📄 htmldemo.java
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import javax.swing.*;import java.awt.*;import java.awt.event.*;public class HtmlDemo extends JPanel { JLabel theLabel; JTextArea htmlTextArea; public HtmlDemo() { String initialText = "<html>\n" + "颜色和字体测试：\n" + "<ul>\n" + "<li><font color=red>红色</font>\n" + "<li><font color=blue>蓝色</font>\n" + "<li><font color=green>绿色</font>\n" + "<li><font size=-2>小</font>\n" + "<li><font size=+2>大</font>\n" + "<li><i>斜体</i>\n" + "<li><b>粗体</b>\n" + "</ul>\n"; htmlTextArea = new JTextArea(10, 20); htmlTextArea.setText(initialText); JScrollPane scrollPane = new JScrollPane(htmlTextArea); JButton changeTheLabel = new JButton("改变标签显示内容"); changeTheLabel.setMnemonic(KeyEvent.VK_C); changeTheLabel.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { theLabel.setText(htmlTextArea.getText()); } catch (Throwable exc) { JOptionPane.showMessageDialog( HtmlDemo.this, "您指定的HTML无效."); } } }); changeTheLabel.setAlignmentX(Component.CENTER_ALIGNMENT); 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.Y_AXIS)); leftPanel.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder( "首先编辑HTML，然后单击按钮"), 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.Y_AXIS)); rightPanel.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("使用HTML标记的标签"), BorderFactory.createEmptyBorder(10,10,10,10))); rightPanel.add(theLabel); setLayout(new BoxLayout(this, BoxLayout.X_AXIS)); setBorder(BorderFactory.createEmptyBorder(10,10,10,10)); add(leftPanel); add(Box.createRigidArea(new Dimension(10,0))); add(rightPanel); } public static void main(String args[]) { JFrame f = new JFrame("HtmlDemo"); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); f.getContentPane().add(new HtmlDemo()); f.pack(); f.setVisible(true); }}⌨️ 快捷键说明
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