怎么用Java实现QQ消息输入框这种能表情图片和文字混排的效果

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;

public class Test extends JFrame  
{
    private JScrollPane scrollPane = null; // 滚动
    private JTextPane text = null;  
    private Box box = null; // 放输入组件的容器
    private JButton b_insert = null,
                     b_remove = null,  
                     b_icon = null; // 插入按钮;清除按钮;插入图片按钮
    private JTextField addText = null; // 文字输入框
//     字体名称;字号大小;文字样式;文字颜色;文字背景颜色
 private JComboBox fontName = null,  
                   fontSize = null,
                   fontStyle = null,  
                   fontColor = null,
                   fontBackColor = null;  

 private StyledDocument doc = null; // 非常重要插入文字样式就靠它了

 public Test()  
 {
     super("JTextPane Test");
     try  
     { // 使用Windows的界面风格
         UIManager.setLookAndFeel
         ("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
         }
     catch (Exception e)  
     {
         e.printStackTrace();
         }
  text = new JTextPane();
  text.setEditable(false); // 不可录入
  doc = text.getStyledDocument(); // 获得JTextPane的Document
  scrollPane = new JScrollPane(text);
  addText = new JTextField(18);
  String[] str_name = { "宋体", "黑体", "Dialog", "Gulim" };
  String[] str_Size = { "12", "14", "18", "22", "30", "40" };
  String[] str_Style = { "常规", "斜体", "粗体", "粗斜体" };
  String[] str_Color = { "黑色", "红色", "蓝色", "黄色", "绿色" };
  String[] str_BackColor = { "无色", "灰色", "淡红", "淡蓝", "淡黄", "淡绿" };
  fontName = new JComboBox(str_name); // 字体名称
  fontSize = new JComboBox(str_Size); // 字号
  fontStyle = new JComboBox(str_Style); // 样式
  fontColor = new JComboBox(str_Color); // 颜色
  fontBackColor = new JComboBox(str_BackColor); // 背景颜色
  b_insert = new JButton("插入"); // 插入
  b_remove = new JButton("清空"); // 清除
  b_icon = new JButton("图片"); // 插入图片
  b_insert.addActionListener(new ActionListener()  
  { // 插入文字的事件
     public void actionPerformed(ActionEvent e)  
     {
     insert(getFontAttrib());
     addText.setText("");
     }
   });
  b_remove.addActionListener(new ActionListener()
  { // 清除事件
     public void actionPerformed(ActionEvent e)  
     {
     text.setText("");
     }
   });
  b_icon.addActionListener(new ActionListener()  
  { // 插入图片事件
     public void actionPerformed(ActionEvent arg0)  
     {
     JFileChooser f = new JFileChooser(); // 查找文件
     f.showOpenDialog(null);
     insertIcon(f.getSelectedFile()); // 插入图片
     }
   });
  box = Box.createVerticalBox(); // 竖结构
  Box box_1 = Box.createHorizontalBox(); // 横结构
  Box box_2 = Box.createHorizontalBox(); // 横结构
  box.add(box_1);
  box.add(Box.createVerticalStrut(8)); // 两行的间距
  box.add(box_2);
  box.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8)); // 8个的边距
  // 开始将所需组件加入容器
  box_1.add(new JLabel("字体：")); // 加入标签
  box_1.add(fontName); // 加入组件
  box_1.add(Box.createHorizontalStrut(8)); // 间距
  box_1.add(new JLabel("样式："));
  box_1.add(fontStyle);
  box_1.add(Box.createHorizontalStrut(8));
  box_1.add(new JLabel("字号："));
  box_1.add(fontSize);
  box_1.add(Box.createHorizontalStrut(8));
  box_1.add(new JLabel("颜色："));
  box_1.add(fontColor);
  box_1.add(Box.createHorizontalStrut(8));
  box_1.add(new JLabel("背景："));
  box_1.add(fontBackColor);
  box_1.add(Box.createHorizontalStrut(8));
  box_1.add(b_icon);
  box_2.add(addText);
  box_2.add(Box.createHorizontalStrut(8));
  box_2.add(b_insert);
  box_2.add(Box.createHorizontalStrut(8));
  box_2.add(b_remove);
  this.getRootPane().setDefaultButton(b_insert); // 默认回车按钮
  this.getContentPane().add(scrollPane);
  this.getContentPane().add(box, BorderLayout.SOUTH);
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  this.setSize(600, 400);
  this.setLocationRelativeTo(null);
  this.setVisible(true);
  addText.requestFocus();
 }

 /**
  * 插入图片
  *  
  * @param icon
  */
 private void insertIcon(File file) {
  text.setCaretPosition(doc.getLength()); // 设置插入位置
  text.insertIcon(new ImageIcon(file.getPath())); // 插入图片
  insert(new FontAttrib()); // 这样做可以换行
 }

 /**
  * 将文本插入JTextPane
  *  
  * @param attrib
  */
 private void insert(FontAttrib attrib) {
  try { // 插入文本
   doc.insertString(doc.getLength(), attrib.getText() + "\n", attrib.getAttrSet());
  } catch (BadLocationException e) {
   e.printStackTrace();
  }
 }

