旅游网项目2

7.优化Servlet

7.1目的

减少Servlet的数量，现在是一个功能一个Servlet，将其优化为一个模块一个Servlet，相当于在数据库中一张表对应一个Servlet，在Servlet中提供不同的方法，完成用户的请求。

Idea控制台中文乱码解决：-Dfile.encoding=gb2312

7.2BaseServlet编写

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;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class BaseServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        System.out.println("BaseServle的service方法执行了");
        //完成方法分发
        //1.获取请求路径
        String uri = req.getRequestURI(); ///travel/user/add
//        System.out.println(uri);

        //2.获取方法名称
        String methodName = uri.substring(uri.lastIndexOf('/') + 1);
//        System.out.println(methodName); //add
        //3.获取方法对象
        //this谁调用我，我代表谁
//        System.out.println(this); //UserServlet对象
        try {
            Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
           //忽略访问权限修饰符获取方法
//            Method method = this.getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            //4.执行方法
            //暴力反射
//            method.setAccessible(true);
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

    }
}

7.3UserServlet改写

package cn.itcast.travel.web.servlet;

import cn.itcast.travel.domain.ResultInfo;
import cn.itcast.travel.domain.User;
import cn.itcast.travel.service.UserService;
import cn.itcast.travel.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("/user/*") //user/add  user/find
public class UserServlet extends BaseServlet {
    //声明一个UserService成员变量
    private  UserService service = new UserServiceImpl();

    /*
    注册功能
     */
    public void regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //验证校验
        String check = request.getParameter("check");
        //从sesion中获取验证码
        HttpSession session = request.getSession();
        String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
        session.removeAttribute("CHECKCODE_SERVER");//为了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("验证码错误");
            //将info对象序列化为json
            ObjectMapper mapper = new ObjectMapper();
            String json = mapper.writeValueAsString(info);
            response.setContentType("application/json;charset=utf-8");
            response.getWriter().write(json);
            return;
        }

        //1.获取数据
        Map<String, String[]> map = request.getParameterMap();

        //2.封装对象
        User user = new User();
        try {
            BeanUtils.populate(user, map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        //3.调用service完成注册
//        UserService service = new UserServiceImpl();
        boolean flag = service.regist(user);
        ResultInfo info = new ResultInfo();
        //4.响应结果
        if (flag) {
            //注册成功
            info.setFlag(true);

        } else {
            //注册失败
            info.setFlag(false);
            info.setErrorMsg("注册失败！");
        }
        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(info);
        //将json数据写回客户端
        //设置content-type
        response.setContentType("application/json;charset=utf-8");
        response.getWriter().write(json);
    }
    /*
        登录功能
         */
    public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //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("用户名或密码错误");
        }

        //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())) {
            request.getSession().setAttribute("user", u);//登录成功标记

            //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);
    }
    /*
        查询单个对象
         */
    public void findOne(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);
    }
    /*
        退出功能
         */
    public void exit(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");
    }
    /*
        激活功能
         */
    public void active(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取激活码
        String code = request.getParameter("code");
        if (code != null) {
            //2.调用service完成激活
//            UserService service = new UserServiceImpl();
            boolean flag = service.active(code);

            //3.判断标记
            String msg = null;
            if (flag) {
                //激活成功
                msg = "激活成功，请<a href='login.html'>登录</a>";
            } else {
                //激活失败
                msg = "激活失败，请联系管理员!";
            }
            response.setContentType("text/html;charset=utf-8");
            response.getWriter().write(msg);
        }
    }
}

注：改写完成之后，相应的html文件中的路径也要改一下。

8.分类数据展示

8.1效果

8.2分析

8.3后台代码

CategoryServlet

package cn.itcast.travel.web.servlet;

import cn.itcast.travel.domain.Category;
import cn.itcast.travel.service.CategoryService;
import cn.itcast.travel.service.impl.CategoryServiceImpl;
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;
import java.util.List;

