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在Swing中，有時(shí)可能會(huì)出現(xiàn)一些較為復(fù)雜的樣式表現(xiàn)需求，如果單純通過代碼實(shí)現(xiàn)，往往得不償失。這時(shí)，我們就可以利用html標(biāo)簽，在組件中得到我們想要的效果。

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：ceponline@yahoo.com.cn

* @version 0.1

public class HtmlLable extends JPanel {

// 內(nèi)置了本地系統(tǒng)桌面操作支持

private Desktopdesktop;

private static final long serialVersionUID = 1L ;

// html內(nèi)容

private static final StringHTML_TEXT = " <html><fontcolor='red'><a>支持SOFF，插件無罪</a> " ;

public HtmlLable() {

super ( new BorderLayout());

final JLabellabel0 = new JLabel( " 普通的JLabel " );

final JLabellabel1 = new JLabel(HTML_TEXT);

final JLabellabel2 = new JLabel(HTML_TEXT) {

private static final long serialVersionUID = 1L ;

// 設(shè)定Enabled樣式

public void setEnabled( boolean b) {

super .setEnabled(b);

setForeground(b ? (Color)UIManager.get( " Label.foreground " )

:(Color)UIManager.get( " Label.disabledForeground " ));

}

} ;

final JLabellabel3 = new JLabel(HTML_TEXT) {

private static final long serialVersionUID = 1L ;

// 陰影

private BufferedImageshadow;

// 設(shè)定Enabled樣式

public void setEnabled( boolean b) {

setForeground(b ? (Color)UIManager.get( " Label.foreground " )

:(Color)UIManager.get( " Label.disabledForeground " ));

if ( ! b) {

BufferedImagesource = new BufferedImage(getWidth(),

getHeight(),BufferedImage.TYPE_INT_ARGB);

Graphics2Dg2 = source.createGraphics();

g2.setPaint( new Color( 0 , 0 , 0 , 0 ));

g2.fillRect( 0 , 0 ,getWidth(),getHeight());

paint(g2);

g2.dispose();

ColorConvertOpcolorConvert = new ColorConvertOp(ColorSpace

.getInstance(ColorSpace.CS_GRAY), null );

shadow = colorConvert.filter(source, null );

}

super .setEnabled(b);

}

public void paintComponent(Graphicsg) {

if (isEnabled()) {

super .paintComponent(g);

} else {

if (shadow != null )

g.drawImage(shadow, 0 , 0 , this );

}

} ;

/**

*設(shè)定為html

final JEditorPaneeditor1 = new MyHtmlEdit( " text/html " ,HTML_TEXT);

editor1.setOpaque( false );

editor1.setEditable( false );

final JEditorPaneeditor2 = 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 " ));

JPanelbox = 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));

JCheckBoxcheck = new JCheckBox( " setEnabled " , true );

check.setAction( new AbstractAction( " setEnabled " ) {

private static final long serialVersionUID = 1L ;

public void actionPerformed(ActionEvente) {

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();

}

/**

*自定義一個(gè)JEditorPane，用以處理html事件

* @author chenpeng

class MyHtmlEdit extends JEditorPane implements HyperlinkListener {

/**

private static final long serialVersionUID = 1L ;

public MyHtmlEdit(Stringtype,Stringtext) {

super (type,text);

addHyperlinkListener( this );

}

public void hyperlinkUpdate(HyperlinkEvente) {

if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {

try {

// 在本地瀏覽器中打開uri(jdk1.6后由于強(qiáng)化了awt,就不用再自己寫本地瀏覽器調(diào)用了)

desktop.browse(e.getURL().toURI());

} catch (IOExceptionex) {

ex.printStackTrace();

} catch (URISyntaxExceptionex) {

ex.printStackTrace();

}

/**

*創(chuàng)建面板

* @param title

* @param label

* @return

private JPanelmakePanel(Stringtitle,JComponentlabel) {

JPanelp = 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() {

JFrameframe = new JFrame( " 在Swing中使用Html標(biāo)簽 " );

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新項(xiàng),置頂

frame.setAlwaysOnTop( true );

frame.setVisible( true );

}

效果圖：

這時(shí)的Swing，既可以實(shí)現(xiàn)Swing原有組件功能，也可以接受Html操作，可說是JavaGUI技術(shù)中為數(shù)不多的亮點(diǎn)之一。

在Swing中使用Html標(biāo)簽

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