Java实现文件的上传下载

文件上传，下载的方法：

上传代码

/**
     * 文件上传、保存
     * 
     * @param mapping
     * @param form
     * @param request
     * @param response
     * @return
     * @throws IOException
     */
    @SuppressWarnings("unchecked")
    public ActionForward tzupload(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        BaseActionForm cForm = (BaseActionForm) form;
        Dto reDto = cForm.getParamAsDto(request);
        String uuid = new UUIDGenerator().create();
        String ggid = new UUIDGenerator().create();
        UserInfoVo userInfo = WebUtils.getSessionContainer(request).getUserInfo();
        String gglx = "ggxx";
        reDto.put("uuid", uuid);
        reDto.put("ggid", ggid);
        reDto.put("yxbz", "Y");
        reDto.put("lrr_dm", userInfo.getUserid());
        
        FormFile formfile = cForm.getFile1();
        String filename = formfile.getFileName();// 获取文件的名字
        // 获取当前时间
        Date date = new Date();
        SimpleDateFormat simpledate = new SimpleDateFormat("yyyy-MM-dd");
        String dqsj = simpledate.format(date);
        String urlfile = readProperties.getProperties().getProperty(
                "FILEUPLOAD1")
                + formfile;
        final String wjlj = readProperties.getProperties().getProperty(
                "FILEUPLOAD2")
                + formfile;
        
        if (filename.length() > 0) {
            reDto.put("wjlj", wjlj);
            reDto.put("wjmc", filename);
            reDto.put("ggid", ggid);
            reDto.put("gglx", gglx); 
            reDto.put("scsj", dqsj);
            reDto.put("lrrq", dqsj);
            reDto.put("yxbz", "Y");
            reDto.put("lrr_dm", reDto.getAsString("lrr_dm"));
            mobilesBsService.updatewjlj(reDto);

            File file = new File(urlfile);
            if (file.exists()) {
                file.mkdir();// 创建路径
            }
            File filecreate = new File(urlfile);
            // 检查路径是否
            if (!filecreate.exists()) {
                FileOutputStream out = new FileOutputStream(filecreate);
                out.write(formfile.getFileData());
                out.flush();
                out.close();
            } else {
                FileOutputStream out = new FileOutputStream(filecreate);
                out.write(formfile.getFileData());
                out.flush();
                out.close();
            }

        }
        Dto pDto = mobilesBsService.saveTzggDatas(reDto);
        pDto.put("gglx", gglx);
        mobilesBsService.createHtml(pDto);
        String wjname = ggid + ".html";
        pDto.put("wjname", wjname);
        mobilesBsService.saveHtml(pDto);
        
        setOkTipMsg("文件上传成功", response);
        return mapping.findForward(null);

    }
    

下载代码

/**
     * 文件下载
     * 
     * @param mapping
     * @param form
     * @param request
     * @param reponse
     * @return
     * @throws Exception 
     */
    public ActionForward downloadfile(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception, Exception {
        // private final static String
        String filename = request.getParameter("wjmc");
        filename = new String(filename.getBytes("ISO-8859-1"), "utf-8");
        String filesavepath = request.getRealPath("/upload/fileupload1");
        //String path = findFileSavePathByFileName(filename,filesavepath);
        //得到要下载的文件
        File file = new File(filesavepath+"\"+filename);
        if(!file.exists()){
            request.setAttribute("message", "要下载的文件已删除");
            request.getRequestDispatcher("/message.jsp").forward(request, response);
        }
        //处理文件名
        String realname = filename.substring(filename.indexOf("_")+1);
        response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realname, "UTF-8"));
        //创建文件输入流
        FileInputStream in = new FileInputStream(file);
        //创建输出流
        OutputStream out = response.getOutputStream();
        //创建缓存区
        byte buffer[] = new byte[1024];
        int len = 0;
        while((len = in.read(buffer))>0){
            //输出缓冲区的内容到浏览器，实现文件下载
        out.write(buffer, 0, len);
        }
        //关闭文件输入流
        in.close();
        //关闭输出流
        out.close();
        return mapping.findForward(null);
    }

    /**
     * 通过文件名和上传文件根目录找出要下载的文件
     * @param filename
     * @param saveRootPath
     * @return
     */
    public String findFileSavePathByFileName(String filename,
            String saveRootPath) {
        int hashcode = filename.hashCode();
        int dir1 = hashcode & 0xf; // 0--15
        int dir2 = (hashcode & 0xf0) >> 4; // 0-15
        String dir = saveRootPath + "\" + dir1 + "\" + dir2; // upload23
                                                                // upload35
        File file = new File(dir);
        if (!file.exists()) {
            // 创建目录
            file.mkdirs();
        }
        return dir;
    }