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 field                    String 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;    }}