如何在Struts 2中使用ServletFileUpload的parseRequest上传文件? [重复]

问题描述 投票:0回答:4

我上传文件,并在我的网络应用程序中使用

input type="file"
浏览该文件。

问题是,我得到的

FileItem
列表大小为
0
,尽管我可以在

下看到所有上传的文件信息
request -> JakartaMutltiPartRequest -> files attributes

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>
jsp servlets file-upload struts2 apache-commons-fileupload
4个回答
14
投票

正如我在对同一问题的评论中所说,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();
        }
    }
}

3
投票

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) {

您可以在此处找到此类 servlet 的示例。


0
投票

您上传的文件有多大?您可能超过了默认阈值。我认为默认是10K

factory.setSizeThreshold(maxSizeYouWantToHandle);

0
投票

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,应用 patch_wls1211 后解决了。

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