https://plynoi.com/2013/11/23/%e0%b8%a7%e0%b8%b4%e0%b8%98%e0%b8%b5%e0%b8%aa%e0%b8%a3%e0%b9%89%e0%b8%b2%e0%b8%87-json-message-%e0%b8%94%e0%b9%89%e0%b8%a7%e0%b8%a2-java/