Friendpaste

package zip.simple;

import com.jcraft.jzlib.ZStream;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

/**
 * @author Romain Manni-Bucau
 */
public class Main {
    public static void main(String[] a) {
        final String filename = "/home/rmannibucau/Bureau/openejb-core-3.1.4.jar";
        final int nTimes = 100;

        long start = 0, end = 0;
        List<String> list = new ArrayList<String>();

        // jdk way: jar
        for (int i = 0; i < nTimes; i++) {
            list.clear();

            try {
                JarInputStream jarFile = new JarInputStream(new FileInputStream(filename));
                JarEntry jarEntry;

                start = System.nanoTime();
                while ((jarEntry = jarFile.getNextJarEntry()) != null) {
                    if (jarEntry.getName().endsWith(".class")) {
                        list.add(jarEntry.getName().replaceAll("/", "\\."));
                    }
                }
                end = System.nanoTime();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        System.out.println(TimeUnit.NANOSECONDS.toMillis(end - start) + " for " + list.size() + " classes ");

        // jdk way: zip
        for (int i = 0; i < nTimes; i++) {
            list.clear();

            try {
                ZipFile zipFile = new ZipFile(filename);
                Enumeration<? extends ZipEntry> zipEntries = zipFile.entries();

                start = System.nanoTime();
                while (zipEntries.hasMoreElements()) {
                    ZipEntry entry = zipEntries.nextElement();
                    if (entry.getName().endsWith(".class")) {
                        list.add(entry.getName().replaceAll("/", "\\."));
                    }
                }
                end = System.nanoTime();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        System.out.println(TimeUnit.NANOSECONDS.toMillis(end - start) + " for " + list.size() + " classes ");
    }
}