@WebServlet("/category/*")
public class CategoryServlet extends BaseServlet {
    private CategoryService service = new CategoryServiceImpl();
    /*
    查询所有
     */
    public void findAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.调用service查询所有
        List<Category> cs = service.findAll();
        //2.序列化json返回
//        ObjectMapper mapper = new ObjectMapper();
//        response.setContentType("application/json;charset=utf-8");
//        mapper.writeValue(response.getOutputStream(),cs);
        writeValue(cs,response);
        
    }

    public void find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("CategoryServlet的find方法...");
    }
}

CategoryService

package cn.itcast.travel.service;

import cn.itcast.travel.domain.Category;

import java.util.List;

public interface CategoryService {
    List<Category> findAll();
}

package cn.itcast.travel.service.impl;

import cn.itcast.travel.dao.CategoryDao;
import cn.itcast.travel.dao.impl.CategoryDaoImpl;
import cn.itcast.travel.domain.Category;
import cn.itcast.travel.service.CategoryService;

import java.util.List;

public class CategoryServiceImpl implements CategoryService {
    private CategoryDao categoryDao = new CategoryDaoImpl();

    @Override
    public List<Category> findAll() {
        return categoryDao.findAll();
    }
}

CategoryDao

package cn.itcast.travel.dao;

import cn.itcast.travel.domain.Category;

import java.util.List;

public interface CategoryDao {

     List<Category> findAll();
}

package cn.itcast.travel.dao.impl;

import cn.itcast.travel.dao.CategoryDao;
import cn.itcast.travel.domain.Category;
import cn.itcast.travel.util.JDBCUtils;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public class CategoryDaoImpl implements CategoryDao {
    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
    @Override
    public List<Category> findAll() {
        String sql = "select * from tab_category ";
        return template.query(sql,new BeanPropertyRowMapper<Category>(Category.class));
    }
}

在BaseServlet中封装了序列化json的方法

package cn.itcast.travel.web.servlet;

import com.fasterxml.jackson.core.JsonProcessingException;
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;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class BaseServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        System.out.println("BaseServle的service方法执行了");
        //完成方法分发
        //1.获取请求路径
        String uri = req.getRequestURI(); ///travel/user/add
//        System.out.println(uri);

        //2.获取方法名称
        String methodName = uri.substring(uri.lastIndexOf('/') + 1);
//        System.out.println(methodName); //add
        //3.获取方法对象
        //this谁调用我，我代表谁
//        System.out.println(this); //UserServlet对象
        try {
            Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
           //忽略访问权限修饰符获取方法
//            Method method = this.getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            //4.执行方法
            //暴力反射
//            method.setAccessible(true);
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

    }

    /*
    直接将传入的对象序列化为json,并且写回客户端
     */
    public  void writeValue(Object obj,HttpServletResponse response) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        response.setContentType("application/json;charset=utf-8");
        mapper.writeValue(response.getOutputStream(),obj);
    }

    /*
    将传入的对象序列化返回
     */
    public  String writeValueAsString(Object obj) throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        return mapper.writeValueAsString(obj);

    }
}

8.4前台代码

header.html加载后，发送ajax请求，请求category/findAll

<!-- 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);

        });

        //查询分类数据
        $.get("category/findAll",{},function (data) {
            //[{cid:1,cname:国内游},{},{}]
            var lis = '<li class="nav-active"><a href="index.html">首页</a></li>';
            //遍历数组，拼接字符串
            for (var i = 0; i < data.length; i++) {
                var li =' <li><a href="favoriterank.html">'+data[i].cname+'</a></li>'
                lis += li;
            }

            //拼接收藏榜的li
            lis+= ' <li><a href="favoriterank.html">收藏排行榜</a></li>';

            //将lis中的内容设置到ul的html中
            $("#category").html(lis);
        });
    });

</script>
<!-- 头部 start -->
    <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>
    

