Spring MVC 全局异常处理&文件上传

Spring MVC 全局异常处理

使用SimpleMappingExceptionResolver实现异常处理

在welcome-servlet.xml进行如下配置:

 <bean
         class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
         <property name="exceptionMappings">
             <props>
                 <prop key="cn.jbit.Controler.UserController">error</prop>
             </props>
         </property>
     </bean>

然后注释掉局部异常

 /*@ExceptionHandler(value={UserException.class})
  public String handlerException(UserException exception,HttpServletRequest request){

   request.setAttribute("e",exception);
   return "error";

 }*/

最后在error.jsp页面输出

${exception.message}

Spring MVC 上传文件

1.在welcome-servlet.xml配置MultipartResolver

 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

 <property name="maxUploadSize" value="5000000"></property>

 </bean> 

2.在add.jsp页面编写文件上传表单页面和控制器

3.在UserController界面接收

 @RequestMapping(value = "/addSave", method = RequestMethod.POST)
     public String addSave(@Validated User user, BindingResult result,
             MultipartFile upload, HttpServletRequest request)
             throws IOException {
         String uploadFilePath = request.getSession().getServletContext()
                 .getRealPath("/statics/upload");
         System.out.println(upload.getOriginalFilename());
         System.out.println(upload.getContentType());
         System.out.println(upload.getName());

         if (!upload.isEmpty()) {
             File file = new File(uploadFilePath + File.separator
                     + upload.getOriginalFilename());
             FileUtils.copyInputStreamToFile(upload.getInputStream(), file);
         }

         userList.put(user.getId(), user);
         return "redirect:/list";
     }

注:

getOriginalFilename():获取上传文件的原名

getContentType():获取文件MIME类型

getName():获取表单中文件组件的名字