Java tutorial
//package com.java2s; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; public class Main { public static byte[] toByte(InputStream input) throws IOException { byte[] buf = new byte[1024]; int len = -1; ByteArrayOutputStream output = new ByteArrayOutputStream(); while ((len = input.read(buf)) != -1) { output.write(buf, 0, len); } byte[] data = output.toByteArray(); output.close(); input.close(); return data; } }