{"id":85463,"date":"2026-07-27T15:41:27","date_gmt":"2026-07-27T07:41:27","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/85463.html"},"modified":"2026-07-27T15:41:27","modified_gmt":"2026-07-27T07:41:27","slug":"15-%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9aspring-aop-%e7%94%a8-jdk-%e4%bb%a3%e7%90%86%e8%bf%98%e6%98%af-cglib%ef%bc%9f%e4%bd%a0%e7%ad%94%e5%af%b9%e4%ba%86%e4%bd%86%e6%b2%a1%e8%af%b4%e4%b8%ba%e4%bb%80","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/85463.html","title":{"rendered":"15 \u9762\u8bd5\u5b98\uff1aSpring AOP \u7528 JDK \u4ee3\u7406\u8fd8\u662f CGLIB\uff1f\u4f60\u7b54\u5bf9\u4e86\u4f46\u6ca1\u8bf4\u4e3a\u4ec0\u4e48"},"content":{"rendered":"

\u6458\u8981：\u672c\u6587\u6df1\u5165\u5256\u6790 Spring AOP \u7684\u4ee3\u7406\u673a\u5236，\u4ece JDK \u52a8\u6001\u4ee3\u7406\u4e0e CGLIB \u7684\u672c\u8d28\u5dee\u5f02\u3001Spring \u7684\u4ee3\u7406\u9009\u62e9\u903b\u8f91\u3001AOP \u901a\u77e5\u94fe\u6267\u884c\u987a\u5e8f，\u5230\u5e38\u89c1\u4ee3\u7406\u5931\u6548\u573a\u666f\u4e0e\u6392\u67e5\u65b9\u6cd5\u3002\u6587\u7ae0\u4e0d\u4ec5\u5bf9\u6bd4\u4e86\u4e24\u79cd\u4ee3\u7406\u65b9\u5f0f\u7684\u5b9e\u73b0\u539f\u7406\u4e0e\u6027\u80fd\u8003\u91cf，\u8fd8\u7ed3\u5408\u6e90\u7801\u89e3\u8bfb\u4e86 Spring \u7684\u4ee3\u7406\u4f18\u5148\u7ea7\u89c4\u5219，\u5e76\u63d0\u4f9b\u4e86\u9762\u8bd5\u6807\u51c6\u56de\u7b54\u4e0e\u5b9e\u6218\u907f\u5751\u6307\u5357，\u5e2e\u52a9\u8bfb\u8005\u5f7b\u5e95\u7406\u89e3 AOP \u4ee3\u7406\u7684\u5e95\u5c42\u884c\u4e3a\u4e0e\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n

\"\"<\/p>\n

\u9762\u8bd5\u95ee Spring AOP，\u5341\u4e2a\u5019\u9009\u4eba\u4e5d\u4e2a\u4e0a\u6765\u5c31\u662f"JDK \u52a8\u6001\u4ee3\u7406\u548c CGLIB"\u3002\u4f60\u8bf4\u51fa\u8fd9\u4e24\u4e2a\u540d\u8bcd\u6211\u53ea\u80fd\u7ed9\u4f60\u5bf9\u52fe，\u4e0d\u4f1a\u7ed9\u52a0\u5206\u3002<\/p>\n

\u4e09\u6863\u7b54\u6848\u7684\u5dee\u8ddd：\u7b2c\u4e00\u6863\u8bf4"\u9ed8\u8ba4 JDK \u52a8\u6001\u4ee3\u7406，\u6ca1\u63a5\u53e3\u7528 CGLIB"\u2014\u2014\u80cc\u7684，\u8ffd\u95ee"\u600e\u4e48\u5f3a\u5236\u5207 CGLIB"\u5c31\u5361\u58f3\u3002\u7b2c\u4e8c\u6863\u8bf4"JDK \u57fa\u4e8e\u63a5\u53e3，CGLIB \u57fa\u4e8e\u7ee7\u627f，Spring Boot 2.0 \u540e\u9ed8\u8ba4 CGLIB"\u2014\u2014\u6709\u4fe1\u606f\u91cf\u4e86，\u4f46\u8fd8\u662f\u6ca1\u56de\u7b54\u6838\u5fc3\u95ee\u9898\u3002\u7b2c\u4e09\u6863，\u662f\u4ece DefaultAopProxyFactory \u6e90\u7801\u4e00\u884c\u884c\u8bf4\u51fa\u4ee3\u7406\u4f18\u5148\u7ea7\u89c4\u5219，\u5e76\u80fd\u89e3\u91ca\u5e95\u5c42\u5b57\u8282\u7801\u884c\u4e3a\u5dee\u5f02\u7684\u4eba\u3002<\/p>\n

\u9762\u8bd5\u5b98\u5fc3\u91cc\u5176\u5b9e\u5728\u7b49\u4e09\u6837\u4e1c\u897f：\u4f60\u77e5\u4e0d\u77e5\u9053\u4ee3\u7406\u7684\u672c\u8d28\u662f"\u8fd0\u884c\u65f6\u521b\u5efa\u5b57\u8282\u7801\u5b50\u7c7b"\u3001\u4f60\u77e5\u4e0d\u77e5\u9053\u5b83\u4e3a\u4ec0\u4e48\u6709\u65f6"\u4e0d\u751f\u6548"\u3001\u4f60\u77e5\u4e0d\u77e5\u9053 Spring \u5728\u4ec0\u4e48\u573a\u666f\u4e0b\u4f1a\u9009\u54ea\u4e2a\u4ee3\u7406\u65b9\u5f0f\u5e76\u7ed9\u51fa\u7406\u7531\u3002 \u8fd9\u4e09\u6837\u7b54\u5168\u4e86，\u8fd9\u9053\u9898\u4f60\u5c31\u62ff\u6ee1\u5206\u4e86\u3002<\/p>\n

