Get current path of executed file

Question

I try to write and read to the file in my java project file called Books.txt. The problem is that I can access the file only if partialPath has full path to the file.

He

Answer 1

Here is a code snippet of the Drombler Commons - Client Startup code I wrote, to determine the location of the executable jar. Replace DromblerClientStarter with your main class. This should work at least when you're running your application as an executable JAR file.

/**
 * The jar URI prefix "jar:"
 */
private static final String FULL_JAR_URI_PREFIX = "jar:";
/**
 * Length of the jar URI prefix "jar:"
 */
private static final int FULL_JAR_URI_PREFIX_LENGTH = 4;

private Path determineMainJarPath() throws URISyntaxException {
    Class type = DromblerClientStarter.class;
    String jarResourceURIString = type.getResource("/" + type.getName().replace(".", "/") + ".class").toURI().
            toString();
    int endOfJarPathIndex = jarResourceURIString.indexOf("!/");
    String mainJarURIString = endOfJarPathIndex >= 0 ? jarResourceURIString.substring(0, endOfJarPathIndex)
            : jarResourceURIString;
    if (mainJarURIString.startsWith(FULL_JAR_URI_PREFIX)) {
        mainJarURIString = mainJarURIString.substring(FULL_JAR_URI_PREFIX_LENGTH);
    }
    Path mainJarPath = Paths.get(URI.create(mainJarURIString));
    return mainJarPath;
}

Depending on where you bundle Books.txt in your application distribution package, you can use this mainJarPath to determine the path of Books.txt.