从另一个目录运行JAR文件？

Question

I created a JAR file with my Java program. This piece of code will open a few files inside a dir "Test", which is in the same dir as the JAR file. Like this:

/
 -- program.jar
 -- /Test
     -- *

If I run via terminal with: java -jar program.jar, it runs perfectly. But if I run graphically (right clicking on the jar file and Open with OpenJDK...), it doesn't work properly. Just like if I ran from another directory.

Is it possible that when I run the JAR file graphically it's running from another directory?

By the way, I'm running on Ubuntu.

Answer 1

Yes, you will get another current working directory... There would be two solutions:

1) Find the cwd by doing this hack:

    public class Test {
        public static void main(String... args) { 

            ClassLoader cl = Test.class.getClassLoader();
            String f = cl.getResource("").getFile();

            File cwd = new File(f);

            if (cwd.toString().endsWith("!"))
                cwd = cwd.getParentFile();

            JOptionPane.showMessageDialog(null, cwd);
        }
    }

2) If the files under Test are static (does not change to often) the solution would be to package them inside the jar.

Answer 2

I'm not sure if this will help, but below is a link to similar JAR question.

Running jar file with source files in another directory