1.看完就彻底懂了session和cookie

https://www.jianshu.com/p/25802021be63

2.Servlet的三大数据存放对象

https://www.jianshu.com/p/2aea943d7339

3. Jsp中的四个域对象

https://www.cnblogs.com/neuhao/p/7290570.html?utm_source=itdadao&utm_medium=referral