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WebServices- JAX-WS RPC Style

JAX-WS RPC Style

  1. RPC style web services use method name and parameters to generate XML structure.

  2. The generated WSDL is difficult to be validated against schema.

  3. In RPC style, SOAP message is sent as many elements.

  4. RPC style message is tightly coupled.

  5. In RPC style, SOAP message keeps the operation name.

  6. In RPC style, parameters are sent as discrete values.

Steps to create JAX-WS RPC Style Example

1. JAX-WS Web Service End Point files

  1. Create a Web Service Endpoint Interface with @SOAPBinding(style = Style.RPC)

  2. Create a Web Service Endpoint Implementation

  3. Create an Endpoint Publisher

  4. Test generated WSDL. Ex: http://localhost:8080/ws/hello?wsdl

2. Web Service Client files

Java Web Service Client

  • In general words, -web service endpoint” is a service which published outside for user to access;

  • where -web service client” is the party who access the published service.

Example : Hello World using JAX-WS RPC Style

C:\Users\kaveti_s\Desktop\temp.png

1. JAX-WS Web Service End Point files

*************************************************
1. Create a Web Service Endpoint Interface
*************************************************
package endpoint;
import javax.jws.WebMethod;  
import javax.jws.WebService;  
import javax.jws.soap.SOAPBinding;  
import javax.jws.soap.SOAPBinding.Style;  
//Service Endpoint Interface  
@WebService  
@SOAPBinding(style = Style.RPC)  
public interface HelloWorld{  
 @WebMethod 
 String getHelloWorldMsg(String msg);  
}  


*************************************************
2. Create a Web Service Endpoint Implementation
*************************************************
package endpoint;
import javax.jws.WebService;  
//Service Implementation  
@WebService(endpointInterface = "endpoint.HelloWorld")  
public class HelloWorldImpl implements HelloWorld{
	@Override
	public String getHelloWorldMsg(String msg) {
 // TODO Auto-generated method stub
 return "Your Message from WebService is : "+msg;
	}     
}  


********************************************
3. Create an Endpoint Publisher
********************************************
package endpoint;
import javax.xml.ws.Endpoint;  
//Endpoint publisher  
public class HelloWorldPublisher{  
    public static void main(String[] args) {  
       Endpoint.publish("http://localhost:7777/ws/hello", new HelloWorldImpl());  
       System.out.println("WSDL Published !!");
        }  
}

4. Test generated WSDL

Run HelloWorldPublisher as Java Application & access url: http://localhost:7777/ws/hello?wsdl

http://endpoint/” uses package name of Service endpoint publisher

the main components of WSDL documents are as below. C:\Users\kaveti_s\Desktop\temp.png

WSDL Explanation

1.first Message part contains service method name & parameter list

<message name="getHelloWorldMsg">
    <part name="arg0" type="xsd:string"/>
</message>

2.Second Meaage part contains autogenerated Response method & return type

<message name="getHelloWorldMsgResponse">
    <part name="return" type="xsd:string"/>
</message>

3.PortType information is about ServiceEndpoint interface & input,output action urls

<portType name="HelloWorld">
<operation name="getHelloWorldMsg">
<input message="tns:getHelloWorldMsg" wsam:Action="http://endpoint/HelloWorld/getHelloWorldMsgRequest"/>
<output message="tns:getHelloWorldMsgResponse" wsam:Action="http://endpoint/HelloWorld/getHelloWorldMsgResponse"/>
</operation>
</portType>

Here http://endpoint it will take package name as automatically if we won’t provide anything

4.Binding will generate automatically by taking RPC Style/ Document Style

5.Service tag contains service details & WSDL document location

2. Web Service Client file

Follow below steps to write Webservice client

  1. Create URL object by passing WSDL document location 
    URL url = new URL("http://localhost:7777/ws/hello?wsdl");
  2. Create QName by passing service URI, Service name as arguments 
    QName qname = new QName("http://endpoint/", "HelloWorldImplService");
  3. Create Service Object by calling create (-,-) by passing URL,QName as arguments. Service objects provide the client view of a Web service. ports available on a service can be enumerated using the getPorts method 
    Service service  = Service.create(url, qname);  
HelloWorld hello = service.getPort(HelloWorld.class);

package client;
import java.net.URL;  
import javax.xml.namespace.QName;  
import javax.xml.ws.Service;

import endpoint.HelloWorld;  
public class HelloWorldClient{  
    public static void main(String[] args) throws Exception {  
    URL url = new URL("http://localhost:7777/ws/hello?wsdl");  
   
        //1st argument service URI, refer to wsdl document above  
        //2nd argument is service name, refer to wsdl document above  
        QName qname = new QName("http://endpoint/", "HelloWorldImplService");  
       Service service = Service.create(url, qname);  
       HelloWorld hello = service.getPort(HelloWorld.class);  
       System.out.println(hello.getHelloWorldMsg("Hello, from Client"));  
    }  
}

By running Clinet application we will get output as below

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