8.5对分类数据进行缓存优化

分析发现，分类的数据在每一次页面加载后都会重新请求数据库来加载，对数据库的压力比较大，而且分类的数据不会经常产生变化，所有可以使用redis来缓存这个数据。

分析：

8.6优化代码实现

期望数据中存储的顺序就是将来展示的顺序，使用redis的sortedset

package cn.itcast.travel.service.impl;

import cn.itcast.travel.dao.CategoryDao;
import cn.itcast.travel.dao.impl.CategoryDaoImpl;
import cn.itcast.travel.domain.Category;
import cn.itcast.travel.service.CategoryService;
import cn.itcast.travel.util.JedisUtil;
import redis.clients.jedis.Jedis;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

public class CategoryServiceImpl implements CategoryService {
    private CategoryDao categoryDao = new CategoryDaoImpl();

    @Override
    public List<Category> findAll() {
        //1.从redis中查询
        //1.1获取jedis客户端
        Jedis jedis = JedisUtil.getJedis();
        //1.2可以使用sortedset排序查询
        Set<String> categorys = jedis.zrange("category", 0, -1);
        List<Category> cs = null;
        //2.判断查询的集合是否为空
        if(categorys==null || categorys.size() == 0){
            System.out.println("从数据库中查询。。。");
            //3.如果为空，需要从数据库中查询，再将数据存入Redis
            //3.1从数据库中查询
            cs =  categoryDao.findAll();
            //3.2将集合数据存储到redis中的category的key
            for (int i = 0; i < cs.size(); i++) {
                jedis.zadd("category",cs.get(i).getCid(),cs.get(i).getCname());
                
            }
        }else {
            System.out.println("从缓存中查询。。。");
            //4.如果不为空，将set的数据存入list
            cs = new ArrayList<Category>();
            for (String name : categorys) {
                Category category = new Category();
                category.setCname(name);
                cs.add(category);
            }
        }

        return cs;
    }
}

9.旅游线路的分页展示

点击了不同的分类后，将来看到的旅游线路不一样的。通过分析数据库表结构，发现，旅游线路表和分类表时一个多对一的关系

查询不同分类的旅游线路sql

Select * from tab_route where cid = ?;

9.1类别id的传递

Redis中查询score（cid）

package cn.itcast.travel.service.impl;

import cn.itcast.travel.dao.CategoryDao;
import cn.itcast.travel.dao.impl.CategoryDaoImpl;
import cn.itcast.travel.domain.Category;
import cn.itcast.travel.service.CategoryService;
import cn.itcast.travel.util.JedisUtil;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Tuple;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

public class CategoryServiceImpl implements CategoryService {
    private CategoryDao categoryDao = new CategoryDaoImpl();

    @Override
    public List<Category> findAll() {
        //1.从redis中查询
        //1.1获取jedis客户端
        Jedis jedis = JedisUtil.getJedis();
        //1.2可以使用sortedset排序查询
//        Set<String> categorys = jedis.zrange("category", 0, -1);
        //1.3查询sortedset的分数(cid)和值(cname)
        Set<Tuple> categorys = jedis.zrangeWithScores("category", 0, -1);
        List<Category> cs = null;
        //2.判断查询的集合是否为空
        if(categorys==null || categorys.size() == 0){
            System.out.println("从数据库中查询。。。");
            //3.如果为空，需要从数据库中查询，再将数据存入Redis
            //3.1从数据库中查询
            cs =  categoryDao.findAll();
            //3.2将集合数据存储到redis中的category的key
            for (int i = 0; i < cs.size(); i++) {
                jedis.zadd("category",cs.get(i).getCid(),cs.get(i).getCname());
                
            }
        }else {
            System.out.println("从缓存中查询。。。");
            //4.如果不为空，将set的数据存入list
            cs = new ArrayList<Category>();
            for (Tuple tuple : categorys) {
                Category category = new Category();
                category.setCname(tuple.getElement());
                category.setCid((int)tuple.getScore());
                cs.add(category);
            }
        }

        return cs;
    }
}

页面传递cid

header.html传递cid

<!-- 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);

