How to Display an Indeterminate JProgressBar While Running a Batch File in the Background?

Display Indeterminate JProgressBar While Batch File Runs

Introduction

In this scenario, the requirement is to display an indeterminate JProgressBar while a batch file is executing in the background. The challenge lies in running multiple processes concurrently within Swing, as it is typically limited to a single process.

Solution Using SwingWorker

To address this, we can employ a SwingWorker class that executes the ProcessBuilder in a dedicated thread, allowing us to update the JProgressBar and display output concurrently with the ongoing process.

The code provided here includes methods to handle button actions for starting and stopping the background task. Additionally, it incorporates a JLabel to display status updates and a JTextArea to display the output of the batch file.

Custom SwingWorker Class (BackgroundTask)

The BackgroundTask class extends SwingWorker and overrides three primary methods:

1. doInBackground(): This method executes the batch file using ProcessBuilder and captures its output and exit status.
2. process(): Updates the JLabel with the current state and appends output to the JTextArea.
3. done(): Disables the stop button and re-enables the start button, while setting the JProgressBar to indeterminate.

By utilizing this approach, we achieve both progress indication and output display while the batch file is executing. This eliminates user confusion and provides a better user experience.

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