update history 2016-03-20 jars download http://pan.baidu.com/s/1dEzLMtN 2016-03-23 add excel reading and writting utils add random identify code picture in login page latest jars (add the jxl.jar) download http://pan.baidu.com/s/1kTY7q2V 2016-03-24 update the function of Classification query update query by real_name 2016-03-26 optimize exam.js add teacher entity,student entity,class entity update login funciton page 2016-03-30 optimize the bootstrap table, very simply to initialize and create a table BUG the delete js has something wrong