如何在SftpProgressMonitor实例中使用现有的JProgressBar？

Question

I am writing a program that downloads a file from a server using SFTP. I'd like to have a progress bar on the program that reflects the download progress. Here is my current code for the progress monitor:

public class SystemOutProgressMonitor implements SftpProgressMonitor
{
    public SystemOutProgressMonitor() {;}

    public void init(int op, java.lang.String src, java.lang.String dest, long max) 
    {
        System.out.println("STARTING: "+op+" "+src+" -> "+dest+" total: "+max);
    }

    public boolean count(long bytes)
    {
        for(int x=0;x<bytes;x++) {
            System.out.println("#");
        }
        return(true);
    }

    public void end()
    {
        System.out.println("\nFINISHED!");
    }
}

This works fine for outputting to the console, however, I do not know how to pass the existing progress bar variable to this.

The JProgressBar that I am using resides in my Menu.java class, in this class there is a download button that calls the corresponding download method in my Sftp.java class, from there, the SystemOutProgressMonitor is called by:

sftpChannel.get(target, destination, new SystemOutProgressMonitor());

So would I pass the progress bar from Menu.java to Sftp.java, and then to SystemOutProgressMonitor?

Answer 1

Take a look at ProgressMonitor

Otherwise you'll need a SwingWorker or use SwingUtilities.invokeLater to ensure that the updates to the JProgressBar are synchronized to the Event Dispatching Thread correctly.

Take a look at:

• Concurrency in Swing
• Worker Threads and SwingWorker
• How to Use Progress Bars

for more details