spring mvc上传、下载的实现

下载

//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);
    }

上传

@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";
    }

spring配置文件

<!-- 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>

文件下载参见 http://www.iteye.com/topic/1125784 这位老兄的这篇blog，这位老兄测试说存在问题，本人测试未发现有存在。