corejava第8版
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import java.awt.*;
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import java.awt.geom.*;
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import java.io.*;
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import java.util.*;
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import java.awt.event.*;
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import javax.swing.*;
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import javax.xml.parsers.*;
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import javax.xml.stream.*;
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import javax.xml.transform.*;
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import javax.xml.transform.dom.*;
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import javax.xml.transform.stream.*;
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import org.w3c.dom.*;
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/**
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* This program shows how to write an XML file. It saves a file describing a modern drawing in SVG
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* format.
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* @version 1.10 2004-09-04
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* @author Cay Horstmann
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*/
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public class XMLWriteTest
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{
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public static void main(String[] args)
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{
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EventQueue.invokeLater(new Runnable()
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{
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public void run()
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{
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XMLWriteFrame frame = new XMLWriteFrame();
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setVisible(true);
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}
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});
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}
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}
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/**
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* A frame with a component for showing a modern drawing.
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*/
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class XMLWriteFrame extends JFrame
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{
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public XMLWriteFrame()
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{
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setTitle("XMLWriteTest");
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setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
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chooser = new JFileChooser();
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// add component to frame
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comp = new RectangleComponent();
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add(comp);
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// set up menu bar
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JMenuBar menuBar = new JMenuBar();
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setJMenuBar(menuBar);
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JMenu menu = new JMenu("File");
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menuBar.add(menu);
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JMenuItem newItem = new JMenuItem("New");
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menu.add(newItem);
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newItem.addActionListener(new ActionListener()
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{
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public void actionPerformed(ActionEvent event)
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{
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comp.newDrawing();
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}
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});
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JMenuItem saveItem = new JMenuItem("Save with DOM/XSLT");
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menu.add(saveItem);
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saveItem.addActionListener(new ActionListener()
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{
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public void actionPerformed(ActionEvent event)
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{
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try
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{
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saveDocument();
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}
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catch (Exception e)
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{
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JOptionPane.showMessageDialog(XMLWriteFrame.this, e.toString());
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}
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}
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});
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JMenuItem saveStAXItem = new JMenuItem("Save with StAX");
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menu.add(saveStAXItem);
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saveStAXItem.addActionListener(new ActionListener()
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{
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public void actionPerformed(ActionEvent event)
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{
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try
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{
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saveStAX();
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}
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catch (Exception e)
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{
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JOptionPane.showMessageDialog(XMLWriteFrame.this, e.toString());
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}
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}
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});
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JMenuItem exitItem = new JMenuItem("Exit");
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menu.add(exitItem);
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exitItem.addActionListener(new ActionListener()
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{
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public void actionPerformed(ActionEvent event)
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{
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System.exit(0);
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}
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});
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}
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/**
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* Saves the drawing in SVG format, using DOM/XSLT
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*/
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public void saveDocument() throws TransformerException, IOException
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{
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if (chooser.showSaveDialog(this) != JFileChooser.APPROVE_OPTION) return;
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File f = chooser.getSelectedFile();
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Document doc = comp.buildDocument();
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Transformer t = TransformerFactory.newInstance().newTransformer();
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t.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,
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"http://www.w3.org/TR/2000/CR-SVG-20000802/DTD/svg-20000802.dtd");
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t.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "-//W3C//DTD SVG 20000802//EN");
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t.setOutputProperty(OutputKeys.INDENT, "yes");
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t.setOutputProperty(OutputKeys.METHOD, "xml");
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t.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
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t.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(f)));
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}
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/**
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* Saves the drawing in SVG format, using StAX
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*/
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public void saveStAX() throws FileNotFoundException, XMLStreamException
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{
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if (chooser.showSaveDialog(this) != JFileChooser.APPROVE_OPTION) return;
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File f = chooser.getSelectedFile();
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XMLOutputFactory factory = XMLOutputFactory.newInstance();
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XMLStreamWriter writer = factory.createXMLStreamWriter(new FileOutputStream(f));
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comp.writeDocument(writer);
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writer.close();
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}
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public static final int DEFAULT_WIDTH = 300;
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public static final int DEFAULT_HEIGHT = 200;
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private RectangleComponent comp;
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private JFileChooser chooser;
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}
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/**
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* A component that shows a set of colored rectangles
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*/
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class RectangleComponent extends JComponent
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{
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public RectangleComponent()
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{
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rects = new ArrayList<Rectangle2D>();
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colors = new ArrayList<Color>();
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generator = new Random();
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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try
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{
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builder = factory.newDocumentBuilder();
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}
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catch (ParserConfigurationException e)
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{
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e.printStackTrace();
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}
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}
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/**
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* Create a new random drawing.
