problem in modification of the value in xml file

[madhuri kunchala]

hi,
i developed Xml File using DOM..if user enter the values for modifcation it is modifying at the end of Xml file..but i need is what ever value the user enters it should search that value in Xml file and do modifications can any one help me out..here is my code..

modify.jsp

   


<td><font color="#800000"> </font><font color="#800000"><b>Pack Name</b></font><font color="#800000" size=""> </font></td>
                        <td><input name="packName" type="text" id="packName"> </td>
 

if user enters the 'Pack Name'..in the modify.jsp form..it goes to 'modify.java'..here is the code...can anyone check the code and help me out..

modify.java

 

package glogin;
 
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
import java.io.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;
 
public class gupdate extends HttpServlet {
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter pw = response.getWriter();
        String id = "";
        String act = "";
        String deact = "";
        String shrt = "";
        @SuppressWarnings("unused")
        String act1 = "";
 
        id = request.getParameter("id");
        act = request.getParameter("act");
        deact = request.getParameter("deact");
        shrt = request.getParameter("shrt");
 
        try {
            DocumentBuilderFactory builderFactory = DocumentBuilderFactory
                    .newInstance();
            DocumentBuilder docBuilder = builderFactory.newDocumentBuilder();
            java.io.File file = new java.io.File("E:/xgprs/xmlgprs/login.xml");
            Document doc = null;
            if (file.exists()) {
                doc = docBuilder.parse(file);
            } else {
                doc = docBuilder.newDocument();
                Element root = doc.createElement("PACKS");
                doc.appendChild(root);
            }
            // creating a new instance of a DOM to build a DOM tree.
            // Document doc = docBuilder.newDocument();
            createXmlTree(doc, id, act, deact, shrt);
            pw.println("<b>Xml File Updated Successfully</b>");
        } catch (Exception e) {
            System.out.println(e);
        }
    }
 
    private void createXmlTree(Document doc, String id, String act,
            String deact, String shrt) throws Exception {
        // This method creates an element node
        Node node = doc.getFirstChild();
        System.out.println("doc.getChildNodes( "
                + node.getChildNodes().getLength());
        NodeList list = doc.getElementsByTagName("ACT_STATUS");
        NodeList list1 = doc.getElementsByTagName("GENERAL");
        Node usernode = null;
 
        for (int j = 0; j < list1.getLength(); j++) {
            usernode = list1.item(j);
 
            NodeList usernodeList = usernode.getChildNodes();
            for (int i = 0; i < usernodeList.getLength(); i++) {
                Node userNodeSub = usernodeList.item(i);
 
                if (userNodeSub.getNodeName().equalsIgnoreCase("PACK_NAME")) {
                    userNodeSub.setTextContent(id);
                } else if (userNodeSub.getNodeName().equalsIgnoreCase(
                        "ACT_STATUS")) {
                    userNodeSub.setTextContent(act);
                } else if (userNodeSub.getNodeName().equalsIgnoreCase(
                        "DEACT_STATUS")) {
                    userNodeSub.setTextContent(deact);
                } else if (userNodeSub.getNodeName().equalsIgnoreCase(
                        "SHORT_CODE")) {
                    userNodeSub.setTextContent(shrt);
 
                }
            }
        }
 
        // Element root = doc.createElement("User");
        // adding a node after the last child node of the specified node.
        // node.appendChild(root);
        // Element child1 = doc.createElement("UserId");
        // root.appendChild(child1);
        // Text text = doc.createTextNode(userid);
        // child1.appendChild(text);
        // Element element = doc.createElement("Password");
        // root.appendChild(element);
        // Text text1 = doc.createTextNode(password);
        // element.appendChild(text1);
        // TransformerFactory instance is used to create Transformer objects.
        TransformerFactory factory = TransformerFactory.newInstance();
        Transformer transformer = factory.newTransformer();
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        // create string from xml tree
        StringWriter sw = new StringWriter();
        StreamResult result = new StreamResult(sw);
        DOMSource source = new DOMSource(doc);
        transformer.transform(source, result);
        String xmlString = sw.toString();
 
        File file = new File("E:/xgprs/xmlgprs/login.xml");
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(
                new FileOutputStream(file)));
        bw.write(xmlString);
        bw.flush();
        bw.close();
 
    }
}
 

waiting for the reply,
madhu.

[William Brogden]

If this was my problem I would put System.out.println statements at every point where the DOM is supposed to be modified, showing the value being modified.

Bill