实验四 JavaBean及Servlet使用源代码

package servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import util.DaoFactory; /** * Servlet implementation class LoginServlet */ @WebServlet("/LoginServlet") public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public LoginServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String stuno = request.getParameter("stuno"); String password = request.getParameter("password"); String stuname = DaoFactory.getUserDaoImpl().getUser(stuno, password); if(stuname != null) { //登录成功 request. setAttribute("stuname", stuname); request.getSession().setAttribute("msg",""); //页面的跳转第一种方式转发 request. getRequestDispatcher("result.jsp").forward(request, response); } else { //登录失败 //页面的跳转第二种重定向 // HttpSession session = request.getSession(); // session.setAttribute("msg","你的学号或者密码有误，请重新输入"); // 链式调用 request.getSession().setAttribute("msg","你的学号或者密码有误，请重新输入"); response.sendRedirect("index.jsp"); } } }