📄 htmldemo.java
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package components;/* HtmlDemo.java needs no other files. */import javax.swing.*;import java.awt.*;import java.awt.event.*;public class HtmlDemo extends JPanel implements ActionListener { JLabel theLabel; JTextArea htmlTextArea; public HtmlDemo() { setLayout(new BoxLayout(this, BoxLayout.LINE_AXIS)); String initialText = "<html>\n" + "Color and font test:\n" + "<ul>\n" + "<li><font color=red>red</font>\n" + "<li><font color=blue>blue</font>\n" + "<li><font color=green>green</font>\n" + "<li><font size=-2>small</font>\n" + "<li><font size=+2>large</font>\n" + "<li><i>italic</i>\n" + "<li><b>bold</b>\n" + "</ul>\n"; htmlTextArea = new JTextArea(10, 20); htmlTextArea.setText(initialText); JScrollPane scrollPane = new JScrollPane(htmlTextArea); JButton changeTheLabel = new JButton("Change the label"); changeTheLabel.setMnemonic(KeyEvent.VK_C); changeTheLabel.setAlignmentX(Component.CENTER_ALIGNMENT); changeTheLabel.addActionListener(this); theLabel = new JLabel(initialText) { public Dimension getPreferredSize() { return new Dimension(200, 200); } public Dimension getMinimumSize() { return new Dimension(200, 200); } public Dimension getMaximumSize() { return new Dimension(200, 200); } }; theLabel.setVerticalAlignment(SwingConstants.CENTER); theLabel.setHorizontalAlignment(SwingConstants.CENTER); JPanel leftPanel = new JPanel(); leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.PAGE_AXIS)); leftPanel.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder( "Edit the HTML, then click the button"), BorderFactory.createEmptyBorder(10,10,10,10))); leftPanel.add(scrollPane); leftPanel.add(Box.createRigidArea(new Dimension(0,10))); leftPanel.add(changeTheLabel); JPanel rightPanel = new JPanel(); rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.PAGE_AXIS)); rightPanel.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("A label with HTML"), BorderFactory.createEmptyBorder(10,10,10,10))); rightPanel.add(theLabel); setBorder(BorderFactory.createEmptyBorder(10,10,10,10)); add(leftPanel); add(Box.createRigidArea(new Dimension(10,0))); add(rightPanel); } //React to the user pushing the Change button. public void actionPerformed(ActionEvent e) { theLabel.setText(htmlTextArea.getText()); } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event dispatch thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("HtmlDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Add content to the window. frame.add(new HtmlDemo()); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event dispatch thread: //creating and showing this application's GUI. SwingUtilities.invokeLater(new Runnable() { public void run() { //Turn off metal's use of bold fonts UIManager.put("swing.boldMetal", Boolean.FALSE); createAndShowGUI(); } }); }}⌨️ 快捷键说明
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