用a4j:mediaOutput 怎樣在頁面顯示一個applet的小運用程序呀？？

头疼呀 看richfaces的demo中
<a4j:mediaOutput element="img" cacheable="false" session="true"
        createContent="#{mediaBean.paint}" value="#{mediaData}" mimeType="image/jpeg" />

我把element="applet" mineType="application/x-java-applet"
就是那个createContent="#{mediaBean.paint}" 不知道怎样把一个applet out出来，我的applet 是一个计算器

请帮忙分析出绿色内的代码。。
或有很好的建议： 先谢谢。。。

import java.awt.*;  
import java.awt.event.*;  
import java.io.IOException;
import java.io.OutputStream;

import javax.swing.*;  

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.AutoCreate;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
 
@Name("calculator")
@Scope(ScopeType.SESSION)
@AutoCreate

public class Calculator extends JFrame implements ActionListener {  
      
    private static final long serialVersionUID = 1L;

    private JButton btnZero, btnOne, btnTwo, btnThree, btnFour, btnFive,  
            btnSix, btnSeven, btnEight, btnNine, btnPlus, btnMinus, btnTimes,  
            btnDivided, btnEqual, btnPoint, btnUEqual, btnMore, btnLess, btnEMore,
            btnELess,btnLeft,btnRight,btnAnd,btnOr,btnQuote,btnRound,btnBack;  
  
   private StringBuffer str; 
   private int  start,end;
   
   public void paintCalculator(OutputStream out,Object data)throws IOException{
   ...
  
   }
      public Calculator() {  
        super("編輯器");  
        this.setSize(311, 231);  
      //  this.setLocation(300, 300);  
      //  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
 
        this.setLayout(new GridLayout(1, 1));// 网格布局  
        JPanel panel = new JPanel(new GridLayout(6, 1));// 面板 网格布局6行1列  
        this.add(panel);  
 
        JPanel panel_1 = new JPanel(new GridLayout(1, 5));  
        panel.add(panel_1);  
 
        btnPlus = new JButton("+");  
        panel_1.add(btnPlus);  
        btnPlus.addActionListener(this);  
        btnMinus = new JButton("-");  
        panel_1.add(btnMinus);  
        btnMinus.addActionListener(this);  
        btnTimes = new JButton("*");  
        panel_1.add(btnTimes);  
        btnTimes.addActionListener(this);  
        btnDivided = new JButton("/");  
        panel_1.add(btnDivided);  
        btnDivided.addActionListener(this);
        btnQuote = new JButton("'");  
        panel_1.add(btnQuote);  
        btnQuote.addActionListener(this);
 
        JPanel panel_2 = new JPanel(new GridLayout(1, 6));  
        panel.add(panel_2);  
 
        btnEqual = new JButton("=");  
        panel_2.add(btnEqual);  
        btnEqual.addActionListener(this);  
        btnMore = new JButton(">");  
        panel_2.add(btnMore);  
        btnMore.addActionListener(this);  
        btnEMore = new JButton(">=");  
        panel_2.add(btnEMore);  
        btnEMore.addActionListener(this);  
        btnELess = new JButton("<=");  
        panel_2.add(btnELess);  
        btnELess.addActionListener(this);
        btnLess = new JButton("<");  
        panel_2.add(btnLess);  
        btnLess.addActionListener(this);
        btnUEqual = new JButton("<>");  
        panel_2.add(btnUEqual);  
        btnUEqual.addActionListener(this);
 
        JPanel panel_3 = new JPanel(new GridLayout(1, 4));  
        panel.add(panel_3);  
 
        btnLeft = new JButton("(");  
        panel_3.add(btnLeft);  
        btnLeft.addActionListener(this);  
        btnRight = new JButton(")");  
        panel_3.add(btnRight);  
        btnRight.addActionListener(this);  
        btnAnd = new JButton("and");  
        panel_3.add(btnAnd);  
        btnAnd.addActionListener(this);  
        btnOr = new JButton("or");  
        panel_3.add(btnOr);  
        btnOr.addActionListener(this);  
 
