靜態代理 & 動態代理

2019-11-08 00:01:26

字體：大中小

來源：轉載

供稿：網友

最近在學習java代理模式，下面是學習心得

1，對于靜態代理：

interface PRoxyInterFace { void sayHello(); } static class TargetObject implements ProxyInterFace { @Override public void sayHello() { System.out.println("hello world"); } } static class ProxyObject implements ProxyInterFace { private ProxyInterFace object; public ProxyObject(ProxyInterFace obj) { this.object = obj; } @Override public void sayHello() { object.sayHello(); } } public static void main(String[] args) { //代理的目標對象 ProxyInterFace proxyInterFace = new TargetObject(); //代理器 ProxyObject proxyObject = new ProxyObject(proxyInterFace); //調用目標對象的方法, 執行代碼任務 proxyObject.sayHello(); }

2，對于動態代理：

interface ProxyInterFace { void sayHello(); } static class TargetObject implements ProxyInterFace { @Override public void sayHello() { System.out.println("hello world"); } } static class ProxyObject implements InvocationHandler { private Object object; public ProxyObject(Object obj) { this.object = obj; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { //do something return method.invoke(object, args); //do something } } public static void main(String[] args) { //代理的目標對象 ProxyInterFace proxyInterFace = new TargetObject(); //代理器 ProxyObject proxyObject = new ProxyObject(proxyInterFace); //轉換成InvocationHandler InvocationHandler handler = proxyObject; //執行代碼任務 Object proxy = Proxy.newProxyInstance(proxyInterFace.getClass().getClassLoader(), proxyInterFace.getClass().getInterfaces(), handler); //轉換成目標對象，調用目標對象的方法 ((ProxyInterFace) proxy).sayHello(); }

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