jdomexample

XML parsing with JDOM
Using JDOM to parse an XML document (servlet example).

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XML parsing with JDOM

This is an unfinished piece of code that was originally intended to search an XML document for a node. Whilst it's unfinished, it is illustrates how to use the JDOM XML package with a Servlet. JDOM can be found here

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;
import java.util.*;

public class jdomtest extends HttpServlet
{

public Element findElement(Document xmldoc,String nodeName,HttpServletResponse response)
   throws ServletException, IOException
   {
       Element root = xmldoc.getRootElement();

// Traverse the tree
      List rootchildren = root.getChildren();
      return recurse_findElement(rootchildren,nodeName,response);

}

private Element recurse_findElement(List rootchildren,String nodeName,HttpServletResponse response)
   throws ServletException, IOException
   {
      PrintWriter out = response.getWriter();
      Element elcopy = null;

// Cycle through all the child nodes of the root
 for (int i=0;i <= rootchildren.size() -1;i++)
 {
 Element el = (Element) rootchildren.get(i);

// Display element name and value and attribute names/values of the node
 out.println(""+el.getName()+":"+el.getText()+" ");
 List elList = el.getAttributes();
 for (int n=0;n <= elList.size() -1;n++)
 {
 Attribute atrib = (Attribute) elList.get(n);
 out.println(atrib.getName()+":"+atrib.getValue()+",");
 }

String elname = el.getName();

if (elname.equals(nodeName))
         {
             elcopy = el;
         }

// If the node has children, call this method with the node
 if (el.hasChildren())
 {
 List childnodes = el.getChildren();
 recurse_findElement(childnodes,nodeName,response);
 }
 out.println(" ");

}
      return elcopy;

}

public void doGet(HttpServletRequest request,HttpServletResponse response)
   throws ServletException, IOException
   {
      response.setContentType("text/html");

try {
            // Build the document with SAX and Xerces, no validation 
            SAXBuilder builder = new SAXBuilder(false);

// Get the XML from a url
            String strUrl = request.getParameter("url");
            Document doc = builder.build(strUrl);

PrintWriter out = response.getWriter();

// Show the xml doc if the page is called with "showxml"
 if (request.getParameter("showxml") != null)
 {
 XMLOutputter fmt = new XMLOutputter();
 fmt.output(doc, out);
 } else{
 // Information about the XML document
 out.println("<html><body>");
 out.println("File: "+strUrl+" ");

// Root info
 Element root = doc.getRootElement();
 out.println("Root element:"+root.getName()+" ");

//If called with getnodeinfo, show all the nodes         
               if (request.getParameter("getnodeinfo") != null)
               {
               Element f = findElement(doc,"mkdir",response);
               }
            }

} catch (JDOMException e) {
            PrintWriter out = response.getWriter();
            out.println(e.getMessage());
        }

}