        JPanel panel_4 = new JPanel(new GridLayout(1, 6));  
        panel.add(panel_4);  
 
        btnZero = new JButton("0");  
        panel_4.add(btnZero);  
        btnZero.addActionListener(this);
        btnOne = new JButton("1");  
        panel_4.add(btnOne);  
        btnOne.addActionListener(this);  
        btnTwo = new JButton("2");  
        panel_4.add(btnTwo);  
        btnTwo.addActionListener(this);  
        btnThree = new JButton("3");  
        panel_4.add(btnThree);  
        btnThree.addActionListener(this);  
        btnFour = new JButton("4");  
        panel_4.add(btnFour);  
        btnFour.addActionListener(this);
        btnFive = new JButton("5");  
        panel_4.add(btnFive);  
        btnFive.addActionListener(this);
 
        JPanel panel_5 = new JPanel(new GridLayout(1, 5));  
        panel.add(panel_5);  
 
        btnSix = new JButton("6");  
        panel_5.add(btnSix);  
        btnSix.addActionListener(this);
        btnSeven = new JButton("7");  
        panel_5.add(btnSeven);  
        btnSeven.addActionListener(this);
        btnEight = new JButton("8");  
        panel_5.add(btnEight);  
        btnEight.addActionListener(this);
        btnNine = new JButton("9");  
        panel_5.add(btnNine);  
        btnNine.addActionListener(this);
        btnPoint = new JButton(".");  
        panel_5.add(btnPoint);  
        btnPoint.addActionListener(this);  
       
        JPanel panel_6 = new JPanel(new GridLayout(1, 2));  
        panel.add(panel_6);  
 
        btnRound = new JButton("Round");  
        panel_6.add(btnRound);  
        btnRound.addActionListener(this);
        btnBack = new JButton("Backspace");  
        panel_6.add(btnBack);  
        btnBack.addActionListener(this);
        
 
        str = new StringBuffer();  
 
        this.setVisible(true);  
 
    }  
    public void actionPerformed(ActionEvent e) {  

            if (e.getSource() == btnPlus) {  
               str.append("+ ");  
            }
            if (e.getSource() == btnMinus) {  
               str.append("- ");
            }
            if (e.getSource() == btnTimes) {  
               str.append("* "); 
            }
            if (e.getSource() == btnDivided) {  
                str.append("/ "); 
            }
            if (e.getSource() == btnEqual) {  
               str.append("= ");
            }  
            if (e.getSource() == btnPoint) {  
               str.append(". ");
            }  
 
            if (e.getSource() == btnUEqual) {  
                str.append("<> ");  
             }
             if (e.getSource() == btnMore) {  
                str.append("> ");
             }
             if (e.getSource() == btnLess) {  
                str.append("< "); 
             }
             if (e.getSource() == btnEMore) {  
                 str.append(">= "); 
             }
             if (e.getSource() == btnELess) {  
                str.append("<= ");
             }  
             if (e.getSource() == btnQuote) {  
                str.append("' ");
             }          
           
            if (e.getSource() == btnZero) {  
                str.append("0 ");  
             }
             if (e.getSource() == btnOne) {  
                str.append("1 ");
             }
             if (e.getSource() == btnTwo) {  
                str.append("2 "); 
             }
             if (e.getSource() == btnThree) {  
                 str.append("3 "); 
             }
             if (e.getSource() == btnFour) {  
                str.append("4 ");
             }
             if (e.getSource() == btnFive) {  
                 str.append("5 ");
              }
             if (e.getSource() == btnSix) {  
                str.append("6 ");
             }
             if (e.getSource() == btnSeven) {  
                 str.append("7 ");  
              }
              if (e.getSource() == btnEight) {  
                 str.append("8 ");
              }
              if (e.getSource() == btnNine) {  
                 str.append("9 "); 
              }
              if (e.getSource() == btnLeft) {  
                  str.append("( "); 
              }
              if (e.getSource() == btnRight) {  
                 str.append(") ");
              }  
              if (e.getSource() == btnAnd) {  
                 str.append("and ");
              }
              if (e.getSource() == btnOr) {  
                  str.append("or ");  
               }
               if (e.getSource() == btnRound) {  
                  str.append("Round "); 
               }
              
               if (e.getSource() == btnBack) {
                   if(!(str.length()==0)){
            end= str.lastIndexOf(" ");
              start=str.lastIndexOf(" ",end );
            str.delete(start, end);
              }
                }
    }  
}