链接：https://www.nowcoder.com/questionTerminal/3f368578e43d48b1968d79b935d00972
来源：牛客网

1.     service方法是在servlet生命周期中的服务期，默认在HttpServlet类中实现，根据HTTP请求方法（GET、POST等），将请求分发到doGet、doPost等方法实现。
2.1   GenericServlet
抽象类给出了设计servlet的一些骨架，定义了servlet生命周期还有一些得到名字、配置、初始化参数的方法，其设计的是和应用层协议无关的。
2.2   doget/dopost与Http协议有关，是在
javax.servlet.http.HttpServlet 中实现的。
3.    doGet和doPost方法在HttpServlet类中实现，GenericServlet中实现了service()
4.    常说所有的请求都先由service方法处理，而javax.servlet.GenericServlet接口实现了javax.servlet.Servlet接口，且javax.servlet.http.HttpServlet
是 javax.servlet.GenericServlet 的子类。只有最先定义好了的service方法才可以处理所有的请求。
5.   Servlet是线程不安全的，在Servlet类中可能会定义共享的类变量，这样在并发的多线程访问的情况下，不同的线程对成员变量的修改会引发错误

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