WEBSERVICE USING APACHE AXIS TUTORIAL-2

WEBSERVICE USING APACHE AXIS TUTORIAL-2

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WEBSERVICE USING APACHE AXIS TUTORIAL-2
Accessing ejb-webservice  using  WAP (Wireles-Application Protocol)
R.S.RAMASWAMY ([email protected])

c:\sam> edit ejbaxiswapservlet.java

******************************************

//ejbaxiswapservlet.java

----------------------

import java.net.URL;

import org.apache.axis.client.Service;

import org.apache.axis.client.Call;

import org.apache.axis.encoding.XMLType;

import javax.xml.rpc.ParameterMode;

import javax.xml.namespace.QName;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

public class ejbaxiswapservlet extends HttpServlet

{

    public void doPost (HttpServletRequest request,  

                        HttpServletResponse response)

                 throws ServletException, IOException

    {

      response.setContentType("text/vnd.wap.wml");

        PrintWriter out = response.getWriter();

        String sql = request.getParameter("text1");

        try{

            String url = "http://localhost:8080/axis/services/sqlservice";

            String method = "getdata";

            Service   service = new Service();

 Call     call = (Call) service.createCall();

      call.setTargetEndpointAddress ( url);

      call.setOperationName

             ( new QName("sqlservice",method));

         call.addParameter("sql",XMLType.XSD_STRING,ParameterMode.IN);

    call.setReturnType(XMLType.XSD_STRING);

            System.out.println("Call Ok");

  Object[] params = new Object[] { args[0] };

       System.out.println("Params ok...");

     String s = (String) call.invoke(params);

         System.out.println(s);

      out.println("<p>");

      out.println("ejb with wap<br/>");

      out.println(s);

      out.println("</p>");

      out.println("</card>");

      out.println("</wml>");

        }catch(Exception e)

                { System.out.println(""+e);  }

    }

}

********************************************

Complie and copy  the class file to  tomcat as below.

 

c:\sam> javac ejbaxiswapservlet.java 

copy c:\sam\ejbaxiswapservlet.class  to

     d:\tomcat 4.1\webapps\axis\web-inf\classes

Edit web.xml in 

  d:\tomcat 4.1\webapps\axis\web-inf folder 

      <servlet>

     <servlet-name>

        ejbaxiswapservlet

       </servlet-name>

     <servlet-class>

     ejbaxiswapservlet

     </servlet-class>

     </servlet>

     <servlet-mapping>

<servlet-name>

ejbaxiswapservlet

</servlet-name>

<url-pattern>

     \servlet\ejbaxiswapservlet

 </url-pattern>

     </servlet-mapping>

For accessing servlet, create a wml file in the working folder

and copy the file to

d:\tomcat 4.1\webapps\axis

c:\sam> edit ejbaxiswapservlet.wml

***************************************************

ejbaxiswapservlet.wml

---------------------

<?xml version="1.0"?>

<!DOCTYPE wml PUBLIC

 "-//WAPFORUM//DTD WML 1.1//EN" "http://www.wapforum.org/DTD/wml_1.1.xml">

<wml>

   <card id="card1">

     <p>      

Query? <input type="text"  name="text1"   />  

   <do   type="accept">

   <go  method="post" href="http://localhost:8080/axis/servlet/ejbaxiswapservlet"> 

           <postfield name="text1"  value="$text1"/>

   </go>

   </do>

   </p>            

   </card>

</wml>

*************************************************

Open 'Microsoft Mobile browser'and type the url as

'http://localhost:8080/axis/ejbaxiswapservlet.wml'

Make sure that tomcat is running. Enter sql query in the text box and submit it. we'll get the resultset as per the query. But, WAP is no-longer, the favoured wireless client because of limited functionality. Color graphics, games and animations are expected today. 

J2ME is the best solution for such apps, because,it is platform independent.

We now demonstrate how we can access an ejb-webservice from a j2me wireless client.( continued in axis3-3.htm

                 Visit  http://in.geocities.com/rsramsam

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