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.image.BufferedImage;
import java.awt.image.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;
/**
* <p>
* Title: LoonFramework
* </p>
* <p>
* Description:
* </p>
* <p>
* Copyright: Copyright (c) 2007
* </p>
* <p>
* Company: LoonFramework
* </p>
*
* @author chenpeng
* @email：ceponline@yahoo.com.cn
* @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><font color='red'><a href="http://www.helpsoff.com.cn" target="_blank">支持SOFF，插件无罪</a></font>";
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);
}
}
效果图：
这时的Swing，既可以实现Swing原有组件功能，也可以接受Html操作，可说是JavaGUI技术中为数不多的亮点之一。
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.image.BufferedImage;import java.awt.image.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;/**
* <p> * Title: LoonFramework * </p> * <p> * Description: * </p> * <p> * Copyright: Copyright (c) 2007 * </p> * <p> * Company: LoonFramework * </p> * * @author chenpeng * @email：ceponline@yahoo.com.cn * @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><font color='red'><a href="http://www.helpsoff.com.cn" target="_blank">支持SOFF，插件无罪</a></font>"; 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); }}效果图：
这时的Swing，既可以实现Swing原有组件功能，也可以接受Html操作，可说是JavaGUI技术中为数不多的亮点之一。
