I have a simple servlet which reads in a soap message, parses the
XML payload and attempts to add a single element to the existing
(soap message just read in)soap message. I receive the soap message
(from client) and display the elements to log file - no problem.
However, when I add an element to the soap message and return the
message the change does not take place. It's as if I never changed
the message. Can I modify the soap message I just read? Do I have to
recreate a new message from scratch or is there something I'm missing?
The servlet code is below. Thanks for any help.
SLS
------------------
//
// ModifySoapMsgService.java
//
// This program reads a SOAP message and returns a modify version of
// the same
// message back to the client application (requester).
//
//
// Build Instructions:
// o set classpath= <tomcat path>\common\lib\servlet.jar
// o javac ModifySoapMsgService.java
// o Copy ModifySoapMsgService.class file to
// <your web apps path>\MyWsApps\WEB-INF\classes
// o Call from client application (ModifySoapMsgClient).
//
/* Servlet related packages. */
import javax.servlet.*; // Generic servlet package.
import javax.servlet.http.*; // Web server extensions to encapsulate HTTP
communication.
/* SOAP related packages. */
import javax.xml.soap.MessageFactory;
import javax.xml.soap.SOAPMessage;
import javax.xml.soap.SOAPPart;
import javax.xml.soap.SOAPEnvelope;
import javax.xml.soap.SOAPHeader;
import javax.xml.soap.SOAPBody;
import javax.xml.soap.MimeHeaders;
import javax.xml.soap.SOAPException;
import javax.xml.soap.Name;
import javax.xml.soap.SOAPBodyElement;
import javax.xml.soap.SOAPElement;
/* Other needed packages. */
import java.io.*;
import java.util.Iterator;
public class ModifySoapMsgService extends HttpServlet{
private static MessageFactory myMsgFactory;
/* Create static instance of message factory. */
static{
try {
/* Create a new message factory. */
myMsgFactory = MessageFactory.newInstance();
}catch(SOAPException e){
System.out.println("Caught Exception: " + e.getMessage());
}
}
public void init(ServletConfig servletConfig) throws ServletException{
super.init(servletConfig); // Initialize servlet w/config info
passed by Tomcat.
}
public void doPost(HttpServletRequest request,
HttpServletResponse response) throws IOException,
ServletException{
SOAPMessage mySoapMsg;
System.out.println("\n\nModifySoapMsgSerice.doPost() - Received SOAP
message...");
log("doPost() ...");
try{
InputStream myInputStream = request.getInputStream();
OutputStream myOutputStream = response.getOutputStream();
log("o Reading SOAP message ...");
/* Create SOAP message from SOAP content (sent by client) of
input stream. */
mySoapMsg = myMsgFactory.createMessage(new
MimeHeaders(),myInputStream);
/* Process SOAP message. */
SOAPMessage reply=null;
reply = onMessage(mySoapMsg);
/* Return modified SOAP message. */
System.out.println("ModifySoapMsgSerice.doPost() - Return
results...");
reply.saveChanges();
reply.writeTo(myOutputStream);
myOutputStream.flush();
}catch(Exception e){
throw new ServletException("doPost failed: " + e.getMessage());
}
}
public SOAPMessage onMessage(SOAPMessage inSoapMsg){
SOAPPart mySoapPart;
SOAPEnvelope mySoapEnvelope;
SOAPHeader mySoapHeader;
SOAPBody mySoapBody;
SOAPBodyElement myAppFormElement;
SOAPElement myApplicantElement;
SOAPElement myNameElement;
SOAPElement myAddressElement;
SOAPElement myPhoneNoElement;
SOAPElement myAgeElement;
SOAPElement myBeneficiaryElement;
Iterator myElementIterator; // Create iterator for child
elements.
Name myElementName;
String nsUri = "http://ltree.com/app";;
String nsPrefix = "lt";
ByteArrayOutputStream myByteArray = new ByteArrayOutputStream();
System.out.println("ModifySoapMsgSerice.onMessage() - Processing
SOAP message...");
log("doMessage() ...");
try{
/* Log SOAP message just read in. */
inSoapMsg.writeTo(myByteArray);
log("o inSoapMsg: " + myByteArray.toString());
/* Get SOAP part from message. */
mySoapPart = inSoapMsg.getSOAPPart();
/* Get envelope from SOAP part. */
mySoapEnvelope = mySoapPart.getEnvelope();
/* Get header from SOAP envelope. */
mySoapHeader = mySoapEnvelope.getHeader();
/* Get body from envelope. */
mySoapBody = mySoapEnvelope.getBody();
/*
* Parse message body.
