111111111111111111111111111111

package com.servlet; import com.valueBean.UserBean; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.*; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; @WebServlet("/loginServlet") public class LoginServlet extends HttpServlet{ private List<UserBean> userList = new ArrayList<>(); @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } @Override public void init() throws ServletException { super.init(); userList.add(new UserBean("user1","1111",1)); userList.add(new UserBean("user2","2222",2)); userList.add(new UserBean("user3","3333",3)); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String username = req.getParameter("username"); String password = req.getParameter("password"); HttpSession session = req.getSession(); if(username == null || password == null || username.equals("") || password.equals("")){ resp.sendRedirect("login.jsp"); return; } for (UserBean userBean : userList) { if (userBean.getUsername().equals(username) && userBean.getPassword().equals(password)) { session.setAttribute("userBaen",userBean); resp.sendRedirect("show.jsp"); } } } }