标签：info 登录 resp User 旅游网 import servlet 黑马 user

综合案例-黑马旅游网_登录功能

分析

实现_Loginservlet

package com.bai.web.servlet;

import com.bai.domain.ResultInfo;
import com.bai.domain.User;
import com.bai.service.UserService;
import com.bai.service.impl.UserServiceImpl;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.beanutils.BeanUtils;

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 java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //验证校验
        String check = req.getParameter("check");
        //从session中获取
        HttpSession session = req.getSession();
        String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
        session.removeAttribute("CHECKCODE_SERVER");//保证验证码只能使用一次
        //比较
        if (checkcode_server==null || !checkcode_server.equalsIgnoreCase(check)){
            //验证码错误
            ResultInfo info = new ResultInfo();
            //注册失败
            info.setFlag(false);
            info.setErrorMsg("注册失败!");
            //将info对象序列化为json
            ObjectMapper mapper = new ObjectMapper();
            String json = mapper.writeValueAsString(info);
            //将json数据写回客户端
            //设置content-type
            resp.setContentType("application/json;charset=utf-8");
            resp.getWriter().write(json);
            return;
        }
        //获取用户名和密码数据
        Map<String,String[]> map=req.getParameterMap();
        //封装User对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        //调用Service查询
        UserServiceImpl service = new UserServiceImpl();
        User u=service.login(user);
        ResultInfo info = new ResultInfo();

        //判断用户对象是否为null
        if (u==null){
            //用户名或密码错误
            info.setFlag(false);
            info.setErrorMsg("用户名或密码错误");
        }
        //判断用户是否激活
        if (u!=null && !"Y".equals(u.getStatus())){
            //用户尚未激活
            info.setFlag(false);
            info.setErrorMsg("您尚未激活 请激活");
        }
        //判断登录成功
        if (u!=null && "Y".equals(u.getStatus())){
            //登录成功
            info.setFlag(true);
        }
        //响应数据
        ObjectMapper mapper = new ObjectMapper();

        resp.setContentType("application/json;charset=utf-8");
        mapper.writeValue(resp.getOutputStream(),info);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

实现service代码

UserService接口

//登录
User login(User user);

UserServiceImpl实现类

 /**
     * 登录方法
     * @param user
     * @return
     */
    @Override
    public User login(User user) {
        return userDao.findByUsernameAndPassword(user.getUsername(),user.getPassword());
    }
}

实现Dao代码

UserDao接口

 //根据用户名和密码查询
    User findByUsernameAndPassword(String username, String password);

UserDaoImpl实现类

 @Override
    public User findByUsernameAndPassword(String username, String password) {
        User user= null;
        try {
            //定义sql
            String sql="select * from tab_user where username=? and password=?";
            //执行sql
            user = template.queryForObject(sql,new BeanPropertyRowMapper<User>(User.class),username,password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return user;
    }
}

前端代码实现

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>黑马旅游网-登录</title>  
    <link rel="stylesheet" type="text/css" href="css/common.css">
    <link rel="stylesheet" type="text/css" href="css/login.css">
    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="https://cdn.bootcss.com/html5shiv/3.7.3/html5shiv.min.js"></script>
      <script src="https://cdn.bootcss.com/respond.js/1.4.2/respond.min.js"></script>
    <![endif]-->
      <!--导入angularJS文件-->
    <!--<script src="js/angular.min.js"></script>-->
    <!--导入jquery-->
    <script src="js/jquery-3.3.1.js"></script>

    <script>
        $(function () {
            //给登录按钮绑定单击事件
            $("#btn_sub").click(function () {
                //发送ajax请求 提交表单数据
                $.post("loginServlet",$("#loginForm").serialize(),function (data) {
                    if (data.flag){
                        //登录成功
                        location.href="index.html";
                    }else{
                        //登录失败
                        $("#errorMsg").html(data.erroMsg);
                    }
                })
            })
        })
    </script>
</head>

<body>
<!--引入头部-->
<div id="header"></div>
    <!-- 头部 end -->
    <section id="login_wrap">
        <div class="fullscreen-bg" style="background: url(images/login_bg.png);height: 532px;">
            
        </div>
        <div class="login-box">
            <div class="title">
                <img src="images/login_logo.png" alt="">
                <span>欢迎登录黑马旅游账户</span>
            </div>
            <div class="login_inner">
                
