Home >Java >javaTutorial >Analysis of JDK dynamic proxy examples in java
1. Description
Java provides a dynamic proxy class Proxy. Proxy is not a class of what we call proxy objects, but provides a static method for creating proxy objects. Method (newProxyInstance) to obtain the proxy object.
2. Example
public class HelloWorld { public static void main(String[] args) { // 获取代理对象 ProxyFactory factory = new ProxyFactory(); SellTickets proxyObject = factory.getProxyObject(); proxyObject.sell(); } } // 卖票接口 interface SellTickets { void sell(); } // 火车站,火车站具有卖票功能,所以需要实现SellTickets接口 class TrainStation implements SellTickets { @Override public void sell() { System.out.println("火车站卖票"); } } // 代理工厂,用来创建代理对象 class ProxyFactory { private TrainStation station = new TrainStation(); public SellTickets getProxyObject() { // 使用Proxy获取代理对象 /** * newProxyInstance() 方法参数说明: * ClassLoader loader: 类加载器,用于加载代理类,使用真实对象的类加载器即可 * Class<?>[] interfaces:真实对象所实现的接口,代理模式真实对象和代理对象实现相同的接口 * InvocationHandler h:代理对象的调用处理程序 */ SellTickets sellTickets = (SellTickets) Proxy.newProxyInstance( station.getClass().getClassLoader(), new InvocationHandler() { /** * InvocationHandle中invoke方法参数说明: * proxy:代理对象 * method:对应于在代理对象上调用的方法的Method实例 * args:代理对象调用接口方法是传递的实际参数 */ public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("代理点收取一些服务费用(JDK动态代理方法)"); // 执行真实对象 Object result = method.invoke(station, args); return result; } }); return sellTickets; } }
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