最近工作，有些功能在不同的模块总是会重复的应用，于是想把特定的功能做成一个注解，打成jar包，放到自己的maven私服上面。这里做一下记录（springboot）

一. 自定义注解

1. 建一个注解接口，加上对应的注解信息

      @Target(ElementType.METHOD)
      @Retention(RetentionPolicy.RUNTIME)
      public @interface CrawlerTimed {
      }
   
   

2. 通过拦截器，拦截使用次注解的方法

            public class CrawlerInterceptor extends HandlerInterceptorAdapter {
                private Logger logger = LoggerFactory.getLogger(CrawlerInterceptor.class);
        
        
            /**
             * 调用之前
             * @param request
             * @param response
             * @param handler
             * @return
             * @throws Exception
             */
            @Override
            public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
                HandlerMethod handlerMethod = (HandlerMethod)handler;
                Method method = handlerMethod.getMethod();
        
                //获取此方法上的指定注解
                CrawlerTimed crawlerTimed = method.getAnnotation(CrawlerTimed.class);
        
                //判断当前注解是否存在
                if(crawlerTimed != null){
                    long millis = System.currentTimeMillis();
                    request.setAttribute("startTime",millis);
                    logger.info("进入方法："+method.getName()+" 的时间是："+millis);
                }
        
                return true;
            }
        
            @Override
            public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
                HandlerMethod handlerMethod = (HandlerMethod)handler;
                Method method = handlerMethod.getMethod();
                //获取此方法上的指定注解
                CrawlerTimed crawlerTimed = method.getAnnotation(CrawlerTimed.class);
        
                //如果存在这个注解
                if(crawlerTimed!=null){
                    long endTime = System.currentTimeMillis();
                    Long startTime =(Long) request.getAttribute("startTime");
                    long periodTime = endTime - startTime;
                    logger.info("离开方法："+method.getName()+" 的时间是："+endTime);
                    logger.info("方法："+method.getName()+" 总计耗时："+periodTime +"ms");
                }
            }
            }
            

3 注册此拦截器，不然不会被spring管理

/**
 * 注册自定义的拦截器
 */
@Configuration
public class InterceptorRegister extends WebMvcConfigurerAdapter {

    //创建拦截器bean
    @Bean
    public CrawlerInterceptor crawlerInterceptor(){
        return new CrawlerInterceptor();
    }


    //蒋拦截器bean注册到spring
    @Override
    public void addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(crawlerInterceptor());
    }

}

4.resources/META-INF/spring.factories文件
若没有，则新建此文件

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\cn.iamcrawler.www.crawler_annotation.config.InterceptorRegister

5.打jar包