springmvc缓存request
springmvc缓存request，设置到threadlocal
mvc框架DispatcherServlet与RequestContextHolder.getRequestAttributes()
https://www.cnblogs.com/zwh0910/p/17168833.html
RequestContextHolder.getRequestAttributes()的空指针问题收集/使用注意事项
https://developer.baidu.com/article/details/2766808
https://www.cnblogs.com/redos/p/14945483.html
https://www.cnblogs.com/sharpest/p/7476670.html
https://www.jianshu.com/p/3a3dc1c9bf4c
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