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import java.awt.Component;
import java.awt.Toolkit;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.stream.StreamSupport;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextPane;
import javax.swing.JTree;
import javax.swing.filechooser.FileFilter;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.events.XMLEvent;
public class XMLStAXDemo {
public static void main(String[] args) {
JFrame frame = new JFrame("XML/StAX/JTree");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTree jtree = new JTree(new DefaultTreeModel(new DefaultMutableTreeNode()));
jtree.setRootVisible(false);
jtree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
JTextPane textpane = new JTextPane();
textpane.setEditable(false);
JSplitPane panel = new JSplitPane();
panel.setLeftComponent(new JScrollPane(jtree));
panel.setRightComponent(new JScrollPane(textpane));
jtree.addTreeSelectionListener(e-> treeSelection(jtree, textpane));
frame.add(panel);
JMenuBar menubar = new JMenuBar();
JMenu menu = new JMenu("Fichier");
JMenuItem menuItem = new JMenuItem("Charger");
menuItem.addActionListener(e-> load(frame, jtree));
menu.add(menuItem);
menubar.add(menu);
frame.setJMenuBar(menubar);
frame.setSize(Toolkit.getDefaultToolkit().getScreenSize());
frame.setLocationRelativeTo(null);
frame.setVisible(true);
panel.setDividerLocation(0.33d);
}
private static void treeSelection(JTree tree, JTextPane textpane) {
TreePath path = tree.getSelectionPath();
if ( path==null ) {
textpane.setText("");
}
else {
DefaultMutableTreeNode treenode = (DefaultMutableTreeNode) path.getLastPathComponent();
Node node = (Node) treenode.getUserObject();
if ( node.isText() ) {
textpane.setText(node.getText());
}
else {
textpane.setText("");
}
}
}
private static void load(Component parent, JTree jtree) {
Path path = chooseFile(parent);
if ( path!=null ) {
try {
TreeNode root = new XMLStAXDemo().load(path);
jtree.setModel(new DefaultTreeModel(root));
} catch (XMLStreamException | IOException e) {
JOptionPane.showMessageDialog(jtree, "Impossible de lire le fichier", "Erreur", JOptionPane.ERROR_MESSAGE);
}
}
}
public TreeNode load(Path path) throws XMLStreamException, IOException {
try( InputStream inputStream = Files.newInputStream(path) ) {
XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
XMLStreamReader xmlReader = xmlInputFactory.createXMLStreamReader(path.getFileName().toString(), inputStream);
try {
DefaultMutableTreeNode root = null;
DefaultMutableTreeNode current = null;
while(xmlReader.hasNext()) {
switch( xmlReader.next() ) {
case XMLEvent.START_ELEMENT:
DefaultMutableTreeNode newNode = new DefaultMutableTreeNode( new Node(xmlReader.getName()));
if ( root == null ) {
root = newNode;
}
if ( current!=null ) {
current.add(newNode);
}
current=newNode;
break;
case XMLEvent.END_ELEMENT:
current = (DefaultMutableTreeNode) current.getParent();
break;
case XMLEvent.CHARACTERS:
// FIXME: gestion preservespace
String text=xmlReader.getText().trim();
if ( !text.isEmpty() ) {
Node childText = getChildText(current);
if ( childText!=null ) {
childText.append(text);
}
else {
current.add(new DefaultMutableTreeNode( new Node(text) ));
}
}
break;
}
}
return root;
}
finally {
xmlReader.close();
}
}
}
private Node getChildText(DefaultMutableTreeNode current) {
int index=current.getChildCount()-1;
if ( index>=0 ) {
DefaultMutableTreeNode treeNode = (DefaultMutableTreeNode) current.getChildAt(index);
Node node = (Node) treeNode.getUserObject();
if ( node.isText() ) {
return node;
}
}
return null;
}
private static Path chooseFile(Component parent) {
JFileChooser filechooser = new JFileChooser();
filechooser.setDialogTitle("Choisir fichier");
filechooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
filechooser.setMultiSelectionEnabled(false);
filechooser.setFileFilter(new FileFilter() {
@Override
public String getDescription() {
return "Fichiers XML (*.xml)";
}
@Override
public boolean accept(File f) {
return f.getName().endsWith(".xml");
}
});
if( filechooser.showOpenDialog(parent)==JFileChooser.APPROVE_OPTION ) {
return filechooser.getSelectedFile().toPath();
}
return null;
}
public static class Node {
private final QName qname;
private String text;
public Node(QName qname) {
this.qname=qname;
this.text=qname.getLocalPart();
}
public void append(String text) {
Arrays.asList(text.split("\n")).stream().map(t->t.trim()).forEach(t-> this.text= (this.text==null?t:this.text + "\n"+ t));
}
public Node(String text) {
this.qname=null;
append(text);
}
public QName getQname() {
return qname;
}
public String getText() {
return text.trim();
}
public boolean isText() {
return qname==null;
}
@Override
public String toString() {
if ( text.contains("\n") ) {
return text.substring(0, text.indexOf("\n")) + "\u2026";
}
return text;
}
}
} |
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