设置java的JTextPane字体加粗

package manage;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
/**
* 测试点击按钮后，部分字体加粗
* doc.setCharacterAttributes(0, 100, boldStyle, true); 该方法设置加粗字体数量
* @author lance
*/
public class TextSamplerDemo {
public static void main(String[] args) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception evt) {}

JFrame f = new JFrame("Styles Example 3");

StyleContext sc = new StyleContext();
final DefaultStyledDocument doc = new DefaultStyledDocument(sc);
JTextPane pane = new JTextPane(doc);

Style defaultStyle = sc.getStyle(StyleContext.DEFAULT_STYLE);
final Style mainStyle = sc.addStyle("MainStyle", defaultStyle);
StyleConstants.setLeftIndent(mainStyle, 16);
StyleConstants.setRightIndent(mainStyle, 16);
StyleConstants.setFirstLineIndent(mainStyle, 16);
StyleConstants.setFontFamily(mainStyle, "serif");
StyleConstants.setFontSize(mainStyle, 12);

final Style boldStyle = sc.addStyle("MainStyle", defaultStyle);
StyleConstants.setBold(boldStyle, true);

try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
try {
doc.setLogicalStyle(0, mainStyle);

doc.insertString(0, text, null);
} catch (BadLocationException e) {
}
doc.dump(System.out);
}
});
} catch (Exception e) {
System.out.println("Exception when constructing document: " + e);
System.exit(1);
}

JButton button = new JButton("apply");
button.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
//设置多少字体加粗
doc.setCharacterAttributes(0, 100, boldStyle, true);
}

});

JScrollPane scrollPane = new JScrollPane(pane);

JPanel panel = new JPanel();
panel.add(button, BorderLayout.NORTH);
panel.add(scrollPane, BorderLayout.CENTER);

f.getContentPane().add(scrollPane, BorderLayout.CENTER);
f.getContentPane().add(button, BorderLayout.SOUTH);
f.setSize(400, 300);
f.setVisible(true);
}

public static final String text =
"Attributes, Styles and Style Contexts\n" +
"The simple PlainDocument class that you saw in the previous " +
"chapter is only capable of holding text. The more complex text " +
"components use a more sophisticated model that implements the " +
"StyledDocument interface. StyledDocument is a sub-interface of " +
"Document that contains methods for manipulating attributes that " +
"control the way in which the text in the document is displayed. " + "\n\r" +
"The Swing text package contains a concrete implementation of " +
"StyledDocument called DefaultStyledDocument that is used as the " +
"default model for JTextPane and is also the base class from which " +
"more specific models, such as the HTMLDocument class that handles " +
"input in HTML format, can be created. In order to make use of " +
"DefaultStyledDocument and JTextPane, you need to understand how " +
"Swing represents and uses attributes.\n";

}