Additional: token; (don't read until you finish writing...)

explain ：

（0） Why did you write this blog ？： stay 【27： The third chapter ： Developing a pass service ：10：【 register / Sign in 】 Interface 】 in , When storing user session information , One of them we used utoken The name ;;; Obviously , Be aware that this may be the use of token;

          ● And for token, I've heard it before N Time , But I don't understand it very well ; therefore , Just write this blog , Let's briefly introduce token;

（1） I feel , For a better understanding of cookie、token The content such as , The content of the front end must be understood ;

（2） The project , We'll talk more about token stay 【 User login authentication 】 Specific use in ;

Prior to the start , Please be sure to look carefully 【Servlet And JSP Advanced five ： browser Cookie】、【Servlet And JSP Advanced five ： The user's session Session object 】、【Servlet And JSP Advanced six ：ServletContext Global object ;Java Web Summary of three scope objects ;】;

One ： Reference article 1： What exactly is token？？

Reference from 【 What exactly is token？？】, The author of this article is 【 Huzhuoyu 】;

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