Java Task Progress Bars in Swing

问题

I need a very simple (skeletal) tutorial on progress bars for developing a GUI in Java. The progress bar can be "indeterminate" and ideally have an updateable text label.

Here is some skeletal code that I hope someone can expand upon just enough to get something working.

class MyFunView extends FrameView {

  // class vars and other stuff...

  @Action
  public void excitingButtonPressed() {

     /* I have n files to download */
     // Download file 1, set progress bar status to "downloading file 1"
     // ...
     // Download file n, set progress bar status to "downloading file 2"

  }

}

Basically, how and what do I wrap my download code in? (I understand there is some kind of subclass of Task required?)

Thanks much in advance.

EDIT:

We all only have so much precious time to be alive, and no approach can be done in as little code or time as I would have hoped, so I will not be using a progress bar.

回答1:

I need a very simple (skeletal) tutorial on progress bars for developing a GUI in Java.

How to Use Progress Bars
Concurrency in Swing
Initial Threads
Event Dispatch Thread
SwingWorker
examples here

回答2:

You can use SwingWorker in conjunction with a JProgressBar.

The other alternative is to execute your task (e.g. Runnable) and periodically update the JProgressBar. Beware though, that in Swing any UI manipulations have to be done on the EDT. SwingWorker has a nice property of taking care of this detail. Your own solution will have to use SwingUtilities.invokeLater,. for example:

SwingUtilities.invokeLater(new Runnable() {
    public void run() {
        progressBar.setValue(progressCounter++);
    }
});

Lot of code for a stupid thing, isn't it? Maybe the SwingWorker with a PropertyChangeListener is a better solution in the end...

来源：https://stackoverflow.com/questions/10422468/java-task-progress-bars-in-swing

标签

java

swing

jprogressbar