getResource() to a file at runtime

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As you already discovered yourself soon after posting your question, this works:

InputStream is = getClass().getResourceAsStream("/resources/file.txt");

The reason this works, while your original code doesn't, is because a "file" inside in a zip file (a jar file is a zip file) is not a real file until it has been extracted. But extracting the file is what you are trying to do, so at that point in your program, it's not a real file. So this question is an X-Y problem: you wanted to create a File object, but that wasn't possible - you needed to refer back to what you were originally trying to do, which was read from the zip entry.

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kenny
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kenny

Updated on June 04, 2022

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  • kenny
    kenny almost 2 years

    I put some .txt files under the src folder (in the resources folder).

    But I can't create a valid File at runtime from this resource.

    String path = this.getClass().getResource("/resources/file.txt").getFile();
    File file = new File(path);
    
    if (!file.exists()) {
    }
    

    I run my program from eclipse. I didn't put in classpath anything.
    I want my text files to be embedded into the .jar file, when I run my app I want to grab those files and copy them into some location.

    UPDATE

    if I do InputStream is = getClass().getResourceAsStream("/resources/file.txt");

    I get the stream!!