{"id":203957,"date":"2025-05-22T09:58:51","date_gmt":"2025-05-22T01:58:51","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203957\/"},"modified":"2025-05-22T09:58:51","modified_gmt":"2025-05-22T01:58:51","slug":"jdk-%e5%92%8c-cglib-%e5%8a%a8%e6%80%81%e4%bb%a3%e7%90%86%e8%8e%b7%e5%8f%96%e4%bb%a3%e7%90%86%e5%af%b9%e8%b1%a1%e4%b8%ba-null-%e7%9a%84%e5%8e%9f%e5%9b%a0%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203957\/","title":{"rendered":"JDK \u548c CGLib \u52a8\u6001\u4ee3\u7406\u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61\u4e3a Null \u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"

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

JDK \u548c CGLib \u52a8\u6001\u4ee3\u7406\u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61\u4e3a Null \u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f<\/h1>\n

IT\u884c\u4e1a\u76f8\u5bf9\u4e8e\u4e00\u822c\u4f20\u7edf\u884c\u4e1a\uff0c\u53d1\u5c55\u66f4\u65b0\u901f\u5ea6\u66f4\u5feb\uff0c\u4e00\u65e6\u505c\u6b62\u4e86\u5b66\u4e60\uff0c\u5f88\u5feb\u5c31\u4f1a\u88ab\u884c\u4e1a\u6240\u6dd8\u6c70\u3002\u6240\u4ee5\u6211\u4eec\u9700\u8981\u8e0f\u8e0f\u5b9e\u5b9e\u7684\u4e0d\u65ad\u5b66\u4e60\uff0c\u7cbe\u8fdb\u81ea\u5df1\u7684\u6280\u672f\uff0c\u5c24\u5176\u662f\u521d\u5b66\u8005\u3002\u4eca\u5929\u7ed9\u5927\u5bb6\u6574\u7406\u4e86\u300aJDK \u548c CGLib \u52a8\u6001\u4ee3\u7406\u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61\u4e3a Null \u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\u300b\uff0c\u804a\u804a\uff0c\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01<\/p>\n

<\/p>\n

jdk \u52a8\u6001\u4ee3\u7406\u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61\u4e3a null \u7684\u95ee\u9898<\/strong><\/p>\n

jdk \u52a8\u6001\u4ee3\u7406\u901a\u8fc7 proxy.newproxyinstance \u751f\u6210\u4ee3\u7406\u5bf9\u8c61\uff0c\u9700\u8981\u6ee1\u8db3\u4e00\u5b9a\u7684\u6761\u4ef6\uff0c\u5373\u76ee\u6807\u7c7b\u7684\u63a5\u53e3\u5fc5\u987b\u5b9e\u73b0\u81ea\u67d0\u4e2a\u63a5\u53e3\uff08\u4e00\u822c\u662f java.lang.reflect.invocationhandler\uff09\uff0c\u5e76\u4e14\u8be5\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u5168\u90e8\u88ab null \u8986\u76d6\u3002<\/p>\n

\u5728\u4f60\u7684\u4ee3\u7801\u4e2d\uff0cinvocationhandler \u4e2d\u7684\u65b9\u6cd5\u90fd\u88ab null \u8986\u76d6\u4e86\uff0c\u4f46\u8fd9\u5bfc\u81f4\u4e86\u4e00\u4e2a\u95ee\u9898\uff1a\u65e0\u6cd5\u4ece\u4ee3\u7406\u5bf9\u8c61\u4e2d\u8c03\u7528\u5b9e\u9645\u7684\u76ee\u6807\u65b9\u6cd5\u3002\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u9700\u8981\u5728 invocationhandler \u4e2d\u8986\u76d6 invoke \u65b9\u6cd5\uff0c\u5e76\u8c03\u7528\u76ee\u6807\u65b9\u6cd5\u3002<\/p>\n

\u4fee\u6539\u540e\u7684 invocationhandler\uff1a<\/p>\n

invocationhandler h = new invocationhandler() {\n\n    @override\n    public object invoke(object proxy, method method, object[] args) throws throwable {\n        return method.invoke(target, args);\n    }\n\n};<\/pre>\n
cglib \u52a8\u6001\u4ee3\u7406\u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61\u4e3a null \u7684\u95ee\u9898<\/strong><\/p>\n
cglib \u52a8\u6001\u4ee3\u7406\u4e0d\u9700\u8981\u76ee\u6807\u7c7b\u5b9e\u73b0\u63a5\u53e3\uff0c\u800c\u662f\u76f4\u63a5\u7ee7\u627f\u76ee\u6807\u7c7b\u7684\u5b57\u8282\u7801\uff0c\u7136\u540e\u91cd\u5199\u76ee\u6807\u7c7b\u4e2d\u7684\u65b9\u6cd5\u3002<\/p>\n
\u5728\u4f60\u7684\u4ee3\u7801\u4e2d\uff0cmethodinterceptor \u4e2d\u7684\u65b9\u6cd5\u5168\u90e8\u88ab null \u8986\u76d6\u4e86\uff0c\u8fd9\u4e0e jdk \u52a8\u6001\u4ee3\u7406\u4e2d invocationhandler \u4e2d\u7684\u65b9\u6cd5\u5168\u90e8\u88ab null \u8986\u76d6\u7c7b\u4f3c\uff0c\u4f1a\u5bfc\u81f4\u65e0\u6cd5\u4ece\u4ee3\u7406\u5bf9\u8c61\u4e2d\u8c03\u7528\u5b9e\u9645\u7684\u76ee\u6807\u65b9\u6cd5\u3002<\/p>\n
\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u9700\u8981\u5728 methodinterceptor \u4e2d\u8986\u76d6 intercept \u65b9\u6cd5\uff0c\u5e76\u8c03\u7528\u76ee\u6807\u65b9\u6cd5\u3002<\/p>\n
\u4fee\u6539\u540e\u7684 methodinterceptor\uff1a<\/p>\n
MethodInterceptor methodInterceptor = new MethodInterceptor() {\n\n    @Override\n    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {\n        return method.invoke(target, args);\n    }\n\n};<\/pre>\n
\u4eca\u5929\u5173\u4e8e\u300aJDK \u548c CGLib \u52a8\u6001\u4ee3\u7406\u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61\u4e3a Null \u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
JDK \u548c CGLib \u52a8\u6001\u4ee3\u7406...<\/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-203957","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203957","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=203957"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203957\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203957"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203957"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}