        });

        //查询分类数据
        $.get("category/findAll", {}, function (data) {
            //[{cid:1,cname:国内游},{},{}]
            var lis = '<li class="nav-active"><a href="index.html">首页</a></li>';
            //遍历数组，拼接字符串
            for (var i = 0; i < data.length; i++) {
                var li = ' <li><a href="favoriterank.html?cid=' + data[i].cid + '">' + data[i].cname + '</a></li>'
                lis += li;
            }

            //拼接收藏榜的li
            lis += ' <li><a href="favoriterank.html">收藏排行榜</a></li>';

            //将lis中的内容设置到ul的html中
            $("#category").html(lis);
        });
    });

</script>
<!-- 头部 start -->
<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>
    

获取cid

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>黑马旅游-搜索</title>
    <link rel="stylesheet" type="text/css" href="css/common.css">
    <link rel="stylesheet" href="css/search.css">
    <script src="js/jquery-3.3.1.js"></script>

    <script>
        $(function () {
            var search = location.search;
            //alert(search);//?id=5
            // 切割字符串，拿到第二个值
            var cid = search.split("=")[1];

            //当页码加载完成后，调用load方法，发送ajax请求加载数据
            load(cid);
        });
    </script>
</head>
<body>
<!--引入头部-->
<div id="header"></div>
    <div class="page_one">
        <div class="contant">
            <div class="crumbs">
                <img src="images/search.png" alt="">
                <p>黑马旅行><span>搜索结果</span></p>
            </div>
            <div class="xinxi clearfix">
                <div class="left">
                    <div class="header">
                        <span>商品信息</span>
                        <span class="jg">价格</span>
                    </div>
                    <ul>
                        <li>
                            <div class="img"><img src="images/04-search_03.jpg" alt=""></div>
                            <div class="text1">
                                <p>【减100元 含除夕/春节出发】广州增城三英温泉度假酒店/自由行套票</p>
                                <br/>
                                <p>1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！</p>
                            </div>
                            <div class="price">
                                <p class="price_num">
                                    <span>&yen;</span>
                                    <span>299</span>
                                    <span>起</span>
                                </p>
                                <p><a href="route_detail.html">查看详情</a></p>
                            </div>
                        </li>
                        <li>
                            <div class="img"><img src="images/04-search_03.jpg" alt=""></div>
                            <div class="text1">
                                <p>浪花朵朵旅行普吉岛丛林飞跃空中飞人探险游中文服务泰国旅游</p>
                                <br/>
                                <p>1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！</p>
                            </div>
                            <div class="price">
                                <p class="price_num">
                                    <span>&yen;</span>
                                    <span>899</span>
                                    <span>起</span>
                                </p>
                                <p><a href="route_detail.html">查看详情</a></p>
                            </div>
                        </li>
                        <li>
                            <div class="img"><img src="images/04-search_03.jpg" alt=""></div>
                            <div class="text1">
                                <p>黑妞皇家旅行普吉岛攀牙湾大船星光之旅皮划艇日落休闲特色体验</p>
                                <br/>
                                <p>1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！</p>
                            </div>
                            <div class="price">
                                <p class="price_num">
                                    <span>&yen;</span>
                                    <span>999</span>
                                    <span>起</span>
                                </p>
                                <p><a href="route_detail.html">查看详情</a></p>
                            </div>
                        </li>
                        <li>
                            <div class="img"><img src="images/04-search_03.jpg" alt=""></div>
                            <div class="text1">
                                <p>浪花朵朵旅行普吉岛皇帝岛珊瑚岛香蕉船拖拽伞水上项目</p>
                                <br/>
                                <p>1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！</p>
                            </div>
                            <div class="price">
                                <p class="price_num">
                                    <span>&yen;</span>
                                    <span>99</span>
                                    <span>起</span>
                                </p>
                                <p><a href="route_detail.html">查看详情</a></p>
                            </div>
                        </li>
                        <li>
                            <div class="img"><img src="images/04-search_03.jpg" alt=""></div>
                            <div class="text1">
                                <p>环游记 泰国清迈Lila massage女子监狱spa 丽菈泰式按摩马杀鸡</p>
                                <br/>
                                <p>1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！</p>
                            </div>
                            <div class="price">
                                <p class="price_num">
                                    <span>&yen;</span>
                                    <span>199</span>
                                    <span>起</span>
                                </p>
                                <p><a href="route_detail.html">查看详情</a></p>
                            </div>
                        </li>
                        <li>
