8

我上传了我input type="file"在我的网络应用程序中浏览的文件。问题是我得到的FileItem列表大小为 0 虽然我可以在下面看到所有上传的文件信息

request-> JakartaMutltiPartRequest-> 文件属性

这是读取文件的java代码

public InputStream parseRequestStreamWithApache(HttpServletRequest request)
  throws FileUploadException, IOException {
  InputStream is = null;
  FileItemFactory factory = new DiskFileItemFactory();
  ServletFileUpload upload = new ServletFileUpload(factory);
  List items = upload.parseRequest(request);
  // here the item size is 0 ,i am not sure why i am not getting my file upload in browser with type="file"
  // but If inspect request in debugger i can see my file realted info in request--->JakartaMutltiPartRequest----->files attribute
  Iterator iter = items.iterator();
  while (iter.hasNext()) {
    FileItem item = (FileItem) iter.next();

    if (!item.isFormField()) {
      is = item.getInputStream();
    }
  }

  return is;
}

编辑：

这是JSP部分：

<form NAME="form1" action="customer/customerManager!parseRequestStreamWithApache.action" ENCTYPE="multipart/form-data"   method="post" >
     <TABLE >
         <tr>
              <th>Upload File</th>
                  <td>
                   <input name="fileUploadAttr" id="filePath"  type="file" value="">
                 </td>
                  <td > 
                 <Input type="submit" value ="uploadFile"/>
                  </td>
          </tr>
    </TABLE>
</form>
4

4 回答 4

14

正如我在对同一个问题的评论中所说，您之前发布过，这很可能是因为您之前已经解析过请求。这些文件是请求正文的一部分，您只能解析一次。

更新：

我通常会以这种方式使用 commons-upload：

if (ServletFileUpload.isMultipartContent(request)) {
    ServletFileUpload fileUpload = new ServletFileUpload();
    FileItemIterator items = fileUpload.getItemIterator(request);
    // iterate items
    while (items.hasNext()) {
        FileItemStream item = items.next();
        if (!item.isFormField()) {
            is = item.openStream();
        }
    }
}
于 2012-10-24T12:16:08.330 回答
3

您应该检查多部分内容

boolean isMultipart = ServletFileUpload.isMultipartContent(request);

if (isMultipart) {
    FileItemFactory factory = new DiskFileItemFactory();
    ServletFileUpload upload = new ServletFileUpload(factory);

    try {
        List items = upload.parseRequest(request);
        Iterator iterator = items.iterator();
        while (iterator.hasNext()) {
            FileItem item = (FileItem) iterator.next();
            if (!item.isFormField()) {
                String fileName = item.getName();

                String root = getServletContext().getRealPath("/");
                File path = new File(root + "/fileuploads");
                if (!path.exists()) {
                    boolean status = path.mkdirs();
                }

                File uploadedFile = new File(path + "/" + fileName);
                item.write(uploadedFile);
            }
        }
    } catch (Exception e) {
于 2012-10-24T12:23:15.060 回答
0

你上传的文件有多大？您可能超过了默认阈值。我认为默认是10K

factory.setSizeThreshold(maxSizeYouWantToHandle);
于 2012-10-24T12:18:51.997 回答
0

如果您使用的是 weblogic 12，请检查 patch_wls1211 是否已安装。我遇到了同样的问题，并在应用 patch_wls1211 后解决了。

于 2014-11-14T18:13:16.810 回答