动态代理入门

使用InvocationHandler实现动态代理,也就是我们常说的代理模式的一种实现方式之一:(这也是从其他的地方找过来的,很浅显易懂,非原创)

 

 上代码:

 IHello接口:

public interface IHello
{
	public void hello(String name);
}

 

IHelloImpl:

/**
 * @copyright  XXX
 */
package com.yourcompany.struts.proxy;

/**
 * @author meemac
 *
 */
public class HelloImpl implements IHello
{

	/* (non-Javadoc)
	 * @see com.yourcompany.struts.proxy.IHello#hello(java.lang.String)
	 */
	public void hello(String name)
	{
		// TODO Auto-generated method stub
		System.out.println("Hello"+name);
	}

}

 

代理类:

/**
 * @copyright  XXX
 */
package com.yourcompany.struts.proxy;

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

/**
 * @author meemac
 * 
 */
public class HelloProxyImpl implements InvocationHandler
{
	private Object delegate;

	public Object bind(Object delegate)
	{
		this.delegate = delegate;
		return Proxy.newProxyInstance(delegate.getClass().getClassLoader(),
				delegate.getClass().getInterfaces(), this);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.reflect.InvocationHandler#invoke(java.lang.Object,
	 * java.lang.reflect.Method, java.lang.Object[])
	 */
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable
	{
		Object result = null;
		print("call before  :" + method);
		result = method.invoke(delegate, args);
		print("call after :" + method);
		return result;
	}

	private void print(String message)
	{
		System.out.println(message);

	}
}

  

 

 

  测试类:

/**
 * @copyright  XXX
 */
package com.yourcompany.struts.proxy;


/**
 * @author meemac
 * 
 */
public class Demo
{
	public static void main(String[] args)
	{
		HelloProxyImpl helloProxyImpl = new HelloProxyImpl();
		IHello hello = (IHello) helloProxyImpl.bind(new HelloImpl());
		hello.hello("你妹的,我测试下.");

	}
}