http://blog.csdn.net/cai_chinasoft/article/details/50608292
扫码如何判定是微信或是支付宝的调用
http://blog.csdn.net/summer_i/article/details/54908784
http://blog.csdn.net/pony_maggie/article/details/52312424
原文链接：https://www.f2er.com/javaschema/282925.html