\n

\u4ee3\u7406\u6a21\u5f0f\u672c\u8d28：\u5077\u6881\u6362\u67f1<\/h3>\n

\u4f60 @Autowired \u6ce8\u5165\u7684 UserService，\u65e9\u5c31\u4e0d\u662f\u4f60\u81ea\u5df1\u5199\u7684\u90a3\u4e2a UserServiceImpl \u4e86\u2014\u2014\u662f Spring \u5e2e\u4f60\u5305\u7684\u4e00\u5c42\u4ee3\u7406\u5bf9\u8c61\u3002\u4ee3\u7406\u5bf9\u8c61\u5728\u8c03\u771f\u6b63\u65b9\u6cd5\u4e4b\u524d\u63d2\u5165\u4e86\u5207\u9762\u903b\u8f91（\u65e5\u5fd7\u3001\u6743\u9650\u3001\u4e8b\u52a1）\u3002\u4f60\u4ece\u5934\u5230\u5c3e\u6ca1\u611f\u77e5\u5230\u4ee3\u7406\u7684\u5b58\u5728\u2014\u2014\u8fd9\u5c31\u662f AOP\u3002<\/p>\n

\u5177\u4f53\u662f\u600e\u4e48\u5305\u7684？Spring \u5bb9\u5668\u542f\u52a8\u65f6，AbstractAutoProxyCreator（\u4e00\u4e2a BeanPostProcessor）\u5728 Bean \u521d\u59cb\u5316\u7684 postProcessAfterInitialization \u9636\u6bb5，\u68c0\u67e5\u8fd9\u4e2a Bean \u662f\u5426\u9700\u8981\u4ee3\u7406\u2014\u2014\u904d\u5386\u6240\u6709 Advisor，\u7528 Pointcut \u5339\u914d Bean \u7684\u65b9\u6cd5，\u5982\u679c\u547d\u4e2d\u5c31\u521b\u5efa\u4ee3\u7406\u5bf9\u8c61\u66ff\u4ee3\u539f\u59cb Bean\u3002\u8fd9\u4e2a\u66ff\u6362\u8fc7\u7a0b\u662f\u900f\u660e\u7684，\u4f60\u62ff\u5230\u7684\u5f15\u7528\u5df2\u7ecf\u662f\u4ee3\u7406\u4e86\u3002<\/p>\n

\u95ee\u9898\u6765\u4e86：\u8fd9\u5c42\u4ee3\u7406\u5230\u5e95\u600e\u4e48"\u5305"\u51fa\u6765\u7684？<\/p>\n

\n

JDK \u52a8\u6001\u4ee3\u7406：\u5fc5\u987b\u6709\u63a5\u53e3\u2014\u2014\u4ee5\u53ca\u5b83\u5230\u5e95\u751f\u6210\u4e86\u4ec0\u4e48<\/h3>\n

UserService proxy = (UserService) Proxy.newProxyInstance(
\n target.getClass().getClassLoader(),
\n target.getClass().getInterfaces(),
\n (proxy, method, args) -> {
\n System.out.println("\u524d\u7f6e\u589e\u5f3a");
\n return method.invoke(target, args);
\n }
\n);<\/p>\n

Proxy.newProxyInstance() \u5728\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u4e00\u4e2a\u5b9e\u73b0\u4e86\u6307\u5b9a\u63a5\u53e3\u7684\u5b57\u8282\u7801\u7c7b\u3002\u6838\u5fc3\u9650\u5236：\u53ea\u80fd\u4ee3\u7406\u63a5\u53e3\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5，\u5982\u679c\u76ee\u6807\u7c7b\u6709 public \u65b9\u6cd5\u4f46\u4e0d\u5728\u63a5\u53e3\u91cc，\u4ee3\u7406\u5bf9\u8c61\u65e0\u6cd5\u8c03\u7528\u3002\u4e14\u4ee3\u7406\u5bf9\u8c61\u7684\u7c7b\u578b\u662f\u5b9e\u73b0\u7c7b\u63a5\u53e3\u7684\u533f\u540d\u7c7b，\u4e0d\u80fd\u5f3a\u8f6c\u4e3a\u5177\u4f53\u5b9e\u73b0\u7c7b\u2014\u2014UserService proxy \u53ef\u4ee5，UserServiceImpl proxy \u70b8\u3002<\/p>\n

