println(\"Before method invoke...\");\n                if (method.getName().equals(\"morning\")) {\n                    System.out.println(\"Good morning, \" + args[0]);\n                }\n                System.out.println(\"After method invoke...\");\n                return null;\n            }\n        };\n        \/\/ \u521b\u5efa\u52a8\u6001\u4ee3\u7406\u5bf9\u8c61\n        Hello hello = (Hello) Proxy.newProxyInstance(\n            Hello.class.getClassLoader(),     \/\/ \u7c7b\u52a0\u8f7d\u5668\n            new Class[] { Hello.class },      \/\/ \u9700\u8981\u5b9e\u73b0\u7684\u63a5\u53e3\n            handler                           \/\/ \u65b9\u6cd5\u8c03\u7528\u5904\u7406\u5668\n        );\n        \/\/ \u8c03\u7528\u4ee3\u7406\u65b9\u6cd5\n        hello.morning(\"Bob\");\n    }\n}<\/code><\/pre>\n
      \u52a8\u6001\u4ee3\u7406\u672c\u8d28\u4e0a\u662fJVM\u5728\u8fd0\u884c\u65f6\u751f\u6210\u4ee3\u7406\u7c7b\u7684\u5b57\u8282\u7801\uff0c\u5e76\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n
      \u9644\u5e26\u4e00\u4e2ainvoke\u7684\u5b9e\u73b0\uff1a<\/p>\n
      \/\/ \u8fd9\u662f JDK \u81ea\u52a8\u751f\u6210\u7684 $Proxy0 \u7c7b\u7684\u5927\u81f4\u6e90\u7801\npublic final class $Proxy0 extends Proxy implements Hello {\n\n    \/\/ \u4fdd\u5b58 handler \u7684\u53d8\u91cf\n    private InvocationHandler h;\n\n    \/\/ \u4fdd\u5b58 morning \u65b9\u6cd5\u7684 Method \u5bf9\u8c61 (\u9759\u6001\u521d\u59cb\u5316\u65f6\u83b7\u53d6)\n    private static Method m1; \n\n    static {\n        \/\/ \u521d\u59cb\u5316\u65f6\uff0c\u901a\u8fc7\u53cd\u5c04\u83b7\u53d6 Hello.morning \u65b9\u6cd5\u7684\u5143\u6570\u636e\n        m1 = Class.forName(\"Hello\").getMethod(\"morning\", String.class);\n    }\n\n    public $Proxy0(InvocationHandler h) {\n        this.h = h;\n    }\n\n    \/\/ \u4f60\u8c03\u7528\u7684 morning \u65b9\u6cd5\u5b9e\u9645\u4e0a\u6267\u884c\u7684\u662f\u8fd9\u6bb5\u4ee3\u7801\uff01\n    public final void morning(String name) {\n        try {\n            \/\/ \u5173\u952e\u5728\u8fd9\u91cc\uff1a\u5b83\u81ea\u52a8\u8c03\u7528\u4e86 handler.invoke()\n            \/\/ \u5b83\u628a method \u5bf9\u8c61\u3001\u53c2\u6570\u6570\u7ec4\u6253\u5305\u4f20\u8fdb\u53bb\n            h.invoke(this, m1, new Object[]{name});\n            return;\n        } catch (RuntimeException e) {\n            throw e;\n        } catch (Throwable e) {\n            throw new UndeclaredThrowableException(e);\n        }\n    }\n}<\/code><\/pre>\n
      \u5bf9\u6bd4\uff1a<\/h2>\n\n\n\n\n\n\n\n\n\n
      \u7279\u70b9<\/strong><\/th>\n\u9759\u6001\u4ee3\u7406<\/strong><\/th>\n\u52a8\u6001\u4ee3\u7406<\/strong><\/th>\n<\/tr>\n<\/thead>\n
      \u4ee3\u7406\u7c7b\u5b9e\u73b0\u65b9\u5f0f<\/strong><\/td>\n\u7f16\u8bd1\u65f6\u5b9a\u4e49\u4ee3\u7406\u7c7b<\/td>\n\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u4ee3\u7406\u7c7b<\/td>\n<\/tr>\n
      \u5bf9\u63a5\u53e3\u7684\u652f\u6301<\/strong><\/td>\n\u6bcf\u4e2a\u63a5\u53e3\u9700\u8981\u5355\u72ec\u5b9e\u73b0\u4ee3\u7406\u7c7b<\/td>\n\u53ef\u901a\u7528\uff0c\u53ea\u9700\u5b9e\u73b0InvocationHandler<\/code><\/td>\n<\/tr>\n
      \u4ee3\u7801\u6269\u5c55\u6027<\/strong><\/td>\n\u4f4e\uff0c\u65b0\u589e\u63a5\u53e3\u65f6\u9700\u589e\u52a0\u4ee3\u7406\u7c7b<\/td>\n\u9ad8\uff0c\u53ea\u9700\u66f4\u6539\u4ee3\u7406\u903b\u8f91\u5373\u53ef<\/td>\n<\/tr>\n
      \u6027\u80fd\u5f00\u9500<\/strong><\/td>\n\u65e0\u9700\u53cd\u5c04\uff0c\u6027\u80fd\u8f83\u9ad8<\/td>\n\u4f9d\u8d56\u53cd\u5c04\u8c03\u7528\uff0c\u6027\u80fd\u7565\u4f4e<\/td>\n<\/tr>\n
      \u5e94\u7528\u573a\u666f<\/strong><\/td>\n\u5c0f\u578b\u9879\u76ee\u6216\u63a5\u53e3\u7a33\u5b9a\u7684\u573a\u666f<\/td>\n\u5927\u578b\u9879\u76ee\u3001\u52a8\u6001\u6269\u5c55\u529f\u80fd\u7684\u573a\u666f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"
      java\u4ee3\u7406 \u9759\u6001\u4ee3\u7406\uff1a \u6b65\u9aa4\uff1a \u5b9a\u4e49\u63a5\u53e3\u3002 \u7f16\u5199\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\uff08\u76ee\u6807\u7c7b\uff09\u3002 \u7f16\u5199\u4ee3\u7406\u7c7b\uff0c\u5b9e\u73b0\u63a5\u53e3\u5e76\u6301\u6709\u76ee\u6807\u7c7b\u7684 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-37","post","type-post","status-publish","format-standard","hentry","category-3"],"_links":{"self":[{"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/posts\/37","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/comments?post=37"}],"version-history":[{"count":1,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/posts\/37\/revisions"}],"predecessor-version":[{"id":38,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/posts\/37\/revisions\/38"}],"wp:attachment":[{"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/media?parent=37"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/categories?post=37"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/arknight.wiki\/index.php\/wp-json\/wp\/v2\/tags?post=37"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}