How to Call a Java Class with Parameters and Redirect Output from PowerShell

Описание: Learn how to effectively translate a batch script into PowerShell by calling a Java class with parameters and redirecting output.
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This video is based on the question https://stackoverflow.com/q/68934178/ asked by the user 'Yvain' ( https://stackoverflow.com/u/9300660/ ) and on the answer https://stackoverflow.com/a/68935827/ provided by the user 'Yvain' ( https://stackoverflow.com/u/9300660/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Translating Batch Scripts to PowerShell: Calling Java with Parameters

When working on scripts in different environments, translating one script from batch to PowerShell can often lead to confusion, especially when it involves complex commands. One common scenario is calling a Java class with parameters and redirecting that output. If you're coming from a batch scripting background, you might be wondering how to accurately perform these actions in PowerShell.

The Problem at Hand

You have a batch script that looks something like this:

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Your goal is to achieve the same functionality using PowerShell. You may have already tried various methods, such as using the call operator, Start-Process, or Start-Job with little success. Let's explore how to correctly translate your batch script command into PowerShell.

The Solution: Using Start-Process in PowerShell

The key to running Java from PowerShell while passing parameters and redirecting output lies in the Start-Process cmdlet, which is powerful and flexible for executing external processes.

Step-by-Step Breakdown

Define the Path to Java Executable: Start by specifying the path to your Java executable.

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Prepare the Arguments: Establish a list of arguments you want to pass to the Java class. You will need to format this string correctly for PowerShell.

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Run the Java Class with Output Redirection: Finally, use Start-Process, providing the executable, arguments, and redirecting the standard output.

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Final PowerShell Code

Putting this all together, your final PowerShell command will look like this:

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What's Happening Here?

Start-Process: This cmdlet starts a process on your system, and here it's managing the Java executable.

-ArgumentList: You pass all necessary arguments for your Java class in this list.

-RedirectStandardOutput: This parameter handles the output redirection, specifying where the output should be written.

-PassThru: This optionally allows you to get the process object, which can be useful for later manipulation.

-Wait: This makes your PowerShell script wait until the Java process completes before continuing.

Conclusion

Translating batch scripts to PowerShell may seem daunting at first, but with the right understanding of cmdlets like Start-Process, you can effectively call Java classes with parameters and manage output redirection seamlessly. By following the steps outlined above, you should be well on your way to executing your Java program from PowerShell with ease.

Now that you have this knowledge, feel free to tackle similar translations, confident in your ability to adapt batch scripts into PowerShell commands.