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Spring 代理的选择

news 2025/11/8 8:58:53

Spring使用ProxyFactory用来创建代理类，用AopProxyFactory选择具体的代理实现，总共有两种实现，一个是JdkDynamicAopProxy，另一个是ObjenesisCglibProxy。代理的选择具体可以分为以下三种情况。

1.proxyTargetClass为false，目标实现了接口，用jdk实现

       //4.创建代理Target target = new Target();ProxyFactory proxyFactory = new ProxyFactory();proxyFactory.setTarget(target);proxyFactory.addAdvisor(advisor);proxyFactory.setInterfaces(target.getClass().getInterfaces());I1 proxy = (I1) proxyFactory.getProxy();System.out.println(proxy.getClass());proxy.foo();System.out.println("___________");proxy.bar();

2.proxyTargetClass为false，目标没有实现接口，用cglib实现

static class Target2 {public void foo() {System.out.println("Target foo");}public void bar() {System.out.println("Target Bar");}}

       //4.创建代理Target2 target = new Target2();ProxyFactory proxyFactory = new ProxyFactory();proxyFactory.setTarget(target);proxyFactory.addAdvisor(advisor);proxyFactory.setInterfaces(target.getClass().getInterfaces());proxyFactory.setProxyTargetClass(false);Target2 proxy = (Target2) proxyFactory.getProxy();System.out.println(proxy.getClass());proxy.foo();System.out.println("___________");proxy.bar();

3.proxyTargetClass为true，总是使用cglib实现

        //4.创建代理Target target = new Target();ProxyFactory proxyFactory = new ProxyFactory();proxyFactory.setTarget(target);proxyFactory.addAdvisor(advisor);proxyFactory.setInterfaces(target.getClass().getInterfaces());proxyFactory.setProxyTargetClass(true);I1 proxy = (I1) proxyFactory.getProxy();System.out.println(proxy.getClass());proxy.foo();System.out.println("___________");proxy.bar();