apache commons fileupload 手记删除临时文件及优化速度_apache commons fileupload 限速-优快云博客

本文链接：https://blog.youkuaiyun.com/ljq900/article/details/5096808

本文介绍了一个Java文件上传处理的方法，包括解析请求、处理表单字段和文件上传逻辑。通过使用commons-fileupload库，实现了文件的内存和磁盘存储管理，并确保了上传过程中的错误处理。

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public void Parse(FileItem fi) {
if (fi.isFormField()) {

                //将form中的路径参数保存为Attribute
                request.setAttribute(fi.getFieldName(), fi.getString());
            } else {
                String path = (String) request.getAttribute(FILEPATHFIELD);
                if (path != null) {
                    try {
                        String fn = path + extractfilename(fi.getName());
                        File f = new File(_resources.getDocBase() + fn);
                        if (fi.isInMemory()) {

//在内存中的直接保存到文件

fi.write(f);
} else {

                            //重命名速度较复制快，适合于大文件
                            ((DiskFileItem) fi).getStoreLocation().renameTo(f);
                        }
                        _resources.lookup(fn);
                    } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                        fi.delete();//删除临时文件
                    }
                }
            }
        }

public static boolean uploadfile(HttpServletRequest req) {
       DiskFileItemFactory factory = null;
       try {
           factory = new DiskFileItemFactory();
            //......
           upload.setProgressListener(...);
           List<?> fileItems = null;
           // if fail then the Repository file can't delete
           /**
           * modify org.apache.commons.fileupload public List
           * parseRequest(RequestContext ctx) throws FileUploadException { try
           * { FileItemIterator iter = getItemIterator(ctx); List items = new
           * ArrayList(); FileItemFactory fac = getFileItemFactory(); if (fac
           * == null) { throw new NullPointerException(
           * "No FileItemFactory has been set."); } while (iter.hasNext()) {
           * FileItemStream item = iter.next(); FileItem fileItem =
           * fac.createItem(item.getFieldName(), item.getContentType(),
           * item.isFormField(), item.getName()); try {
           * Streams.copy(item.openStream(), fileItem.getOutputStream(),
           * true); } catch (FileUploadIOException e) { //here, delete
           * Repository item.delete(); throw (FileUploadException)
           * e.getCause(); } catch (IOException e) { //here, delete Repository
           * item.delete(); throw new IOFileUploadException( "Processing of "
           * + MULTIPART_FORM_DATA + " request failed. " + e.getMessage(), e);
           * } if (fileItem instanceof FileItemHeadersSupport) { final
           * FileItemHeaders fih = item.getHeaders();
           * ((FileItemHeadersSupport) fileItem).setHeaders(fih); }
           * items.add(fileItem); } return items; } catch
           * (FileUploadIOException e) { throw (FileUploadException)
           * e.getCause(); } catch (IOException e) { throw new
           * FileUploadException(e.getMessage(), e); } }
           */
           fileItems = upload.parseRequest(req);
           for (Object i : fileItems) {
                Parse((FileItem) i);
           }
           return true;

       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           if (factory != null) {
           }
       }
       return false;
   }