JWT使用,参见:
1、https://www.jianshu.com/p/180a870a308a
2、https://auth0.com/learn/json-web-tokens/
3、https://jwt.io/introduction/
4、JJWT的使用:https://stormpath.com/blog/jjwt-how-it-works-why
https://auth0.com/resources/ebooks/jwt-handbook