dump .class lists in a .jar file

dumpJarClasses.java

/*
 * via http://stackoverflow.com/questions/15720822/how-to-get-names-of-classes-inside-a-jar-file
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;
import java.util.Properties;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class dumpJarClasses {
	public static void main(String[] args) throws FileNotFoundException, IOException {
		if (args.length <= 0) {
			System.out.println("please provide at least one .jar file");
			System.exit(1);
		}
		for (int i = 0; i < args.length; i++) {
			String pathParts[] = args[i].split(File.separator);
			String fileName = pathParts[pathParts.length - 1];
			List<String> classNames = new ArrayList<String>();
			ZipInputStream zip = new ZipInputStream(new FileInputStream(args[i]));
			for (ZipEntry entry = zip.getNextEntry(); entry != null; entry = zip.getNextEntry()) {
				if (!entry.isDirectory() && entry.getName().endsWith(".class")) {
					// This ZipEntry represents a class. Now, what class does it represent?
					String className = entry.getName().replace('/', '.'); // including ".class"
					classNames.add(className.substring(0, className.length() - ".class".length()));
				}
			}
			Iterator<String> classNamesIter = classNames.iterator();
			while (classNamesIter.hasNext()) {
				//System.out.println(fileName + " : " + classNamesIter.next());
				System.out.println(args[i] + " : " + classNamesIter.next());
			}
		}
		System.exit(0);
	}
}