jsonStreamFromInputStream provides a solution of
getting jsonObject or jsonArray via tcp or other inputstream steadily.
JsonReader class
provides a simple implement which can constantly get jsonObject or jsonArray from InputStream.
Main.java is a example
可以从InputStream中连续获得json对象。当然，它是同步的，不安全的（因为我菜）
2018.06.13
now i hava a thread
but can't be stopped