2-黑马旅游网登陆-退出

代码实现

前台代码

<!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 () {
            //1.给登录按钮绑定单击事件
			$("#btn_sub").click(function () {
                //2.发送ajax请求，提交表单数据
				$.post("user/login",$("#loginForm").serialize(),function (data) {
					//data : {flag:false,errorMsg:''}
					if(data.flag){
					    //登录成功
						location.href="index.html";
					}else{
					    //登录失败
						$("#errorMsg").html(data.errorMsg);
					}
                });
            });
        });


		//3.处理响应结果



	</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>

在这里插入图片描述

后台代码

LoginServlet

//1.获取用户名和密码数据
Map<String, String[]> map = request.getParameterMap();
//2.封装User对象
User user = new User();
try {
    BeanUtils.populate(user,map);
} catch (IllegalAccessException e) {
    e.printStackTrace();
} catch (InvocationTargetException e) {
    e.printStackTrace();
}

//3.调用Service查询
UserService service = new UserServiceImpl();
User u  = service.login(user);

ResultInfo info = new ResultInfo();

//4.判断用户对象是否为null
if(u == null){
    //用户名密码或错误
    info.setFlag(false);
    info.setErrorMsg("用户名密码或错误");
}
//5.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");
}
//6.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();

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

UserService

public User login(User user) {
    return userDao.findByUsernameAndPassword(user.getUsername(),user.getPassword());
}

UserDao

public User findByUsernameAndPassword(String username, String password) {
    User user = null;
    try {
        //1.定义sql
        String sql = "select * from tab_user where username = ? and password = ?";
        //2.执行sql
        user = template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), username,password);
    } catch (Exception e) {

    }

    return user;
}

index页面中用户姓名的提示信息功能

前端代码

<!-- 头部 start -->
<script>
    $(function () {
        //查询用户信息
        $.get("user/findOne",{},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 id="category" 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>

header.html

在这里插入图片描述

Servlet代码

FindUserServlet

package cn.itcast.travel.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 {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //从session中获取登录用户
        Object user = request.getSession().getAttribute("user");
        //将user写回客户端

        ObjectMapper mapper = new ObjectMapper();
        response.setContentType("application/json;charset=utf-8");
        mapper.writeValue(response.getOutputStream(),user);


    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

退出

什么叫做登录了？session中有user对象。

实现步骤：
1.访问servlet，将session销毁
2.跳转到登录页面

Header.html

在这里插入图片描述

Servlet:

package cn.itcast.travel.web.servlet;

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("/exitServlet")
public class ExitServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.销毁session
        request.getSession().invalidate();

        //2.跳转登录页面
        response.sendRedirect(request.getContextPath()+"/login.html");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

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2-黑马旅游网登陆-退出

登录

代码实现

前台代码

后台代码

LoginServlet

UserService

UserDao

index页面中用户姓名的提示信息功能

前端代码

header.html

Servlet代码

FindUserServlet

退出

什么叫做登录了？session中有user对象。

Header.html

Servlet:

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