spring动态代理与静态代理
今天整理复习一下spring的代理实现机制,动态代理与静态代理,一个基于接口,一个基于实现类
spring基本配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><!--静态代理类,需要构造子的实现,对应相应代理接口 --><bean id="staticProxy" ref="userDaoImp"></property><property name="user" ref="user"></property></bean><!--vo对象 --><bean id="user" name="code">public interface UserDAO {boolean insert(User user);void test();}

public class UserDAOIMP implements UserDAO {public boolean insert(User user) {System.out.println("UserDAOIMP的insert方法被调用");return false;}public void test() {System.out.println("UserDAOIMP的test方法被调用");}}

public class StaticProxy implements UserDAO {public UserDAO userDAO;/** * 构造子构造被代理对象 * @param userDAO */public StaticProxy(UserDAO userDAO) {this.userDAO = userDAO;}public boolean insert(User user) {// TODO Auto-generated method stubreturn userDAO.insert(user);}public void test() {// TODO Auto-generated method stubdoBefore();userDAO.test();doAfter();}private void doAfter() {// TODO Auto-generated method stubSystem.out.println("执行方法完毕");}private void doBefore() {// TODO Auto-generated method stub  System.out.println("开始执行方法");}}

public class DynaProxy implements InvocationHandler {private Object obj;/** * 创建代理对象 * @param obj * @return */public Object createObject(Object obj){this.obj=obj;return Proxy.newProxyInstance(obj.getClass().getClassLoader(), obj.getClass().getInterfaces(),this);}/** * 通过反射机制执行被代理对对象方法 * @param proxy * @param method * @param args */public Object invoke(Object proxy, Method method, Object[] args)throws Throwable {doBefore();Object object =method.invoke(obj, args);doAfter();return object;}private void doBefore(){System.out.println("开始执行方法");}private void doAfter(){System.out.println("方法执行完毕");}}