动态代理机制

interface Business { void doSth(); }

实现代理的接口

public class BusinessImpl implements Business { public void doSth() { System.out.println(this); } }

实现代理接口的类

import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; public class SomeInvocationHandler implements InvocationHandler { private Object target; public SomeInvocationHandler(Object target) { this.target = target; } public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println(method); return method.invoke(target, args); } }

代理器

import java.lang.reflect.InvocationHandler; import java.lang.reflect.Proxy; public class BusinessFactory { public static Business getBusiness() { Business target = new BusinessImpl(); InvocationHandler handler = new SomeInvocationHandler(target); return (Business) Proxy.newProxyInstance(Business.class .getClassLoader(), new Class[] { Business.class }, handler); } public static void main(String[] args) { BusinessFactory.getBusiness().doSth(); } }

用代理器获得对象