[JAVA100例]018、使用HTML语言(java100例)

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[JAVA100例]018、使用HTML语言(java100例)

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/**
 * <p>Title: 在swing中使用html语言</p>
 * <p>Description: 这里演示使用html语言在swing面板上构造显示信息</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Filename: HtmlDemo.java</p>
 * @version 1.0
 */

public class HtmlDemo extends JPanel
                      implements ActionListener {
    JLabel theLabel;
    JTextArea htmlTextArea;
/**
 *<br>方法说明:构造器,描述窗体中的成员
 *<br>输入参数:
 *<br>返回类型:
 */
    public HtmlDemo() {
        setLayout(new BoxLayout(this, BoxLayout.LINE_AXIS));

        String initialText = "<html>/n" +
                "颜色和字体测试:/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";
        //定义一个文本框
        htmlTextArea = new JTextArea(10, 20);
        htmlTextArea.setText(initialText);
        JScrollPane scrollPane = new JScrollPane(htmlTextArea);
        //定义按钮
        JButton changeTheLabel = new JButton("改变显示");
        changeTheLabel.setMnemonic(KeyEvent.VK_C);
        changeTheLabel.setAlignmentX(Component.CENTER_ALIGNMENT);
        changeTheLabel.addActionListener(this);
        //定义标签
        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);
            }
        };
        //设置标签的对齐方式
        theLabel.setVerticalAlignment(SwingConstants.CENTER);
        theLabel.setHorizontalAlignment(SwingConstants.CENTER);
        //构造一个带边框的左边的编辑面板
        JPanel leftPanel = new JPanel();
        leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.PAGE_AXIS));
        leftPanel.setBorder(BorderFactory.createCompoundBorder(
                BorderFactory.createTitledBorder(
                    "编辑HTML,点击按钮显示结果。"),
                BorderFactory.createEmptyBorder(10,10,10,10)));
        leftPanel.add(scrollPane);
        leftPanel.add(Box.createRigidArea(new Dimension(0,10)));
        leftPanel.add(changeTheLabel);
         //构造一个带边框的右边显示的面板
        JPanel rightPanel = new JPanel();
        rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.PAGE_AXIS));
        rightPanel.setBorder(BorderFactory.createCompoundBorder(
                        BorderFactory.createTitledBorder("这里使用标签显示HTML结果"),
                        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);
    }
/**
 *<br>方法说明:事件监听,当用户点击按钮触发
 *<br>输入参数:
 *<br>返回类型:
 */
    public void actionPerformed(ActionEvent e) {
        theLabel.setText(htmlTextArea.getText());
    }
/**
 *<br>方法说明:主方法
 *<br>输入参数:
 *<br>返回类型:
 */
    public static void main(String[] args) {

        JFrame.setDefaultLookAndFeelDecorated(true);

        //创建窗体
        JFrame frame = new JFrame("HtmlDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //创建面板
        JComponent newContentPane = new HtmlDemo();
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);

        //显示窗体
        frame.pack();
        frame.setVisible(true);
    }
}