java 動態實現介面

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package com.yhouse.modules.daos;public interface IUserDao {    public String getUserName();    public String Say();}

2.

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 {                //如果傳進來是一個已實現的具體類（本次示範略過此邏輯)        if (Object.class.equals(method.getDeclaringClass())) {              try {                  return method.invoke(this, args);              } catch (Throwable t) {                  t.printStackTrace();              }          //如果傳進來的是一個介面（核心)        } else {              System.out.println(method.getName());            return run(method, args);          }          return null;    }        /**     * 實現介面的核心方法      * @param method     * @param args     * @return     */    public Object run(Method method,Object[] args){          //TODO                 //如遠程http調用        //如遠程方法調用（rmi)        //....           return "method call success!";    }  }

3.

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);    }}

 

java 動態實現介面