spring里使用aop和代理实现目标对象增强示例

本例目标对象类MyDo.class,增强的目标是性能监控。代理类是MyDoAdvice.class,实现了org.aopalliance.intercept.MethodInterceptor（spring aop包下的）。

 

public class MyDo {
    public void doThing() {
        System.out.println("do thing");
    }
}

public class MyDoAdvice implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        long begin = System.currentTimeMillis();
        Object proceed = invocation.proceed();
        long end = System.currentTimeMillis();
        System.out.println((end - begin) + "ms");
        return proceed;
    }
}

public class UseDo {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        MyDo myDo = classPathXmlApplicationContext.getBean(MyDo.class);
        ProxyFactory proxyFactory = new ProxyFactory();
        proxyFactory.setTarget(myDo);
        proxyFactory.addAdvice(new MyDoAdvice());
        MyDo myDoProxy = (MyDo) proxyFactory.getProxy();
        myDoProxy.doThing();
    }
}