java字体设置，包括大小，颜色，加粗，下划线，对齐，斜体的设置

本文转自：http://www.blogjava.net/Swing/archive/2007/12/26/128965.html

下面的代码告诉我们该怎么在文本编辑器中设置字体大小，颜色，加粗，下划线等许多便捷操作~
感谢原作者提供的代码。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.swing.text.AttributeSet;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Document;
import javax.swing.text.EditorKit;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
import javax.swing.text.StyledEditorKit;
public class TestFonts extends javax.swing.JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private JPanel jp1;
    private JButton color;
    private JTextPane jep;
    private JScrollPane jsp;
    private JButton font;
    /**
     * Auto-generated main method to display this JFrame
     */
    public static void main(String[] args) {
        TestFonts inst = new TestFonts();
        inst.setVisible(true);
    }
    public TestFonts() {
        super();
        initGUI();
    }
    private void initGUI() {
        try {
            BorderLayout thisLayout = new BorderLayout();
            getContentPane().setLayout(thisLayout);
            setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
            {
                jp1 = new JPanel();
                getContentPane().add(jp1, BorderLayout.NORTH);
                {
                    font = new JButton();
                    font.addActionListener(this);
                    jp1.add(font);
                    font.setText("font");
                }
                {
                    color = new JButton();
                    jp1.add(color);
                    color.addActionListener(this);
                    color.setText("color");
                }
            }
            {
                jsp = new JScrollPane();
                getContentPane().add(jsp, BorderLayout.CENTER);
                {
                    jep = new JTextPane();
                    jsp.setViewportView(jep);
                    jep.setDocument(new DefaultStyledDocument());
                }
            }
            pack();
            setSize(400, 300);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static void setFontSize(JEditorPane editor, int size) {
        if (editor != null) {
            if ((size > 0) && (size < 512)) {
                MutableAttributeSet attr = new SimpleAttributeSet();
                StyleConstants.setFontSize(attr, size);
                setCharacterAttributes(editor, attr, false);
            } else {
                UIManager.getLookAndFeel().provideErrorFeedback(editor);
            }
        }
    }
    public static void setForeground(JEditorPane editor, Color fg) {
        if (editor != null) {
            if (fg != null) {
                MutableAttributeSet attr = new SimpleAttributeSet();
                StyleConstants.setForeground(attr, fg);
                setCharacterAttributes(editor, attr, false);
            } else {
                UIManager.getLookAndFeel().provideErrorFeedback(editor);
            }
        }
    }
    public static final void setCharacterAttributes(JEditorPane editor,
            AttributeSet attr, boolean replace) {
        int p0 = editor.getSelectionStart();
        int p1 = editor.getSelectionEnd();
        if (p0 != p1) {
            StyledDocument doc = getStyledDocument(editor);
            doc.setCharacterAttributes(p0, p1 - p0, attr, replace);
        }
        StyledEditorKit k = getStyledEditorKit(editor);
        MutableAttributeSet inputAttributes = k.getInputAttributes();
        if (replace) {
            inputAttributes.removeAttributes(inputAttributes);
        }
        inputAttributes.addAttributes(attr);
    }
    protected static final StyledDocument getStyledDocument(JEditorPane e) {
        Document d = e.getDocument();
        if (d instanceof StyledDocument) {
            return (StyledDocument) d;
        }
        throw new IllegalArgumentException("document must be StyledDocument");
    }
    protected static final StyledEditorKit getStyledEditorKit(JEditorPane e) {
        EditorKit k = e.getEditorKit();
        if (k instanceof StyledEditorKit) {
            return (StyledEditorKit) k;
        }
        throw new IllegalArgumentException("EditorKit must be StyledEditorKit");
    }
    public void actionPerformed(ActionEvent e) {
        Object obj = e.getSource();
        if (obj == font) {
            JEditorPane editor = jep;
            setFontSize(editor, 20);
        }
        if (obj == color) {
            JEditorPane editor = jep;
            setForeground(editor, Color.red);
        }
    }
}