Help regarding how to check the element entered is equal or not in xml file

[madhuri kunchala]

hi,
i had developed xml file using DOM,if i enter the values from front-end i.e., jsp page...an xml file is creating..if i enter the same value in the xml file...it is not showing any error...i used javascript for validation...for eg. my XML file is

<GENERAL>
<NAME>Hello</NAME>
<STATUS>M</STATUS>
<QUAL>B.Tech</QUAL>
</GENERAL>


if i enter 'Hello' in the <NAME> tag it is taking...i dont want that to be appended..it should throw an error 'Already the Name exists'....

Can anyone help me out...waiting for the reply.

Thanks,
madhu.

[Paul Clapham]

Instead of unconditionally adding the element, instead use an if-statement to see if the string is "Hello", and if it is, then throw an exception?

I put a question mark there because you really don't have a specific question. You have a vague description of a system with numerous components and you want to change one of those components in some way (surely not just to exclude the word "Hello"). A specific question would be far more practical. If you have code which you want to change, then posting that code would be useful too.

[madhuri kunchala]

hi,
here with i m sending the code...can you check it..

package login;

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 register extends HttpServlet
{
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
String id = "";
String name = "";
String gender = "";
String qual = "";
id = request.getParameter("id");
name = request.getParameter("name");
gender = request.getParameter("gender");
qual = request.getParameter("qual");
try
{
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = builderFactory.newDocumentBuilder();
java.io.File file = new java.io.File("E:/login.xml");
Document doc = null;
if (file.exists()) {
doc = docBuilder.parse(file);
} else {
doc = docBuilder.newDocument();
Element root = doc.createElement("GENERAL");
doc.appendChild(root);
}
createXmlTree(doc, id, name, gender, qual);
}
catch (Exception e) {
System.out.println(e);
}
}

private void createXmlTree(Document doc, String id, String name, String gender, String qual)
throws Exception {
Node node = doc.getFirstChild();
Node childnode =doc.getChildNodes().item(1);
Element child = doc.createElement("NAME");

// adding a node after the last child node of the specified node.
node.appendChild(child);
child.appendChild(subchild);

Element child1 = doc.createElement("STATUS");
child.appendChild(child1);
Text text = doc.createTextNode(id);
child1.appendChild(text);

Element element = doc.createElement("QUAL");
child.appendChild(element);
Text text1 = doc.createTextNode(name);
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:/login.xml");
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(file)));
bw.write(xmlString);
bw.flush();
bw.close();

}
}

can you suggest me where to do the modifications..

Thanks in advance,
madhu.

[Peter Taucher]

1) UseCodeTags
2) TellTheDetails

You still didn't provide a valid problem description. What is the expected behaviour (in detail) and where does it differ from the encountered behaviour (in detail)? Or simply speaking: whaddayawant?