Spring MVC文件上传及全局异常处理器

添加依赖

<!--文件上传-->
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>

配置文件上传解析器

<!--配置文件上传解析器-->
<bean id="multipartResolver" 
      class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="5242880" />
    <property name="defaultEncoding" value="UTF-8" />
</bean>

测试

• 编写controller

  @Controller
  @RequestMapping("/account")
  public class AccountController {
  
      @RequestMapping(path="/upload")
      public String upload(HttpServletRequest request, 
                               MultipartFile upload,Model model) throws IOException {
          System.out.println("springmvc方式的文件上传");
          //获取要上传的文件目录
          String path = 
              request.getSession().getServletContext().getRealPath("/uploads");
          System.out.println("path:"+path);
          //根据文件上传的目录创建File对象，如果不存在则创建1个File对象
          File file = new File(path);
          if(!file.exists()){
              //创建一个file对象
              file.mkdirs();
          }
          //获取文件上传名称
          String filename = upload.getOriginalFilename();
          //完成文件上传
          upload.transferTo(new File(path,filename));
  
          model.addAttribute("msg", "欢迎你 springmvc");
          return "success";
      }
  }
  

• 在index.jsp里面定义超链接

      <form action="/account/upload" method="post" enctype="multipart/form-data">
          文件: <input type="file" name="upload"></input>
          <input type="submit" value="提交">
      </form>
  

全局异常处理器

如果不加以异常处理，错误信息肯定会抛在浏览器页面上，这样很不友好，所以必须进行异常处理。

异常处理思路

系统的dao、service、controller出现都通过throws Exception向上抛出，最后由springmvc前端控制器交由异常处理器进行异常处理，如下图：

创建异常处理器

@Component
public class CustomExceptionResolver implements HandlerExceptionResolver {

	@Override
	public ModelAndView resolveException(HttpServletRequest request,
					HttpServletResponse response, Object handler, Exception ex) {
		ModelAndView modelAndView = new ModelAndView();
		modelAndView.addObject("message", ex.getMessage());
		modelAndView.setViewName("error");
		return modelAndView;
	}

}

测试

• 编写controller

@Controller
@RequestMapping("/account")
public class AccountController {

   @RequestMapping("/findAccount14")
    public String findAccount14(Model model) {
        model.addAttribute("msg", "欢迎你 springmvc");
        //模拟异常信息
        int i = 10/0;
        return "success";
    }
}

• 在index.jsp里面定义超链接

<a href="/account/findAccount14">异常处理器</a>