java，Spring中，Proxy模式代码

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.Collection;


public class Protest {


  
    public static void addElement(Collection con) {  
        boolean flag = con.add("我要在这个集合里面添加元素，谁也拦不住，哈哈哈！！！");  //成功加进去
        System.out.println(flag);  
    }  
	public static void main(String[] args) {
		Collection con = (Collection) new ArrayListProxy().createProxy(new ArrayList());  
		addElement(con);  
		
		System.out.println(con.size());//size=1
	}
	
}

class ArrayListProxy {
	
	private Object target;
	
	public Object getTarget() {
		return target;
	}
	
	public Object createProxy(Object target) {
		this.target = target;
		return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), new InvocationHandler(){
			
			@Override
			public Object invoke(Object proxy, Method method, Object[] args)
					throws Throwable {
				System.out.println("小样，我是病毒，今天我就要阻止你了，爱咋咋地");//拦截到invoke方法,打印这一串东西
				Object result = method.invoke(getTarget(), args);
				return result;
			}
			
			
		});
	}
}

转载：http://blog.youkuaiyun.com/xlinsist/article/details/41819493
}