CODEWITHSUNDEEP
javajarant
Tobias Schäfer
Tobias Schäfer

Reputation: 1358

ANT Create jarfile

I want to build a jar file using ant. I have a resource folder in my project with files and folder beneath. Example:

Package---
             src
                    Main.java
             resources
                    images
                           logo.png

Inside the JAR file the images sould be accesible via ...File("resources/images/logo.png"); is that possible and if yes how?

I tried serveral options but could not figure out how it works. One of my attempts:

...    
<zipfileset dir="${dir.buildfile}/ressources/images" includes="*.png"/>
<zipfileset dir="${dir.buildfile}/ressources/images" includes="*.jpg"/>
...

This wasn't working...

Best regards!

Upvotes: 0

Views: 44

Answers (1)

Thomas
Thomas

Reputation: 17422

Here's a simple example. Let's say you have the following directory structure:

./Test.java
./Test.class
./resources/test.txt

where your source file accesses the file resources/test.txt like so:

import java.io.*;
import java.net.*;

public class Test {
    public void test() throws IOException, URISyntaxException {
        URL url = getClass().getResource("/resources/test.txt");

        try (BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()))) {
            for (String line; (line = br.readLine()) != null;) {
                System.out.println("> " + line);
            }
        }
    }

    public static void main(String[] args) throws Exception {
        Test test = new Test();
        test.test();
    }
}

Then the following ANT target will create a jar file that contains the .class file and the resources directory:

<target name="jar">
  <jar destfile="test.jar">  
    <fileset dir="." includes="Test.class"/>
    <fileset dir="." includes="resources/**"/>
  </jar>
</target>

You can verify that by running:

java -cp test.jar Test

Two things should be noted:

  1. The / at the beginning of the path in the getClass().getResource(...) call. This is important because otherwise the package name of the class would be prepended to the given path (although in the example above, Test.java does not have a package declaration).
  2. The '/**' part in the second fileset in the ANT task. Without that, only the directory itself (i.e., without any contained files) is added to your jar file.

Upvotes: 1

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