Test for ZipEntry's getMethod. (http://www.roseindia.net/tutorial/java/corejava/zip/ZipGetMethod.html)

gistfile1.txt

import java.util.*;
import java.util.zip.*;
import java.io.*;
import java.util.Enumeration;
import java.util.zip.ZipFile;
import java.util.zip.ZipEntry;

public class ZipGetMethod {
  public static void main(String[] args) {
    String file = "moby.zip";
    try {
      ZipFile zipfile = new ZipFile(file);
      Enumeration e = zipfile.entries();
      while (e.hasMoreElements()) {
        ZipEntry zipentry = (ZipEntry) e.nextElement();
        String entryName = zipentry.getName();
        Date lastModify = new Date(zipentry.getTime());
        long uncomSize = zipentry.getSize();
        long comSize = zipentry.getCompressedSize();

        if ((zipentry.getMethod()) == ZipEntry.STORED) {
          System.out.println("The entry  Nmae " + entryName
              + " was stored at " + lastModify);
          System.out.println("with a size of  " + uncomSize
              + " bytes");
          System.out.println(" ");
        } else if ((zipentry.getMethod()) == ZipEntry.DEFLATED) {
          System.out.println("The entry  Nmae " + entryName
              + " was deflated at " + lastModify);
          System.out.println("Uncompressed size of entry : "
              + uncomSize + " bytes");
          System.out.println("Compressed size of entry : " + comSize
              + " bytes");
          System.out.println(" ");
        } else {
          System.out.println("The entry  Nmae " + entryName
              + " was compressed, but method name not specified "
              + lastModify);
          System.out.println("Uncompressed size of entry : "
              + uncomSize + " bytes");
          System.out.println("Compressed size of entry : " + comSize
              + " bytes");
        }
      }
    } catch (IOException ex) {
      System.out.println("IOException is : " + ex);
    }

  }
}

Produces the following output on FOCUS-4685's moby.zip.

IOException is : java.util.zip.ZipException: invalid CEN header (bad compression method)