Java Web学生成绩管理系统（JSP+Servlet+JDBC+Dao）

package Controller; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import Dao.AdministratorDao; import Dao.StudentDao; import Dao.UserDao; import Model.Administrator; import Model.Student; import Model.User; /** * Servlet implementation class LoginServlet */ public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); String username = request.getParameter("username"); String password = request.getParameter("password"); String identity = request.getParameter("identity"); String autoLogin = request.getParameter("autologin"); String checkCode = request.getParameter("check_code"); String savedCode = (String) request.getSession().getAttribute("check_code"); System.out.println(username + " " + password + " " + checkCode + " " + savedCode + " " + identity); if(username != null && password != null){ System.out.println("账号密码不为空"); //账号密码不为空 if(checkCode.equals(savedCode)) { //验证码正确 System.out.println("验证码正确"); if(identity !=null) { if(identity.equals("admin")){ //教师 try{ System.out.println("进入教师"); AdministratorDao adminDao = new AdministratorDao(); Administrator admin = adminDao.find(username); if (admin != null){ if (admin.getTcPassword().equals(password)) { System.out.println("ok"); function1(username, password, autoLogin, 1, request, response); } } else { request.setAttribute("errerMsg", "没有该教师"); request.getRequestDispatcher("/Jsp/Login.jsp").forward(request, response); } } catch (Exception ee) { ee.printStackTrace(); } } else if (identity.equals("student")){ //学生 try{ System.out.println("进入学生"); StudentDao stuDao = new StudentDao(); Student student = stuDao.find(username); if (student != null) { if (student.getStuPassword().equals(password)){ System.out.println("ok"); function1(username, password, autoLogin, 2, request, response); } } else { request.setAttribute("errerMsg", "没有该学生"); request.getRequestDispatcher("/Jsp/Login.jsp").forward(request, response); } } catch (Exception ee) { ee.printStackTrace(); } } } else { request.setAttribute("errerMsg", "身份为空"); request.getRequestDispatcher("/Jsp/Login.jsp").forward(request, response); } } else { //验证不正确 request.setAttribute("errerMsg", "验证码错误"); request.getRequestDispatcher("/Jsp/Login.jsp").forward(request, response); } } else { //账号或密码为空 request.setAttribute("errerMsg", "用户名或密码不能为空"); request.getRequestDispatcher("/Jsp/Login.jsp").forward(request, response); } } private void function1(String username, String password, String autoLogin, int num, HttpServletRequest request, HttpServletResponse response) throws IOException{ //将用户状态user对象存入session域 User user = new User(); user.setUsername(username); user.setPassword(password); if (num == 1) { user.setIdentity("admin"); } else if (num ==2) { user.setIdentity("student"); } request.getSession().setAttribute("user", user); //登陆记录 UserDao userDao = new UserDao(); userDao.insert(user); //发送自动登陆的cookie if(autoLogin != null){ //注意cookie中的密码要加密 if(num == 1){ Cookie cookie = new Cookie("autologin", username + "-" + password + "-" + "1"); cookie.setMaxAge(Integer.parseInt(autoLogin)); cookie.setPath(request.getContextPath()); response.addCookie(cookie); }else if (num == 2){ Cookie cookie = new Cookie("autologin", username + "-" + password + "-" + "2"); cookie.setMaxAge(Integer.parseInt(autoLogin)); cookie.setPath(request.getContextPath()); response.addCookie(cookie); } } if (num == 1) { //教师 //跳转至首页 response.sendRedirect(request.getContextPath() + "/Jsp/Admin.jsp"); } else if (num == 2){ //学生 //跳转至首页 response.sendRedirect(request.getContextPath() + "/Jsp/Student.jsp"); } } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }