基于MVC架构的Java项目实训

package Control; 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.swing.JOptionPane; import Function.Login; /** * 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#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); response.getWriter().append("Served at: ").append(request.getContextPath()); String username=request.getParameter("UserName"); String password=request.getParameter("Password"); Login log=new Login(); String un = null; String pw=null; if(username==null||password==null) { JOptionPane.showMessageDialog(null,"用户名或密码为空！！"); System.out.println("用户名或密码为空"); response.sendRedirect("UserLogin.jsp"); } else { try{ if(log.Verify_L(username)!=null) { un=log.Verify_L(username).getUserName(); pw=log.Verify_L(username).getPassword(); if(username.equals(un) && password.equals(pw)) { request.getSession().setMaxInactiveInterval(30*60); // 设置session失效时间（timeout），单位为秒 request.getSession().setAttribute("username", un); // 用户名和密码正确，保存登录信息(获得session与jsp网页稍有不同) JOptionPane.showMessageDialog(null,"登录成功！"); response.sendRedirect("Welcome.jsp"); } else { JOptionPane.showMessageDialog(null,"用户名或密码错误！"); response.sendRedirect("UserLogin.jsp"); // 用户名和密码错误，跳转到登录界面 } } else { JOptionPane.showMessageDialog(null,"用户不存在！"); response.sendRedirect("UserLogin.jsp"); } }catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.setCharacterEncoding("UTF-8"); doGet(request, response); } }