使用注解装配Aop学习笔记

1. 编写注解类

   @Target(ElementType.METHOD)
   @Retention(RetentionPolicy.RUNTIME)
   public @interface MetricTime {
         
         
      String value();
   }
   

2. 编写Aspect类

   @Aspect
   @Component
   // 不需要获取注解类（注意@annotation参数为注解类全名称）
   public class MetricAspect {
         
         
       @Around("@annotation(com.yicj.study.mq.aspect.MetricTime)")
       public Object metric(ProceedingJoinPoint joinPointm)throws Throwable{
         
         
           //String name = metricTime.value();
           long start = System.currentTimeMillis();
           try {
         
         
               return joinPointm.proceed() ;
           } finally {
         
         
               long end = System.currentTimeMillis();
               // 写入日志或发送至JMX:
               System.out.println("===> [Metrics] : " + (end -start) +"s");
           }
       } 
   }
   @Aspect
   @Component
   // 获取注解实例（注意@annotation参数方法中的MetricTime2的参数名称）
   public class MetricAspect2 {
         
         
      @Around("@annotation(metricTime)")
      public Object metric2(ProceedingJoinPoint joinPointm, MetricTime metricTime)throws Throwable{
         
         
          String name = metricTime.value();
          long start = System.currentTimeMillis();
          try {
         
         
              return joinPointm.proceed() ;
          } finally {
         
         
              long end = System.currentTimeMillis();
              // 写入日志或发送至JMX:
              System.out.println("===> [Metrics] " + name + " : " + (end -start) +"s");
          }
      }
   }
   

3. 编写业务类并使用@MetricTime注解

   @Service
   public class UserService {
         
         
       @MetricTime("register")
       public String register(String name, String password, String email){
         
         
           try {
         
         
               Thread.sleep(345);
           } catch (InterruptedException e) {
         
         
               e.printStackTrace();
           }
           return "success" ;
       }   
   }
   

4. 参考：https://www.liaoxuefeng.com/wiki/1252599548343744/1310052317134882