Can you find the bug in <div> I do NOT get sample xml data[bookrss.xml]... RSS Client

**Leonidas Savvides** · Aug 14 '10, 09:07 AM

Can you find the bug in <div> I do NOT get sample xml data[bookrss.xml]... RSS Client/Server?
I get
xhrequest.ready State == 4 && xhrequest.statu s == 200 ... 4 & 200 , but no data (local host run)
is this correct
1)var titles = xhrequest.respo nseXML.getEleme ntsByTagName('t itle');
titles[0].firstChild.nod eValue+"</h1>";
2)xml file same folder as .java file in NETBEANS
client

Code:

  <%-- 
    Document   : index
    Created on : Jul 22, 2010, 11:32:20 AM
    Author     : Shop
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
        
        
  <script type="text/javascript">
// getxmlhttprequest.js
function getXMLHttpRequest()
{
 var xhrequest = null;
 if(window.XMLHttpRequest)
 {
 // If IE7, Mozilla, Safari, etc: Use native object
  try
  {
   xhrequest = new XMLHttpRequest();
   return xhrequest;
  }
  catch(exception)
  {
  // OK, just carry on looking
  }
 }
 else
 {

  // ...otherwise, use the ActiveX control for IE5.x and IE6
   var IEControls = ["MSXML2.XMLHttp.5.0","MSXML2.XMLHttp.4.0","MSXML2.XMLHttp.3.0","MSXML2.XMLHttp"];
   for(var i=0; i<IEControls.length; i++)
   {
    try
    {
     xhrequest = new ActiveXObject(IEControls[i]);
     return xhrequest;
    }
    catch(exception)
    {
     // OK, just carry on looking
    }
   }
  // if we got here we didn�t find and matches
  throw new Error("Cannot create an XMLHttpRequest");
 }
}

//processnewsfeed.js
function processRSSFeed()
{
      alert("alert processRSSFeed() "+ xhrequest.readyState + " " + xhrequest.status);
 if(xhrequest.readyState == 4 && xhrequest.status == 200)
 {
       alert("alert readyState/status success processRSSFeed()");
  var titles = xhrequest.responseXML.getElementsByTagName('title');
  var links = xhrequest.responseXML.getElementsByTagName('link');
  var descriptions = xhrequest.responseXML.getElementsByTagName('description');
  var firstItemTitle = "<h1>"+titles[0].firstChild.nodeValue+"></h1>";
  var firstItemLink = "<h3>"+links[0].firstChild.nodeValue+"</h3>";
  var firstItemDescription = "<h3>"+descriptions[0].firstChild.nodeValue+"</h3>";
  
  intro = firstItemTitle+firstItemLink+firstItemDescription;         
  //alert(links[0].firstChild.nodeValue);
for (var i=1; i<=3; i++)            
{
  var firstItemTitle2 = "<p>"+"<h2>"+titles[i].firstChild.nodeValue+"</h2>";
  var firstItemLink2 = "<h3>"+links[i].firstChild.nodeValue+"</h3>";
  var firstItemDescription2 = "<h3>"+descriptions[i].firstChild.nodeValue+"</h3>"+"</p>";   
  total += firstItemTitle2+firstItemLink2+firstItemDescription2+"";
  
}            
               
  document.getElementById("feed").innerHTML=intro+total;
 }
}      
      
      
function ajaxGetRSS()      
{      
  // no 'var', so this is a global variable!
  alert("alert ajaxGetRSS()");
    xhrequest = null;
    try
    {
     xhrequest = getXMLHttpRequest();
    }
    catch(error)
    {
     document.write("Cannot run Ajax code using this browser");
    }
    if(xhrequest != null)
    {
      xhrequest.onreadystatechange = processRSSFeed;
	  xhrequest.open("POST", "http://localhost:8084/ParsonsWebServicesAjax/rssfeed", true);
      xhrequest.send(null);
    }
}

</script>        
    </head>
    <body>
    <h2>Hello World!</h2>
    <br /><form action="" onsubmit="ajaxGetRSS();">
    <input type="submit" value="Press Appear Data" name="getData" />
    <br /></form>
    <a >click here</a>
    <p>&nbsp;</p>
    <div id="feed"></div>
    </body>
</html>

server

Code:

  /*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */


import java.io.*;
import java.net.*;

import javax.servlet.*;
import javax.servlet.http.*;

/**
 *
 * @author Shop
 */
public class AjaxRSSServlet extends HttpServlet {
   
    /** 
    * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
    * @param request servlet request
    * @param response servlet response
    */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        
        PrintWriter out = null;
        try {
        response.setContentType("text/xml");
        out = response.getWriter();

        File xmlfile = new File("bookrss.xml");
        
        StringBuffer sb = new StringBuffer();
        BufferedReader br = new BufferedReader(new FileReader(xmlfile));
        String s = br.readLine();
        while (s != null)
        {
            sb.append(s.trim());
            s=br.readLine();
            
        }
                System.out.println(sb);
                out.print(sb);
        } catch(IOException e) { 
            e.printStackTrace();
            //return null;
        }
        //return null;
    } 


}

bookrss.xml   // version is correct?

<rss version="0.91"> 
<channel> 
<title>hT</title> 
<link>hL</link> 
<description>hD</description> 
<item> 
<title>hT1</title> 
<link>hL1</link> 
<description>hD1</description> 
</item> 
<item> 
<title>hT2</title> 
<link>hL2</link> 
<description>hD2</description> 
</item> 
<item> 
<title>hT3</title> 
<link>hL3</link> 
<description>hD3</description> 
</item> 
</channel> 
</rss>