SpringAOP操作 ——AspectJ注解

User

@Component
public class User {
    public void add(){
//        int a=1/0;
        System.out.println("add....");
    }
}

UserProxy

@Component
@Aspect
public class UserProxy {

    @Before(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void before(){
        System.out.println("before...");
    }

    @After(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void after(){
        System.out.println("after...");
    }

    @AfterReturning(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void afterReturning(){
        System.out.println("afterReturning...");
    }

    @AfterThrowing(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void afterThrowing(){
        System.out.println("afterThrowing...");
    }

    @Around(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        System.out.println("环绕之前...");
        proceedingJoinPoint.proceed();
        System.out.println("环绕之后...");
    }
}

spring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: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">

    <context:component-scan base-package="com.atguigu.spring5.aopanno"></context:component-scan>

    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>

</beans>

测试方法 

    @Test
    public void testAopAnno(){
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
        User user = context.getBean("user", User.class);
        user.add();
    }

 运行结果

 

 在add方法中加入int a=1/0;

 

方法错误，afterReturning不执行；after一定执行。 

总结

正常情况下执行顺序：Around start -> Before ->方法执行-> Around end -> After -> AfterReturning
有异常情况下执行顺序：Around start -> Before -> After -> AfterThrowing 

---

优先级：有多个增强类对同一个方法进行增强

@Component
@Aspect
@Order(1)
public class PersonProxy {

    @Pointcut(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void pointdemo(){

    }

    @Before(value = "pointdemo()")
    public void before(){
        System.out.println("before2...");
    }

    @After(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void after(){
        System.out.println("after2...");
    }

    @AfterReturning(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void afterReturning(){
        System.out.println("afterReturning2...");
    }

    @AfterThrowing(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void afterThrowing(){
        System.out.println("afterThrowing2...");
    }

    @Around(value = "execution(* com.atguigu.spring5.aopanno.User.add(..))")
    public void around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        System.out.println("环绕之前2...");
        proceedingJoinPoint.proceed();
        System.out.println("环绕之后2..");
    }
}

 设置UserProxy -@Order(3)

结果 

图示https://blog.youkuaiyun.com/qq_34412985/article/details/107383520?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522164344689516780357222479%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=164344689516780357222479&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~baidu_landing_v2~default-1-107383520.first_rank_v2_pc_rank_v29&utm_term=spring5%E9%80%9A%E7%9F%A5%E6%89%A7%E8%A1%8C%E9%A1%BA%E5%BA%8F&spm=1018.2226.3001.4187