java web 中上传文件和下载文件代码片段

来源：互联网发布：单片机程序开发编辑：程序博客网时间：2024/05/27 12:22
    /**     * Purpose：上传文档     *      * @param req     * @param fileTitle     * @param fileType     * @param fileDesc     * @return     */    @RequestMapping("upload")    public ModelAndView upload(HttpServletRequest req, String fileType, String fileDesc, String share) {        UserAllInfo userAll = (UserAllInfo) req.getSession().getAttribute("userAll");        ModelAndView mav = new ModelAndView();        // 获取文件的大小        String fileSize = "";        int length = req.getContentLength();        //转换成KB        double len1 = (double) (Math.round((length / 1024) * 100)) / 100;        //转换成MB        double len2 = (double) (Math.round((len1 / 1024) * 100)) / 100;        if (len2 > 1) {            fileSize = String.valueOf(len2) + "MB";        } else {            fileSize = String.valueOf(len1) + "KB";        }        //将请求转换成处理文件的请求        MultipartRequest mreq = (MultipartRequest) req;        //文件上传专用类        MultipartFile mfile = mreq.getFile("uploadFile");        // 得到上下文路径        String root = req.getSession().getServletContext().getRealPath("/");        File dir = new File(root);        // 获取文件名和文件的mime类型        String str = mfile.getOriginalFilename();        String[] st = str.split("\\.");        File savedFile = null;        try {            //在指定目录中创建一个新的空文件，文件名称加前缀"upload_"            savedFile = File.createTempFile("upload_", mfile.getOriginalFilename(), dir);            //将缓冲区的内容复制到新创建的文件中            FileCopyUtils.copy(mfile.getInputStream(), new FileOutputStream(savedFile));        } catch (Exception e) {            e.printStackTrace();        }        String path = savedFile.getPath();        // 将文件的信息封装在对象中        FileInfo file = new FileInfo();        if (userAll != null) {            file.setUploadPersonId(userAll.getUser().getUserId());        } else {            mav.setViewName("login");            return mav;        }        file.setFileName(st[0]);        file.setFilePath(path);        Date date = new Date();        file.setUploadDate(date);        file.setFileSize(fileSize);        file.setFileType(fileType);        file.setFileForm(st[1]);        if ("superman".equals(userAll.getUser().getUserNumber())) {            file.setFileShare("Y");            file.setCheckFlag("Y");        } else {            file.setFileShare(share);            file.setCheckFlag("N");        }        file.setDeleteFlag("N");        file.setDownloadTimes(0);        // 保存文件的信息        boolean bool = fileSer.saveFile(file);        String userNumber = userAll.getUser().getUserNumber();        //设置跳转界面        mav.setViewName("jsp/person/upload");        logSer.saveLog("用户\"" + userNumber + "\"上传文件\"" + file.getFileName() + "\"");        mav.getModel().put("bool", bool);        return mav;    }    /**     * Purpose：下载文档     *      * @param fileId 文件id     * @return     */    @RequestMapping("download")    public void download(Integer fileId, HttpServletResponse resp) {        FileInfo file = new FileInfo();        //通过文件id获取文件的基本信息        file = fileSer.getFileById(fileId);        // 根据文件后缀名设置文件的mime类型        String mime = "application/";        switch (file.getFileForm()) {        case "doc":            mime = mime + "msword";            break;        case "docx":            mime = mime + "msword";            break;        case "pdf":            mime = mime + "pdf";            break;        case "xls":            mime = mime + "vnd.ms-excel";        case "ppt":            mime = mime + "vnd.ms-powerpoint";            break;        case "txt":            mime = "text/plain";            break;        default:            break;        }        resp.setContentType(mime);        String fileName = file.getFileName();        String name = "";        try {            // 将文件名使用utf-8编码格式编码，使其中的中文字符可以正常显示            name = URLEncoder.encode(fileName, "utf-8");        } catch (UnsupportedEncodingException e1) {            e1.printStackTrace();        }        // 弹框选择保存路径        resp.setHeader("content-disposition", "attachment;filename=" + name + "." + file.getFileForm()                + ";filename*=utf-8''" + name + "." + file.getFileForm());        String filePath = file.getFilePath();        InputStream is = null;        OutputStream os = null;        try {            is = new BufferedInputStream(new FileInputStream(filePath));            os = new BufferedOutputStream(resp.getOutputStream());            byte[] buff = new byte[1024];            @SuppressWarnings("unused")            int count;            while ((count = is.read(buff)) != -1) {                os.write(buff);            }            //修改下载次数            fileSer.update(fileId);        } catch (Exception e) {            e.printStackTrace();        } finally {            //最后，要记得关闭输入流和输出流            if (is != null) {                try {                    is.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            if (os != null) {                try {                    os.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }
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