\u4f46\u9762\u8bd5\u5b98\u5982\u679c\u518d\u8ffd\u95ee\u4e00\u53e5"\u751f\u6210\u7684\u4ee3\u7406\u7c7b\u957f\u4ec0\u4e48\u6837"\u2014\u2014\u5927\u90e8\u5206\u4eba\u7b54\u4e0d\u4e0a\u6765\u3002JDK \u52a8\u6001\u4ee3\u7406\u751f\u6210\u7684\u7c7b\u540d\u901a\u5e38\u662f $Proxy0\u3001$Proxy1 \u8fd9\u79cd\u683c\u5f0f，\u5b83\u7684\u7236\u7c7b\u662f java.lang.reflect.Proxy（\u4e0d\u662f\u4f60\u7684\u76ee\u6807\u7c7b！），\u5b9e\u73b0\u4f60\u6307\u5b9a\u7684\u6240\u6709\u63a5\u53e3\u3002\u6bcf\u4e2a\u65b9\u6cd5\u88ab\u8c03\u7528\u65f6\u5b9e\u9645\u8d70\u5230 InvocationHandler.invoke()，\u7531\u4f60\u51b3\u5b9a\u8981\u4e0d\u8981\u8c03\u771f\u5b9e\u5bf9\u8c61\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u7cfb\u7edf\u5c5e\u6027 sun.misc.ProxyGenerator.saveGeneratedFiles=true \u628a\u751f\u6210\u7684\u5b57\u8282\u7801 dump \u51fa\u6765\u770b\u770b\u2014\u2014\u6240\u6709\u65b9\u6cd5\u90fd\u8f6c\u53d1\u7ed9\u4e00\u4e2a InvocationHandler，\u800c\u4f60\u7684\u771f\u5b9e\u5bf9\u8c61\u5c31\u5b58\u5728\u8fd9\u4e2a handler \u91cc\u3002<\/p>\n

\u800c\u4e14\u6709\u4e00\u4e2a\u5f88\u591a\u4eba\u4e0d\u77e5\u9053\u7684\u7ec6\u8282：\u5982\u679c\u4f60\u540c\u65f6\u5b9e\u73b0\u4e86\u591a\u4e2a\u63a5\u53e3，JDK \u4ee3\u7406\u53ea\u4ee3\u7406\u4f60\u901a\u8fc7 @Autowired \u58f0\u660e\u7684\u90a3\u4e2a\u63a5\u53e3\u7c7b\u578b\u7684\u65b9\u6cd5\u3002\u6bd4\u5982 UserService \u548c Auditable \u4e24\u4e2a\u63a5\u53e3，@Autowired UserService proxy \u53ea\u80fd\u8c03 UserService \u7684\u65b9\u6cd5，\u8c03 Auditable \u7684\u65b9\u6cd5\u8981\u7528 ((Auditable) proxy) \u5f3a\u8f6c\u3002\u4f46\u6ce8\u610f\u2014\u2014\u5f3a\u8f6c\u7684\u524d\u63d0\u662f\u751f\u6210\u7684\u4ee3\u7406\u7c7b\u786e\u5b9e\u5b9e\u73b0\u4e86 Auditable \u63a5\u53e3\u3002\u800c Proxy.newProxyInstance \u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4f60\u4f20\u8fdb\u53bb\u7684\u63a5\u53e3\u6570\u7ec4，\u4f60\u4f20\u4e86 UserService.class \u5c31\u53ea\u751f\u6210\u5b9e\u73b0\u4e86 UserService \u7684\u4ee3\u7406\u7c7b，\u5f3a\u8f6c Auditable \u4f1a\u70b8\u3002\u5fc5\u987b\u628a\u4e24\u4e2a\u63a5\u53e3\u90fd\u4f20\u8fdb\u53bb\u3002\u8fd9\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u7ecf\u5e38\u8e29\u5751\u2014\u2014\u4f60\u600e\u4e48\u77e5\u9053 Spring \u5e2e\u4f60\u4f20\u4e86\u54ea\u4e9b\u63a5\u53e3？\u7b54\u6848\u662f Spring \u901a\u8fc7 ClassUtils.getAllInterfaces() \u83b7\u53d6\u76ee\u6807\u7c7b\u7684\u5168\u90e8\u63a5\u53e3（\u5305\u62ec\u7236\u63a5\u53e3），\u6240\u4ee5\u53ea\u8981\u63a5\u53e3\u7ee7\u627f\u5173\u7cfb\u5199\u5bf9\u4e86，\u591a\u4e2a\u63a5\u53e3\u90fd\u80fd\u4ee3\u7406\u3002<\/p>\n

\n

CGLIB：\u9760\u7ee7\u627f\u2014\u2014\u4ee5\u53ca FastClass \u662f\u4ec0\u4e48\u9b3c<\/h3>\n

Enhancer enhancer = new Enhancer();
\nenhancer.setSuperclass(UserServiceImpl.class);
\nenhancer.setCallback((MethodInterceptor) (obj, method, args, proxy) -> {
\n System.out.println("\u524d\u7f6e\u589e\u5f3a");
\n return proxy.invokeSuper(obj, args);
\n});<\/p>\n

\u5e95\u5c42\u7528 ASM \u6846\u67b6\u751f\u6210\u76ee\u6807\u7c7b\u7684\u5b50\u7c7b\u5b57\u8282\u7801\u3002final \u65b9\u6cd5\u548c final \u7c7b\u65e0\u6cd5\u4ee3\u7406\u2014\u2014CGLIB \u5b50\u7c7b\u62ff\u4e0d\u5230\u7236\u7c7b\u7684 final \u65b9\u6cd5，\u5207\u9762\u4f1a\u9759\u9ed8\u8df3\u8fc7\u4e0d\u62a5\u9519（\u6392\u67e5\u5de8\u5751）\u3002CGLIB \u7684 invokeSuper \u8d70 FastClass \u7d22\u5f15\u800c\u975e\u53cd\u5c04，\u8c03\u7528\u6027\u80fd\u7406\u8bba\u4e0a\u6bd4 JDK \u4ee3\u7406\u66f4\u9ad8\u3002<\/p>\n

