引子只是個小問題，JTextArea多行文本，想設(shè)置文字的對齊方式為居中對齊，卻發(fā)現(xiàn)死活沒有合適有效的方法，又試了JTextField和JLabel，都不理想。搜了一溜夠看到JTextPane的解決方法，其實真是有點兒大材小用了。JTextPane里可以設(shè)置style，對齊方式、字體字號、顏色等等，并且還可以設(shè)置style的作用范圍，挺方便的。另外，想把文字區(qū)域背景設(shè)為透明的也是在API中找了一通，才發(fā)現(xiàn)敢情就是setOpacity，呃，對這個單詞實在是太不敏感了。。。。
把在coderanch上搜的例子貼在這里吧，以防以后忘了：
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();
}
}