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