JAR Archives: Jar Lister : JarFile « File « Java Tutorial

1. Java Tutorial
2. File
3. JarFile

import java.io.IOException;
import java.util.Date;
import java.util.Enumeration;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;

public class Main {
  public static void main(String[] args) throws IOException {
    JarFile jf = new JarFile("a.jar");
    Enumeration e = jf.entries();
    while (e.hasMoreElements()) {
      JarEntry je = (JarEntry) e.nextElement();
      System.out.println(je.getName());
      long uncompressedSize = je.getSize();
      long compressedSize = je.getCompressedSize();
      long crc = je.getCrc();
      int method = je.getMethod();
      String comment = je.getComment();
      System.out.println(new Date(je.getTime()));
      System.out.println("from  " + uncompressedSize + " bytes to "+ compressedSize);
      if (method == ZipEntry.STORED) {
        System.out.println("ZipEntry.STORED");
      }
      else if (method == ZipEntry.DEFLATED) {
        System.out.println(ZipEntry.DEFLATED);
      }
      System.out.println("Its CRC is " + crc);
      System.out.println(comment);
      System.out.println(je.isDirectory());
      
      Attributes a = je.getAttributes();
      if (a != null) {
        Object[] nameValuePairs = a.entrySet().toArray();
        for (int j = 0; j < nameValuePairs.length; j++) {
          System.out.println(nameValuePairs[j]);
        }
      }
      System.out.println();
    }
  }
}