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//文件保存目录路径 String savePath = pageContext.getServletContext().getRealPath("/") + "attached/";//文件保存目录URL String saveUrl = request.getContextPath() + "/attached/";//定义允许上传的文件扩展名 HashMap extMap = new HashMap(); extMap.put("image", "gif,jpg,jpeg,png,bmp"); extMap.put("flash", "swf,flv"); extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb"); extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");//最大文件大小 long maxSize = 1000000; response.setContentType("text/html; charset=UTF-8");if(!ServletFileUpload.isMultipartContent(request)){ out.println(getError("请选择文件。"));return; }//检查目录 File uploadDir = newFile(savePath);if(!uploadDir.isDirectory()){ out.println(getError("上传目录不存在。"));return; }//检查目录写权限 if(!uploadDir.canWrite()){ out.println(getError("上传目录没有写权限。"));return; } String dirName= request.getParameter("dir");if (dirName == null) { dirName= "image"; }if(!extMap.containsKey(dirName)){ out.println(getError("目录名不正确。"));return; }//创建文件夹 savePath += dirName + "/"; saveUrl+= dirName + "/"; File saveDirFile= newFile(savePath);if (!saveDirFile.exists()) { saveDirFile.mkdirs(); } SimpleDateFormat sdf= new SimpleDateFormat("yyyyMMdd"); String ymd= sdf.format(newDate()); savePath+= ymd + "/"; saveUrl+= ymd + "/"; File dirFile= newFile(savePath);if (!dirFile.exists()) { dirFile.mkdirs(); } FileItemFactory factory= newDiskFileItemFactory(); ServletFileUpload upload= newServletFileUpload(factory); upload.setHeaderEncoding("UTF-8"); List items=upload.parseRequest(request); Iterator itr=items.iterator();while(itr.hasNext()) { FileItem item=(FileItem) itr.next(); String fileName=item.getName();long fileSize =item.getSize();if (!item.isFormField()) {//检查文件大小 if(item.getSize() >maxSize){ out.println(getError("上传文件大小超过限制。"));return; }//检查扩展名 String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();if(!Arrays.asList(extMap.get(dirName).split(",")).contains(fileExt)){ out.println(getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。"));return; } SimpleDateFormat df= new SimpleDateFormat("yyyyMMddHHmmss"); String newFileName= df.format(new Date()) + "_" + new Random().nextInt(1000) + "." +fileExt;try{ File uploadedFile= newFile(savePath, newFileName); item.write(uploadedFile); }catch(Exception e){ out.println(getError("上传文件失败。"));return; } JSONObject obj= newJSONObject(); obj.put("error", 0); obj.put("url", saveUrl +newFileName); out.println(obj.toJSONString()); } }%> privateString getError(String message) { JSONObject obj= newJSONObject(); obj.put("error", 1); obj.put("message", message);returnobj.toJSONString(); }%> |
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