Java实现文件的上传下载
文件上传，下载的方法：
上传代码
1 /** 2 * 文件上传、保存 3 * 4 * @param mapping 5 * @param form 6 * @param request 7 * @param response 8 * @return 9 * @throws IOException 10 */ 11 @SuppressWarnings("unchecked") 12 public ActionForward tzupload(ActionMapping mapping, ActionForm form, 13 HttpServletRequest request, HttpServletResponse response) 14 throws Exception { 15 BaseActionForm cForm = (BaseActionForm) form; 16 Dto reDto = cForm.getParamAsDto(request); 17 String uuid = new UUIDGenerator().create(); 18 String ggid = new UUIDGenerator().create(); 19 UserInfoVo userInfo = WebUtils.getSessionContainer(request).getUserInfo(); 20 String gglx = "ggxx"; 21 reDto.put("uuid", uuid); 22 reDto.put("ggid", ggid); 23 reDto.put("yxbz", "Y"); 24 reDto.put("lrr_dm", userInfo.getUserid()); 25 26 FormFile formfile = cForm.getFile1(); 27 String filename = formfile.getFileName();// 获取文件的名字 28 // 获取当前时间 29 Date date = new Date(); 30 SimpleDateFormat simpledate = new SimpleDateFormat("yyyy-MM-dd"); 31 String dqsj = simpledate.format(date); 32 String urlfile = readProperties.getProperties().getProperty( 33 "FILEUPLOAD1") 34 + formfile; 35 final String wjlj = readProperties.getProperties().getProperty( 36 "FILEUPLOAD2") 37 + formfile; 38 39 if (filename.length() > 0) { 40 reDto.put("wjlj", wjlj); 41 reDto.put("wjmc", filename); 42 reDto.put("ggid", ggid); 43 reDto.put("gglx", gglx); 44 reDto.put("scsj", dqsj); 45 reDto.put("lrrq", dqsj); 46 reDto.put("yxbz", "Y"); 47 reDto.put("lrr_dm", reDto.getAsString("lrr_dm")); 48 mobilesBsService.updatewjlj(reDto); 49 50 File file = new File(urlfile); 51 if (file.exists()) { 52 file.mkdir();// 创建路径 53 } 54 File filecreate = new File(urlfile); 55 // 检查路径是否 56 if (!filecreate.exists()) { 57 FileOutputStream out = new FileOutputStream(filecreate); 58 out.write(formfile.getFileData()); 59 out.flush(); 60 out.close(); 61 } else { 62 FileOutputStream out = new FileOutputStream(filecreate); 63 out.write(formfile.getFileData()); 64 out.flush(); 65 out.close(); 66 } 67 68 } 69 Dto pDto = mobilesBsService.saveTzggDatas(reDto); 70 pDto.put("gglx", gglx); 71 mobilesBsService.createHtml(pDto); 72 String wjname = ggid + ".html"; 73 pDto.put("wjname", wjname); 74 mobilesBsService.saveHtml(pDto); 75 76 setOkTipMsg("文件上传成功", response); 77 return mapping.findForward(null); 78 79 } 80
下载代码
1 /** 2 * 文件下载 3 * 4 * @param mapping 5 * @param form 6 * @param request 7 * @param reponse 8 * @return 9 * @throws Exception 10 */ 11 public ActionForward downloadfile(ActionMapping mapping, ActionForm form, 12 HttpServletRequest request, HttpServletResponse response) 13 throws Exception, Exception { 14 // private final static String 15 String filename = request.getParameter("wjmc"); 16 filename = new String(filename.getBytes("ISO-8859-1"), "utf-8"); 17 String filesavepath = request.getRealPath("/upload/fileupload1"); 18 //String path = findFileSavePathByFileName(filename,filesavepath); 19 //得到要下载的文件 20 File file = new File(filesavepath+"\\"+filename); 21 if(!file.exists()){ 22 request.setAttribute("message", "要下载的文件已删除"); 23 request.getRequestDispatcher("/message.jsp").forward(request, response); 24 } 25 //处理文件名 26 String realname = filename.substring(filename.indexOf("_")+1); 27 response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realname, "UTF-8")); 28 //创建文件输入流 29 FileInputStream in = new FileInputStream(file); 30 //创建输出流 31 OutputStream out = response.getOutputStream(); 32 //创建缓存区 33 byte buffer[] = new byte[1024]; 34 int len = 0; 35 while((len = in.read(buffer))>0){ 36 //输出缓冲区的内容到浏览器，实现文件下载 37 out.write(buffer, 0, len); 38 } 39 //关闭文件输入流 40 in.close(); 41 //关闭输出流 42 out.close(); 43 return mapping.findForward(null); 44 }
1 /** 2 * 通过文件名和上传文件根目录找出要下载的文件 3 * @param filename 4 * @param saveRootPath 5 * @return 6 */ 7 public String findFileSavePathByFileName(String filename, 8 String saveRootPath) { 9 int hashcode = filename.hashCode(); 10 int dir1 = hashcode & 0xf; // 0--15 11 int dir2 = (hashcode & 0xf0) >> 4; // 0-15 12 String dir = saveRootPath + "\\" + dir1 + "\\" + dir2; // upload\2\3 13 // upload\3\5 14 File file = new File(dir); 15 if (!file.exists()) { 16 // 创建目录 17 file.mkdirs(); 18 } 19 return dir; 20 }
