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how to check the entered field exists are not in xml

149 New Member
i m new to xml..in my project..i need to develop xml file..i had done it...i used jsp pages for entering the values in xml file...if i enter the same value which is present in xml file...it should throw an alert that 'Already the name exists'...can anyone help me out..i used DOM for creation of XML file...

Thanks in advance..
Jun 22 '10 #1
13 5047
2,057 Recognized Expert Top Contributor
What is the structure of your xml like? Are these values stored in particular elements? Can you get a list of these elements, eg using some sort of getElementsByTa gName function? or SelectNodes?
Jun 22 '10 #2
149 New Member
here is my XML file...i entered all the values using jsp page..i.e P_Name,M_Status ..etc...if i re-enter the values..it should show me an alert that the name already exists..

Expand|Select|Wrap|Line Numbers
  1. <PD>
  2. <GT>
  3. <GL>
  4. <P_Name>Hello</P_Name>
  5. <M_Status>M</M_Status>
  6. <E_Qualification>B.Tech</E_Qualification>
  7. </GL>
  8. </GT>
  9. </PD>
Thanks in Advance,
Jun 22 '10 #3
149 New Member
i created xml file using DOM...if i enter the values...which are present in xml file...it is not showing any error...it is accepting the value...can anyone suggest me how to check the enter value with existing value...i need help from anyone urgently...

Thanks in advance,
Jun 23 '10 #4
8,658 Recognized Expert Moderator Expert
I would need to see some code to make a sensible statement.
Jun 23 '10 #5
149 New Member
this is my code waiting for the reply..

Expand|Select|Wrap|Line Numbers
  1. package login;
  3. import java.io.*;
  4. import javax.servlet.*;
  5. import javax.servlet.http.*;
  7. import java.io.*;
  8. import org.w3c.dom.*;
  9. import javax.xml.parsers.*;
  10. import javax.xml.transform.*;
  11. import javax.xml.transform.dom.*;
  12. import javax.xml.transform.stream.*;
  14. public class register extends HttpServlet
  15. {
  16.     public void doPost(HttpServletRequest request, HttpServletResponse response)
  17.             throws ServletException, IOException
  18.     {
  19.         response.setContentType("text/html");
  20.         PrintWriter pw = response.getWriter();
  21.         String id = "";
  22.         String name = "";
  23.         String gender = "";
  24.         String qual = "";
  25.         id = request.getParameter("id");
  26.         name = request.getParameter("name");
  27.         gender = request.getParameter("gender");
  28.         qual = request.getParameter("qual");
  29.         try
  30.         {
  31. DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
  32. DocumentBuilder docBuilder = builderFactory.newDocumentBuilder();
  33. java.io.File file = new java.io.File("E:/login.xml");
  34. Document doc = null;
  35. if (file.exists()) {
  36. doc = docBuilder.parse(file);
  37. } else {
  38. doc = docBuilder.newDocument();
  39. Element root = doc.createElement("LOGIN");
  40. doc.appendChild(root);
  41. }
  42. createXmlTree(doc, id, name, gender, qual);
  43. }
  44. catch (Exception e) {
  45. System.out.println(e);
  46. }
  47. }
  49. private void createXmlTree(Document doc, String id, String name, String gender, String qual)
  50. throws Exception {
  51. Node node = doc.getFirstChild();
  52. Node childnode =doc.getChildNodes().item(1);
  53. Element child = doc.createElement("LIST");
  54. Element subchild = doc.createElement("GENERAL");
  55. // adding a node after the last child node of the specified node.
  56. node.appendChild(child);
  57. child.appendChild(subchild);
  59. Element child1 = doc.createElement("ID");
  60. subchild.appendChild(child1);
  61. Text text = doc.createTextNode(id);
  62. child1.appendChild(text);
  64. Element element = doc.createElement("NAME");
  65. subchild.appendChild(element);
  66. Text text1 = doc.createTextNode(name);
  67. element.appendChild(text1);
  69. Element element1 = doc.createElement("GENDER");
  70. subchild.appendChild(element1);
  71. Text text2 = doc.createTextNode(gender);
  72. element1.appendChild(text2);
  74. Element element2 = doc.createElement("QUAL");
  75. subchild.appendChild(element2);
  76. Text text3 = doc.createTextNode(qual);
  77. element2.appendChild(text3);
  79. // TransformerFactory instance is used to create Transformer objects.
  80.         TransformerFactory factory = TransformerFactory.newInstance();
  81.         Transformer transformer = factory.newTransformer();
  82.         transformer.setOutputProperty(OutputKeys.INDENT, "yes");
  83.         // create string from xml tree
  84.         StringWriter sw = new StringWriter();
  85.         StreamResult result = new StreamResult(sw);
  86.         DOMSource source = new DOMSource(doc);
  87.         transformer.transform(source, result);
  88.         String xmlString = sw.toString();
  90.         File file = new File("E:/login.xml");
  91.         BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(
  92.                 new FileOutputStream(file)));
  93.         bw.write(xmlString);
  94.         bw.flush();
  95.         bw.close();
  97.     }
  98. }
this is my code..can u chk it nd do me the needful..

Thanks in advance,
Jun 23 '10 #6
2,057 Recognized Expert Top Contributor
"...if i enter the same value"
How exactly are you entering these values?

What type of DOM?

It looks like you can just search your P_Name nodes every time you make an entry.
Jun 23 '10 #7
2,057 Recognized Expert Top Contributor
As you add the nodes, create a vector to hold the already used values. When you try to add new values, compare against the values in the vector.
Jun 23 '10 #8
149 New Member
if i enter the 'P_NAME' value as 'Hello' again it is taking ...how to solve the prob.

Jun 24 '10 #9
2,057 Recognized Expert Top Contributor
Did you try what we suggested? Please show us the code for your try.
Jun 24 '10 #10

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