How I can transform XML to Java-tree-structure?

I would like to transform XML-document to java-tree-s开发者_开发技巧tructure, but I do not know what is a java-tree-structure? For example, JTree or another? is it exists any library?

You could use an XML DOM tree expressed in Java. An XML parser will give it to you straight away.

If your XML conforms to a specific schema (and you have an XSD file for it), you can use JAXB to convert the XSD into a bunch of Java classes for conveniently manipulating the data.

You can populate a JTree with the SAXTreeBuilder construct in import org.xml.sax. Something like (NOTE: I didn't write the code below)

/*
  Java, XML, and Web Services Bible
  Mike Jasnowski
  ISBN: 0-7645-4847-6
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Event.*;
import java.io.*;
import javax.swing.tree.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import org.apache.xerces.parsers.*;

public class XMLTreeView {

       private SAXTreeBuilder saxTree = null;
       private static String file = "";

       public static void main(String args[]){
              JFrame frame = new JFrame("XMLTreeView: [ games.xml ]");
              frame.setSize(400,400);

              frame.addWindowListener(new WindowAdapter(){
                   public void windowClosing(WindowEvent ev){
                       System.exit(0);
                   }
              });
              file = "games.xml";
              new XMLTreeView(frame);
       }

       public XMLTreeView(JFrame frame){ 
              frame.getContentPane().setLayout(new BorderLayout());  
              DefaultMutableTreeNode top = new DefaultMutableTreeNode(file);
//              DefaultMutableTreeNode top = new DefaultMutableTreeNode("XML Document"); 

              saxTree = new SAXTreeBuilder(top); 

              try {             
              SAXParser saxParser = new SAXParser();
              saxParser.setContentHandler(saxTree);
              saxParser.parse(new InputSource(new FileInputStream(file)));
              }catch(Exception ex){
                 top.add(new DefaultMutableTreeNode(ex.getMessage()));
              }
              JTree tree = new JTree(saxTree.getTree()); 
              JScrollPane scrollPane = new JScrollPane(tree);

              frame.getContentPane().add("Center",scrollPane);                                           
              frame.setVisible(true);       

        } 


}
class SAXTreeBuilder extends DefaultHandler{

       private DefaultMutableTreeNode currentNode = null;
       private DefaultMutableTreeNode previousNode = null;
       private DefaultMutableTreeNode rootNode = null;

       public SAXTreeBuilder(DefaultMutableTreeNode root){
              rootNode = root;
       }
       public void startDocument(){
              currentNode = rootNode;
       }
       public void endDocument(){
       }
       public void characters(char[] data,int start,int end){
              String str = new String(data,start,end);              
              if (!str.equals("") && Character.isLetter(str.charAt(0)))
                  currentNode.add(new DefaultMutableTreeNode(str));           
       }
       public void startElement(String uri,String qName,String lName,Attributes atts){
              previousNode = currentNode;
              currentNode = new DefaultMutableTreeNode(lName);
              // Add attributes as child nodes //
              attachAttributeList(currentNode,atts);
              previousNode.add(currentNode);              
       }
       public void endElement(String uri,String qName,String lName){
              if (currentNode.getUserObject().equals(lName))
                  currentNode = (DefaultMutableTreeNode)currentNode.getParent();              
       }
       public DefaultMutableTreeNode getTree(){
              return rootNode;
       }

       private void attachAttributeList(DefaultMutableTreeNode node,Attributes atts){
               for (int i=0;i<atts.getLength();i++){
                    String name = atts.getLocalName(i);
                    String value = atts.getValue(name);
                    node.add(new DefaultMutableTreeNode(name + " = " + value));
               }
       }

}