Thursday, December 30, 2010

Call SOAP webservices without using any SOAP Libraries in ANDROID

AIM : Accessing SOAP wsdl methods without including any third party SOAP libraries (like KSOAP2)
SOLUTION:
The below method will call the SOAP server with soap message and returns the ByteArray of response.
private byte[] callSOAPServer() {

        byte[] result = null;
       
        HttpParams httpParameters = new BasicHttpParams();
        // Set the timeout in milliseconds until a connection is established.
        int timeoutConnection = 15000;
        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
        // Set the default socket timeout (SO_TIMEOUT)
        // in milliseconds which is the timeout for waiting for data.
        int timeoutSocket = 35000;
        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
       
        DefaultHttpClient httpclient = new DefaultHttpClient(httpParameters);

        /*
         * httpclient.getCredentialsProvider().setCredentials( new
         * AuthScope("os.icloud.com", 80, null, "Digest"), new
         * UsernamePasswordCredentials(username, password));
         */
        HttpPost httppost = new HttpPost(SERVER_URL );
        httppost.setHeader("soapaction", SOAP_ACTION);
        httppost.setHeader("Content-Type", "text/xml; charset=utf-8");
   
        System.out.println("executing request" + httppost.getRequestLine());
//now create a soap request message as follows:
        final StringBuffer soap = new StringBuffer();
        soap.append("\n");
        soap.append("");
// this is a sample data..you have create your own required data  BEGIN
        soap.append(" \n");
        soap.append(" \n");
        soap.append("" + body);
        soap.append("
\n");
        soap.append("
\n");

        /* soap.append(body); */
// END of MEssage Body
        soap.append("");
        Log.i("SOAP Request", ""+soap.toString());
// END of full SOAP request  message
        try {
            HttpEntity entity = new StringEntity(soap.toString(),HTTP.UTF_8);
            httppost.setEntity(entity); 
            HttpResponse response = httpclient.execute(httppost);// calling server
            HttpEntity r_entity = response.getEntity();  //get response
            Log.i("Reponse Header", "Begin...");          // response headers
            Log.i("Reponse Header", "StatusLine:"+response.getStatusLine());
            Header[] headers = response.getAllHeaders();
            for(Header h:headers){
                Log.i("Reponse Header",h.getName() + ": " + h.getValue());
            }
            Log.i("Reponse Header", "END...");
            if (r_entity != null) {       
                result = new byte[(int) r_entity.getContentLength()];  // read the output message
                if (r_entity.isStreaming()) {
                    DataInputStream is = new DataInputStream(
                            r_entity.getContent());
                    is.readFully(result);
                }
            }
        } catch (Exception E) {
            Log.i("Exception While Connecting", ""+E.getMessage());
            E.printStackTrace();
        }
       
        httpclient.getConnectionManager().shutdown(); //shut down the connection
        return result;
    }

2)You have to parse the output of above function returned byteArray.
for example .,
byte[] initReqrepsonse = callSOAPServer(soapBodymessage );
 ByteArrayInputStream bais=new ByteArrayInputStream(initReqrepsonse);
// now parse the xml
as
    /** Handling XML */
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();
       
            /** Create handler to handle XML Tags ( extends DefaultHandler ) */
          // ResponseParser  is XML parser class which will parse the XML output.
            ResponseParser myXMLHandler = new ResponseParser();
            xr.setContentHandler(myXMLHandler);
            Log.i("XML data", bais.toString());
            xr.parse(new InputSource(bais));

By this way,you can access Any SOAP webservice methods without using any libraries.
please let me know if any corrections required.

4 comments:

  1. Hi Rama,

    Do you think this is the best approach for Web Services access?

    ReplyDelete
  2. Hello,

    I've copied your code in a new Android project but I get some errors on ResponseParser. Eclipse don't recognize it.

    And what kind of message is the soapBodyMessage?

    Thanks in advance

    ReplyDelete
  3. Thanks a lot, you save my day :)

    ReplyDelete
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