Spring Aop常见注解与执行顺序详解

plugins {
    id 'org.springframework.boot' version '2.6.3'
    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
    id 'java'
}

group 'io.zhengsh'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
    maven { url 'https://repo.spring.io/milestone' }
    maven { url 'https://repo.spring.io/snapshot' }
}

dependencies {
    # 其实这里也可以不增加 web 配置，为了试验简单，大家请忽略 
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.boot:spring-boot-starter-actuator'
    implementation 'org.springframework.boot:spring-boot-starter-aop'
    
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

tasks.named('test') {
    useJUnitPlatform()
}

public interface CalcService {
    public int div(int x, int y);
}

@Service
public class CalcServiceImpl implements CalcService {
    @Override
    public int div(int x, int y) {
        int result = x / y;
        System.out.println("====> CalcServiceImpl 被调用了，我们的计算结果是：" + result);
        return result;
    }
}

@Aspect
@Component
public class MyAspect {

    @Pointcut("execution(* io.zhengsh.spring.service.impl..*.*(..))")
    public void divPointCut() {

    }

    @Before("divPointCut()")
    public void beforeNotify() {
        System.out.println("----===>> @Before 我是前置通知");
    }

    @After("divPointCut")
    public void afterNotify() {
        System.out.println("----===>> @After  我是后置通知");
    }

    @AfterReturning("divPointCut")
    public void afterReturningNotify() {
        System.out.println("----===>> @AfterReturning 我是前置通知");
    }

    @AfterThrowing("divPointCut")
    public void afterThrowingNotify() {
        System.out.println("----===>> @AfterThrowing 我是异常通知");
    }

    @Around("divPointCut")
    public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        Object retVal;
        System.out.println("----===>> @Around 环绕通知之前 AAA");
        retVal = proceedingJoinPoint.proceed();
        System.out.println("----===>> @Around 环绕通知之后 BBB");
        return retVal;
    }
}

@Service
public class AService {
    
    public void a() {
        System.out.println("...... a");
        b();
    }
    
    public void b() {
        System.out.println("...... b");
    }

}