                            <div class="img"><img src="images/04-search_03.jpg" alt=""></div>
                            <div class="text1">
                                <p>【减100元 含除夕/春节出发】广州增城三英温泉度假酒店/自由行套票</p>
                                <br/>
                                <p>1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！</p>
                            </div>
                            <div class="price">
                                <p class="price_num">
                                    <span>&yen;</span>
                                    <span>899</span>
                                    <span>起</span>
                                </p>
                                <p><a href="route_detail.html">查看详情</a></p>
                            </div>
                        </li>
                        <li>
                            <div class="img"><img src="images/04-search_03.jpg" alt=""></div>
                            <div class="text1">
                                <p>【减100元 含除夕/春节出发】广州增城三英温泉度假酒店/自由行套票</p>
                                <br/>
                                <p>1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！</p>
                            </div>
                            <div class="price">
                                <p class="price_num">
                                    <span>&yen;</span>
                                    <span>1199</span>
                                    <span>起</span>
                                </p>
                                <p><a href="route_detail.html">查看详情</a></p>
                            </div>
                        </li>
                        <li>
                            <div class="img"><img src="images/04-search_03.jpg" alt=""></div>
                            <div class="text1">
                                <p>泰国芭提雅三合一日游芭提雅蒂芬妮人妖秀成人门票bigeye含接送</p>
                                <br/>
                                <p>1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！</p>
                            </div>
                            <div class="price">
                                <p class="price_num">
                                    <span>&yen;</span>
                                    <span>1589</span>
                                    <span>起</span>
                                </p>
                                <p><a href="route_detail.html">查看详情</a></p>
                            </div>
                        </li>
                    </ul>
                    <div class="page_num_inf">
                        <i></i> 共
                        <span>12</span>页<span>132</span>条
                    </div>
                    <div class="pageNum">
                        <ul>
                            <li><a href="">首页</a></li>
                            <li class="threeword"><a href="#">上一页</a></li>
                            <li><a href="#">1</a></li>
                            <li><a href="#">2</a></li>
                            <li><a href="#">3</a></li>
                            <li><a href="#">4</a></li>
                            <li><a href="#">5</a></li>
                            <li><a href="#">6</a></li>
                            <li><a href="#">7</a></li>
                            <li><a href="#">8</a></li>
                            <li><a href="#">9</a></li>
                            <li><a href="#">10</a></li>
                            <li class="threeword"><a href="javascript:;">下一页</a></li>
                            <li class="threeword"><a href="javascript:;">末页</a></li>
                        </ul>
                    </div>
                </div>
                <div class="right">
                    <div class="top">
                        <div class="hot">HOT</div>
                        <span>热门推荐</span>
                    </div>
                    <ul>
                        <li>
                            <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                            <div class="right">
                                <p>清远新银盏温泉度假村酒店/自由行套...</p>
                                <p>网付价<span>&yen;<span>899</span>起</span>
                                </p>
                            </div>
                        </li>
                        <li>
                            <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                            <div class="right">
                                <p>清远新银盏温泉度假村酒店/自由行套...</p>
                                <p>网付价<span>&yen;<span>899</span>起</span>
                                </p>
                            </div>
                        </li>
                        <li>
                            <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                            <div class="right">
                                <p>清远新银盏温泉度假村酒店/自由行套...</p>
                                <p>网付价<span>&yen;<span>899</span>起</span>
                                </p>
                            </div>
                        </li>
                        <li>
                            <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                            <div class="right">
                                <p>清远新银盏温泉度假村酒店/自由行套...</p>
                                <p>网付价<span>&yen;<span>899</span>起</span>
                                </p>
                            </div>
                        </li>
                        <li>
                            <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                            <div class="right">
                                <p>清远新银盏温泉度假村酒店/自由行套...</p>
                                <p>网付价<span>&yen;<span>899</span>起</span>
                                </p>
                            </div>
                        </li>
                    </ul>
                </div>
            </div>
        </div>
    </div>

