\struts2\src\com\interceptor

package com.interceptor;

public class Interceptor
{
	public void before()
	{
		System.out.println("before");
	}
	
	public void after()
	{
		System.out.println("after");
	}
}

package com.interceptor;

public class Target implements TargetInterface
{
	public void doSomething()
	{
		System.out.println("do something");
	}
}

package com.interceptor;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class MyHandler implements InvocationHandler
{
	private Object object;

	private Interceptor interceptor = new Interceptor();

	public void setObject(Object object)
	{
		this.object = object;
	}

	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable
	{
		Object result = null;

		interceptor.before();

		result = method.invoke(object, args);

		interceptor.after();

		return result;

	}

}

package com.interceptor;

import java.lang.reflect.Proxy;

public class MyProxy
{
	public Object getProxy(Object object)
	{
		MyHandler myHandler = new MyHandler();

		myHandler.setObject(object);

		return Proxy.newProxyInstance(Target.class.getClassLoader(), object
				.getClass().getInterfaces(), myHandler);
	}
}

package com.interceptor;

public class Client
{
	public static void main(String[] args)
	{
		TargetInterface target = new Target();
		
		MyProxy myProxy = new MyProxy();
		
		TargetInterface proxy = (TargetInterface)myProxy.getProxy(target);
		
		proxy.doSomething();
	}

}