拦截器

1. 创建拦截器

   /**
    * @author wsyjlly
    * @create 2019.06.13 - 16:52
    **/
   public class FileUploadInterceptor implements HandlerInterceptor {
       private Logger logger = LoggerFactory.getLogger(getClass());
       @Override
       public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
           logger.debug("FileUploadInterceptor...preHandle");
           return true;
       }
   
       @Override
       public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
           logger.debug("FileUploadInterceptor...postHandle");
       }
   
       @Override
       public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
           logger.debug("FileUploadInterceptor...afterCompletion");
       }
   }
   

2. 注册拦截器

   1. 注册方式一：一般注册方式

      /**
       * @author wsyjlly
       * @create 2019.06.12 - 16:17
       **/
      @Configuration
      public class WebMvcConfig implements WebMvcConfigurer {
          /*
          * 配置拦截器
          * */
          @Override
          public void addInterceptors(InterceptorRegistry registry) {
                registry.addInterceptor(new FileUploadInterceptor()).
                addPathPatterns("/upload").order(1);
          }
      }

   2. 注册方式二：当拦截器中需要注入变量时须提前加载该拦截器

      /**
       * @author wsyjlly
       * @create 2019.06.12 - 16:17
       **/
      @Configuration
      public class WebMvcConfig implements WebMvcConfigurer {
          /*
          * 配置拦截器
          * */
          @Override
          public void addInterceptors(InterceptorRegistry registry) {
                registry.addInterceptor(getFileUploadInterceptor()).
                addPathPatterns("/upload").order(1);
          }
          
          @Bean
          public FileUploadInterceptor getFileUploadInterceptor(){
              return new FileUploadInterceptor();
          }
      }