SpringBoot集成拦截器[通俗易懂]

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集成拦截器

• 登录验证为例

• 添加拦截器

  public class LoginInterceptor implements HandlerInterceptor { 
       
  
      private Logger log = LoggerFactory.getLogger(getClass());
  
      //Controller逻辑执行之前
      @Override
      public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { 
       
          log.info("preHandle....");
          Object user = WebUtils.getHttpSession().getAttribute("user");
          log.info("user:{}",user);
          String uri = request.getRequestURI();
          log.info("uri："+ uri);
          if (user == null) { 
       
              response.sendRedirect("/");
              return false;
          } else { 
       
              return true;
          }
      }
  
      //Controller逻辑执行完毕但是视图解析器还未进行解析之前
      @Override
      public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { 
       
          log.info("postHandle....");
      }
  
      //Controller逻辑和视图解析器执行完毕
      @Override
      public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { 
       
          log.info("afterCompletion....");
      }
  }
  

• 注册，配置拦截路径和排除登录需访问路径

  @Configuration
  public class WebMvcConfig implements WebMvcConfigurer { 
       
  
      @Override
      public void addInterceptors(InterceptorRegistry registry) { 
       
          registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**")
                  .excludePathPatterns("/", "/login",  "/user/login","/user/login",
                          "/images/**", "/user/getCode", "/js/**", "/page/**",  "/layui/**",
                          "/layui_ext/**", "/login.html", "/webjars/**", "/css/**");
      }
  }
  

• 退出登录清除session

      /** * 跳转到登录 * @return */
      @RequestMapping("toLogin")
      public String toLogin(){ 
       
          WebUtils.getHttpSession().removeAttribute("user");
          return "/";
      }