*
* <lt:AppForm term="life" xmlns:lt="http://ltree.com/app";>
* <lt:Applicant>
* <lt:Name>Pat Brown</lt:Name>
* <lt:Address>123 Main St</lt:Address>
* <lt:PhoneNo>123-4567</lt:PhoneNo>
* </lt:Applicant>
* <lt:Beneficiary>Dale Brown</lt:Beneficiary>
* </lt:AppForm>
*/
/* - Get <AppForm> element. */
myElementName =
mySoapEnvelope.createName("AppForm",nsPrefix,nsUri); // Creates element
name.
myElementIterator = mySoapBody.getChildElements(myElementName);
// Get child element iterator.
myAppFormElement = (SOAPBodyElement)myElementIterator.next(); //
Get <AppForm> element.
log("o Read <" + myAppFormElement.getElementName().getLocalName() + ">
element");
/* - Get <Applicant> element of <AppForm>. */
myElementName =
mySoapEnvelope.createName("Applicant",nsPrefix,nsUri);
myElementIterator =
myAppFormElement.getChildElements(myElementName); // Get child element
iterator.
myApplicantElement = (SOAPElement)myElementIterator.next(); //
Get <Applicant> element.
log("o Read <" +
myApplicantElement.getElementName().getLocalName() + ">
element");
/* - Get <Name> element of <Applicant>. */
myElementName =
mySoapEnvelope.createName("Name",nsPrefix,nsUri);
myElementIterator =
myApplicantElement.getChildElements(myElementName); // Get child element
iterator.
myNameElement = (SOAPElement)myElementIterator.next(); // Get
<Name> element.
log("o Read <" + myNameElement.getElementName().getLocalName()
+ ">
element");
log(" - <Name> value: " + myNameElement.getValue());
/* - Get <Address> element of <Applicant>. */
myElementName =
mySoapEnvelope.createName("Address",nsPrefix,nsUri);
myElementIterator =
myApplicantElement.getChildElements(myElementName); // Get child element
iterator.
myAddressElement = (SOAPElement)myElementIterator.next(); // Get
<Address> element.
log("o Read <" +
myAddressElement.getElementName().getLocalName() + ">
element");
log(" - <Address> value: " + myAddressElement.getValue());
/* - Get <PhoneNo> element of <Applicant>. */
myElementName =
mySoapEnvelope.createName("PhoneNo",nsPrefix,nsUri);
myElementIterator =
myApplicantElement.getChildElements(myElementName); // Get child element
iterator.
myPhoneNoElement = (SOAPElement)myElementIterator.next(); // Get
<PhoneNo> element.
log("o Read <" +
myPhoneNoElement.getElementName().getLocalName() + ">
element");
log(" - <PhoneNo> value: " + myPhoneNoElement.getValue());
/* - Get <Beneficiary> element of <AppForm>. */
myElementName =
mySoapEnvelope.createName("Beneficiary",nsPrefix,nsUri);
myElementIterator =
myAppFormElement.getChildElements(myElementName); // Get child element
iterator.
myBeneficiaryElement = (SOAPElement)myElementIterator.next(); //
Get <Beneficiary> element.
log("o Read <" +
myBeneficiaryElement.getElementName().getLocalName() +
"> element");
log(" - <Beneficiary> value: " +
myBeneficiaryElement.getValue());
/*
* Modify message body.
*/
/* - Add <Age> sub-element "<lt:Age>32</lt:Age>" to <Applicant>.
*/
myElementName = mySoapEnvelope.createName("Age",nsPrefix,nsUri);
myAgeElement =
myApplicantElement.addChildElement(myElementName);
myAgeElement.addTextNode("32");
inSoapMsg.saveChanges();
log("o <Age> element: " + myAgeElement.getValue());
myByteArray.reset();
inSoapMsg.writeTo(myByteArray);
log("o inSoapMsg: " + myByteArray.toString());
}catch(Exception e){
System.out.println("Caught Exception: " + e.getMessage());
}
return inSoapMsg;
}
}
