CGLIB

不需要接口也能代理
实现MethodInterceptor接口的intercept方法

public class TestCglibProxy implements MethodInterceptor
{
    private Object target;
   
    public Object newProxyObj(Object target)
    {
        this.target = target;
       
        Enhancer enhancer = new Enhancer();
       
        enhancer.setSuperclass(this.target.getClass());
        enhancer.setCallback(this);
       
        return enhancer.create();
    }
   
    public Object intercept(Object arg0, Method arg1, Object[] arg2, MethodProxy arg3)
        throws Throwable
    {
        // TODO Auto-generated method stub
        System.out.println("before");
        Object result = arg3.invokeSuper(arg0, arg2);
        System.out.println("after");
       
        if(result.toString().equals("4"))
        {
            result = 0;
        }
       
       
        return result;
    }
   
}