由于项目是采用java编写的，微信包括微信支付大都是php相关，于是微信支付官方文档对java的支持就不是很友好，在网上找了很多文章，基本上没有一篇是真正跑的通的，经过一番整理，先将java接入微信支付详细流程总结出来以便后续使用。(Because the project is written using Java, including WeChat WeChat payment is mostly related to PHP, so WeChat paid official document support for Java is not very friendly, on the Internet to find a lot of articles, basically no one is really run through, after finishing, Java first access WeChat payment detailed process summary out for later use.)