Spring-基于注解的AOP快速入门案例

迈不过友情╰ 2022-12-01 15:47 154阅读 0赞

**问题引出**  
Spring 的AOP纯注解配置是官方主推的模式，它不仅简化了配置流程，而且用起来也特别的方便，下面我们在xml配置的基础上修改一下纯注解配置方式

--------------------

**实现步骤**  
第一步：maven坐标需要增加AOP的实现包：`aspectjweaver`

<dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>
        
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.9</version>
        </dependency>
        
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>
        
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

第二步：目标类和切面类的准备

public class UserService{
        void save();
    }

@Service("userService")
    public class UserServiceImpl {
        public void save(){
            System.out.println("PersonList is running");
        }
    }

切面类

import org.aspectj.lang.ProceedingJoinPoint;
    import org.aspectj.lang.annotation.Around;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    import org.springframework.stereotype.Component;
    
    //声明当前类是切面类：把切入点和通知，在这个类里进行织入，当前类就成为了一个切面类
    @Aspect
    @Component("myAdvice1")
    public class MyAdvice1 {
        @Around("execution(* com.gg.service..*.*(..))")
        public Object around(ProceedingJoinPoint pjp) throws Throwable {
            System.out.println("环绕前置通知");
            Object proceed = pjp.proceed(pjp.getArgs());
            System.out.println("环绕后置通知");
            return proceed;
        }
        @Before("execution(* com.gg.service..*.*(..))")
        public void before(){
            System.out.println("前置通知");
        }
    }

第三步：纯注解开发，可以使用配置类代替`applicationContext.xml`，配置类如下：

@Configuration //标记当前类是：配置类
    @ComponentScan(basePackage="com.gg.service") //配置注解扫描
    @EnableAspectJAutoProxy //开启AOP自动代理
    public class AnnotationAop {
    }

第四步：测试

@Test
    public void AopTest() {
     AnnotationConfigApplicationContext appConfig1 = new AnnotationConfigApplicationContext(AnnotationAop.class);
            UserService userService = appConfig1.getBean(userService.class);
            userService.savel();
    }

测试结果  
![在这里插入图片描述][20200828011354582.png_pic_center]

[20200828011354582.png_pic_center]: /images/20221123/f5365e3436c14e8cb4c6f055d97efe40.png