【核心核心】8.Spring【AOP】注解方式-优快云博客

本文详细介绍如何使用Spring框架实现面向切面编程(AOP)，包括引入必要的jar包、配置文件、创建业务逻辑类和服务实现类，以及定义切面和通知等关键步骤。

1.引入jar包

sprig框架基础包+JUntil整合包+日志包+AOP包

spring的传统AOP的开发的包

　　spring-aop-4.2.4.RELEASE.jar

　　com.springsource.org.aopalliance-1.0.0.jar

aspectJ的开发包

　　com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar

　　spring-aspects-4.2.4.RELEASE.jar

2.引入配置文件（AOP约束，注解约束）

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd">
    

    
</beans>

3.创建实现类

public interface UserService {
    
    public void save();
    
    public void update();
    
    public void delete();
}

@Service(value="userService")
public class UserServiceImpl implements UserService {

    @Override
    public void save() {
        // TODO Auto-generated method stub
        System.out.println("业务层：保存客户..");
    }

    @Override
    public void update() {
        // TODO Auto-generated method stub
        System.out.println("业务层：更新客户..");
    }

    @Override
    public void delete() {
        // TODO Auto-generated method stub
        System.out.println("业务层：删除客户..");
    }

}

4.将实现类托管于Spring注解方式

5.创建切面类

public class MyAspectAnn {
    public void log(){
        System.out.println("前置通知..");
    }
    
public void arround(ProceedingJoinPoint joinPoint){
        System.out.println("环绕通知1..");
        System.out.println("环绕通知2..");
    }
    public void after(){
        System.out.println("后置通知..");
    }
    
}

6.将切面类托管于Spring

7.定义切面类方法的切入点

8.在配置文件中开启自动代理，并扫描注解

    <!-- 扫描注解 -->
    <context:component-scan base-package="com.spring.demo1"/>
    
    <!-- 开启自动代理 -->
    <aop:aspectj-autoproxy/>

9.编写测试代码

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Demo1 {

    @Resource(name="userService")
    private UserService userService;
    
    @Test
    public void m01(){
        System.out.println("=======================");
        userService.save();
        System.out.println("=======================");
        userService.update();
        System.out.println("=======================");
        userService.delete();
        System.out.println("=======================");
    }
}