\u8bf4"\u7406\u8bba\u4e0a"\u662f\u56e0\u4e3a JDK \u4ee3\u7406\u5728 JVM \u5c42\u9762\u7684\u4f18\u5316\u975e\u5e38\u6fc0\u8fdb\u3002JDK \u4ee3\u7406\u7684 InvocationHandler.invoke() \u8c03\u7528\u5728 JIT \u7f16\u8bd1\u540e\u53ef\u4ee5\u88ab\u5185\u8054\u2014\u2014method.invoke() \u5728\u70ed\u70b9\u4ee3\u7801\u8def\u5f84\u4e0a JVM \u4f1a\u505a\u504f\u5411\u9501\u6d88\u9664\u548c\u53cd\u5c04\u8c03\u7528\u4f18\u5316\u3002CGLIB \u7684 FastClass \u672c\u8d28\u662f\u4e3a\u6bcf\u4e2a\u65b9\u6cd5\u751f\u6210\u4e00\u4e2a\u7d22\u5f15，\u8c03\u7528\u65f6\u901a\u8fc7\u7d22\u5f15\u76f4\u63a5\u8def\u7531\u5230\u76ee\u6807\u65b9\u6cd5，\u907f\u514d\u4e86\u53cd\u5c04\u7684 Method.invoke() \u5f00\u9500\u2014\u2014\u4f46\u5b83\u9700\u8981\u591a\u7ef4\u62a4\u4e00\u5957\u7d22\u5f15\u7c7b\u3002CGLIB \u4f1a\u4e3a\u76ee\u6807\u7c7b\u548c\u4ee3\u7406\u7c7b\u5404\u751f\u6210\u4e00\u4e2a FastClass：\u76ee\u6807\u7c7b\u7684 FastClass \u8d1f\u8d23"\u6839\u636e\u65b9\u6cd5\u7b7e\u540d\u627e\u5230\u7d22\u5f15"，\u4ee3\u7406\u7c7b\u7684 FastClass \u8d1f\u8d23"\u6839\u636e\u7d22\u5f15\u627e\u5230\u5bf9\u5e94\u7684\u62e6\u622a\u5668\u94fe"\u3002<\/p>\n

\u4e0d\u8fc7\u8bf4\u771f\u7684，\u5728 JDK 8+ \u7684 JIT \u4f18\u5316\u9762\u524d，\u4e24\u8005\u7684\u6027\u80fd\u5dee\u8ddd\u5fae\u4e4e\u5176\u5fae\u3002\u9009 JDK \u4ee3\u7406\u8fd8\u662f CGLIB，\u6027\u80fd\u4e0d\u5e94\u8be5\u6210\u4e3a\u9996\u8981\u7406\u7531\u2014\u2014\u67b6\u6784\u5408\u7406\u6027\u624d\u662f\u3002<\/p>\n

CGLIB \u8fd8\u6709\u4e00\u4e2a callback filter \u673a\u5236（CallbackFilter）：\u4f60\u53ef\u4ee5\u4e3a\u4e0d\u540c\u7684\u65b9\u6cd5\u6307\u5b9a\u4e0d\u540c\u7684\u62e6\u622a\u5668\u3002\u6bd4\u5982 save() \u8d70\u4e8b\u52a1\u4ee3\u7406，find() \u8d70\u7f13\u5b58\u4ee3\u7406\u2014\u2014\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\u80cc\u540e\u6302\u591a\u4e2a CGLIB Callback，\u901a\u8fc7 accept() \u65b9\u6cd5\u8fd4\u56de\u7684\u7d22\u5f15\u6765\u51b3\u5b9a\u8d70\u54ea\u4e2a\u3002Spring \u7684 CglibAopProxy \u5229\u7528\u8fd9\u4e2a\u673a\u5236\u5b9e\u73b0\u4e86"\u5982\u679c\u4e00\u4e2a\u65b9\u6cd5\u4e0d\u9700\u8981\u4ee3\u7406\u5c31\u8df3\u8fc7\u62e6\u622a\u5668\u76f4\u63a5\u8c03\u7528\u539f\u65b9\u6cd5"\u7684\u4f18\u5316\u3002<\/p>\n

\n

Spring \u7684\u4ee3\u7406\u9009\u62e9\u903b\u8f91\u2014\u2014\u6e90\u7801\u4e00\u884c\u884c\u62c6<\/h3>\n

\"\"<\/p>\n

DefaultAopProxyFactory.createAopProxy() \u7684\u89c4\u5219\u975e\u5e38\u7b80\u6d01\u2014\u2014\u5148\u5224\u65ad\u662f\u4e0d\u662f\u63a5\u53e3：<\/p>\n

if (targetClass.isInterface() || Proxy.isProxyClass(targetClass)) {
\n return new JdkDynamicAopProxy(config); \/\/ \u63a5\u53e3\u2192JDK
\n}
\nreturn new ObjenesisCglibAopProxy(config); \/\/ \u5426\u5219\u2192CGLIB<\/p>\n

