springboot注解方式实现aop及常规方式

本文介绍springboot实现aop的两种方式
首先需要引入对应依赖：

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.9.1</version>
        </dependency>
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在启动类上面加上注解

@EnableAspectJAutoProxy
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其实不加这个注解也可以，aop照样会生效，我们查看spring-boot-autoconfigure的依赖，查看spring.factories文件会发现以下配置

然后查看AopAutoConfiguration类会发现，当yml没有对应配置时，默认为true
下面展示常规方式实现aop的示例：

/**
 * @Description
 * @Author maruko
 * @Date 2022/11/22 17:04
 * @Version 1.0
 */
@Aspect
@Component
public class AspectTest {

    @Pointcut("execution(* com.zjf.demo.controller.UserController.*(..))||execution(* com.zjf.demo.controller.KafkaController.*(..))")
    public void pointExpression() {

    }

    @Before("pointExpression()")
    public void before(JoinPoint joinPoint) {
//        System.err.println(joinPoint.toString());
//        Object[] args = joinPoint.getArgs();
//        for (Object arg : args) {
//            System.err.println(arg);
//        }

//        System.err.println(joinPoint.getSignature().toLongString());
//        System.err.println(joinPoint.getSignature().toShortString());
//        System.err.println(joinPoint.getSignature().getName());
//        System.err.println(joinPoint.getSignature().toString());
//        System.err.println(joinPoint.getKind());
//        System.err.println(joinPoint.getTarget().toString());
//        System.err.println(joinPoint.getThis().toString());
//        System.err.println(joinPoint.getStaticPart());
//        System.err.println(joinPoint.getSourceLocation());
//        System.err.println(joinPoint.toLongString());
//        System.err.println(joinPoint.toShortString());
        System.err.println("前置通知，方法名为：" + joinPoint.getSignature().getName() + " 参数为：" + Arrays.asList(joinPoint.getArgs()));
    }

//    @After("execution(* com.zjf.demo.controller.UserController.*(..))")
    public void after(JoinPoint joinPoint) {
        System.err.println("后置通知，方法名为：" + joinPoint.getSignature().getName() + " 参数为：" + Arrays.asList(joinPoint.getArgs()));

    }

//    @AfterReturning(pointcut = "execution(* com.zjf.demo.controller.UserController.*(..))", returning = "result")
    public void afterReturning(JoinPoint joinPoint, Object result) {
        System.err.println("返回通知，方法名为：" + joinPoint.getSignature().getName() + " 参数为：" + Arrays.asList(joinPoint.getArgs()) + " 返回结果为：" + result);
    }

//    @AfterThrowing(value = "execution(* com.zjf.demo.controller.UserController.*(..))", throwing = "exception")
    public void afterThrowing(JoinPoint joinPoint, Exception exception) {
        System.err.println("异常通知，方法名为：" + joinPoint.getSignature().getName() + " 参数为：" + Arrays.asList(joinPoint.getArgs()) + " 异常为：" + exception);
    }

//    @Around("execution(* com.zjf.demo.controller.UserController.*(..))")
    public Object aroundMethod(ProceedingJoinPoint joinPoint) {

        String methodName = joinPoint.getSignature().getName();

        List<Object> args = Arrays.asList(joinPoint.getArgs());

        Object result = null;
        try {
            //前置通知
            System.err.println("前置通知，方法名为：" + joinPoint.getSignature().getName() + " 参数为：" + Arrays.asList(joinPoint.getArgs()));

            result = joinPoint.proceed();

            //返回通知
            System.err.println("返回通知，方法名为：" + joinPoint.getSignature().getName() + " 参数为：" + Arrays.asList(joinPoint.getArgs()) + " 返回结果为：" + result);
        } catch (Throwable e) {
            // 异常通知
            System.err.println("异常通知，方法名为：" + joinPoint.getSignature().getName() + " 参数为：" + Arrays.asList(joinPoint.getArgs()) + " 异常为：" + e);
            throw new RuntimeException(e);
        }

        //后置通知
        System.err.println("后置通知，方法名为：" + joinPoint.getSignature().getName() + " 参数为：" + Arrays.asList(joinPoint.getArgs()));

        return result;
    }


}
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注解方式实现如下：
首先定义注解：

@Target(ElementType.METHOD)   //定义注解的使用范围为方法
@Retention(RetentionPolicy.RUNTIME )
public @interface AopAnnotation {
}
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示例如下：
/**

• @Description

• @Author maruko

• @Date 2022/11/23 9:33

• @Version 1.0
  */
  @Aspect
  @Component
  @Order(1)
  public class AspectAnnotationTest {

  @Pointcut(“@annotation(com.zjf.demo.annotation.AopAnnotation)”)
  public void pointExpression() {

  }

  @Before(“pointExpression()”)
  public void before(JoinPoint joinPoint) {
  // System.err.println(joinPoint.toString());
  // Object[] args = joinPoint.getArgs();
  // for (Object arg : args) {
  // System.err.println(arg);
  // }

// System.err.println(joinPoint.getSignature().toLongString());
// System.err.println(joinPoint.getSignature().toShortString());
// System.err.println(joinPoint.getSignature().getName());
// System.err.println(joinPoint.getSignature().toString());
// System.err.println(joinPoint.getKind());
// System.err.println(joinPoint.getTarget().toString());
// System.err.println(joinPoint.getThis().toString());
// System.err.println(joinPoint.getStaticPart());
// System.err.println(joinPoint.getSourceLocation());
// System.err.println(joinPoint.toLongString());
// System.err.println(joinPoint.toShortString());
System.err.println(“注解方式实现，前置通知，方法名为：” + joinPoint.getSignature().getName() + " 参数为：" + Arrays.asList(joinPoint.getArgs()));
}
}