Spring MVC實現文件上傳下載

直接上代碼

該配置的還需要spring容器配置好.例如上傳的組件..

下載

public void downLoadFile(HttpServletResponse response, File file) {
        if (file == null || !file.exists()) {
            return;
        }
        OutputStream out = null;
        try {
            response.reset();
            response.setContentType("application/octet-stream; charset=utf-8");
            response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());
            out = response.getOutputStream();
            out.write(FileUtils.readFileToByteArray(file));
            out.flush();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

下載的另一種方法

    @RequestMapping("/download")
    public ResponseEntity<byte[]> download(Integer bid, HttpServletRequest httpServletRequest,
                                           HttpServletResponse response) throws IOException {
        response.setContentType("text/html;charset=UTF-8");
        if(bid==null){
            response.getWriter().print("下載的文件不存在..");
        }
        Download download= downloadService.selectByBid(bid);

        if(download==null){
            response.getWriter().print("下載的文件不存在..");
            return null;
        }
        File file=new File(httpServletRequest.getRealPath("/")+download.getFileurl());
        if(file.exists()==false){
            response.getWriter().print("下載的文件不存在..");
        }
        HttpHeaders headers = new HttpHeaders();
        String fileName=new String((download.getDownbook()+".pdf").getBytes("UTF-8"),"iso-8859-1");//爲了解決中文名稱亂碼問題
        response.setContentType("multipart/form-data");
        response.setHeader("Content-Disposition", "attachment;fileName="
                + fileName);
       // headers.setContentDispositionFormData("attachment", fileName);
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),
                headers, HttpStatus.CREATED);
    }

上傳(多文件)

@RequestMapping("/upload.do")
    public String upload(HttpServletRequest request,
            HttpServletResponse response) throws IOException {
               // 這裏我用到了jar包
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        if (multipartResolver.isMultipart(request)) {
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;

            Iterator<String> iter = multiRequest.getFileNames();
            while (iter.hasNext()) {
                MultipartFile file = multiRequest.getFile((String) iter.next());
                if (file != null) {
                    String fileName = file.getOriginalFilename();

                    String path1 = Thread.currentThread()
                            .getContextClassLoader().getResource("").getPath()
                            + "download" + File.separator;

                    //  下面的加的日期是爲了防止上傳的名字一樣
                    String path = path1
                            + new SimpleDateFormat("yyyyMMddHHmmss")
                                    .format(new Date()) + fileName;

                    File localFile = new File(path);

                    file.transferTo(localFile);
                }

            }

        }
        return "uploadSuccess";

    }