public class FileUploadManager {/** 允许上传的扩展名*/  public static String [] extensionPermit = {"txt", "xls", "zip"}; public FileUploadManager(User user, HttpServletRequest request) throws Exception {super();session = request.getSession();DiskFileItemFactory factory = new DiskFileItemFactory();upload = new ServletFileUpload(factory);SystemManager systemManager = ComponentFactory.getSystemManager();int docSize = Integer.parseInt(systemManager.getSystemConfig(user.getCompanyID(), "DOCUMENT_SIZE_LIMIT").getValue());int maxFileSize = 1024 * 1024 * docSize;upload.setFileSizeMax(maxFileSize); // 设置单个文件的最大上传大小upload.setSizeMax(maxFileSize + 500); // 设置整个request的最大大小upload.setProgressListener(new FileUploadListener(request));extensionPermit = systemManager.getSystemConfig(user.getCompanyID(), "DOCUMENT_EXT_LIMIT").getValue().split(",");//设置文件类型files = upload.parseRequest(request);}class QCServletFileUpload extends ServletFileUpload {private Map textHash = new HashMap();//表单数据private int fileItemCount = 0;// 重载parseRequest方法public List parseRequest(HttpServletRequest request) throws FileUploadException {List items = new ArrayList();//文件try {FileItemIterator iter = getItemIterator(request);FileItemFactory fac = getFileItemFactory();while (iter.hasNext()) {FileItemStream item = iter.next();FileItem fileItem = fac.createItem(item.getFieldName(), item.getContentType(), item.isFormField(), item.getName());Streams.copy(item.openStream(), fileItem.getOutputStream(), true);//fileItem.getOutputStream().close();if (fileItem.isFormField()) { // 处理form field
                    textHash.put(fileItem.getFieldName(), fileItem);} else if (fileItem.getName() != null && fileItem.getName().length() > 0) {// 处理file fieldString fileExtension = FilenameUtils.getExtension(fileItem.getName());if(!ArrayUtils.contains(FileUploadManager.extensionPermit, fileExtension)){fileItemCount++;items.add(fileItem);}else{throw new FileUploadException("文件" + fileItem.getName() + "类型不支持.");}}}} catch (Exception e) {e.printStackTrace();throw new FileUploadException(e.getMessage(), e);}return items;}}