java 动态实现接口

package com.yhouse.modules.daos;

public interface IUserDao {
public String getUserName();
public String Say();
}

package com.yhouse.modules.daos;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
public class MethodProxy implements InvocationHandler {
@Override
public Object invoke(Object proxy, Method method, Object[] args)  throws Throwable {
//如果传进来是一个已实现的具体类（本次演示略过此逻辑)
if (Object.class.equals(method.getDeclaringClass())) {
try {
return method.invoke(this, args);
} catch (Throwable t) {
t.printStackTrace();
}
//如果传进来的是一个接口（核心)
} else {
System.out.println(method.getName());
return run(method, args);
}
return null;
}

/**
* 实现接口的核心方法
* @param method
* @param args
* @return
*/
public Object run(Method method,Object[] args){
//TODO
//如远程http调用
//如远程方法调用（rmi)
//....

return "method call success!";
}
}

package com.yhouse.modules.daos;

import java.lang.reflect.Proxy;

public class Test {

public static void main(String[] args) throws ClassNotFoundException {
// TODO Auto-generated method stub

String className = "com.yhouse.modules.daos.IUserDao";
String methodName = "Say";
Class clz = Class.forName(className);

// Object newProxyInstance = Proxy.newProxyInstance(IUserDao.class.getClassLoader(),  new Class[]{IUserDao.class},m);
MethodProxy m=new MethodProxy();
Object newProxyInstance = Proxy.newProxyInstance(clz.getClassLoader(),  new Class[]{clz},m);

IUserDao ud=((IUserDao)newProxyInstance);
String s= ud.getUserName();
System.out.println(s);

String s1=ud.Say();
System.out.println(s1);

}

}