How to retrieve information from XML using servlets

Question

Hi
I have a scenario like this
File-->XI-->J2ee application(HTTP Receiver adapter)
I want to know how XI sends xml file as a query string file name?
What ever may be the case i just need to retrieve the information from Request object and display the same in browser(JSP).How to do that, I am totally confused, please anyone help me!
Code help is highly rewarded.
Thanx

Answer 1

Hi Rajesh!
I have tried your code. But some where i went wrong. Please correct me: I am using NWDS2.0.9
my web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
                         "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
    <display-name>WEB APP</display-name>
    <description>WEB APP description</description>
    <servlet>
        <servlet-name>DisplayRes</servlet-name>
        <servlet-class>com.quinnox.DisplayRes</servlet-class>
    </servlet>
    <servlet-mapping>
          <servlet-name>DisplayRes</servlet-name>
          <url-pattern>/DisplayRes/*</url-pattern>
     </servlet-mapping>
</web-app>
my application.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE application PUBLIC "-//Sun Microsystems, Inc.//DTD J2EE Application 1.3//EN"
                             "http://java.sun.com/dtd/application_1_3.dtd">
<application>
    <display-name>ReceiverEntpr</display-name>
    <description>EAR description</description>
    <module>
        <web>
            <web-uri>HttpReceiver.war</web-uri>
            <context-root>/HttpReceiver</context-root>
        </web>
    </module>
</application>
and my servlet code:
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.Writer;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.xml.sax.EntityResolver;
import org.xml.sax.SAXException;
import com.sun.java_cup.internal.parser;
import com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl;
public class DisplayRes extends HttpServlet {
     public void doGet(HttpServletRequest requset, HttpServletResponse response) throws ServletException, IOException
          doWork(requset, response);
     public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
          doWork(req, resp);
     private void doWork(HttpServletRequest req, HttpServletResponse resp) throws IOException
          String path = null;
          PrintWriter out = null;
          PrintWriter p2=resp.getWriter();     
          try
               resp.setContentType("text/xml");
               out = resp.getWriter();
               out.println("hi");
               path = req.getPathInfo();
               if(req.getContentLength() != -1){
               outputURI(req.getInputStream(), out);
          } catch (IOException ioe) {     return;     
     //private void outputURI(InputStream resultStream, Writer out) {
          private void outputURI(InputStream resultStream, PrintWriter out) {
          if (resultStream == null) {
//             no default file
//            logger.error("No File to return");
          return;
          try {
          DocumentBuilder parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
//            Class clazz = loader.loadClass("org.apache.xerces.jaxp.DocumentBuilderFactoryImpl");
//            DocumentBuilderFactoryImpl factory = (DocumentBuilderFactoryImpl) clazz.newInstance();
//            DocumentBuilder parser = factory.newDocumentBuilder();
          parser.setEntityResolver(new ClassPathEntityResolver());
          printXML(parser.parse(resultStream), out);
          resultStream.close();
          } catch (Exception e) {
//            logger.error("Trying to parse the output " , e);
     //private void printXML(Document document, Writer writer) throws Exception {
          private void printXML(Document document, PrintWriter writer) throws Exception {
          Transformer transformer = TransformerFactory.newInstance().newTransformer();
          Source source = new DOMSource(document);
          Result output = new StreamResult(System.out);
          transformer.transform(source, output);
//             Write as XML so that entity references can be resolved.
          if (writer != null) {
          transformer.transform(source, new StreamResult(writer));
Please tell me how to display in servlet.
If it is better to display in a browser. Please send me the code.
Thanks