                <!--登录错误提示消息-->
                <div id="errorMsg" class="alert alert-danger" ></div>
                <form id="loginForm" action="" method="post" accept-charset="utf-8">
                    <input type="hidden" name="action" value="login"/>
                    <input name="username" type="text" placeholder="请输入账号" autocomplete="off">
                    <input name="password" type="text" placeholder="请输入密码" autocomplete="off">
                    <div class="verify">
                    <input name="check" type="text" placeholder="请输入验证码" autocomplete="off">
                    <span><img src="checkCode" alt="" onclick="changeCheckCode(this)"></span>
                    <script type="text/javascript">
                        //图片点击事件
                        function changeCheckCode(img) {
                            img.src="checkCode?"+new Date().getTime();
                        }
                    </script>
            </div>
            <div class="submit_btn">
                        <button type="button"  id="btn_sub">登录</button>
                        <div class="auto_login">
                            <input type="checkbox" name="" class="checkbox">
                            <span>自动登录</span>
                        </div>                        
                    </div>                                   
                </form>
                <div class="reg">没有账户？<a href="javascript:;">立即注册</a></div>
            </div>
        </div>
    </section>
    <!--引入尾部-->
    <div id="footer"></div>
    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
    <script src="js/jquery-1.11.0.min.js"></script>
    <!-- Include all compiled plugins (below), or include individual files as needed -->
    <script src="js/bootstrap.min.js"></script>
    <!--导入布局js，共享header和footer-->
    <script type="text/javascript" src="js/include.js"></script>
</body>

</html>

index页面中用户姓名的提示信息

前端代码

<!-- 头部 start -->
<script>
    $(function () {
       $.get("findUserServlet",{},function (data) {
           //{uid:1,name:'李四'}
           var msg = "欢迎回来，"+data.name;
           $("#span_username").html(msg);

       }); 
    });

</script>

<header id="header">
        <div class="top_banner">
            <img src="images/top_banner.jpg" alt="">
        </div>
        <div class="shortcut">
            <!-- 未登录状态  -->
            <div class="login_out">
                <a href="login.html">登录</a>
                <a href="register.html">注册</a>
            </div>
            <!-- 登录状态  -->
            <div class="login">
                
                <span id="span_username"></span>
                <a href="myfavorite.html" class="collection">我的收藏</a>
                <a href="javascript:location.href='exitServlet';">退出</a>
            </div>
        </div>
        <div class="header_wrap">
            <div class="topbar">
                <div class="logo">
                    <a href="/"><img src="images/logo.jpg" alt=""></a>
                </div>
                <div class="search">
                    <input name="" type="text" placeholder="请输入路线名称" class="search_input" autocomplete="off">
                    <a href="javascript:;" class="search-button">搜索</a>
                </div>
                <div class="hottel">
                    <div class="hot_pic">
                        <img src="images/hot_tel.jpg" alt="">
                    </div>
                    <div class="hot_tel">
                        <p class="hot_time">客服热线(9:00-6:00)</p>
                        <p class="hot_num">400-618-9090</p>
                    </div>
                </div>
            </div>
        </div>
    </header>
    <!-- 头部 end -->
     <!-- 首页导航 -->
    <div class="navitem">
        <ul class="nav">
            <li class="nav-active"><a href="index.html">首页</a></li>
            <li><a href="route_list.html">门票</a></li>
            <li><a href="route_list.html">酒店</a></li>
            <li><a href="route_list.html">香港车票</a></li>
            <li><a href="route_list.html">出境游</a></li>
            <li><a href="route_list.html">国内游</a></li>
            <li><a href="route_list.html">港澳游</a></li>
            <li><a href="route_list.html">抱团定制</a></li>
            <li><a href="route_list.html">全球自由行</a></li>
            <li><a href="favoriterank.html">收藏排行榜</a></li>
        </ul>
    </div>

serlet实现

package com.bai.web.servlet;

import com.fasterxml.jackson.databind.ObjectMapper;

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 java.io.IOException;

@WebServlet("/findUserServlet")
public class FindUserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //从session中获取登录用户
        Object user = req.getSession().getAttribute("user");
        //将user写回客户端
        ObjectMapper mapper = new ObjectMapper();
        resp.setContentType("application/json;charset=utf-8");
        mapper.writeValue(resp.getOutputStream(),user);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

User findByUsernameAndPassword(String username, String password);

标签：info,登录,resp,User,旅游网,import,servlet,黑马,user
From： https://www.cnblogs.com/aimz01/p/16623584.html

综合案例-黑马旅游网_登录功能

综合案例-黑马旅游网_登录功能

分析

实现_Loginservlet

实现service代码

实现Dao代码

前端代码实现

index页面中用户姓名的提示信息

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