Spring Boot 2.0 \u8d77 spring.aop.proxy-target-class=true（\u9ed8\u8ba4），\u503e\u5411\u4e8e\u5f3a\u5236\u8d70 CGLIB\u3002\u4f46\u5982\u679c\u7c7b\u5b9e\u73b0\u4e86\u63a5\u53e3\u4e14\u58f0\u660e\u7684\u662f\u63a5\u53e3\u7c7b\u578b\u800c\u975e\u5b9e\u73b0\u7c7b，Spring \u4ecd\u4f1a\u4f18\u5148 JDK \u4ee3\u7406\u3002\u8fd9\u4e2a\u4f18\u5148\u7ea7\u89c4\u5219\u770b\u4f3c\u7b80\u5355，\u5b9e\u9645\u5f00\u53d1\u4e2d\u5f88\u591a\u4eba\u641e\u6df7\u2014\u2014\u4f60 @Autowired UserService（\u63a5\u53e3）\u548c @Autowired UserServiceImpl（\u5b9e\u73b0\u7c7b）\u6ce8\u5165\u7684\u4ee3\u7406\u5bf9\u8c61\u7c7b\u578b\u53ef\u80fd\u5b8c\u5168\u4e0d\u540c\u3002<\/p>\n

\u6df1\u6316\u4e00\u5c42：\u4e3a\u4ec0\u4e48 Spring \u7528 Objenesis \u800c\u4e0d\u662f\u7b80\u5355\u7684 new？\u56e0\u4e3a CGLIB \u751f\u6210\u7684\u5b50\u7c7b\u4e0d\u4e00\u5b9a\u6709\u65e0\u53c2\u6784\u9020\u5668\u3002\u76ee\u6807\u7c7b\u53ef\u80fd\u53ea\u6709\u4e00\u4e2a\u6709\u53c2\u6784\u9020\u5668，\u4f20\u7edf\u7684 constructor.newInstance() \u4f1a\u70b8\u3002Objenesis \u7ed5\u8fc7\u4e86\u6784\u9020\u5668\u76f4\u63a5\u521b\u5efa\u5bf9\u8c61\u5b9e\u4f8b\u2014\u2014\u5b83\u6784\u9020\u51fa\u7684\u4ee3\u7406\u5bf9\u8c61\u6784\u9020\u5668\u4ece\u672a\u88ab\u8c03\u7528\u8fc7\u3002\u8fd9\u4e5f\u610f\u5473\u7740\u5982\u679c\u4f60\u5728\u6784\u9020\u5668\u91cc\u653e\u521d\u59cb\u5316\u903b\u8f91，\u4ee3\u7406\u5bf9\u8c61\u4e0d\u4f1a\u6267\u884c\u5b83\u2014\u2014\u53c8\u662f\u4e00\u4e2a\u9759\u9ed8\u5751\u3002<\/p>\n

\n

AOP \u901a\u77e5\u94fe\u7684\u6267\u884c\u987a\u5e8f\u2014\u2014\u73af\u7ed5\u901a\u77e5\u5230\u5e95\u5305\u4e86\u4ec0\u4e48<\/h3>\n

\"\"<\/p>\n

\u9762\u8bd5\u5b98\u5076\u5c14\u4f1a\u95ee："\u4e94\u4e2a\u901a\u77e5\u7c7b\u578b\u7684\u6267\u884c\u987a\u5e8f\u662f\u4ec0\u4e48？"\u8fd9\u4e0d\u662f\u5728\u8003\u4f60\u8bb0\u5fc6\u529b，\u662f\u5728\u8003\u4f60\u7406\u4e0d\u7406\u89e3 AOP \u7684\u672c\u8d28\u662f"\u6808\u5f0f\u5d4c\u5957\u8c03\u7528"\u3002<\/p>\n

\u6267\u884c\u987a\u5e8f\u662f：@Around（\u524d\u7f6e\u90e8\u5206）\u2192 @Before \u2192 \u76ee\u6807\u65b9\u6cd5 \u2192 @Around（\u540e\u7f6e\u90e8\u5206）\u2192 @After \u2192 @AfterReturning（\u6b63\u5e38\u8fd4\u56de）\u6216 @AfterThrowing（\u629b\u5f02\u5e38）\u3002<\/p>\n

\u5173\u952e\u70b9：@After \u65e0\u8bba\u76ee\u6807\u65b9\u6cd5\u6b63\u5e38\u6267\u884c\u8fd8\u662f\u629b\u5f02\u5e38\u90fd\u4f1a\u6267\u884c，\u7c7b\u4f3c\u4e8e try-catch-finally \u4e2d\u7684 finally \u5757\u3002@AfterReturning \u53ea\u5728\u6b63\u5e38\u8fd4\u56de\u65f6\u6267\u884c，@AfterThrowing \u53ea\u5728\u629b\u5f02\u5e38\u65f6\u6267\u884c\u3002<\/p>\n

\u53e6\u5916，\u591a\u4e2a\u5207\u9762\u65f6\u7684\u6392\u5e8f\u9760 @Order \u6ce8\u89e3\u6216\u5b9e\u73b0 Ordered \u63a5\u53e3\u3002\u6570\u5b57\u8d8a\u5c0f\u4f18\u5148\u7ea7\u8d8a\u9ad8\u2014\u2014@Order(1) \u7684\u5207\u9762\u5728\u6700\u5916\u5c42，@Order(10) \u7684\u5207\u9762\u5728\u6700\u5185\u5c42\u3002\u8fd9\u548c\u540c\u5fc3\u5706\u4e00\u6837：\u6700\u5916\u5c42\u6700\u5148\u6267\u884c\u524d\u7f6e\u3001\u6700\u540e\u6267\u884c\u540e\u7f6e\u3002<\/p>\n

