急求! actionPerformed 中的 repaint() 怎么不起作用

大家好:我下面这段代码是一个JAVA APPLET  ,点击"DownLoad"按钮后,会下载远程服务器的图片,我想在下载的时候在窗体上显示这样一个格式"1 of 3 photos downlading...",可是我这样写怎么显示不出来,是 repaint()   没起作用吗,应该怎么写啊?
package com.java.test;import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class DownPhoto3 extends Applet  implements ActionListener{
   
       String sTxt ;  
       String paths[];
   String pathss = "";
   private JFrame f; 
   private JPanel p,p2,p3; 
   private JButton  bl,bd,bc;
   private JTextField tx ,tx3;
   
   File file;
   
   /*public static void main(String args[]){
   DownPhoto3 pd = new DownPhoto3();
   pd.DownFrame();
   System.out.print("hello");
   }*/
    public void init(){
    
     this.DownFrame();
    }
    
    public void DownFrame(){
     f = new JFrame("Photo DownLoad");
     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     f.setBackground(Color.gray);
     p = new JPanel();
     f.setBounds(400, 400, 500, 200);
     f.setResizable(false);
                  f.add(p,"North");
        tx = new JTextField(30);
        tx.setEnabled(false);
        
        p.add(tx);
        
               
         bl = new JButton("Browse");
        
        bl.addActionListener(this);         p.add(bl);
        p2 = new JPanel();
        f.add(p2,"South");
        bd = new JButton("DownLoad");
        bc = new JButton("Cancel");
        
        
        bd.addActionListener(this);
        
        bc.addActionListener(this);
        p2.add(bd);
        p2.add(bc);
        
        p3 = new JPanel();
     f.add(p3,"Center");
     tx3 = new JTextField(20);
     //tx3.setText(this.getSTxt());
     //tx3.repaint();
     tx3.setBackground(Color.pink);
     p3.add(tx3);
     //p3.repaint();
     p3.setVisible(false);
        //f.repaint();
        f.setVisible(true);
    }
    

    
     public void actionPerformed(ActionEvent e) {
String a[] = {"http://hiphotos.baidu.com/baiweilu521/pic/item/2a8f411f84a6b3ee1ad57642.jpg","http://qhdcyts.tripc.com/thumb_scenic_images/5/200581711255331.jpg","http://www.59766.com/peruser/upic/200710/1/11610570.jpeg"};
        this.setPaths(a);
        //String []paths = pathss.split("|");
if(e.getSource()==bl)
{
JFileChooser chooser = new JFileChooser();
                
                             chooser.setCurrentDirectory(new File("C:\\Documents and Settings\\Administrator\\Desktop"));
                chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
                chooser.setAcceptAllFileFilterUsed(false);
                if (chooser.showOpenDialog(f) == JFileChooser.APPROVE_OPTION) { 
                    System.out.println("getCurrentDirectory(): " 
                       +  chooser.getCurrentDirectory());
                    System.out.println("getSelectedFile() : " 
                       +  chooser.getSelectedFile());
                    }
                  else {
                    System.out.println("No Selection ");
                    }
                
                file = chooser.getSelectedFile();//getCurrentDirectory();//.getSelectedFile();
                tx.setText(file.getPath());
}

else if(e.getSource()==bd)
{

String folderPath = tx.getText().trim();
                           
             File f3 = new File(folderPath);
             if(!f3.exists())
             {
             JOptionPane.showMessageDialog(null, "You choose the folder does not exist", "Warning", JOptionPane.ERROR_MESSAGE );
             }
             else{
             OutputStream out = null;
             URLConnection conn = null;
             InputStream  in = null;
            
            
             p3.setVisible(true);
             //p3.repaint();
             String s1 ="";
             String s2 ="";
            
             //tx3.repaint();
             f.repaint();
             String path ;
                 
             s2 = Integer.toString(paths.length);
             String s = s1 + " of " + s2 +" photos downlading...";
             //tx3.setText(s);
      System.out.println(s2);      
             for(int i=0;i<paths.length;i++ )
             {
            
             s1 = Integer.toString(i+1);
             s = s1 + " of " + s2 +" photos downlading...";
             //this.setSTxt(s);
             f.repaint();
      System.out.println(s1)  ; 
      System.out.println(s)  ; 
       p3.repaint();
       p3.setVisible(true);
             tx3.setText(s);
             //tx3.repaint();
             try {
             path = paths[i];
             URL urlPath = new URL(path);
             String filePath = urlPath.toString();
             int j = filePath.lastIndexOf("/");
             String fileName = filePath.substring(j+1, filePath.length());
             //String photoPath = folderPath +  fileName;
             //File f1 = new File(folderPath);
             File file = new File(folderPath  ,fileName);
             out = new BufferedOutputStream(
             new FileOutputStream(file));
            
             conn = urlPath.openConnection();
             in = conn.getInputStream();
             byte[] buffer = new byte[1024];
             int numRead;
             long numWritten = 0;
             while ((numRead = in.read(buffer)) != -1) {
             out.write(buffer, 0, numRead);
             numWritten += numRead;
             }            
             }catch (Exception e1) {

e1.printStackTrace();
             } finally
             {
             try {
             if (in != null) {
             in.close();
             }
             if (out != null) {
             out.close();
             }
             } catch (IOException ioe) {
             }              }
                          int b;   
                        
            
             if(i==paths.length-1)
             {
            
             JOptionPane.showMessageDialog(null, "Download images is completed!", "Message", JOptionPane.INFORMATION_MESSAGE );
             //System.exit(0);
             //tx3.setText("The download is completed!");
             //tx3.setText(s);
             }
             f.repaint();
             }
             System.exit(0);
             //JOptionPane.showMessageDialog(null, "Download images is completed!", "Message", JOptionPane.INFORMATION_MESSAGE );
             }
             f.repaint();
}

else if(e.getSource()==bc)
{
System.exit(0);
}

} 

public String[] getPaths() {
return paths;
}
public void setPaths(String[] paths) {
this.paths = paths;
} public String getPathss() {
return pathss;
} public void setPathss(String pathss) {
this.pathss = pathss;
}

public String getSTxt() {
return sTxt;
}
public void setSTxt(String txt) {
sTxt = txt;
}
}