Java tutorial
//package com.java2s; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipInputStream; public class Main { public static void unzip(InputStream is, String dir) throws IOException { File dest = new File(dir); if (!dest.exists()) { dest.mkdirs(); } if (!dest.isDirectory()) throw new IOException("Invalid Unzip destination " + dest); if (null == is) { throw new IOException("InputStream is null"); } ZipInputStream zip = new ZipInputStream(is); ZipEntry ze; while ((ze = zip.getNextEntry()) != null) { final String path = dest.getAbsolutePath() + File.separator + ze.getName(); String zeName = ze.getName(); char cTail = zeName.charAt(zeName.length() - 1); if (cTail == File.separatorChar) { File file = new File(path); if (!file.exists()) { if (!file.mkdirs()) { throw new IOException("Unable to create folder " + file); } } continue; } FileOutputStream fout = new FileOutputStream(path); byte[] bytes = new byte[1024]; int c; while ((c = zip.read(bytes)) != -1) { fout.write(bytes, 0, c); } zip.closeEntry(); fout.close(); } } }