about proxy

一、实现InvacatinHandler

Exmaple:

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


public class MyInvocationhandler implements InvocationHandler{

	private Object target;
	
	@Override
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		// TODO 调用一个类方法在其开始和结束时分别先执行method1和method2
		Dogutil du=new Dogutil();  
		//要开始时插入的method1方法
		du.method1();
		//Object result=invoke(target, method, args);
		Object result=method.invoke(target,args);  
		//要结束时插入的method1方法
		du.method2();
		return result;
	}

	public Object getTarget() {
		return target;
	}

	public void setTarget(Object target) {
		this.target = target;
	}

}

　　二、实现proxyfactory

Example:

import java.lang.reflect.Proxy;


public class proxyfactory {
public static Object getproxy(Object traget){
    MyInvocationhandler handler=new MyInvocationhandler();
    handler.setTarget(traget);

    return Proxy.newProxyInstance(traget.getClass().getClassLoader(),
            traget.getClass().getInterfaces(), handler);
}
}

　　三、编写测试类。

Example:

public class test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO 使用代理调用gundog类方法
            Dog traget=new gundog();
            Dog dog =(Dog)proxyfactory.getproxy(traget);
            dog.info();
            dog.run();
    }

}