Java tutorial
//package com.java2s; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; public class Main { public static byte[] extract(InputStream inputStream) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int read = 0; while ((read = inputStream.read(buffer, 0, buffer.length)) != -1) { baos.write(buffer, 0, read); } baos.flush(); return baos.toByteArray(); } }