该程序主要是对XML文档进行解析
package com.corejava.serialClone;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTree;
import javax.swing.SwingWorker;
import javax.swing.event.TreeModelListener;
import javax.swing.filechooser.FileFilter;
import javax.swing.table.AbstractTableModel;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.CDATASection;
import org.w3c.dom.CharacterData;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
/**
* This program displays an XML document as a tree.
*
* @author root 2014-09-29
*/
public class TreeViewer {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
JFrame frame = new DOMTreeFrame();
frame.setTitle("TreeViewer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* This frame contains a tree that displays the contents of an XML document.
*
* @author root
*
*/
class DOMTreeFrame extends JFrame {
private static final int DEFAULT_WIDTH = 400;
private static final int DEFAULT_HEIGHT = 400;
private DocumentBuilder builder;
public DOMTreeFrame() {
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
JMenu fileMenu = new JMenu("file");
JMenuItem openMenu = new JMenuItem("open");
openMenu.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
openFile();
}
});
fileMenu.add(openMenu);
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
System.exit(0);
}
});
fileMenu.add(exitItem);
JMenuBar menuBar = new JMenuBar();
menuBar.add(fileMenu);
setJMenuBar(menuBar);
}
/*
* Open a file and load the document
*/
public void openFile() {
// TODO Auto-generated method stub
JFileChooser choose = new JFileChooser();
choose.setCurrentDirectory(new File("dom"));
choose.setFileFilter(new FileFilter() {
@Override
public String getDescription() {
// TODO Auto-generated method stub
return "XML files";
}
@Override
public boolean accept(File f) {
// TODO Auto-generated method stub
return f.isDirectory()
|| f.getName().toLowerCase().endsWith(".xml");
}
});
int r = choose.showOpenDialog(this);
if (r != JFileChooser.APPROVE_OPTION)
return;
final File file = choose.getSelectedFile();
new SwingWorker<Document, Void>() {
@Override
protected Document doInBackground() throws Exception {
// TODO Auto-generated method stub
if (builder == null) {
DocumentBuilderFactory factory = DocumentBuilderFactory
.newInstance();
builder = factory.newDocumentBuilder();
}
return builder.parse(file);
}
protected void done() {
try {
Document doc = get();
JTree tree = new JTree(new DOMTreeModel(doc));
tree.setCellRenderer(new DOMTreeCellRenderer());
setContentPane(new JScrollPane(tree));
validate();
} catch (Exception e) {
// TODO: handle exception
JOptionPane.showMessageDialog(DOMTreeFrame.this, e);
}
}
}.execute();
}
}
/**
*
* @author root
*
*/
class DOMTreeModel implements TreeModel {
private Document doc;
public DOMTreeModel(Document doc) {
this.doc = doc;
}
@Override
public Object getRoot() {
// TODO Auto-generated method stub
return doc.getDocumentElement();
}
@Override
public Object getChild(Object parent, int index) {
// TODO Auto-generated method stub
Node node = (Node) parent;
NodeList list = node.getChildNodes();
return list.item(index);
}
@Override
public int getChildCount(Object parent) {
// TODO Auto-generated method stub
Node node = (Node) parent;
NodeList list = node.getChildNodes();
return list.getLength();
}
@Override
public boolean isLeaf(Object node) {
// TODO Auto-generated method stub
return getChildCount(node) == 0;
}
@Override
public void valueForPathChanged(TreePath path, Object newValue) {
// TODO Auto-generated method stub
}
@Override
public int getIndexOfChild(Object parent, Object child) {
// TODO Auto-generated method stub
Node node = (Node) parent;
NodeList list = node.getChildNodes();
for (int i = 0; i < list.getLength(); i++)
if (getChild(node, i) == child)
return i;
return -1;
}
@Override
public void addTreeModelListener(TreeModelListener l) {
// TODO Auto-generated method stub
}
@Override
public void removeTreeModelListener(TreeModelListener l) {
// TODO Auto-generated method stub
}
}
/*
* This class renders as XML node.
*/
class DOMTreeCellRenderer extends DefaultTreeCellRenderer {
public Component getTreeCellRenderComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row,
boolean hasFocus) {
Node node = (Node) value;
if (node instanceof Element)
return elementPanel((Element) node);
super.getTreeCellRendererComponent(tree, value, selected, expanded,
leaf, row, hasFocus);
if (node instanceof CharacterData)
setText(characterString((CharacterData) node));
else
setText(node.getClass() + ": " + node.toString());
return this;
}
public static JPanel elementPanel(Element e) {
JPanel panel = new JPanel();
panel.add(new JLabel("Element: " + e.getTagName()));
final NamedNodeMap map = e.getAttributes();
panel.add(new JTable(new AbstractTableModel() {
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
// TODO Auto-generated method stub
return columnIndex == 0 ? map.item(rowIndex).getNodeName()
: map.item(columnIndex).getNodeValue();
}
@Override
public int getRowCount() {
// TODO Auto-generated method stub
return map.getLength();
}
@Override
public int getColumnCount() {
// TODO Auto-generated method stub
return 2;
}
}));
return panel;
}
public static String characterString(CharacterData node) {
StringBuilder builder = new StringBuilder(node.getData());
for (int i = 0; i < builder.length(); i++) {
if (builder.charAt(i) == '\r') {
builder.replace(i, i + 1, "\r");
i++;
} else if (builder.charAt(i) == '\n') {
builder.replace(i, i + 1, "\n");
i++;
} else if (builder.charAt(i) == '\t') {
builder.replace(i, i + 1, "\t");
i++;
}
}
if (node instanceof CDATASection)
builder.insert(0, "CDATASection:");
else if (node instanceof Text)
builder.insert(0, "Text:");
else if (node instanceof Comment)
builder.insert(0, "Comment:");
return builder.toString();
}
}
实现如图所示
