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                a. 實現方式:cglib 和 jdk自帶的Proxy實現 b. 策略: 1)如果是有接口聲明的類進行AOP 時,spring調用的是Java.lang.reflection.Proxy 類來做處理 2)如果是沒有接口聲明的類時, spring通過cglib包和內部類來實現 c.配置: &lt;aop:aspectj-autoproxy proxy-target-class="true" /&gt;配置了這句話的話就會強制使用cglib代理。 默認就是false spring動態代理策略 ``` // Spring source public class DefaultAopProxyFactory implements AopProxyFactory, Serializable { @Override public AopProxy createAopProxy(AdvisedSupport config) throws AopConfigException { if (config.isOptimize() || config.isProxyTargetClass() || hasNoUserSuppliedProxyInterfaces(config)) { Class<?> targetClass = config.getTargetClass(); if (targetClass == null) { throw new AopConfigException("TargetSource cannot determine target class: " + "Either an interface or a target is required for proxy creation."); } if (targetClass.isInterface() || Proxy.isProxyClass(targetClass)) { return new JdkDynamicAopProxy(config); } return new ObjenesisCglibAopProxy(config); } else { return new JdkDynamicAopProxy(config); } } /** * Determine whether the supplied {@link AdvisedSupport} has only the * {@link org.springframework.aop.SpringProxy} interface specified * (or no proxy interfaces specified at all). */ private boolean hasNoUserSuppliedProxyInterfaces(AdvisedSupport config) { Class<?>[] ifcs = config.getProxiedInterfaces(); return (ifcs.length == 0 || (ifcs.length == 1 && SpringProxy.class.isAssignableFrom(ifcs[0]))); } } ``` ### FAQ 1. Spring AOP無法代理private方法? jdk是代理接口,私有方法必然不會存在在接口里,所以就不會被攔截到;cglib是子類,private的方法照樣不會出現在子類里,也不能被攔截,private方法在Spring使用純Spring AOP都是無法被攔截的 因為子類無法覆蓋(只能攔截public/protected/包);包級別能被攔截的原因是,如果子類和父類在同一個包中是能覆蓋的;;如果想要實現攔截private方法的代理,可以使用原生AspectJ靜態織入
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