change hibernate mapping from xml to annotation.
the function of use hibernate one two many to presisent ot_level2, ot_level2_his, ot_level3 and ot_type always get "no session" error, so i remove the forign key relation of those, I will resolve this later.
add the feature of real time show ot distribution, use jquery flot plug.
the feature is not done.
添加接收一级OT并入库的功能，一级OT没有显示在网页上。