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*/
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public void newDrawing()
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{
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int n = 10 + generator.nextInt(20);
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rects.clear();
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colors.clear();
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for (int i = 1; i <= n; i++)
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{
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int x = generator.nextInt(getWidth());
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int y = generator.nextInt(getHeight());
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int width = generator.nextInt(getWidth() - x);
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int height = generator.nextInt(getHeight() - y);
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rects.add(new Rectangle(x, y, width, height));
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int r = generator.nextInt(256);
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int g = generator.nextInt(256);
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int b = generator.nextInt(256);
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colors.add(new Color(r, g, b));
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}
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repaint();
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}
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public void paintComponent(Graphics g)
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{
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if (rects.size() == 0) newDrawing();
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Graphics2D g2 = (Graphics2D) g;
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// draw all rectangles
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for (int i = 0; i < rects.size(); i++)
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{
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g2.setPaint(colors.get(i));
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g2.fill(rects.get(i));
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}
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}
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/**
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* Creates an SVG document of the current drawing.
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* @return the DOM tree of the SVG document
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*/
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public Document buildDocument()
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{
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Document doc = builder.newDocument();
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Element svgElement = doc.createElement("svg");
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doc.appendChild(svgElement);
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svgElement.setAttribute("width", "" + getWidth());
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svgElement.setAttribute("height", "" + getHeight());
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for (int i = 0; i < rects.size(); i++)
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{
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Color c = colors.get(i);
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Rectangle2D r = rects.get(i);
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Element rectElement = doc.createElement("rect");
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rectElement.setAttribute("x", "" + r.getX());
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rectElement.setAttribute("y", "" + r.getY());
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rectElement.setAttribute("width", "" + r.getWidth());
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rectElement.setAttribute("height", "" + r.getHeight());
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rectElement.setAttribute("fill", colorToString(c));
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svgElement.appendChild(rectElement);
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}
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return doc;
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}
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/**
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* Writers an SVG document of the current drawing.
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* @param writer the document destination
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*/
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public void writeDocument(XMLStreamWriter writer) throws XMLStreamException
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{
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writer.writeStartDocument();
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writer.writeDTD("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 20000802//EN\" "
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+ "\"http://www.w3.org/TR/2000/CR-SVG-20000802/DTD/svg-20000802.dtd\">");
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writer.writeStartElement("svg");
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writer.writeAttribute("width", "" + getWidth());
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writer.writeAttribute("height", "" + getHeight());
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for (int i = 0; i < rects.size(); i++)
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{
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Color c = colors.get(i);
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Rectangle2D r = rects.get(i);
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writer.writeEmptyElement("rect");
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writer.writeAttribute("x", "" + r.getX());
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writer.writeAttribute("y", "" + r.getY());
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writer.writeAttribute("width", "" + r.getWidth());
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writer.writeAttribute("height", "" + r.getHeight());
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writer.writeAttribute("fill", colorToString(c));
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}
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writer.writeEndDocument(); // closes svg element
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}
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/**
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* Converts a color to a hex value.
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* @param c a color
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* @return a string of the form #rrggbb
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*/
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private static String colorToString(Color c)
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{
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StringBuffer buffer = new StringBuffer();
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buffer.append(Integer.toHexString(c.getRGB() & 0xFFFFFF));
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while (buffer.length() < 6)
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buffer.insert(0, '0');
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buffer.insert(0, '#');
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return buffer.toString();
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}
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private ArrayList<Rectangle2D> rects;
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private ArrayList<Color> colors;
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private Random generator;
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private DocumentBuilder builder;
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}
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