\u9762\u8bd5\u5b98\u53ef\u80fd\u8ffd\u95ee\u7684\u5751：\u5982\u679c @AfterThrowing \u91cc\u53c8\u629b\u4e86\u5f02\u5e38\u4f1a\u600e\u6837？ \u5b83\u4f1a\u8986\u76d6\u539f\u59cb\u5f02\u5e38，\u4ee3\u7406\u8fd4\u56de\u7ed9\u8c03\u7528\u65b9\u7684\u5c31\u662f\u4f60 @AfterThrowing \u91cc\u629b\u51fa\u7684\u5f02\u5e38，\u539f\u59cb\u5f02\u5e38\u88ab\u541e\u4e86\u2014\u2014\u6392\u67e5\u7ebf\u4e0a Bug \u65f6\u7ecf\u5e38\u4ee5\u4e3a\u4ee3\u7406\u903b\u8f91\u6ca1\u95ee\u9898，\u7ed3\u679c\u5f02\u5e38\u6808\u88ab\u66ff\u6362\u4e86\u3002<\/p>\n

\n

\u9009\u9519\u4f1a\u51fa\u4ec0\u4e48\u4e8b\u6545？<\/h3>\n

\u4e8b\u6545\u4e00：JDK \u4ee3\u7406\u5bf9\u8c61\u5f3a\u8f6c\u4e3a\u5b9e\u73b0\u7c7b\u2192ClassCastException\u3002@Autowired UserService（\u63a5\u53e3\u7c7b\u578b）OK，@Autowired UserServiceImpl（\u5b9e\u73b0\u7c7b）\u70b8\u3002<\/p>\n

\u4e8b\u6545\u4e8c：CGLIB \u4ee3\u7406\u7684\u7c7b\u6709 final \u65b9\u6cd5\u2192\u5207\u9762\u4e0d\u751f\u6548，\u9759\u9ed8\u5931\u8d25\u6392\u67e5\u534a\u5929\u3002\u89c1\u8fc7\u6700\u5751\u7684\u7ebf\u4e0a Bug：@Transactional \u4e0d\u751f\u6548，\u4e09\u5c0f\u65f6\u540e\u53d1\u73b0\u6ce8\u89e3\u52a0\u5728 private \u65b9\u6cd5\u4e0a\u2014\u2014CGLIB \u5b50\u7c7b\u62ff\u4e0d\u5230\u7236\u7c7b private \u65b9\u6cd5，\u5207\u9762\u76f4\u63a5\u8df3\u8fc7\u3002<\/p>\n

\u4e8b\u6545\u4e09：\u540c\u4e00\u4e2a Bean \u91cc\u65b9\u6cd5\u81ea\u8c03\u7528 this.methodB()\u2192\u4e0d\u8d70\u4ee3\u7406，\u5207\u9762\u5931\u6548\u3002\u9700\u8981\u7528 AopContext.currentProxy() \u6216\u62c6 Bean \u89e3\u51b3\u3002<\/p>\n

\u4e8b\u6545\u56db（\u8fd9\u4e2a\u89c1\u8fc7\u66f4\u60e8\u7684）：\u6784\u9020\u5668\u6ce8\u5165\u7684\u5faa\u73af\u4f9d\u8d56\u3002A \u9700\u8981 B，B \u9700\u8981 A\u2014\u2014\u6784\u9020\u5668\u6ce8\u5165\u65f6\u53cc\u65b9\u90fd\u9700\u8981\u5bf9\u65b9\u5b8c\u6210\u521d\u59cb\u5316\u624d\u80fd\u6784\u9020\u81ea\u5df1，\u76f4\u63a5\u6b7b\u9501\u3002\u6362\u6210 @Lazy \u6216 setter \u6ce8\u5165\u624d\u80fd\u7ed5\u5f00\u3002\u800c\u4e00\u65e6\u6d89\u53ca\u4ee3\u7406\u5bf9\u8c61\u7684\u5faa\u73af\u4f9d\u8d56，\u573a\u666f\u66f4\u590d\u6742\u2014\u2014\u56e0\u4e3a\u4ee3\u7406\u5bf9\u8c61\u7684\u521b\u5efa\u65f6\u5e8f\u4f1a\u5f71\u54cd\u5faa\u73af\u4f9d\u8d56\u7684\u89e3\u94fe\u3002Spring \u7684\u4e09\u7ea7\u7f13\u5b58（singletonFactories）\u5c31\u662f\u4e3a\u8fd9\u4e2a\u8bbe\u8ba1\u7684，\u4f46\u5982\u679c\u4f60\u4e0d\u77e5\u9053\u4ee3\u7406\u5bf9\u8c61\u5728\u4e09\u7ea7\u7f13\u5b58\u4e2d\u7684\u5730\u4f4d，\u51fa\u4e86\u5faa\u73af\u4f9d\u8d56\u7684 Bug \u4f60\u53ea\u80fd\u6293\u778e\u3002<\/p>\n

\n

Spring AOP vs AspectJ\u2014\u2014\u9762\u8bd5\u5b98\u5728\u7b49\u4f60\u8bf4\u51fa"\u5b83\u4fe9\u4e0d\u662f\u4e00\u4e2a\u4e1c\u897f"<\/h3>\n

\u5f88\u591a\u4eba\u9762\u8bd5\u65f6\u8bf4"Spring AOP \u5c31\u662f AspectJ"\u2014\u2014\u8fd9\u662f\u5178\u578b\u7684\u6df7\u6dc6\u3002Spring AOP \u662f\u57fa\u4e8e\u4ee3\u7406\u7684\u8fd0\u884c\u65f6 AOP，\u53ea\u80fd\u5728 Spring \u5bb9\u5668\u7ba1\u7406\u7684 Bean \u4e0a\u751f\u6548\u3002AspectJ \u662f\u7f16\u8bd1\u671f\u7ec7\u5165，\u901a\u8fc7 ajc \u7f16\u8bd1\u5668\u6216\u7c7b\u52a0\u8f7d\u671f\u7ec7\u5165\u628a\u5207\u9762\u903b\u8f91\u76f4\u63a5\u5199\u5165\u5b57\u8282\u7801\u3002<\/p>\n

