IGeekShop案例10-用户登录基本功能的实现

ゝ一纸荒年。 2024-04-17 14:11 31阅读 0赞

# IGeekShop案例10-用户登录基本功能的实现 #

## 1 login.jsp代码 ##

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>会员登录</title>
    <link rel="stylesheet" href="css/bootstrap.min.css" type="text/css" />
    <script src="js/jquery-1.11.3.min.js" type="text/javascript"></script>
    <script src="js/bootstrap.min.js" type="text/javascript"></script>
    
    <link rel="stylesheet" href="css/style.css" type="text/css" />
    
    <style>
    body {
        margin-top: 20px;
        margin: 0 auto;
    }
    
    .carousel-inner .item img {
        width: 100%;
        height: 300px;
    }
    
    .container .row div {
        /* position:relative;
                     float:left; */
        
    }
    
    font {
        color: #666;
        font-size: 22px;
        font-weight: normal;
        padding-right: 17px;
    }
    </style>
    
    <script type="text/javascript">
        function changeImg(obj) {
            obj.src="${pageContext.request.contextPath }/checkImg?time="+new Date().getTime();
        }
        
    </script>
    
    </head>
    <body>
    
        
        <jsp:include page="/header.jsp"></jsp:include>
    
    
        <div class="container"
            style="width: 100%; height: 460px; background: #FF2C4C url('images/loginbg.jpg') no-repeat;">
            <div class="row">
                <div class="col-md-7">
                    
                </div>
    
                <div class="col-md-5">
                    <div
                        style="width: 440px; border: 1px solid #E7E7E7; padding: 20px 0 20px 30px; border-radius: 5px; margin-top: 60px; background: #fff;">
                        <font>会员登录</font>USER LOGIN
                        <div id="checkCodeInfo" style="color:red">${loginInfo}</div>
                        <form class="form-horizontal" action="${pageContext.request.contextPath }/login" method="post">
                            <div class="form-group">
                                <label for="username" class="col-sm-2 control-label">用户名</label>
                                <div class="col-sm-6">
                                    <input type="text" class="form-control" id="username" name="username"
                                        placeholder="请输入用户名">
                                </div>
                            </div>
                            <div class="form-group">
                                <label for="inputPassword3" class="col-sm-2 control-label">密码</label>
                                <div class="col-sm-6">
                                    <input type="password" class="form-control" id="inputPassword3" name="password"
                                        placeholder="请输入密码"> 
                                </div>
                            </div>
                            <div class="form-group">
                                <label for="inputPassword3" class="col-sm-2 control-label">验证码</label>
                                <div class="col-sm-3">
                                    <input type="text" class="form-control" id="inputPassword3" name="checkCode"
                                        placeholder="请输入验证码">
                                </div>
                                <div class="col-sm-3">
                                    <img src="${pageContext.request.contextPath }/checkImg" onclick="changeImg(this)"/>
                                </div>
                            </div>
                            <div class="form-group">
                                <div class="col-sm-offset-2 col-sm-10">
                                    <div class="checkbox">
                                        <label> <input type="checkbox"> 自动登录
                                        </label>      <label> <input
                                            type="checkbox"> 记住用户名
                                        </label>
                                    </div>
                                </div>
                            </div>
                            <div class="form-group">
                                <div class="col-sm-offset-2 col-sm-10">
                                    <input type="submit" width="100" value="登录" name="submit"
                                        style="background: url('./images/login.gif') no-repeat scroll 0 0 rgba(0, 0, 0, 0); height: 35px; width: 100px; color: white;">
                                </div>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    
        
        <jsp:include page="/footer.jsp"></jsp:include>
    
    </body>
    </html>

## 2 web层LoginServlet ##

package www.test.web.servlet;
    
    import java.io.IOException;
    import java.sql.SQLException;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import www.test.domain.User;
    import www.test.service.LoginService;
    
    public class LoginServlet extends HttpServlet {
    
        public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
            // 解决乱码问题
            request.setCharacterEncoding("UTF-8");
    
            // 获得页面输入的验证
            String checkCode_client = request.getParameter("checkCode");
            // 获得生成图片的文字的验证码
            String checkCode_session = (String) request.getSession().getAttribute("checkcode_session");
            // 比对页面的和生成图片的文字的验证码是否一致
            if (!checkCode_session.equals(checkCode_client)) {
                request.setAttribute("loginInfo", "您的验证码不正确");
                request.getRequestDispatcher("/login.jsp").forward(request, response);
                return;
            }
            // 获取用户输入的数据
            String username = request.getParameter("username");
            String password = request.getParameter("password");
    
            LoginService service = new LoginService();
            User user = null;
            try {
                user = service.findUser(username, password);
            } catch (SQLException e) {
    
                e.printStackTrace();
            }
    
            if (user != null) {
                response.sendRedirect("/WEBTest24/index.jsp");
            } else {
                request.setAttribute("loginInfo", "密码或者用户名不正确");
                request.getRequestDispatcher("/login.jsp").forward(request, response);
            }
        }
    
        public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            doGet(request, response);
        }
    }

## 3 service层 ##

package www.test.service;
    
    import java.sql.SQLException;
    
    import www.test.dao.LoginDao;
    import www.test.domain.User;
    
    public class LoginService {
    
        public User findUser(String username, String password) throws SQLException {
            LoginDao dao = new LoginDao();
            return dao.findUser(username,password);
        }
    
    }

## 4 dao层 ##

package www.test.dao;
    
    import java.sql.SQLException;
    
    import org.apache.commons.dbutils.QueryRunner;
    import org.apache.commons.dbutils.handlers.BeanHandler;
    
    import www.test.domain.User;
    import www.test.utils.C3P0Utils;
    
    public class LoginDao {
    
        public User findUser(String username, String password) throws SQLException {
            QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
            String sql = "select * from user where username =? and password = ?";
            return qr.query(sql, new BeanHandler<User>(User.class), username,password);
            
        }
    
    }