JTextArea->JTextPane 解决文字对齐方式的问题
转载自：http://www.blogjava.net/cerulean/archive/2010/03/10/314976.html
引子只是个小问题，JTextArea多行文本，想设置文字的对齐方式为居中对齐，却发现死活没有合适有效的方法，又试了JTextField和JLabel，都不理想。搜了一溜够看到JTextPane的解决方法，其实真是有点儿大材小用了。JTextPane里可以设置style，对齐方式、字体字号、颜色等等，并且还可以设置style的作用范围，挺方便的。另外，想把文字区域背景设为透明的也是在API中找了一通，才发现敢情就是setOpacity，呃，对这个单词实在是太不敏感了。。。。
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把在coderanch上搜的例子贴在这里吧，以防以后忘了：
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import?java.awt.*;??import?javax.swing.*;??import?javax.swing.text.*;?????public?class?Styling??
{??
????public?Styling()??
????{??????????String?text?=?"To?refer?to?locations?within?the?sequence,?the?"?+????????????????????????"coordinates?used?are?the?location?between?two?"?+????????????????????????"characters.\nAs?the?diagram?below?shows,?a?location?"?+????????????????????????"in?a?text?document?can?be?referred?to?as?a?position,?"?+????????????????????????"or?an?offset.?This?position?is?zero-based.";?????????????SimpleAttributeSet?aSet?=?new?SimpleAttributeSet();???????????StyleConstants.setForeground(aSet,?Color.blue);??????????StyleConstants.setBackground(aSet,?Color.orange);??????????StyleConstants.setFontFamily(aSet,?"lucida?bright?italic");??????????StyleConstants.setFontSize(aSet,?18);?????????????SimpleAttributeSet?bSet?=?new?SimpleAttributeSet();??????????StyleConstants.setAlignment(bSet,?StyleConstants.ALIGN_CENTER);??????????StyleConstants.setUnderline(bSet,?true);??????????StyleConstants.setFontFamily(bSet,?"lucida?typewriter?bold");??????????StyleConstants.setFontSize(bSet,?24);?????????????JTextPane?textPane?=?new?JTextPane();??????????textPane.setText(text);??????????StyledDocument?doc?=?textPane.getStyledDocument();??????????doc.setCharacterAttributes(105,?doc.getLength()-105,?aSet,?false);??????????doc.setParagraphAttributes(0,?104,?bSet,?false);?????????????JFrame?f?=?new?JFrame();??????????f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);??????????f.add(new?JScrollPane(textPane));??????????f.setSize(400,400);??????????f.setLocation(200,200);??????????f.setVisible(true);??
????}?????????public?static?void?main(String[]?args)??????{??????????new?Styling();??????}??
}??