\u6700\u76f4\u89c2\u7684\u533a\u522b：Spring AOP \u53ea\u80fd\u4ee3\u7406 Spring Bean \u7684 public \u65b9\u6cd5，AspectJ \u53ef\u4ee5\u5207\u5165\u4efb\u4f55\u7c7b（\u5305\u62ec\u975e Spring \u7ba1\u7406\u7684）\u7684\u4efb\u610f\u65b9\u6cd5（\u5305\u62ec private）\u3002\u4e3a\u4ec0\u4e48？Spring AOP \u9760\u4ee3\u7406\u5bf9\u8c61\u62e6\u622a\u65b9\u6cd5\u8c03\u7528，\u4ee3\u7406\u53ea\u80fd\u8986\u76d6\u5230\u4ee3\u7406\u5bf9\u8c61\u4e0a\u7684\u65b9\u6cd5\u8c03\u7528；AspectJ \u76f4\u63a5\u4fee\u6539\u4e86\u5b57\u8282\u7801，\u65e0\u5dee\u522b\u7ec7\u5165\u3002<\/p>\n

\u4f60\u5982\u679c\u60f3\u8ba9 @Transactional \u5728\u540c\u4e00\u4e2a\u7c7b\u7684\u5185\u90e8\u8c03\u7528\u4e2d\u4e5f\u751f\u6548，Spring AOP \u505a\u4e0d\u5230，\u5fc5\u987b\u62c6 Bean \u6216\u7528 AspectJ \u7684 LTW（Load-Time Weaving）\u3002<\/p>\n

\n

🎯 \u9762\u8bd5\u6807\u51c6\u56de\u7b54<\/h3>\n

"Spring AOP \u901a\u8fc7 DefaultAopProxyFactory \u81ea\u52a8\u9009\u62e9\u4ee3\u7406\u65b9\u5f0f\u3002\u76ee\u6807\u7c7b\u5b9e\u73b0\u4e86\u63a5\u53e3\u4e14\u58f0\u660e\u4e3a\u63a5\u53e3\u7c7b\u578b\u2192JDK \u52a8\u6001\u4ee3\u7406，Proxy.newProxyInstance \u8fd0\u884c\u65f6\u751f\u6210\u63a5\u53e3\u5b9e\u73b0\u7c7b\u5b57\u8282\u7801，\u53ea\u80fd\u4ee3\u7406\u63a5\u53e3\u65b9\u6cd5\u3002\u5426\u5219\u2192CGLIB，\u7528 ASM \u751f\u6210\u76ee\u6807\u7c7b\u7684\u5b50\u7c7b\u5b57\u8282\u7801，\u57fa\u4e8e\u7ee7\u627f\u4e0d\u80fd\u4ee3\u7406 final \u65b9\u6cd5\u6216\u7c7b\u3002Spring Boot 2.0 \u9ed8\u8ba4 proxy-target-class=true \u503e\u5411 CGLIB\u3002\u5173\u952e\u5dee\u5f02：JDK \u57fa\u4e8e\u63a5\u53e3\u4e0d\u80fd\u5f3a\u8f6c\u5b9e\u73b0\u7c7b，CGLIB \u57fa\u4e8e\u7ee7\u627f\u4e0d\u80fd\u4ee3\u7406 final \u4e14\u5185\u90e8\u81ea\u8c03\u7528\u4e0d\u8d70\u4ee3\u7406\u3002CGLIB \u7684 invokeSuper \u8d70 FastClass \u7d22\u5f15\u66ff\u4ee3\u53cd\u5c04\u6027\u80fd\u66f4\u9ad8\u3002\u5b9e\u9645\u5f00\u53d1\u4e2d\u6700\u5bb9\u6613\u8e29\u7684\u5751：private \u65b9\u6cd5\u4e0a @Transactional \u9759\u9ed8\u5931\u6548，\u56e0\u4e3a CGLIB \u5b50\u7c7b\u62ff\u4e0d\u5230\u7236\u7c7b\u79c1\u6709\u65b9\u6cd5\u3002\u901a\u77e5\u6267\u884c\u987a\u5e8f\u662f @Around\u2192@Before\u2192\u76ee\u6807\u65b9\u6cd5\u2192@Around\u540e\u7f6e\u2192@After\u2192@AfterReturning\/@AfterThrowing，\u591a\u5207\u9762\u901a\u8fc7 @Order \u63a7\u5236\u4f18\u5148\u7ea7\u3002Spring AOP \u662f\u8fd0\u884c\u65f6\u4ee3\u7406 AOP，\u53ea\u5bf9 Spring \u7ba1\u7406\u7684 Bean \u7684 public \u65b9\u6cd5\u751f\u6548；AspectJ \u662f\u7f16\u8bd1\u671f\u7ec7\u5165，\u53ef\u4ee5\u7ec7\u5165\u4efb\u610f\u7c7b\u7684\u4efb\u610f\u65b9\u6cd5\u3002"<\/p>\n

\n
\n

AOP \u5931\u6548\u6392\u67e5\u2014\u2014\u9762\u8bd5\u5b98\u6700\u5e38\u73b0\u573a\u51fa\u7684\u9898<\/h3>\n

