将参数添加到Apache HttpPost [英] Add parameters to Apache HttpPost

问题描述

我正在尝试将文件发送到Servlet。
除了这个文件，我还必须发送一些参数（即名称/ ID，日期和其他一些参数）。我在客户端使用HttpClient，在服务器端使用ServerFileUpload。

I'm trying to send a file to a Servlet. Along with this file, I also have to send some parameters (i.e. name/id, date and a few others). I'm using HttpClient on client-side and ServerFileUpload on server-side.

这是客户端代码：
...

This is the client-side code: ...

String url = "http://localhost:8080/RicezioneServlet/RicezioneServlet";
HttpClient httpclient = new DefaultHttpClient();
HttpPost postMethod = new HttpPost(url);
MultipartEntity mpe = new MultipartEntity();
//I'm sending a .zip file
ContentBody cb = new FileBody(fileToSend,"application/zip");
mpe.addPart("file", cb);
postMethod.setEntity(mpe);
HttpResponse resp = httpclient.execute(postMethod);
HttpEntity respEntity = resp.getEntity();
System.out.println(resp.getStatusLine());

...

方面，我们有：

ServletFileUpload sup = new ServletFileUpload();
FileItemIterator it = sup.getItemIterator(request);
FileItemStream item = it.next();
InputStream ios = item.openStream();
//read from ios and write to a fileoutputstream.

现在，我不知道如何将上述参数添加到请求中...我试过使用StringBody并将其添加到MultiPartEntity，但我得到一个NullPointerException：

Now, I don't know how to add the aforementioned parameters to the request... I tried to use a StringBody and to add it to the MultiPartEntity, but I get a NullPointerException at:

String author = request.getParameter("author");

这意味着该参数不被视为参数，也许？

which means that the parameter isn't seen as a parameter, maybe?

我唯一能做的就是将这些参数设置为Headers（setHeader和getHeader），但这不是一个选项。

The only was I got it working was setting these parameters as Headers (setHeader and getHeader), but this is not an option.

有什么建议吗？或者你可以将我重定向到文件+参数上传的完整示例吗？

谢谢，

Alex

Any advice? Or maybe can you redirect me to a full example of file+parameter upload?
Thanks,
Alex

推荐答案

尝试使用粘贴在此处的类似代码：

Try using similar code as pasted here :

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);

FileBody bin = new FileBody(new File(fileName));
StringBody comment = new StringBody("Filename: " + fileName);

MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("bin", bin);
reqEntity.addPart("comment", comment);
httppost.setEntity(reqEntity);

HttpResponse response = httpclient.execute(httppost);
HttpEntity resEntity = response.getEntity();

您还需要添加外部jar apache-mime4j-0.6.jar（org.apache。 james.mime4j）否则

You will also need to add the external jar apache-mime4j-0.6.jar (org.apache.james.mime4j) otherwise

reqEntity.addPart("bin", bin);

无法编译。

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