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; // upload\2\3
                                                                 // upload\3\5
         File file = new File(dir);
         if (!file.exists()) {
             // 创建目录
             file.mkdirs();
         }
         return dir;
     }