How to list the files inside a JAR file?

Question

I have this code which reads all the files from a directory.

    File textFolder = new File(\"text_directory\");

    File [] texFiles = textFolder.listFiles         


        

Answer 1

Here is an example of using Reflections library to recursively scan classpath by regex name pattern augmented with a couple of Guava perks to to fetch resources contents:

Reflections reflections = new Reflections("com.example.package", new ResourcesScanner());
Set paths = reflections.getResources(Pattern.compile(".*\\.template$"));

Map templates = new LinkedHashMap<>();
for (String path : paths) {
    log.info("Found " + path);
    String templateName = Files.getNameWithoutExtension(path);
    URL resource = getClass().getClassLoader().getResource(path);
    String text = Resources.toString(resource, StandardCharsets.UTF_8);
    templates.put(templateName, text);
}

This works with both jars and exploded classes.