Spring中AOP的使用

Spring中全自动AOP使用

作用：多用于事务配置和日志记录

1、导包：com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar

2、全自动AOP配置

<?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"
       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">

    <!-- bean definitions here -->
    <!--开启注解-->
    <context:annotation-config/>
    <!--注解的位置-->
    <context:component-scan base-package="com.hwt"></context:component-scan>

    <aop:config proxy-target-class="true">
        <!--切入点--><!--注意：第一个*后与包名之间有空格，缺少会报错-->
        <aop:pointcut id="myPointcut" expression="execution(* com.hwt.service.*.*(..))"/>
        <!--通知-->
        <aop:advisor advice-ref="myAspect" pointcut-ref="myPointcut"/>
    </aop:config>
</beans>

3、原业务类：

package com.hwt.service;

import org.springframework.stereotype.Service;

@Service("studentService")
public class StudentService {
    public void delete(){
        System.out.println("删除学生！");
    }
    public void add(){
        System.out.println("添加学生！");
    }
    public void update(){
        System.out.println("修改信息！");
    }
}

4、切面类：（增强类）

PS：跳坑，此处注意，导错包会出错

package com.hwt.service;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.stereotype.Component;

/**
 * 切面类：增强代码与切入点的结合
 */

@Component("myAspect")
public class MyAspect implements MethodInterceptor {

    public void before(){
        System.out.println("开启事务。。。");
    }
    public void after(){
        System.out.println("关闭事务。。。");
    }

    @Override
    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
        before();
        //放行方法
        //Object invoke = method.invoke(studentService);
        Object invoke = methodInvocation.proceed();
        System.out.println("拦截。。。。");
        after();
        return invoke;
    }
}

5、测试类：

package com.hwt.test;

import com.hwt.service.StudentService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test04 {
    @Test
    public void test01(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans04.xml");

        StudentService studentService = (StudentService) context.getBean("studentService");

        studentService.add();
        studentService.delete();
        studentService.update();
    }
}

测试结果：