ZipFileExtended.java

 
/**
 * ZipFileExtended.java
 *
 * @author  Artinsoft
 */
import java.io.*;
import java.util.zip.*;
import java.util.*;


public class ZipFileExtended extends java.util.zip.ZipFile{


    /** Extends the zip file class in order to provide aditional funtinality
     * for  decompressing  directories.

     *
     * @param zipName the name of the  zip file
     */
    public  ZipFileExtended(String zipName) throws java.io.IOException
    {
            super(zipName);

    }


    public void unZip(){
    //
   //Unzips the contents of the file
    try {
        for (Enumeration entries = this.entries(); entries.hasMoreElements();) {
            // Get the entry name
            ZipEntry e = ((ZipEntry)entries.nextElement());
            String fileName = e.getName();
            if(e.isDirectory()) {
              System.out.println("Creating directory: " + e.getName());
              (new File(e.getName())).mkdir();

              continue;
            }
            if (fileName != null){
                int lastIndex = java.lang.Math.max(fileName.lastIndexOf('/'), fileName.lastIndexOf('\\'));
                //if the file is in a directory, determine if the directory exists
                if (lastIndex>-1){
                    File d = new File(fileName.substring(0,lastIndex));
                    if (!d.exists()){
                        System.out.println("Creating directory: " + fileName.substring(0,lastIndex));
                        d.mkdirs();
                    }
                }
                System.out.println("Extracting: " + fileName);
                copyInputStream(this.getInputStream(e),
                new BufferedOutputStream(new FileOutputStream(e.getName())));
            }
        }

    } catch (Exception ioe) {
      System.err.println("Unhandled exception:");
      ioe.printStackTrace();
      return;
    }

    }


    /** Overrides the toString method
     * @return A printable list of the entries contained in the zip file.
     */
    public String toString()
    {
        String res = "";
        // Enumerate each entry
        for (Enumeration entries = this.entries(); entries.hasMoreElements();) {
            // Get the entry name
            res = res + ((ZipEntry)entries.nextElement()).getName() +"\n";
        }
        return res;
    }


  private static final void copyInputStream(InputStream in, OutputStream out)
  throws IOException
  {
    byte[] buffer = new byte[1024];
    int len;

    while((len = in.read(buffer)) >= 0)
      out.write(buffer, 0, len);

    out.close();
  }
}