我想从jsp上传文件，在我的servlet中处理它，然后从servlet传递与Restful webservices相同的文件。
HTML：
<html>
<body>
<h1>Upload File with RESTFul WebService</h1>
<form action="rest/fileupload" method="post" enctype="multipart/form-data">
<p>
Choose a file : <input type="file" name="file" />
</p>
<input type="submit" value="Upload" />
</form>
</body>
</html>
的Servlet
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
FileBody fileContent= new FileBody(new File(fileName));
StringBody comment = new StringBody("Filename: " + fileName);
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("file", fileContent);
httppost.setEntity(reqEntity);
HttpResponse response = httpclient.execute(httppost);
HttpEntity resEntity = response.getEntity();
但是在这里，当我从我自己的servlet中的jsp获取文件时，由于Multipart Form Data，我只能将它作为FileItem获取。现在，我如何将FileItem放在FileBody中，以便将其作为MultipartEntity发送。请注意，我不想直接从jsp页面调用Webservices。