Chunked web service response

Question

can you please provide me with an example on how to read a chuncked response from a web service in Android

thanks

Edit: I'm try to call a soap web service, that replies to me with a base64 encoded string representing an image

here's the code:

String SOAP_ACTION = "service soap action";
         try {
            URL u = new URL("server url");
            URLConnection uc = u.openConnection();
            HttpURLConnection connection = (HttpURLConnection) uc;
            connection.setDoOutput(true);
               connection.setDoInput(true);
               connection.setRequestProperty("SOAPAction", SOAP_ACTION);
               connection.setRequestMethod("POST");
               connection.setRequestProperty("Content-type", "text/xml; charset=utf-8");
String xmldata="soap request envelope";
//send the request
               OutputStream out = connection.getOutputStream();

                  Writer wout = new OutputStreamWriter(out);

                  wout.write(xmldata);

                  wout.flush();

                  wout.close();

                  BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getInputStream()));



                    String result;
                    StringBuilder builder=new StringBuilder();
                            //read response
                    while ((result=rd.readLine()) != null) {
                        builder.append(result);
                    }

Show your code. How are you already doing it and what problems you are having? — Olegas, Mar 30 '11 at 09:56

score 1 · Answer 1 · edited Jun 20 '20 at 09:12

Preachy Answers:

You should really use a SOAP library rather than trying to re-invent the wheel: How to call a SOAP web service on Android
If possible use a REST service rather than SOAP since SOAP is not suited for mobile platforms: http://javatheelixir.blogspot.com/2009/12/soap-vs-rest-in-service-layer-for.html

Practical Answer:

Problem:

It seems you are only getting the first chunk of the response.

Possible solutions

Try write(int c) instead of write(String str). Then ignore \r and \n characters.
Use read() in a loop instead of readLine().

Note to questioner: Apologies for leaving in the Preachy answers. I am sure that you have considered those options. But it will help people who are able to use a SOAP library. If you have decided not to use a SOAP library for a specific reason please put it in the comments for the benifit of others.

score 0 · Accepted Answer · answered Mar 30 '11 at 10:21

0

Try to use more generalized classes, such as DefaultHttpClient and HttpPost to handle HTTP-interaction in a more higher level.

answered Mar 30 '11 at 10:21

Olegas

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What you are getting? Response body with "chunk" spliters? Can you show it? – Olegas Mar 30 '11 at 11:09
No I'm getting incomplete response body, the response is a soap response. something like this ?xml version="1.0" encoding="utf-8"?>iVBOR and the closing tags are missing – Mina Wissa Mar 30 '11 at 11:25
Is DefaultHttpClient+HttpPost giving the same result? – Olegas Mar 30 '11 at 11:49
I think you are already checked it thousand times, but... is your service returning a correct result? Can you emulate a call (using Fiddler or smth else) and get a valid response? – Olegas Mar 30 '11 at 12:01
Yes, I downloaded a web service client app. tested the service, the response is correct, but when called from android app it returns an incomplete response – Mina Wissa Mar 30 '11 at 12:07

score 0 · Answer 3 · answered Apr 05 '11 at 19:33

You do not want to use the urlconnection class. You'll want to use the httpclient bundled with android like follows.

HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet("http://something.com/something");
HttpResponse response = client.execute();

int code = response.getStatusLine().getStatusCode();
if(code == 200){
   InputStream is = response.getEntity().getContent();

   //Now parse the xml coming back
   SAXParserFactory spf = SAXParserFactory.newInstance();
   SAXParser sp = spf.newSAXParser();

   XMLReader xr = sp.getXMLReader();
   YourParser parser = new YourParser();

   xr.setContentHandler(parser);

   xr.parse(new InputSource(is));
}

You should simply need to create your xml parser to parse your objects. Hope this helps.

Chunked web service response

3 Answers3

Preachy Answers:

Practical Answer:

Problem:

Possible solutions