On Thu, Apr 23, 2009 at 10:33:27AM +0100, Richard Jones wrote:
> Hi,
>
>>> I need to assemble a multi-part request, consisting of some normal
>>> http headers, an xml document in the first mime-part, and a binary
>>> document in the second mime-part. I need to augment the mime-parts
>>> with their own http headers, also; specifically a Content-Type
>>> declaration and a Content-Disposition header for each one (which I
>>> believe is allowed by the MIME standard, from what I can discern
>>> from the rfc). My current code looks like this:
>>>
>>> HttpClient client = new HttpClient();
>>> PostMethod post = new PostMethod(target);
>>>
>>> // set the request headers
>>> post.setRequestHeader("Slug", slug);
>>> post.setRequestHeader("X-On-Behalf-Of", user);
>>>
>>> // construct the xml and binary file parts
>>> FilePart xmlPart = new FilePart("atom", new File(xml), "text/xml", null);
>>> FilePart binaryPart = new FilePart("binary", new File(binary));
>>>
>>> // make the multipart request body
>>> Part[] parts = { xmlPart, binaryPart };
>>> MultipartRequestEntity re = new MultipartRequestEntity(parts,
>>> post.getParams());
>>> post.setRequestEntity(re);
>>>
>>> // execute the post
>>> client.executeMethod(post);
>>>
>
>> The Content-Disposition header will be automatically generated by HttpClient.
>> If you want a greater control over the process of MIME content generation,
>> please consider upgrading to HttpClient 4.0 which has much improved MIME
>> capabilities based on Apache mime4j.
>>
>
> I have upgraded my client to using httpclient 4.0 beta 2 with the same
> version of httpmime and httpcore, but am stuck on where in the API I can
> now set my custom Content-Disposition.
>
>> http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/httpmime/src/examples/org/apache/http/examples/entity/mime/ClientMultipartFormPost.java
>>
>>
>
> Following this example, I have re-written my code as follows:
>
> HttpClient client = new DefaultHttpClient();
> HttpPost post = new HttpPost(target);
>
> // set the request headers
> post.setHeader("Slug", slug);
> post.setHeader("X-On-Behalf-Of", user);
>
> // construct the xml and binary file parts
> FileBody xmlBody = new FileBody(new File(xml));
> FileBody binBody = new FileBody(new File(binary));
>
> MultipartEntity reqEntity = new MultipartEntity();
> reqEntity.addPart("atom", xmlBody);
> reqEntity.addPart("binary", binBody);
>
> post.setEntity(reqEntity);
> HttpResponse response = client.execute(post);
>
> But I still don't see any way of passing in http headers for the mime
> parts. I presume that I'm missing something fundamental about how to
> use httpclient 4 with the httpmime extension, but I can't find any
> examples of doing what it is that i'm trying to do to follow.
>
> What am I missing?
>
You will have to subclass FormBodyPart class and override its
#generateContentDisp() method. You will also have to implement a custom
HttpEntity similar to MultipartEntity shipped with HttpMime, which makes use of
the extended FormBodyPart class.
Hope this helps,
Oleg
> Thanks again,
>
> Richard
>
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