 /**
  * 获取所需要的文字设置
  *  
  * @return FontAttrib
  */
 private FontAttrib getFontAttrib() {
  FontAttrib att = new FontAttrib();
  att.setText(addText.getText());
  att.setName((String) fontName.getSelectedItem());
  att.setSize(Integer.parseInt((String) fontSize.getSelectedItem()));
  String temp_style = (String) fontStyle.getSelectedItem();
  if (temp_style.equals("常规")) {
   att.setStyle(FontAttrib.GENERAL);
  } else if (temp_style.equals("粗体")) {
   att.setStyle(FontAttrib.BOLD);
  } else if (temp_style.equals("斜体")) {
   att.setStyle(FontAttrib.ITALIC);
  } else if (temp_style.equals("粗斜体")) {
   att.setStyle(FontAttrib.BOLD_ITALIC);
  }
  String temp_color = (String) fontColor.getSelectedItem();
  if (temp_color.equals("黑色")) {
   att.setColor(new Color(0, 0, 0));
  } else if (temp_color.equals("红色")) {
   att.setColor(new Color(255, 0, 0));
  } else if (temp_color.equals("蓝色")) {
   att.setColor(new Color(0, 0, 255));
  } else if (temp_color.equals("黄色")) {
   att.setColor(new Color(255, 255, 0));
  } else if (temp_color.equals("绿色")) {
   att.setColor(new Color(0, 255, 0));
  }
  String temp_backColor = (String) fontBackColor.getSelectedItem();
  if (!temp_backColor.equals("无色")) {
   if (temp_backColor.equals("灰色")) {
   att.setBackColor(new Color(200, 200, 200));
   } else if (temp_backColor.equals("淡红")) {
   att.setBackColor(new Color(255, 200, 200));
   } else if (temp_backColor.equals("淡蓝")) {
   att.setBackColor(new Color(200, 200, 255));
   } else if (temp_backColor.equals("淡黄")) {
   att.setBackColor(new Color(255, 255, 200));
   } else if (temp_backColor.equals("淡绿")) {
   att.setBackColor(new Color(200, 255, 200));
   }
  }
  return att;
 }

 public static void main(String args[]) {
  new Test();
 }

 /**
  * 字体的属性类
  */
 private class FontAttrib {
  public static final int GENERAL = 0; // 常规

  public static final int BOLD = 1; // 粗体

  public static final int ITALIC = 2; // 斜体

  public static final int BOLD_ITALIC = 3; // 粗斜体

  private SimpleAttributeSet attrSet = null; // 属性集

  private String text = null, name = null; // 要输入的文本和字体名称

  private int style = 0, size = 0; // 样式和字号

  private Color color = null, backColor = null; // 文字颜色和背景颜色

  /**
   * 一个空的构造（可当做换行使用）
   */
  public FontAttrib() {
  }

  /**
   * 返回属性集
   *  
   * @return
   */
  public SimpleAttributeSet getAttrSet() {
   attrSet = new SimpleAttributeSet();
   if (name != null)
   StyleConstants.setFontFamily(attrSet, name);
   if (style == FontAttrib.GENERAL) {
   StyleConstants.setBold(attrSet, false);
   StyleConstants.setItalic(attrSet, false);
   } else if (style == FontAttrib.BOLD) {
   StyleConstants.setBold(attrSet, true);
   StyleConstants.setItalic(attrSet, false);
   } else if (style == FontAttrib.ITALIC) {
   StyleConstants.setBold(attrSet, false);
   StyleConstants.setItalic(attrSet, true);
   } else if (style == FontAttrib.BOLD_ITALIC) {
   StyleConstants.setBold(attrSet, true);
   StyleConstants.setItalic(attrSet, true);
   }
   StyleConstants.setFontSize(attrSet, size);
   if (color != null)
   StyleConstants.setForeground(attrSet, color);
   if (backColor != null)
   StyleConstants.setBackground(attrSet, backColor);
   return attrSet;
  }

  /**
   * 设置属性集
   *  
   * @param attrSet
   */
  public void setAttrSet(SimpleAttributeSet attrSet) {
   this.attrSet = attrSet;
  }

  /* 后面的注释就不写了，一看就明白 */

  public String getText() {
   return text;
  }

  public void setText(String text) {
   this.text = text;
  }

  public Color getColor() {
   return color;
  }

  public void setColor(Color color) {
   this.color = color;
  }

  public Color getBackColor() {
   return backColor;
  }

  public void setBackColor(Color backColor) {
   this.backColor = backColor;
  }

  public String getName() {
   return name;
  }

  public void setName(String name) {
   this.name = name;
  }

  public int getSize() {
   return size;
  }

  public void setSize(int size) {
   this.size = size;
  }

  public int getStyle() {
   return style;
  }

  public void setStyle(int style) {
   this.style = style;
  }
 }

}