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在Swing中使用Html标签

2007-12-25 10:32 211 查看

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;

/** *//**

*

* Title: LoonFramework

*

*

* Description:

*

*

*

*

* 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);

}

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。

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标签： 职场标签 Html 休闲 Swing

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