    <!--引入头部-->
    <div id="footer"></div>
    <!--导入布局js，共享header和footer-->
    <script type="text/javascript" src="js/include.js"></script>
</body>

</html>

9.2根据id查询不同类别的旅游线路数据

分页展示旅游线路数据

1.分析

2.客户端代码编写

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>黑马旅游-搜索</title>
    <link rel="stylesheet" type="text/css" href="css/common.css">
    <link rel="stylesheet" href="css/search.css">
    <script src="js/jquery-3.3.1.js"></script>

    <script>
        $(function () {
            var search = location.search;
            //alert(search);//?id=5
            // 切割字符串，拿到第二个值
            var cid = search.split("=")[1];

            //当页码加载完成后，调用load方法，发送ajax请求加载数据
            load(cid);
        });

        function load(cid, currentPage) {
            //发送ajax请求，请求route/pageQuery,传递cid
            $.get("route/pageQuery", {cid: cid, currentPage: currentPage}, function (pb) {
                //解析pagebean数据，展示到页面上
                //1.分页工具条数据展示
                //1.1 展示总页码和总记录数
                $("#totalPage").html(pb.totalPage);
                $("#totalCount").html(pb.totalCount);

                var lis = "";
                var firstPage = ' <li onclick="javascript:load(' + cid + ')"><a href="javascript:void(0)">首页</a></li>';
                //计算上一页的页码
                var beforeNum = pb.currentPage - 1;
                if (beforeNum <= 0) {
                    beforeNum = 1;
                }

                var beforePage = '<li  onclick="javascipt:load(' + cid + ',' + beforeNum + ')" class="threeword"><a href="javascript:void(0)">上一页</a></li>';

                lis += firstPage;
                lis += beforePage;

                /*for (var i = 1; i <= pb.totalPage; i++) {
                    //创建页码的li
                    var li;
                    //判断当前页码是否等于i
                    if (pb.currentPage == i) {
                        li = ' <li class="curPage" onclick="javascript:load(' + cid + ',' + i + ')"><a href="javascript:void(0)">' + i + '</a></li>';
                    } else {
                        var li = ' <li onclick="javascript:load(' + cid + ',' + i + ')"><a href="javascript:void(0)">' + i + '</a></li>';
                    }
                    //拼接字符串
                    lis += li;
                }*/

                //1.2 展示分页页码
                /*
                    1.一共展示10个页码，能够达到前5后4的效果
                    2.如果前边不够5个，后边补齐10个
                    3.如果后边不足4个，前边补齐10个
                */
                // 定义开始位置begin,结束位置 end
                var begin; // 开始位置
                var end; //  结束位置

                //1.要显示10个页码
                if (pb.totalPage < 10) {
                    //总页码不够10页

                    begin = 1;
                    end = pb.totalPage;
                } else {
                    //总页码超过10页

                    begin = pb.currentPage - 5;
                    end = pb.currentPage + 4;

                    //2.如果前边不够5个，后边补齐10个
                    if (begin < 1) {
                        begin = 1;
                        end = begin + 9;
                    }

                    //3.如果后边不足4个，前边补齐10个
                    if (end > pb.totalPage) {
                        end = pb.totalPage;
                        begin = end - 9;
                    }
                }

                for (var i = begin; i <= end; i++) {
                    var li;
                    //判断当前页码是否等于i
                    if (pb.currentPage == i) {

