Updation of ProgressBar??

[Bikash Paul]

Hi all friends,
Iam facing problem with updation of progressBar of my swing Interface.I want to update my progressBar by the bytes which is already written by server on destination.It is basically a uploading software.For that iam using a thread and i have written a method of taking the bytes from servlet.And in servlet iam writting bytes by 'PrintWriter' in loop.But I couldn't update progressBar.Can any one plz guide me where i am wrong in my code.If possible plz give me some code for that.Iam pasting those portion of codes only.Eagerly waiting for someone reply.

In servlet:-
==========
PrintWriter out=response.getWriter();
for(cc = dis.read(buf, 0, 1024); cc > 0 ; cc = dis.read(buf, 0, 1024)) 
{
if(checkpath.exists()){
os.write(buf, 0, cc); 
tot += cc;
out.println(tot); 
if (str.equals(str1)) break;
}
else{
out.println("Connection Broken");
break;
}
Swing interface:-
===============
public static void updateprogress(){     
int ln;
int tot=0;
String str;
try{       
    BufferedReader input = new BufferedReader (new InputStreamReader(con.getInputStream ()));
while ((str=input.readLine())!=null)
{
ln=Integer.parseInt(str);                    
tot += ln;
progressBar.setValue(tot); 
}input.close();
}
catch(Exception exp) {
System.out.println("Error:" + exp.toString());
} 
}
And Iam calling this method in my another method through which iam uploading file.
myThread1 = new Thread (){
public void run () {
while (true) {
updateprogress();                     
try{
this.sleep (10000);             
}
catch(Exception nx){}
}      
}
};       
myThread1.start();

Regards
Bikash

[Michael Morris]

The problem is that swing components are not thread safe. You should never change the state of a swing component except in the swing dispatcher thread. You can use a javax.swing.Timer to do it like this:

class Updater implements ActionListener {
    private javax.swing.Timer timer;
    private boolean running;
    
    public Updater(int delay) {
        timer = new javax.swing.Timer(delay, this);
        running = true;
    }
    
    public void start() {
        timer.start();
    }
    
    public void stop() {
        timer.stop();
    }
    
    public void actionPerformed(ActionEvent e) {
        updateprogress();
    }
}

Updater u = new Updater(10000);
u.start();

Moving this to the Swing forum.