Zipfile and zipinputstream code

Question

Hi!
I need to unzip something that is in a bytearrayoutputstream. Since zipfile and zipinputstream does not receive bytearrayoutputstream I thought of creating my own but I don't know how to do that. I need someone to help me with the code. I need a code not advice please.
All I know is that it should extend to zipfile .
Please help

Answer 1

** a simple unZIP tool
** ex.  java UnZip file.zip file1   to unzip file 1 from file.zip
**      java UnZip file.zip         to unzip file.zip
import java.io.*;
import java.util.*;
import java.util.zip.*;
import java.text.*;
class UnZip {
  public static void main(String args[]) throws IOException {
    InputStream in = new BufferedInputStream(new FileInputStream(args[0]));
    ZipInputStream zin = new ZipInputStream(in);
    ZipEntry e;
    while((e=zin.getNextEntry())!= null) {
      if (args.length > 1) {
        if (e.getName().equals(args[1])) {
           unzip(zin, args[1]);
           break;
       unzip(zin, e.getName());
    zin.close();
  public static void unzip(ZipInputStream zin, String s) throws IOException {
    System.out.println("unzipping " + s);
    FileOutputStream out = new FileOutputStream(s);
    byte [] b = new byte[512];
    int len = 0;
    while ( (len=zin.read(b))!= -1 ) {
      out.write(b,0,len);
    out.close();
Courtesy of : http://www.rgagnon.com/javadetails/java-0067.html and http://www.rgagnon.com/howto.html