Mapping Java Types to XML Types

Question

Hi, I have a small doubt in web services,
1)  how a java data type can match with xml data type in wsdl,
2)  how and where the java program can find the matching java
    data type to xml data type and vice versa
3)  whether any mechanism is available for this data conversion?
4)  where can i find that one?
Please advice me
Regards
Marimuthu.N

Answer 1

Hi Marimuthu.N,
My answers for your question, Kindly let me know if you need some more inputs.
+1) how a java data type can match with xml data type in wsdl,+
In SOAP 1.1 you have the following data types which is in XSD(XML Schema Definition), the same data type is also available in Java. For example (string, normalizedstring in xml is available as java.lang.String)
The complete list can be found in the table below.
XSD to Java Mapping.
XSD Type--------------------------------Java Type
base64Binary----------------------------byte[]
hexBinary---------------------------------byte[]
boolean------------------------------------Boolean
byte-----------------------------------------Byte
dateTime----------------------------------java.util.Calendar
date-----------------------------------------java.util.Calendar
time-----------------------------------------java.util.Calendar
decimal------------------------------------java.math.BigDecimal
double-------------------------------------Double
float-----------------------------------------Float
hexBinary---------------------------------byte[]
int--------------------------------------------Int
unsignedShort---------------------------Int
integer--------------------------------------java.math.BigInteger
long------------------------------------------Long
unsignedInt-------------------------------Long
QName-------------------------------------javax.xml.namespace.QName
short----------------------------------------Short
unsignedByte---------------------------Short
string---------------------------------------java.lang.String
anySimpleType-------------------------java.lang.String
+2) how and where the java program can find the matching java+
data type to xml data type and vice versa
Here is my WSDL which has a method getHello --> Pass Input as String --> Get Response as String.
<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions targetNamespace="http://zackria.googlepages.com" xmlns:apachesoap="http://xml.apache.org/xml-soap" xmlns:impl="http://zackria.googlepages.com" xmlns:intf="http://zackria.googlepages.com" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:wsdlsoap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<!--WSDL created by Apache Axis version: 1.4
Built on Apr 22, 2006 (06:55:48 PDT)-->
<wsdl:types>
  <schema elementFormDefault="qualified" targetNamespace="http://zackria.googlepages.com" xmlns="http://www.w3.org/2001/XMLSchema">
   <element name="getHello">
    <complexType>
     <sequence>
      <element name="s" type="xsd:string"/>
     </sequence>
    </complexType>
   </element>
   <element name="getHelloResponse">
    <complexType>
     <sequence>
      <element name="getHelloReturn" type="xsd:string"/>
     </sequence>
    </complexType>
   </element>
  </schema>
</wsdl:types>
   <wsdl:message name="getHelloResponse">
      <wsdl:part element="impl:getHelloResponse" name="parameters"/>
   </wsdl:message>
   <wsdl:message name="getHelloRequest">
      <wsdl:part element="impl:getHello" name="parameters"/>
   </wsdl:message>
   <wsdl:portType name="Test">
      <wsdl:operation name="getHello">
         <wsdl:input message="impl:getHelloRequest" name="getHelloRequest"/>
         <wsdl:output message="impl:getHelloResponse" name="getHelloResponse"/>
      </wsdl:operation>
   </wsdl:portType>
   <wsdl:binding name="TestSoapBinding" type="impl:Test">
      <wsdlsoap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
      <wsdl:operation name="getHello">
         <wsdlsoap:operation soapAction=""/>
         <wsdl:input name="getHelloRequest">
            <wsdlsoap:body use="literal"/>
         </wsdl:input>
         <wsdl:output name="getHelloResponse">
            <wsdlsoap:body use="literal"/>
         </wsdl:output>
      </wsdl:operation>
   </wsdl:binding>
   <wsdl:service name="TestService">
      <wsdl:port binding="impl:TestSoapBinding" name="Test">
         <wsdlsoap:address location="http://localhost:8080/TestWebService/services/Test"/>
      </wsdl:port>
   </wsdl:service>
</wsdl:definitions>I use apache axis for the client side code. I also suggest to start using this to get quickly into SOA(Service Oriented Architecture)
package com.googlepages.zackria;
import org.apache.axis.client.Call;
import org.apache.axis.client.Service;
import javax.xml.namespace.QName;
* TestClient for Webservice
* @author $author$Mohammed Zackria
* @version $Revision$1.00
public class TestClient {
     * main method
     * @param args pass nothing as far now
    public static void main(String[] args) {
        try {
            String endpoint = "http://localhost:8080/TestWebService/services/Test";
            Service service = new Service();
            Call call = (Call) service.createCall();
            call.setTargetEndpointAddress(new java.net.URL(endpoint));
            call.setOperationName(new QName("http://zackria.googlepages.com", "getHello"));
            //String Conversion
            String ret = (String) call.invoke(new Object[] { "Zack" });
            System.out.println("Sent 'Zack', got '" + ret + "'");
        } catch (Exception e) {
            System.err.println(e.toString());
}+3) whether any mechanism is available for this data conversion?+
Check the above code which has the following portion
//String Conversion
String ret = (String) call.invoke(new Object[] { "Zack" });
By default APACHE Axis returns Object Array which can be Casted to your WSDL defined data type.
+4) where can i find that one?+
[Eclipse Webservice|http://www.eclipse.org/webtools/jst/components/ws/1.5/tutorials/BottomUpWebService/BottomUpWebService.html]
Hope this helps out, Kindly Let me know if you need some more or if i have not answered your question.
Regards,
Zack
Edited by: zack on Nov 22, 2008 1:47 PM
Edited by: zack on Nov 22, 2008 1:49 PM