How to Implement a SOAP Client in Java using SAAJ?

Working SOAP Client Example

Implementing SOAP clients in Java can be simplified by utilizing the SAAJ framework. This versatile framework enables developers to handle SOAP request and response messages directly, surpassing the functionalities of JAX-WS.

To illustrate the functionality of SAAJ, consider the following web service call:

import javax.xml.soap.*;

public class SOAPClientSAAJ {

    public static void main(String[] args) {
        String soapEndpointUrl = "http://www.webservicex.net/uszip.asmx";
        String soapAction = "http://www.webserviceX.NET/GetInfoByCity";

        callSoapWebService(soapEndpointUrl, soapAction);
    }

    private static void createSoapEnvelope(SOAPMessage soapMessage) throws SOAPException {
        SOAPPart soapPart = soapMessage.getSOAPPart();
        String myNamespace = "myNamespace";
        String myNamespaceURI = "http://www.webserviceX.NET";

        SOAPEnvelope envelope = soapPart.getEnvelope();
        envelope.addNamespaceDeclaration(myNamespace, myNamespaceURI);

        SOAPBody soapBody = envelope.getBody();
        SOAPElement soapBodyElem = soapBody.addChildElement("GetInfoByCity", myNamespace);
        SOAPElement soapBodyElem1 = soapBodyElem.addChildElement("USCity", myNamespace);
        soapBodyElem1.addTextNode("New York");
    }

    private static void callSoapWebService(String soapEndpointUrl, String soapAction) {
        try {
            SOAPConnectionFactory soapConnectionFactory = SOAPConnectionFactory.newInstance();
            SOAPConnection soapConnection = soapConnectionFactory.createConnection();

            SOAPMessage soapResponse = soapConnection.call(createSOAPRequest(soapAction), soapEndpointUrl);
            soapResponse.writeTo(System.out);
            System.out.println();

            soapConnection.close();
        } catch (Exception e) {
            System.err.println("Error sending SOAP Request. Ensure correct endpoint URL and SOAPAction.");
            e.printStackTrace();
        }
    }

    private static SOAPMessage createSOAPRequest(String soapAction) throws Exception {
        MessageFactory messageFactory = MessageFactory.newInstance();
        SOAPMessage soapMessage = messageFactory.createMessage();

        createSoapEnvelope(soapMessage);
        MimeHeaders headers = soapMessage.getMimeHeaders();
        headers.addHeader("SOAPAction", soapAction);
        soapMessage.saveChanges();

        soapMessage.writeTo(System.out);
        System.out.println();

        return soapMessage;
    }

}

This comprehensive example demonstrates a SOAP web service call using SAAJ. Modify the parameters to suit your specific web service requirements, and remember to alter the contents of the createSoapEnvelope() method to customize the SOAP envelope's content.

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