Java Web Login Implementation method based on session _java

The example in this article describes the Java web based on session login implementation method. Share to everyone for your reference, specific as follows:

Package cn.com.login;
Import java.io.IOException;
Import Java.io.PrintWriter;
Import java.util.ArrayList;
Import java.util.List;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
  public class Login extends HttpServlet {private static final long serialversionuid = 1L;
    protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
    Response.setcharacterencoding ("UTF-8");
    Response.setcontenttype ("Text/html;charset=utf-8");
    String username=request.getparameter ("UserName");
    String password=request.getparameter ("password");
    PrintWriter Out=response.getwriter ();
    List<user> List=db.getall ();
      for (User user:list) {if (User.getusername (). Equals (UserName) &&user.getpassword (). Equals (password))
        {request.getsession (). setattribute ("user", user); RespOnse.sendredirect ("/session/index.jsp");
      return; } out.write ("User name or password error!)"
  "); 
    } protected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
  Doget (Request,response);
  } class Db {public static list<user> list=new ArrayList ();
    static {List.add (New User ("AAA", "123"));
    List.add (New User ("BBB", "123"));
  List.add (New User ("CCC", "123"));
  public static list<user> GetAll () {return List;
}} package Cn.com.login;
  public class User {private String userName;
  private String password;
    Public User () {super ();
    TODO auto-generated Constructor stub} public User (string userName, string password) {super ();
    This.username = UserName;
  This.password = password;
  Public String GetUserName () {return userName;
  } public void Setusername (String userName) {this.username = UserName; Public String GetPassword () {RETurn password;
  } public void SetPassword (String password) {this.password = password;
}} package Cn.com.login;
Import java.io.IOException;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
Import javax.servlet.http.HttpSession; /** * Servlet Implementation Class LogOut/public class LogOut extends HttpServlet {private static final long seria
  Lversionuid = 1L;
    protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
    HttpSession session=request.getsession (FALSE);
      if (session==null) {response.sendredirect ("/session/index.jsp");
    return;
    } session.removeattribute ("User");
  Response.sendredirect ("/session/index.jsp"); 
    } protected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException { Doget (Request,Response); }} <! DOCTYPE html>  

I hope this article will help you with your Java Web programming.