动态代理。就是不用自己写代理类，只要实现接口就行了。

动态代理，这里介绍两种：jdk and cglib

第一个jdk

//一个接口类 public interface Book{ void read(String name); } //一个实现类 public class BookImpl implements Book{ @Override public void read(String name){ System.out.println(name); } } //实现一个一个代理类接口 public class MyInvocationHandler implements InvocationHandler{ private Object target; public MyInvocationHandler(Object target){ this.target =target ; } @Override public Object invoke(Object o,Method method,Object[] args)throws Throwable{ return method.invoke(target,args); } } //测试方法 Public class Main{ public static void main(String args[]){ Book bookImpl = new BookImpl; Object obj = Proxy.newProxyInstance(bookImpl.getClass, )book,getClss().getInterface(),new myInvocation }

cglib

//一个实现类 public class BookImpl { @Override public void read(String name){ System.out.println(name); } } //实现一个一个代理类接口 public class MyInsterceptor implements MethodIntao{ private Object target; public MyInvocationHandler(Object target){ this.target =target ; } @Override public Object intercept(Object o,Method method,Object[] args,MethodProxy myInterce)throws Throwable{ return method.invoke(target,args); } } //测试方法 Public class Main{ public static void main(String args[]){ BookImpl book = new BookImpl(); Enhancer enhancer = new Enhancer(); enhancer.setSuperClass (book.getClass); enhancer.setCallback(new MyInterceptor(book)) BookImpl b = (BookImpl)enhancer.create(); }