注解aop举例

加入maven依赖

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>

环境搭建

1. 随便定义个服务

public class UserService {
    public int getUserAge(int i,int j){
        System.out.println("UserService...getUserAge...");
        return i/j; 
    }
}

2. 定义切面

@Aspect
public class LogAspects {
    
    //抽取公共的切入点表达式
    @Pointcut("execution(* com.simon.springdemo.aop.UserService.*(..))")
    public void pointCut(){};
    
    @Before("pointCut()")
    public void logStart(JoinPoint joinPoint){
        Object[] args = joinPoint.getArgs();
        System.out.println(""+joinPoint.getSignature().getName()+"--@Before:参数列表是：{"+Arrays.asList(args)+"}");
    }
    
    @After("pointCut()")
    public void logEnd(JoinPoint joinPoint){
        System.out.println(""+joinPoint.getSignature().getName()+"--@After");
    }

    /**
     * JoinPoint一定要出现在参数表的第一位
     * @param joinPoint
     * @param result
     */
    @AfterReturning(value="pointCut()",returning="result")
    public void logReturn(JoinPoint joinPoint,Object result){
        System.out.println(""+joinPoint.getSignature().getName()+"--@AfterReturning:运行结果：{"+result+"}");
    }
    
    @AfterThrowing(value="pointCut()",throwing="exception")
    public void logException(JoinPoint joinPoint,Exception exception){
        System.out.println(""+joinPoint.getSignature().getName()+"--@AfterThrowin异常信息：{"+exception+"}");
    }
}

3. 定义配置

@EnableAspectJAutoProxy
@Configuration
public class AOPConfig{
     
    //业务逻辑类加入容器中
    @Bean
    public UserService userService(){
        return new UserService();
    }

    //切面类加入到容器中
    @Bean
    public LogAspects logAspects(){
        return new LogAspects();
    }
}

4. 测试

public class Test_AOP {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(AOPConfig.class);
        UserService mathCalculator = applicationContext.getBean(UserService.class);
        mathCalculator.getUserAge(1, 0);
        applicationContext.close();
    }
}

5. 测试结果

正常执行完毕
  Before->目标方法->After->AfterReturning
异常执行
  Before->目标方法->After->AfterThrowin异常信息