java编写文本编辑器字体加粗，上颜色功能

发表于 2013-05-08 03:32:12 by 月小升

最近修改以前一个超级网站编辑器，之前仅仅有格式化字符的功能，最近需要一个能给字体加粗的功能。

发现java编写awt 窗口还是蛮费劲的。

特留在此，方便朋友们相互学习。

实现功能：

对选取的一段文字进行加粗

（上颜色自己发挥，原理一样。）

要点
1.不能用JTextArea
2.采用JTextPane
3.获取选中的文本算法

package com.javaer.examples.awt;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.WindowConstants;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Document;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;


public class RichEdit  extends JFrame {
	JTextPane textPane;
	
	JButton bold;
	public RichEdit(){
		textPane = new JTextPane();
		textPane.setBounds(0, 0, 300, 300);
		setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);  
		setSize(new Dimension(500,500));  
		
	}
	
		public void gui() {
		  Container   c   =   getContentPane(); 
		  c.setLayout(null); 
	
		  
		  bold = new JButton(" 粗体 ");
		  bold.setBounds(new Rectangle(400, 120, 100, 42)); 
		  c.add(bold);	
		  
		  //触发粗体
		  bold.addActionListener(new ActionListener() {
			  public void actionPerformed(ActionEvent e) {  
				
				  Document doc = textPane.getDocument();
				  int start = textPane.getSelectionStart();
				  int end  = textPane.getSelectionEnd();
				  String str = textPane.getSelectedText();
				  try {
					doc.remove(start, end-start);
				} catch (BadLocationException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				  SimpleAttributeSet attrSet = new SimpleAttributeSet();
				  StyleConstants.setBold(attrSet, true);
				  StyleConstants.setFontFamily(attrSet, "微软雅黑");
				  StyleConstants.setFontSize(attrSet, 18);
				  StyleConstants.setForeground(attrSet, Color.black); // 颜色
				
				  try {
					doc.insertString(start, str, attrSet);
				} catch (BadLocationException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
			
			  }
		  });
		
		  

		c.add(textPane);
		textPane.setFont(new Font("微软雅黑", Font.PLAIN, 16));
	

		//	this.getContentPane().add(textPane, BorderLayout.CENTER);
		this.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		
		this.setVisible(true);
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		RichEdit re = new RichEdit();
		re.gui();
	}

}

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首发地址：月小升博客 – https://java-er.com/blog/java-awt-bold/
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