1 创建servlet
/** * 处理用户登录请求 */ @WebServlet("/login.do") public class UserLoginServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doPost(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String username = req.getParameter("username"); String userpwd = req.getParameter("userpwd"); try { UserLoginService userLoginService = new UserLoginServiceImpl(); Users users = userLoginService.userLogin(username, userpwd); //建立客户端与服务端的会话状态 HttpSession session = req.getSession(); session.setAttribute(Constants.USER_SESSION_KEY, users); //跳转首页 使用重定向 可以改变地址页url resp.sendRedirect("main.jsp"); } catch (UserNotFoundException e) { req.setAttribute("msg", e.getMessage()); req.getRequestDispatcher("login.jsp").forward(req, resp); } catch (Exception e) { resp.sendRedirect("error.jsp"); } } }
也就是一开始登录页面from表单提交的账号，密码进行接收。
2 主页设计
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2020/7/6 0006 Time: 12:11 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>信息管理系统界面</title> </head> <frameset rows="*,31" cols="*" frameborder="no" border="0" framespacing="0"> <frameset cols="187,*" frameborder="no" border="0" framespacing="0"> <frame src="left.jsp" name="leftFrame" scrolling="No" noresize="noresize" id="leftFrame" title="leftFrame" /> <frame src="index.jsp" name="rightFrame" id="rightFrame" title="rightFrame" /> </frameset> <frame src="footer.jsp" name="bottomFrame" scrolling="No" noresize="noresize" id="bottomFrame" title="bottomFrame" /> </frameset> <noframes><body> </body></noframes> </html>
3 测试结果
输入错误密码
输入正确账号密码
4 不足之处
当用户不登录其实也可以访问我们的后台，这时候需要写一个过滤器进行拦截
