Java tutorial
//package com.java2s; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; public class Main { public static byte[] getBytes(Object obj) throws IOException { ByteArrayOutputStream bout = new ByteArrayOutputStream(); ObjectOutputStream out = new ObjectOutputStream(bout); out.writeObject(obj); out.flush(); byte[] bytes = bout.toByteArray(); bout.close(); out.close(); return bytes; } }