在Swing中使用Html标签

原创

cping 2007-12-25 10:32:00 ©著作权

文章标签 职场标签 Html 休闲 Swing 文章分类 Java 后端开发

©著作权归作者所有：来自51CTO博客作者cping的原创作品，请联系作者获取转载授权，否则将追究法律责任

在Swing中，有时可能会出现一些较为复杂的样式表现需求，如果单纯通过代码实现，往往得不偿失。这时，我们就可以利用html标签，在组件中得到我们想要的效果。

例子如下：

package org.loon.test;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Desktop;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.color.ColorSpace;
import java.awt.event.ActionEvent;
import java.awt.p_w_picpath.BufferedImage;
import java.awt.p_w_picpath.ColorConvertOp;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;

/** *//** * 
* Title: LoonFramework
* 
* 
* Description:
* 
* 
* Copyright: Copyright (c) 2007
* 
* 
* Company: LoonFramework
* 
*
* @author chenpeng
* @email：[email]ceponline@yahoo.com.cn[/email]
* @version 0.1
*/public class HtmlLable extends JPanel ...{
 // 内置了本地系统桌面操作支持 private Desktop desktop;

 private static final long serialVersionUID = 1L;

 // html内容 private static final String HTML_TEXT = "<html>支持SOFF，插件无罪</a>";

 public HtmlLable() ...{
 super(new BorderLayout());
 final JLabel label0 = new JLabel("普通的JLabel");
 final JLabel label1 = new JLabel(HTML_TEXT);
 final JLabel label2 = new JLabel(HTML_TEXT) ...{

 private static final long serialVersionUID = 1L;

 // 设定Enabled样式 public void setEnabled(boolean b) ...{
 super.setEnabled(b);
 setForeground(b ? (Color) UIManager.get("Label.foreground")
 : (Color) UIManager.get("Label.disabledForeground"));
 } };
 final JLabel label3 = new JLabel(HTML_TEXT) ...{
 private static final long serialVersionUID = 1L;

 // 阴影 private BufferedImage shadow;

 // 设定Enabled样式 public void setEnabled(boolean b) ...{
 setForeground(b ? (Color) UIManager.get("Label.foreground")
 : (Color) UIManager.get("Label.disabledForeground"));
 if (!b) ...{
 BufferedImage source = new BufferedImage(getWidth(),
 getHeight(), BufferedImage.TYPE_INT_ARGB);
 Graphics2D g2 = source.createGraphics();
 g2.setPaint(new Color(0, 0, 0, 0));
 g2.fillRect(0, 0, getWidth(), getHeight());
 paint(g2);
 g2.dispose();
 ColorConvertOp colorConvert = new ColorConvertOp(ColorSpace
 .getInstance(ColorSpace.CS_GRAY), null);
 shadow = colorConvert.filter(source, null);
 } super.setEnabled(b);
 }
 public void paintComponent(Graphics g) ...{
 if (isEnabled()) ...{
 super.paintComponent(g);
 } else ...{
 if (shadow != null)
 g.drawImage(shadow, 0, 0, this);
 } } };

 /** *//** * 设定为html
 */ final JEditorPane editor1 = new MyHtmlEdit("text/html", HTML_TEXT);
 editor1.setOpaque(false);
 editor1.setEditable(false);

 final JEditorPane editor2 = new MyHtmlEdit("text/html", HTML_TEXT);
 editor2.setOpaque(false);
 editor2.setEditable(false);

 editor2.putClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES,
 Boolean.TRUE);
 editor2.setFont((Font) UIManager.get("Label.font"));

 JPanel box = new JPanel(new GridLayout(2, 3));
 box.add(makePanel("JLabel", label0));
 box.add(makePanel("JLabel+Html", label1));
 box.add(makePanel("JLabel+Html+", label2));
 box.add(makePanel("JLabel+Html++", label3));
 box.add(makePanel("JEditorPane", editor1));
 box.add(makePanel("JEditorPane+", editor2));

 JCheckBox check = new JCheckBox("setEnabled", true);
 check.setAction(new AbstractAction("setEnabled") ...{
 private static final long serialVersionUID = 1L;

 public void actionPerformed(ActionEvent e) ...{
 boolean flag = ((JCheckBox) e.getSource()).isSelected();
 setVisible(false);
 label0.setEnabled(flag);
 label1.setEnabled(flag);
 label2.setEnabled(flag);
 label3.setEnabled(flag);
 editor1.setEnabled(flag);
 editor2.setEnabled(flag);
 setVisible(true);
 } });

 add(check, BorderLayout.NORTH);
 add(box, BorderLayout.CENTER);
 desktop = Desktop.getDesktop();

 }
 /** *//** * 自定义一个JEditorPane，用以处理html事件
 *
 * @author chenpeng
 *
 */ class MyHtmlEdit extends JEditorPane implements HyperlinkListener ...{
 /** *//** *
 */ private static final long serialVersionUID = 1L;

 public MyHtmlEdit(String type, String text) ...{
 super(type, text);
 addHyperlinkListener(this);

 }
 public void hyperlinkUpdate(HyperlinkEvent e) ...{

 if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) ...{
 try ...{
 // 在本地浏览器中打开uri(jdk1.6后由于强化了awt,就不用再自己写本地浏览器调用了) desktop.browse(e.getURL().toURI());

 } catch (IOException ex) ...{
 ex.printStackTrace();
 } catch (URISyntaxException ex) ...{
 ex.printStackTrace();
 }
 }
 } }
 /** *//** * 创建面板
 *
 * @param title
 * @param label
 * @return */ private JPanel makePanel(String title, JComponent label) ...{
 JPanel p = new JPanel(new GridLayout(1, 1));
 p.setBorder(BorderFactory.createTitledBorder(title));
 p.add(label);
 return p;
 }
 public static void main(String[] args) ...{
 EventQueue.invokeLater(new Runnable() ...{
 public void run() ...{
 createGUI();
 } });
 }
 public static void createGUI() ...{

 JFrame frame = new JFrame("在Swing中使用Html标签");
 frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
 frame.setSize(new Dimension(450, 200));

 frame.getContentPane().add(new HtmlLable());

 frame.setResizable(false);
 frame.setLocationRelativeTo(null);
 //jdk1.6新项,置顶 frame.setAlwaysOnTop(true);
 frame.setVisible(true);
 }
}