jdk 动态代理两种方法实现

方法一: 自己实现invocationHandler

package com.czh.Utils; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; public class proxy_class<T> implements InvocationHandler { private Class<T> target_class; public proxy_class(Class<T> target_class) { this.target_class = target_class; } public Object newInstance () { return Proxy.newProxyInstance(target_class.getClassLoader(),target_class.getInterfaces(),this); } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("这是动态代理实现类!"); method.invoke(target_class.newInstance(),args); return null; } }

方法二 :

package com.czh.Utils; import com.czh.domain.impl.userDaoimpl; import com.czh.domain.userDao; import com.sun.deploy.net.proxy.ProxyHandler; import org.junit.Test; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; public class jdkpoxy { public static void main(String[] args) { userDao UD = new userDaoimpl(); /* userDao proxy =(userDao) new Proxy.getInvocationHandler();*/ /*匿名内部类 实现*/ userDao proxy = (userDao)Proxy.newProxyInstance(jdkpoxy.class.getClassLoader(), UD.getClass().getInterfaces(), new InvocationHandler() { @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("系统执行前:"+System.currentTimeMillis()); return method.invoke(UD, args); } }); proxy.eat("小明!"); proxy.run(); } /*测试 方法一 实现类*/ @Test public void demo2(){ proxy_class<userDaoimpl> userDaoimplproxy_class = new proxy_class<>(userDaoimpl.class); userDao o = (userDao)userDaoimplproxy_class.newInstance(); o.eat("王雪雪"); o.run(); } }