spring4到spring5 AOP执行顺序的转变

前言：之前听尚硅谷周阳阳哥讲课，说是spring5的aop执行顺序和spring4不一样了，并且选用了springboot2.3.10版本测试，结果确实变化了。但是，本人亲自测试以后发现自己使用的springboot2.2.2顺序并没有发生变化，为了弄清楚原因，特意查了下资料和官网，经过代码测试最后得出结果如下：

从spring 5.2.7.RELEASE开始（包括5.2.7），spring aop的执行顺序发生了变化。

测试代码：

public interface CommonService {

    String targetMethod1(String name);

    int targetMethod2(Integer num);

}

@Service
public class CommonServiceImpl implements CommonService{
    @Override
    public String targetMethod1(String name) {
        System.out.println("======CommonServiceImpl targetMethod1======");
        if(name==null || "".equals(name)){
            throw new NullPointerException("name cannot be null");
        }
        return name;
    }

    @Override
    public int targetMethod2(Integer num) {
        System.out.println("======CommonServiceImpl targetMethod2======");
        if(num==null){
            throw new NullPointerException("num cannot be null");
        }
        return num;
    }
}

@Component
@Aspect
public class MyAspect {

    @Pointcut("execution(* org.example.service.CommonService.*(..))")
    public void pointcutCommonService(){}

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

    @After("pointcutCommonService()")
    public void after(){
        System.out.println("=====after=====");
    }

    @Around("pointcutCommonService()")
    public void around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        System.out.println("=====around before=====");
        proceedingJoinPoint.proceed();
        System.out.println("=====around after=====");
    }

    @AfterReturning("pointcutCommonService()")
    public void afterReturning(){
        System.out.println("=====afterReturning=====");
    }

    @AfterThrowing("pointcutCommonService()")
    public void afterThrowing(){
        System.out.println("=====afterThrowing=====");
    }

}

@EnableAspectJAutoProxy
@SpringBootApplication
public class TestSpringAopApplication {
    public static void main(String[] args) {
        SpringApplication.run(TestSpringAopApplication.class,args);
    }
}

@SpringBootTest
@RunWith(SpringRunner.class)
public class SpringAopTest {
    @Resource
    private CommonService commonService;
  
    @Test
    public void testSpringAop526(){
        //springboot 2.2.7.RELEASE ==> spring 5.2.6.RELEASE
        //        正常
        commonService.targetMethod1("张三");
        //=====around before=====
        //=====before=====
        //======CommonServiceImpl targetMethod1======
        //=====around after=====
        //=====after=====
        //=====afterReturning=====

        commonService.targetMethod1(null);
        //=====around before=====
        //=====before=====
        //======CommonServiceImpl targetMethod1======
        //=====after=====
        //=====afterThrowing=====
        //java.lang.NullPointerException: name cannot be null
    }

    @Test
    public void testSpringAop527(){
        //springboot 2.2.8.RELEASE ==> spring 5.2.7.RELEASE
        //        正常
        commonService.targetMethod1("张三");
        //=====around before=====
        //=====before=====
        //======CommonServiceImpl targetMethod1======
        //=====afterReturning=====
        //=====after=====
        //=====around after=====

        commonService.targetMethod1(null);

        //=====around before=====
        //=====before=====
        //======CommonServiceImpl targetMethod1======
        //=====afterThrowing=====
        //=====after=====
        //java.lang.NullPointerException: name cannot be null
    }
}

spring 5.2.7.RELEASE以前，spring aop的执行顺序为（本次选取springboot 2.2.7.RELEASE

对应 spring 5.2.6.RELEASE），具体注解的执行顺序经测试为：

//正常
//=====around before=====
//=====before=====
//======CommonServiceImpl targetMethod1======
//=====around after=====
//=====after=====
//=====afterReturning=====

//异常
//=====around before=====
//=====before=====
//======CommonServiceImpl targetMethod1======
//=====after=====
//=====afterThrowing=====
//java.lang.NullPointerException: name cannot be null

修改pom版本：

        
            org.aspectj
            aspectjweaver
            1.9.5.RELEASE
        
        
            org.springframework.boot
            spring-boot-starter-web
            2.2.7.RELEASE
        
        
            org.springframework.boot
            spring-boot-starter-test
            2.2.7.RELEASE
            test
            true
        

从spring 5.2.7.RELEASE开始（包括5.2.7），spring aop的执行顺序为（本次选取springboot 2.2.8.RELEASE对应 spring 5.2.7.RELEASE），具体注解的执行顺序经测试为：

//正常
//=====around before=====
//=====before=====
//======CommonServiceImpl targetMethod1======
//=====afterReturning=====
//=====after=====
//=====around after=====

//异常
//=====around before=====
//=====before=====
//======CommonServiceImpl targetMethod1======
//=====afterThrowing=====
//=====after=====
//java.lang.NullPointerException: name cannot be null

修改pom版本：

        
            org.aspectj
            aspectjweaver
            1.9.5.RELEASE
        
        
            org.springframework.boot
            spring-boot-starter-web
            2.2.8.RELEASE
        
        
            org.springframework.boot
            spring-boot-starter-test
            2.2.8.RELEASE
            test
            true
        

官网说明：

参考： spring4到spring5 AOP执行顺序的转变_wcherish7的博客-CSDN博客_spring4升级到spring5

https://docs.spring.io/spring-framework/docs/5.2.9.RELEASE/spring-framework-reference/core.html#aop-ataspectj-advice-ordering

 翻译一下意思就是从5.2.7开始，@After将会在任何@AfterReturning或者@AfterThrowing注解后调用。

 补充：从5.2.7开始，@Around注解的around after正常结束时被放在了@After的后面（也就是最后面），异常结束时和之前的版本一样不会执行。