spring mvc上传、下载的实现

//下载

    @RequestMapping(value="/download")

    public ResponseEntity<byte[]> download() throws IOException{

        String fileName = "test.txt";

        File downloadFile = new File("D:/test.txt");

        HttpHeaders headers = new HttpHeaders();

        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

        headers.setContentDispositionFormData("attachment", fileName);  

        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(downloadFile),

                                          headers, HttpStatus.CREATED);

    }

@RequestMapping(value = "/upload", method = RequestMethod.POST)

    public String upload(@RequestParam("name") String name,

            @RequestParam("file") MultipartFile file,RedirectAttributes attributes){

        System.out.println("param:"+name);

        if(!file.isEmpty()){

            System.out.println("upload ok");

        }

        attributes.addAttribute("name", "upload success");

        return "redirect:/login.jsp";

    }

<!-- 文件上传解析器 -->

    <bean id="multipartResolver"

        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

        <!-- one of the properties available; the maximum file size in bytes -->

        <property name="maxUploadSize" value="-1"/>

    </bean>