Spring-Aop面向切面

Aop 面向切面

Aop在Spring中的使用流程

添加依赖spring-aspect

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aop</artifactId>
    <version>${spring.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aspects</artifactId>
    <version>${spring.version}</version>
</dependency>

编写切面类

//@Component 将切面类交给spring容器管理
//@Aspect 让spring识别出为切面类，区别与其他非切面类
@Component
@Aspect
public class MyAspect {

//配置值切点，使用execution表达式 方法的名称为切点的名称
//spring.aop下的所有类的所有方法，具体参照execution表达式
    @Pointcut("execution( * spring.aop..*.*(..))")
    public void myPointCut(){
    }

    @Before("spring.aop.aspect.MyAspect.myPointCut()")
    public void beforeFunc(){
        System.out.println("前置通知");
    }

    @After("execution( * spring.aop..*.*(..))")
    public void afterFunc(){
        System.out.println("后置通知");
    }

    @AfterReturning("myPointCut()")
    public void afterReturningFunc(){
        System.out.println("返回通知");
    }

    @AfterThrowing("myPointCut()")
        public void afterThrowingFunc(){
        System.out.println("异常通知");
    }

    @Around("myPointCut()")
    public void aroundFunc(ProceedingJoinPoint proceedingJoinPoint){
        System.out.println("环绕通知");
        Object[] args = proceedingJoinPoint.getArgs();
        for (Object o:args) {
        System.out.print(o+" - ");
        }
        System.out.println("环绕结束");
    }
}

spring开启切面功能

//配置类
@Configuration
@ComponentScan(value = {"spring.aop.dao"})
@Import(value = {MyAspect.class})
@EnableAspectJAutoProxy
public class MySpringAopConfig {

}

// 作用的切点
@Repository
public class AppleDao {

public void aVoid(){
    System.out.println("执行了aVoid()");
}

public void bVoid(String a,String b,String c) throws Exception {
    if("xyz".equals(c)){
        throw new Exception();
    }
    System.out.println("执行了bVoid()");
    }
}

//测试类的测试方法
@Test
public void test() throws Exception {
    AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MySpringAopConfig.class);
    AppleDao appleDao= applicationContext.getBean("appleDao", AppleDao.class);

    appleDao.aVoid();
    System.out.println("++++++++++++++++++++");
    appleDao.bVoid("1", "2", "xyz");
}

切面类中的advice的执行顺序

参考博客：https://blog.csdn.net/rainbow...