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 */@Configurationpublic 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

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

5.打jar包