jdk动态代理demo实践

续上篇博客，本文通过demo介绍jdk动态代理

IndexDao.java

package com.jd.project.dao;

import com.jd.project.domain.CustWorker;
import org.apache.ibatis.annotations.Param;

import java.util.List;
import java.util.Map;

public interface IndexDao {
    public void selectByKey();
}

IndexDaoImpl.java

package com.jd.project.dao;

import java.lang.reflect.Proxy;

public class IndexDaoImpl implements IndexDao{
    @Override
    public void selectByKey(){
        System.out.println("test");
    }
    public static void main(String[] args) {
        IndexDao indexDao = new IndexDaoImpl();
        IndexDao indexDao1 = (IndexDao) new MyInvocationHandler(new IndexDaoImpl()).getProxy();
        indexDao1.selectByKey();
    }
}

MyInvocationHandler.java

package com.jd.project.dao;

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

public class MyInvocationHandler implements InvocationHandler {
    private Object target;

    public MyInvocationHandler(Object target) {
        this.target = target;
    }

    public <T> T getProxy(){
        return (T)Proxy.newProxyInstance(IndexDaoImpl.class.getClassLoader(),new Class[]{IndexDao.class},this);
    }
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("proxy start");
        return method.invoke(target,args);
    }
}

ProxyClass.java

package com.jd.project.dao;



import java.lang.reflect.Proxy;

public class ProxyClass{
    public void invoke(){

    }
}