The life cycle of the servlet

1. Create a Servlet object, create a Servlet object from the server reflection mechanism, and for the first time,

Created when you request it. Default

2, call the Servlet object's init () method, initialize the servlet's information, and the Init () method will only be called once after it is created;

3, responding to requests, invoking service () or doget (), DoPost () methods to handle requests, these methods are running in multithreaded state.

4, the Destroy () method is called to destroy the Servlet object when it has not been called for a long time or when the server is shut down.

Test Case:

1  PackageCom.damu.servlet;2 3 ImportCom.damu.dao.UsersDAO;4 Importcom.damu.entity.Users;5 6 Importjavax.servlet.ServletException;7 ImportJavax.servlet.annotation.WebServlet;8 ImportJavax.servlet.http.HttpServlet;9 Importjavax.servlet.http.HttpServletRequest;Ten ImportJavax.servlet.http.HttpServletResponse; One Importjava.io.IOException; A Importjava.util.Date; -  -@WebServlet ("/addusers") the  Public classUsersaddservletextendsHttpServlet { -  -     PrivateUsersdao Usersdao =NewUsersdao (); - @Override +     protected voidDoget (httpservletrequest req, HttpServletResponse resp)throwsservletexception, IOException { -          This. DoPost (req, resp); +     } A  at @Override -     protected voidDoPost (httpservletrequest req, HttpServletResponse resp)throwsservletexception, IOException { -         //get the user data to add -String username = req.getparameter ("username"); -String Userpass = Req.getparameter ("Userpass"); -String nickname = Req.getparameter ("nickname"); inString age = req.getparameter (' Age '); -String gender = Req.getparameter ("Gender"); toString email = req.getparameter ("email"); +String phone = req.getparameter ("Phone"); -  the         //Create a User object based on user data *Users user =NewUsers (username, Userpass, nickname, Integer.parseint (age), gender, email, phone,NewDate (),NewDate (),NewDate (), 0); $ Panax Notoginseng         //to add a user object to the database -user =usersdao.adduser (user); the  +         //view newly added user data AResp.sendredirect ("/detail?id=" +User.getid ()); the     } +}

The life cycle of the servlet