标签：print 产生 tcl lan new interface 输出 span eth
Jdk 动态代理通过反射包提供的方式，必须要借助一个借口才能产生反射对象
1.定义接口：
public interface HelloWorld { public void sayHelloWorld(); public void sayBye(); }
2.实现接口。
public class HelloWorldImpl implements HelloWorld { @Override public void sayHelloWorld() { System.out.println("hello world....."); } @Override public void sayBye() { System.out.println("good bye....."); } }
3. JDK 动态代理要实现逻辑类，必须去实现java.lang.reflect.InvocationHandler接口， 里面定义了invoke方法。
public class JdkProxy implements InvocationHandler { //真实对象 private Object target; //返回代理对象 public Object bind(Object target) { this.target=target; return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), this); } //代理方法逻辑 @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("entrance proxy method...."); System.out.println("before call real obj method....."); Object obj = method.invoke(target, args);//相当调用sayHello/bye System.out.println("after real obj....."); return obj; } }
4.测试类：
public class JdkProxyTest { public static void main(String[] args) { JdkProxy jdk = new JdkProxy(); HelloWorld hellow = (HelloWorld) jdk.bind(new HelloWorldImpl()); hellow.sayHelloWorld(); hellow.sayBye(); } } 输出： entrance proxy method.... before call real obj method..... hello world..... after real obj..... entrance proxy method.... before call real obj method..... good bye..... after real obj.....
标签：print 产生 tcl lan new interface 输出 span eth
原文地址：https://www.cnblogs.com/daxiong225/p/9900393.html
