Dynamic Web Service Client

In Apache Axis2, the are several ways to write a client for a web service. One approach would be to use WSDL2Java, the code generation tool provided with Axis2 generate a stub for the web service and use that stub to consume the web service. Other option is to write a dynamic client. This is how you can write a dynamic client for a web service.

We will you expose a simple POJO as a web service.

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1. package org.wso2.training;  
2.   
3. public class CalculatorService {  
4.     
5.    public int add (int a, int b) {  
6.        return a + b;  
7.    }  
8.     
9.    public int multiply(int a, int b) {  
10.        return a * b;  
11.    }  
12.     
13. }  

Exposing this as a web service is a matter of 2 lines of code ...

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1. AxisServer axisServer = new AxisServer();  
2. axisServer.deployService(CalculatorService.class.getName());  

Now, the WSDL for this web service will be available at

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1. http://localhost:6060/axis2/services/CalculatorService?wsdl  

Now let's see how we can write a dynamic client for this web service

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1.         //Create a service client for given WSDL service by passing the following four parameters  
2.         //ConfigurationContext - we keep it as null  
3.         //wsdlURL - The URL of the WSDL document to read  
4.         //wsdlServiceName The QName of the WSDL service in the WSDL document   
5.         //portName        The name of the WSDL 1.1 port to create a client for.   
6.           
7.         RPCServiceClient dynamicClient = new RPCServiceClient(null, new URL(  
8.                 "http://localhost:6060/axis2/services/CalculatorService?wsdl"), new QName(  
9.                 "http://training.wso2.org", "CalculatorService"),  
10.                 "CalculatorServiceHttpSoap12Endpoint");  
11.   
12.         // We provide the parameters as an object array and return types as an class array  
13.         Object[] returnArray = dynamicClient.invokeBlocking(new QName("http://training.wso2.org","add"),  
14.                 new Object[] { 1, 2 }, new Class[] { Integer.class });  
15.           
16.         System.out.println("1 + 2 = " + returnArray[0]);  
17.           
18.         returnArray = dynamicClient.invokeBlocking(new QName("http://training.wso2.org","multiply"),  
19.                 new Object[] { 1, 2 }, new Class[] { Integer.class });  
20.           
21.         System.out.println("1 X 2 = " + returnArray[0]);  
22.   
23. .