注解方式实现Spring的aop

来源：互联网发布：淘宝外卖粮票怎么用编辑：程序博客网时间：2024/05/18 00:36

一、UserService接口

<span style="font-size:18px;">package com.seven.spring.o_aop_annotation;import java.util.List;public interface UserService {//为了后置通知返回一个结果   List<Object> queryUsers();      void saveUser();      void deleteUser();}</span>

二、UserServiceImpl实现类

<span style="font-size:18px;">package com.seven.spring.o_aop_annotation;import java.util.ArrayList;import java.util.List;public class UserServiceImpl implements UserService{public List<Object> queryUsers() {System.out.println("查询一个User");return new ArrayList<Object>();}public void saveUser() {System.out.println("保存一个User");}public void deleteUser() {int i= 1/0;System.out.println("删除一个User");}}</span>

三、通知对象LogAdvice

<span style="font-size:18px;">package com.seven.spring.o_aop_annotation;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.AfterReturning;import org.aspectj.lang.annotation.AfterThrowing;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.aspectj.lang.annotation.Pointcut;/** * 通知对象 * @author Administrator * */@Aspect//定义一个切面public class LogAdvice{@Pointcut("execution(* *(..))")private void MyPointCut(){}//前置通知@Before("MyPointCut()")    public void before(){    System.out.println("==before==");    }     //最终通知@After("MyPointCut()")    public void after(){    System.out.println("==after==");    }    //后置通知//returning="returnValue"接受原方法执行后的返回值@AfterReturning(pointcut="MyPointCut()",returning="returnValue")    public void afterReturning(Object returnValue){System.out.println(returnValue);    System.out.println("==afterReturning==");    }   //异常通知@AfterThrowing(pointcut="MyPointCut()",throwing="ex")    public void afterThrows(Exception ex){System.out.println(ex);    System.out.println("==afterThrows==");    }        //环绕通知//一定要在环绕通知中，执行完本方法后，要有返回结果    @Around("MyPointCut()")    public Object around(ProceedingJoinPoint joinPoint){        try {    System.out.println("环绕通知（前）");Object object=joinPoint.proceed();//执行原方法System.out.println("环绕通知（后）");return object;} catch (Throwable e) {            throw new RuntimeException(e);}    }}</span>

四、applicationContext.xml

<span style="font-size:18px;"><?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:context="http://www.springframework.org/schema/context"   xmlns:tx="http://www.springframework.org/schema/tx"   xmlns:aop="http://www.springframework.org/schema/aop"   xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans-2.5.xsd   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd   http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd   http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"><!-- 配置UserService对象 --><bean id="userService" class="com.seven.spring.o_aop_annotation.UserServiceImpl"></bean><!-- 配置一个通知对象 -->    <bean id="logAdvice" class="com.seven.spring.o_aop_annotation.LogAdvice"></bean> <!-- 使用注解的方式配置切面，必须要有这个配置-->    <aop:aspectj-autoproxy></aop:aspectj-autoproxy></beans></span>

五、测试类MainTest

<span style="font-size:18px;">package com.seven.spring.o_aop_annotation;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.seven.oa.service.crm.RoleService;/** * 使用编程方式实现aop * @author Administrator */public class MainTest {@Testpublic void testUserService(){ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml", getClass());//这里获取的是代理对象UserService userService = (UserService) ac.getBean("userService");System.out.println(userService.getClass());//=========================//使用的是代理对象userService.saveUser();System.out.println("--------------");userService.queryUsers();System.out.println("--------------");userService.deleteUser();System.out.println("--------------");}}</span>

0 0