Java tutorial
//package com.java2s; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.util.zip.GZIPInputStream; public class Main { public static String decompress(String hexString) throws UnsupportedEncodingException { final byte[] byteArray = new byte[hexString.length() / 2]; int k = 0; for (int i = 0; i < byteArray.length; i++) { byte high = (byte) (Character.digit(hexString.charAt(k), 16) & 0xff); byte low = (byte) (Character.digit(hexString.charAt(k + 1), 16) & 0xff); byteArray[i] = (byte) (high << 4 | low); k += 2; } ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayInputStream in = new ByteArrayInputStream(byteArray); try { GZIPInputStream gunzip = new GZIPInputStream(in); byte[] buffer = new byte[256]; int n; while ((n = gunzip.read(buffer)) >= 0) { out.write(buffer, 0, n); } } catch (IOException e) { e.printStackTrace(); } return out.toString(); } }