動態代理與靜態代理

靜態代理例程如下：

package com.atscnu; interface ClothFactory{void produce(); } class NikeClothFactory implements ClothFactory{@Overridepublic void produce() {System.out.println("Nike 生成鞋子");} } class StaticProxy implements ClothFactory{ClothFactory clothFactory;public StaticProxy(ClothFactory clothFactory){this.clothFactory = clothFactory;}@Overridepublic void produce() {System.out.println("代理類開始進行代理！！");clothFactory.produce();} } public class TestStaticProxy {public static void main(String[] args) {NikeClothFactory nikeClothFactory = new NikeClothFactory();StaticProxy staticProxy = new StaticProxy(nikeClothFactory);staticProxy.produce();} }

動態代理例程：

package com.atscnu;import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy;interface Subject{void info(); } class RealSubject implements Subject{ //被代理類實現接口@Overridepublic void info() {System.out.println("我是被代理類，我要被執行！！！");} } //代理類實現InvocationHandler接口 class MyProxyHandle implements InvocationHandler{Object object; // 1. 對被代理類實例化；2. 返回一個代理類對象public Object realProxy(Object object){this.object = object;return Proxy.newProxyInstance(object.getClass().getClassLoader(), object.getClass().getInterfaces(),this);} // 當通過代理類對重寫的方法進行調用的時候，都會調用下面這個方法@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {Object invoke = method.invoke(object, args);return invoke;} } public class TestDynamicProxy {public static void main(String[] args) { // 創建一個被代理類對象RealSubject realSubject = new RealSubject(); // 創建一個實現InnovationHandler接口的對象MyProxyHandle myProxyHandle = new MyProxyHandle(); // 調用realProxy方法，返回一個同樣實現了Subject接口的對象，即代理類的對象，此時o為代理類對象Object o = myProxyHandle.realProxy(realSubject);Subject myProxyHandle1 = (Subject)o; // 轉到對invoke方法的調用myProxyHandle1.info();// 例子2NikeClothFactory nikeClothFactory = new NikeClothFactory();MyProxyHandle myProxyHandle2 = new MyProxyHandle();ClothFactory clothFactory = (ClothFactory)myProxyHandle2.realProxy(nikeClothFactory);clothFactory.produce();} }

總結

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