                        li = '<li class="curPage" onclick="javascipt:load(' + cid + ',' + i + ')"><a href="javascript:void(0)">' + i + '</a></li>';

                    } else {
                        //创建页码的li
                        li = '<li onclick="javascipt:load(' + cid + ',' + i + ')"><a href="javascript:void(0)">' + i + '</a></li>';
                    }
                    //拼接字符串
                    lis += li;
                }

                var lastNum = pb.totalPage;
                var lastPage = '<li onclick="javascript:load(' + cid + ',' + lastNum + ')"><a href="javascript:void(0)">末页</a></li>';
                var nextNum = pb.currentPage + 1;
                if (nextNum > lastNum) {
                    nextNum = lastNum;
                }
                var nextPage = '<li  onclick="javascipt:load(' + cid + ',' + nextNum + ')" class="threeword"><a href="javascript:void(0)">下一页</a></li>';
                lis += nextPage;
                lis += lastPage;
                //奖lis内容设置到ul中
                $("#pageNum").html(lis);

                //2.列表数据展示
                //2.列表数据展示
                var route_lis = "";

                for (var i = 0; i < pb.list.length; i++) {
                    //获取{rid:1,rname:"xxx"}
                    var route = pb.list[i];

                    var li = '<li>
' +
                        '                        <div class="img"><img src="' + route.rimage + '" style=" 299px;"></div>
' +
                        '                        <div class="text1">
' +
                        '                            <p>' + route.rname + '</p>
' +
                        '                            <br/>
' +
                        '                            <p>' + route.routeIntroduce + '</p>
' +
                        '                        </div>
' +
                        '                        <div class="price">
' +
                        '                            <p class="price_num">
' +
                        '                                <span>&yen;</span>
' +
                        '                                <span>' + route.price + '</span>
' +
                        '                                <span>起</span>
' +
                        '                            </p>
' +
                        '                            <p><a href="route_detail.html">查看详情</a></p>
' +
                        '                        </div>
' +
                        '                    </li>';
                    route_lis += li;
                }
                $("#route").html(route_lis);

                //定位到页面顶部
                window.scrollTo(0,0);

            });
        }
    </script>
</head>
<body>
<!--引入头部-->
<div id="header"></div>
<div class="page_one">
    <div class="contant">
        <div class="crumbs">
            <img src="images/search.png" alt="">
            <p>黑马旅行><span>搜索结果</span></p>
        </div>
        <div class="xinxi clearfix">
            <div class="left">
                <div class="header">
                    <span>商品信息</span>
                    <span class="jg">价格</span>
                </div>
                <ul id="route">
                    <!-- <li >
                         <div class="img"><img src="images/04-search_03.jpg" alt=""></div>
                         <div class="text1">
                             <p>【减100元 含除夕/春节出发】广州增城三英温泉度假酒店/自由行套票</p>
                             <br/>
                             <p>1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！</p>
                         </div>
                         <div class="price">
                             <p class="price_num">
                                 <span>&yen;</span>
                                 <span>299</span>
                                 <span>起</span>
                             </p>
                             <p><a href="route_detail.html">查看详情</a></p>
                         </div>
                     </li>-->
                </ul>
                <div class="page_num_inf">
                    <i></i> 共
                    <span id="totalPage"> </span>页<span id="totalCount"> </span>条
                </div>
                <div class="pageNum">
                    <ul id="pageNum">
                        <!-- <li><a href="">首页</a></li>
                         <li class="threeword"><a href="#">上一页</a></li>
                         <li><a href="#">1</a></li>
                         <li><a href="#">2</a></li>
                         <li class="threeword"><a href="javascript:;">下一页</a></li>
                         <li class="threeword"><a href="javascript:;">末页</a></li>-->
                    </ul>
                </div>
            </div>
            <div class="right">
                <div class="top">
                    <div class="hot">HOT</div>
                    <span>热门推荐</span>
                </div>
                <ul>
                    <li>
                        <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                        <div class="right">
                            <p>清远新银盏温泉度假村酒店/自由行套...</p>
                            <p>网付价<span>&yen;<span>899</span>起</span>
                            </p>
                        </div>
                    </li>
                    <li>
                        <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                        <div class="right">
                            <p>清远新银盏温泉度假村酒店/自由行套...</p>
                            <p>网付价<span>&yen;<span>899</span>起</span>
                            </p>
                        </div>
                    </li>
                    <li>
                        <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                        <div class="right">
                            <p>清远新银盏温泉度假村酒店/自由行套...</p>
                            <p>网付价<span>&yen;<span>899</span>起</span>
                            </p>
                        </div>
                    </li>
                    <li>
                        <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                        <div class="right">
                            <p>清远新银盏温泉度假村酒店/自由行套...</p>
                            <p>网付价<span>&yen;<span>899</span>起</span>
                            </p>
                        </div>
                    </li>
                    <li>
                        <div class="left"><img src="images/04-search_09.jpg" alt=""></div>
                        <div class="right">
                            <p>清远新银盏温泉度假村酒店/自由行套...</p>
                            <p>网付价<span>&yen;<span>899</span>起</span>
                            </p>
                        </div>
                    </li>
                </ul>
            </div>
        </div>
    </div>
</div>

