Access file in jar file?

You could use something like this:

InputStream is = this.getClass().getClassLoader().getResourceAsStream(fileFromJarFile);

If foo.txt was in the root of your JAR file, you'd use:

InputStream is = this.getClass().getClassLoader().getResourceAsStream("foo.txt");

assumes the class is in the same JAR file as the resource, I believe.

You can use getResource() to obtain a URL for a file on the classpath, or getResourceAsStream() to get an InputStream instead.

For example:

BufferedReader reader = new BufferedReader(new InputStreamReader(
    this.getClass().getResourceAsStream("foo.txt")));

You could read the contents of a JAR file using the JarFile class.

Here's an example of how you could get a specific file from a JAR file and extract it:

JarFile jar = new JarFile("foo.jar");
String file = "file.txt";
JarEntry entry = jar.getEntry(file);
InputStream input = jar.getInputStream(entry);
OutputStream output = new FileOutputStream(file);
try {
    byte[] buffer = new byte[input.available()];
    for (int i = 0; i != -1; i = input.read(buffer)) {
        output.write(buffer, 0, i);
    }
} finally {
    jar.close();
    input.close();
    output.close();
}

Access file in jar file?

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