ContentType问题与commons-upload和httpcomponent客户端 [英] ContentType issue with commons-upload and httpcomponent client

问题描述

$ p $ H $ p $ H $ p $ HttpPost HttpPost = new HttpPost（myURL） ;
httppost.setHeader（Content-type，
multipart / form-data; boundary = stackoverflow）;
httppost.setHeader（Accept，text / xml）;
MultipartEntity reqEntity = new multipartEntity（
HttpMultipartMode.BROWSER_COMPATIBLE，stackoverflow，
Charset.forName（UTF-8））;
FileBody bin = new FileBody（myFile）;
reqEntity.addPart（File，bin）;
httppost.setEntity（reqEntity）;
HttpResponse响应= client.execute（httppost）;

在服务器端，有一个

<$ pre $
$ b $ p
$ b $ p $ {code $>请求：
$ b

  FileItemFactory factory = new DiskFileItemFactory（204800，new File（
 uploadDirectory））; 
 ServletFileUpload fileUpload = new ServletFileUpload（factory）; 
尝试{
 List< FileItem> items = fileUpload.parseRequest（request）; 
 Iterator< FileItem> itemIterator = items.iterator（）; 
 while（itemIterator.hasNext（））{
 FileItem item = itemIterator.next（）; 
 .... 
  

它工作正常，但问题在于我的FileItem的Content-type是空的，我有一个NullPointerException以后。然而，当我做客户端的bin.getContentType（）我得到文本/ XML。

有人知道什么时候这种内容类型丢失，如何解决？

解决方案

您正在使用错误的模式。在BROWSER_COMPATIBLE模式下，内容类型不会发送到服务器。您需要使用STRICT模式发送content_type。

然而，STRICT可能不适合您，因为某些网络服务器不喜欢它。

FileBody的默认内容类型是application / octet-stream。你可以像这样改变它，

  FileBody bin = new FileBody（new File（myFile），text / html）; 
  

I am trying to develop a Http client which uploads a file with httpcomponents:

HttpPost httppost = new HttpPost(myURL);
httppost.setHeader("Content-type",
       "multipart/form-data; boundary=stackoverflow");
httppost.setHeader("Accept", "text/xml");
MultipartEntity reqEntity = new multipartEntity(
       HttpMultipartMode.BROWSER_COMPATIBLE,"stackoverflow",
       Charset.forName("UTF-8"));
FileBody bin = new FileBody(myFile);
reqEntity.addPart("File", bin);
httppost.setEntity(reqEntity);
HttpResponse response = client.execute(httppost);

On server side, there is a

doPost(HttpServletRequest request, HttpServletResponse response)

method which parse the request :

FileItemFactory factory = new DiskFileItemFactory(204800, new File(
                    uploadDirectory));
ServletFileUpload fileUpload = new ServletFileUpload(factory);
try {
     List<FileItem> items = fileUpload.parseRequest(request);
     Iterator<FileItem> itemIterator = items.iterator();
     while (itemIterator.hasNext()) {
          FileItem item = itemIterator.next();
           ....

It works fine but the problem is that my FileItem's Content-type is null and I have a NullPointerException later. However when I do bin.getContentType() on client side I get "text/xml".

Does someone know when this Content type is lost and how to fix that?

解决方案

You are using the wrong mode. In BROWSER_COMPATIBLE mode, the content-type is not sent to server. You need to use STRICT mode to send content_type.

However, STRICT may not work for you because some web servers don't like it.

The default content-type for FileBody is application/octet-stream. You can change it like this,

  FileBody bin = new FileBody(new File(myFile), "text/html");

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