booktitleserviceviaenhydra.java

java web services how to program

// Fig. 14.15: BookTitleServiceViaEnhydra.java.
// BookTitleServiceViaEnhydra invokes the Book Titles
// Web service on behalf of BookTitleMIDlet.
package com.deitel.jws1.j2me.client;

// import J2ME classes
import java.util.*;

// import Enhydra XML and SOAP packages
import org.ksoap.*;
import org.ksoap.transport.*;

// import Deitel packages
import com.deitel.jws1.services.BookTitles;

public class BookTitleServiceViaEnhydra
   implements BookTitles {

   // URL of Book Titles Web service
   private final static String SERVICE_URL =
      "http://localhost:6060/BookTitlesImpl/";

   // namespace that Book Titles Web service uses
   private final static String NAMESPACE =
      "urn:com.deitel.jws1.services.BookTitlesImpl";

   // invoke Book Titles Web service
   public String[] getBookTitles()
   {
      // invoke Web service and convert result to String array
      try {
         String titles[] = null;

         // establish HTTP connection to Web-service URL
         HttpTransport httpTransport = 
            new HttpTransport( SERVICE_URL, "" );

         // create SOAP request to invoke Book Titles service
         SoapObject requestMessage = 
            new SoapObject( NAMESPACE, "getBookTitles" );

         // invoke Book Titles Web service
         Vector response = 
            ( Vector ) httpTransport.call( requestMessage );

         titles = new String[ response.size() ];

         Enumeration iterator = response.elements();
         int i = 0;

         // convert response to String array
         while ( iterator.hasMoreElements() )
            titles[ i++ ] = ( String ) iterator.nextElement();

         return titles;
      }

      // handle exception in sending or receiving SOAP message
      catch( java.io.IOException ioException ) {
         ioException.printStackTrace();
         return null;
      }

      // handle exception in populating bookTitles String array
      catch( ClassCastException exception ) {
         exception.printStackTrace();
         return null;
      }

   } // end method getBookTitles

} // end class BookTitleServiceViaEnhydra