asked on

add a new node to an existing xml file--urgent

public static void write(String out_put_file,String s_comment,String root, String s_id, String infor)
{
//create dom document
Document doc = createDomDocument();

//add root
Element element = doc.createElement(root);
doc.appendChild(element);

//add comment at the beginning of the document
Comment comment = doc.createComment(s_comment);
element.getParentNode().insertBefore(comment, element);

//add nodes to dom file
doc = addNode(doc,element, s_id, infor);


//write the dom to an xml outFile
writeXmlFile(doc, out_put_file);
}

the method above is used to create a new xml file and add one node, but after xml file is created, I need add a node to this existed xml file, so I need a method like:

void add(String file_name, String comments, String root_name, String id, String infor)
how to do it in java?

thanks

ASKER CERTIFIED SOLUTION

radarsh

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SOLUTION

radarsh

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ASKER

thanks radarsh:

Document doc = null;
Element element = null;
if(file_existed==false)
{
doc= createDomDocument();

element = addRoot("ROOT",doc);
addComment("testing",doc);
file_existed = true;

}
addNode(doc,element,s_id, infor);

writeXmlFile(doc, "testing.xml");

there is anything wrong, it doesn't work

keepworking

ASKER

static Document createDomDocument()
      {
            try
            {
                  DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
                  Document doc = builder.newDocument();
                  return doc;
            }
            catch (ParserConfigurationException e)
            {
       }
       return null;
      }

      public static Element addRoot (String s_root, Document doc)
      {
            try
            {
                  Element element = doc.createElement(s_root);
                  doc.appendChild(element);
                  return element;
            }
            catch (DOMException e)
            {
            }

            return null;

      }

//add comment to dom
      public static void addComment (String s_comment, Document doc)
      {
            //add comment at the beginning of the document
            Element element = doc.getDocumentElement();
       Comment comment = doc.createComment(s_comment);
       element.getParentNode().insertBefore(comment, element);
      }


      public static Document addNode(Document doc, Element element, String s_id, String infor)
      {
            try
            {

                  // Insert the Record element node
              Element element_Record = doc.createElement("RECORD");
              element.appendChild(element_Record);

              Element element_ID = doc.createElement("ID");
              element_Record.appendChild(element_ID);

              Element element_String = doc.createElement("INFORMATION");
              element_Record.appendChild(element_String);

              element_ID.appendChild(doc.createTextNode(s_id));
              element_String.appendChild(doc.createTextNode(infor));

            }
            catch (DOMException e){
            }

            return doc;

      }

SOLUTION

mukundha_expert

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ASKER

Mukundh:

" it will again overwrite the file given as input to the new XML. " means by your method, you will get a new xml file everytime, right?

what I need is:

there is a xml file, with one node, I need add one more node to this xml file, your method can do that?

thanks

SOLUTION