java.lang.reflect 动态代理

public interface IReport {

	String published();
}

 

public class Report implements IReport{

	public String published() {
           System.out.println("hello~~~");
           return "return Hello";
	} 

}

 

 

 

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

public class ReportProxy implements InvocationHandler{
    Object sub;
	
	public ReportProxy() {
		super();
	}
	
	public ReportProxy(Object obj) {
		super();
		this.sub = obj;
	}

	public Object invoke(Object proxy, Method method, Object[] args)
		   throws Throwable {
		   System.out.println("11111111111111");
		  Object obj =  method.invoke(sub, args);
		   System.out.println("22222222222222");
		
		return obj;
	}

}

 

 

 

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

public class Client {
public static void main(String[] args) {
	//建立真正的实现实例
	IReport rep = new Report();
	//创建动态代理类
	ReportProxy dynamicProxy = new ReportProxy(rep);
	//获取CLASS
	Class ds = rep.getClass();
	//创建代理实例
	Object obj = Proxy.newProxyInstance(ds.getClassLoader(), ds.getInterfaces(), dynamicProxy);
	//强制转换
	IReport repProxy = (IReport)obj;
	//通过代理执行方法
	Object retObj = repProxy.published();
	//获取并打印方法执行结果
	System.out.println(retObj);

}
}