\u9762\u8bd5\u5230\u6700\u540e，\u9762\u8bd5\u5b98\u53ef\u80fd\u4f1a\u73b0\u573a\u7ed9\u4f60\u4e00\u6bb5\u4ee3\u7801\u8ba9\u4f60\u6311 Bug\u3002\u8fd9\u7c7b\u9898\u7684\u6838\u5fc3\u8003\u70b9\u5c31\u4e00\u4e2a：\u4f60\u77e5\u4e0d\u77e5\u9053\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4ee3\u7406\u4e0d\u751f\u6548\u3002<\/p>\n

\u6700\u5e38\u89c1\u7684\u5957\u8def\u4ee3\u7801：<\/p>\n

@Service
\npublic class OrderService {
\n @Transactional
\n public void createOrder(Order order) {
\n \/\/ \u5199\u8ba2\u5355
\n this.sendNotification(order); \/\/ \u8fd9\u91cc\u7684 @Transactional \u4e0d\u4f1a\u751f\u6548！
\n }<\/p>\n

@Transactional(propagation = Propagation.REQUIRES_NEW)
\n public void sendNotification(Order order) {
\n \/\/ \u53d1\u901a\u77e5
\n }
\n}<\/p>\n

createOrder() \u91cc\u7684 this.sendNotification() \u4e0d\u8d70\u4ee3\u7406\u2014\u2014\u56e0\u4e3a this \u662f OrderService \u672c\u8eab，\u4e0d\u662f\u4ee3\u7406\u5bf9\u8c61\u3002\u4f60\u8c03 this.sendNotification() \u76f8\u5f53\u4e8e\u76f4\u63a5\u8c03\u539f\u59cb\u5bf9\u8c61\u7684 sendNotification()，CGLIB \u90a3\u5c42\u62e6\u622a\u5668\u6839\u672c\u6ca1\u673a\u4f1a\u8fd0\u884c\u3002REQUIRES_NEW \u4e5f\u4e0d\u4f1a\u751f\u6548\u2014\u2014\u4e24\u4e2a\u65b9\u6cd5\u4f1a\u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u91cc\u6267\u884c\u3002<\/p>\n

\u89e3\u51b3\u65b9\u5f0f\u6709\u4e09\u79cd：\u4e00\u662f\u62c6\u6210\u4e24\u4e2a Bean，\u7528 @Autowired \u6ce8\u5165\u81ea\u5df1；\u4e8c\u662f\u7528 AopContext.currentProxy() \u83b7\u53d6\u5f53\u524d\u4ee3\u7406\u5bf9\u8c61\u540e\u518d\u8c03；\u4e09\u662f\u5728\u914d\u7f6e\u7c7b\u4e0a\u52a0 @EnableAspectJAutoProxy(exposeProxy = true)，\u7136\u540e ((OrderService) AopContext.currentProxy()).sendNotification(order)\u3002<\/p>\n

\u9762\u8bd5\u5b98\u5982\u679c\u518d\u8ffd\u95ee"AopContext.currentProxy() \u7684\u539f\u7406\u662f\u4ec0\u4e48"\u2014\u2014\u5b83\u662f\u901a\u8fc7 ThreadLocal \u628a\u5f53\u524d\u4ee3\u7406\u5bf9\u8c61\u7ed1\u5b9a\u5230\u7ebf\u7a0b\u4e0a，\u5728\u4ee3\u7406\u65b9\u6cd5\u6267\u884c\u524d\u8bbe\u7f6e\u3001\u6267\u884c\u540e\u6e05\u9664\u3002\u6240\u4ee5\u5b83\u53ea\u80fd\u5728\u4ee3\u7406\u5bf9\u8c61\u7684\u67d0\u4e2a\u65b9\u6cd5\u6b63\u5728\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\u4f7f\u7528，\u8131\u79bb\u4e86\u4ee3\u7406\u65b9\u6cd5\u7684\u8c03\u7528\u94fe\u62ff\u5230\u7684\u662f null\u3002<\/p>\n

\u53e6\u5916\u8865\u5145\u4e24\u4e2a\u6392\u67e5 AOP \u5931\u6548\u7684\u6377\u5f84：\u7b2c\u4e00，\u542f\u52a8\u65f6\u6253 debug \u65e5\u5fd7\u770b AbstractAutoProxyCreator \u7684 advisor \u5339\u914d\u60c5\u51b5\u2014\u2014Spring \u4f1a\u5728\u65e5\u5fd7\u91cc\u544a\u8bc9\u4f60\u67d0\u4e2a Bean \u88ab\u4ee3\u7406\u4e86\u8fd8\u662f\u6ca1\u6709\u5339\u914d\u5230\u5207\u5165\u70b9；\u7b2c\u4e8c，\u6253\u65ad\u70b9\u5728 CglibAopProxy \u7684 getProxy() \u65b9\u6cd5，\u76f4\u63a5\u770b\u8fd4\u56de\u5bf9\u8c61\u7684\u7c7b\u578b\u2014\u2014\u662f\u539f\u59cb\u7c7b\u8fd8\u662f $$EnhancerBySpringCGLIB \u7ed3\u5c3e\u7684\u4ee3\u7406\u7c7b，\u4e00\u76ee\u4e86\u7136\u3002<\/p>\n

\n

\u5520\u70b9\u952e\u76d8\u4e4b\u5916\u7684：<\/p>\n

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