Is there a java utility to produce http multi-part responses?

Question

I am building a web-service that returns a multipart response. I know the format for constructing a multi-part response; and I will build my own tools if I can't find existing tools.

Perhaps I just need help with my google-foo. Everything I find is about POSTing or consuming multi-part messages. Nothing about producing multi-part responses.

A more useful Google keyword may be comet and/or multipart/x-mixed-replaced. — BalusC
– BalusC, Commented Jan 26, 2011 at 21:07
Did you find a suitable library or did you end up building your own? I'm hitting the same problem now. — Wysawyg
– Wysawyg, Commented May 4, 2011 at 10:26

aweigold · Accepted Answer · 2011-06-24 19:56:07Z

6

You can use oreilly servlets http://www.servlets.com/cos/

An example is in the javadoc: http://www.servlets.com/cos/javadoc/com/oreilly/servlet/MultipartResponse.html

import com.oreilly.servlet.MultipartResponse

//javax.servlet.http.HttpServletResponse res
MultipartResponse multi = new MultipartResponse(res);

multi.startResponse("text/plain");
out.println("On your mark");
multi.endResponse();

try { Thread.sleep(1000); } catch (InterruptedException e) { }

multi.startResponse("text/plain");
out.println("Get set");
multi.endResponse();

try { Thread.sleep(1000); } catch (InterruptedException e) { }

multi.startResponse("image/gif");
ServletUtils.returnFile(req.getRealPath("/images/go.gif"), out);

multi.finish();

answered Jun 24, 2011 at 19:56

aweigold

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bwalenz · Accepted Answer · 2011-01-26 20:49:53Z

-1

Have you tried the Apache HttpClient project? I haven't looked at it since it broke out from the Apache Commons stuff, but I know it did a lot with multi-part responses.

This is for consuming - not sure if there is anything for producing, but it might be a place to start.

http://hc.apache.org/httpclient-3.x/methods/multipartpost.html

answered Jan 26, 2011 at 20:49

bwalenz

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2 Comments

BalusC Over a year ago

This is not for consuming multipart responses. HttpClient produces multipart requests. An example of a consumer of multipart requests would be the Commons FileUpload. OP is specifically asking for producing multipart responses. I'm not sure if HttpClient supports consuming multipart responses. Multipart responses are pretty rare.

Fred Haslam Over a year ago

HttpClient will consume multi-part responses. I could not find any facility for producing mulit-part responses.

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