Upload a file located inside a jar

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I'm trying to upload a file located inside a jar. When I upload the file normally it works fine (which is expected because the file is on the file system) but when I package a jar with the file located inside it doesn't work. I've tried to use:

this.getClass().getClassLoader().getResource("big_bird.txt") //doesn't work

new File("big_bird.txt".toURI()) //doesn't work

this.getClass().getClassLoader().getResourceAsStream("big_bird.txt") //kinda work as in I see the path but I can't get the file

I need to be able to grab the file and upload it all while its inside the jar so can anyone give me some insight into how this can be done?

executable-jar java
1 Answers
  1. Read the file as a stream from the jar

InputStream in = getClass().getResourceAsStream("big_bird.txt");

  1. Create a temp file

File tempFile = File.createTempFile("big_bird", "txt");

  1. Write input stream to temp file
try (FileOutputStream outputStream = new FileOutputStream(tempFile)) {
    int read;
    byte[] bytes = new byte[1024];
    while ((read = in.read(bytes)) != -1) {
        outputStream.write(bytes, 0, read);
    }
}
  1. Now you can use/upload tempFile
user_17761320
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