java 给 Apache HttpPost 添加参数
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Add parameters to Apache HttpPost
提问by Alex
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.
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。
This is the client-side code: ...
这是客户端代码：...
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());
...
...
on the server side, we've got:
在服务器端，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.
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:
现在，我不知道如何将上述参数添加到请求中……我尝试使用 StringBody 并将其添加到 MultiPartEntity，但我在以下位置收到 NullPointerException：
String author = request.getParameter("author");
which means that the parameter isn't seen as a parameter, maybe?
这意味着参数不被视为参数，也许？
The only was I got it working was setting these parameters as Headers (setHeader and getHeader), but this is not an option.
我唯一让它工作的是将这些参数设置为标题（setHeader 和 getHeader），但这不是一个选项。
Any advice? Or maybe can you redirect me to a fullexample of file+parameter upload?
Thanks,
Alex
有什么建议吗？或者您能否将我重定向到文件+参数上传的完整示例？
谢谢，
亚历克斯
回答by YoK
Try using similar code as pasted here :
尝试使用与此处粘贴的类似代码：
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();
You will also need to add the external jar apache-mime4j-0.6.jar (org.apache.james.mime4j) otherwise
您还需要添加外部 jar apache-mime4j-0.6.jar (org.apache.james.mime4j) 否则
reqEntity.addPart("bin", bin);
would not compile.
不会编译。
回答by lishunli
if you use servlet 3.0, you can try add @MultipartConfig onto your servlet.
如果您使用 servlet 3.0，您可以尝试将 @MultipartConfig 添加到您的 servlet。
