JavaWeb商城项目（Day05）Web层（登录页面的html+Servlet程序）

程序员文章站 2022-07-10 17:44:27

登录的Servlet程序/** * @Author Li Weitong * @Date 2020/11/12 14:03 */public class LoginServlet extends HttpServlet { private UserService userService = new UserServiceImpl(); @Override protected void doPost(HttpServletRequest req, HttpServletRes...

登录的Servlet程序

/**
 * @Author Li Weitong
 * @Date 2020/11/12 14:03
 */
public class LoginServlet extends HttpServlet {
    private UserService userService = new UserServiceImpl();
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        /*
        1.获取输入的用户名和用户密码参数
        2.调用服务层登录方法，
                 如果未查询到返回空值
                    跳转到当前页面
                 否则
                    跳转到登录成功页面
         */
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        User loginUser = userService.login(new User(null, username, password, null));
        if (loginUser != null) {
            req.getRequestDispatcher("pages/user/login_success.html").forward(req,resp);
        }else {
            req.getRequestDispatcher("pages/user/login.html").forward(req,resp);
            // 在页面提示用户名或密码有误
            
        }
    }
}

当完成基本功能之后，如果我登录不成功，跳转到当前的页面后想让服务器回传数据提示用户，用到JSP技术。

登录页面 login.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>登录页面</title>
    <link rel="stylesheet" href="../../static/css/style.css">
    <script></script>
</head>
<body>
    <div id="login_header">
<!--        <img class="logo_img" alt="无法显示" src="" alt="">-->
    </div>

    <div class="login_banner">
        <div id="l_content">
            <span>欢迎登录</span>
        </div>
        <div id="content">
            <div class="login_form">
                <div class="login_box">
                    <div class="tit">
                        <h1>卡宾会员</h1>
                        <a href="regist.html">立即注册</a>
                    </div>

                    <div class="msg_cont">
                        <b></b>
                        <span class="errorMsg">请输入用户名和密码</span>
                    </div>
                    <div class="form">
                        <form action="http://localhost:8080/loginServlet" method="post">
                            <label>用户名称：</label>
                            <input type="text" name="username" class="itxt">
                            <br>
                            <br>
                            <label>用户密码：</label>
                            <input type="password" name="password" class="itxt">
                            <br>
                            <br>
                            <input id="sub_btn" type="submit" value="登录">
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>
    <div id="bottom">
        <span>
            程序彤卡宾商城.Copyright &copy;2020.11.12
        </span>
    </div>
</body>
</html>

登录成功跳转页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册成功页面</title>
    <link rel="stylesheet" href="../../static/css/style.css">
</head>
<body>
    <div class="bottom">

    </div>
    <div id="main">
        <h1>登录成功！<a href="">跳转到？</a></h1>
    </div>

    <div id="bottom">
        <span>卡宾商城.Copyright &copy;2020.11.12</span>
    </div>
</body>
</html>

本文地址：https://blog.csdn.net/m0_47119598/article/details/109643624

相关标签：商城项目 servlet html web

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