<!--引入头部-->
<div id="footer"></div>
<!--导入布局js，共享header和footer-->
<script type="text/javascript" src="js/include.js"></script>
</body>

</html>

3.服务器端代码编写

a) 创建PageBean对象

package cn.itcast.travel.domain;

import java.util.List;

public class PageBean<T> {
    private int totalCount;//总记录数
    private int totalPage;//总页数
    private int currentPage;//当前页码
    private int pageSize;//每页显示的条数

    private List<T> list;//每页显示的数据集合

    public int getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }

    public int getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public int getCurrentPage() {
        return currentPage;
    }

    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }
}

b) RouteServlet

package cn.itcast.travel.web.servlet;

import cn.itcast.travel.domain.PageBean;
import cn.itcast.travel.domain.Route;
import cn.itcast.travel.service.RouteService;
import cn.itcast.travel.service.impl.RouteServiceImpl;

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("/route/*")
public class RouteServlet extends BaseServlet {
    private RouteService routeService = new RouteServiceImpl();

    /*
    分页查询
     */
    public void pageQuery(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.接受参数
        String currentPageStr = request.getParameter("currentPage");
        String pageSizeStr = request.getParameter("pageSize");
        String cidStr = request.getParameter("cid");

        //2.处理参数
        int cid = 0;//类别id
        if (cidStr != null && cidStr.length() > 0) {
            cid = Integer.parseInt(cidStr);
        }

        int currentPage = 0;//当前页码，默认为第一页
        if (currentPageStr != null && currentPageStr.length() > 0) {
            currentPage = Integer.parseInt(currentPageStr);
        } else {
            currentPage = 1;
        }

        int pageSize = 0;//每页显示条数，默认显示5条
        if (pageSizeStr != null && pageSizeStr.length() > 0) {
            pageSize = Integer.parseInt(pageSizeStr);
        } else {
            pageSize = 5;
        }
        //3. 调用service查询PageBean对象
        PageBean<Route> pb = routeService.pageQuery(cid, currentPage, pageSize);

        //4. 将pageBean对象序列化为json，返回
        writeValue(pb, response);
    }


}

c) RouteService

package cn.itcast.travel.service;

import cn.itcast.travel.domain.PageBean;
import cn.itcast.travel.domain.Route;

public interface RouteService {
    /*
      根据类别进行分页查询
     */
     PageBean<Route> pageQuery(int cid, int currentPage, int pageSize);
}

package cn.itcast.travel.service.impl;

import cn.itcast.travel.dao.RouteDao;
import cn.itcast.travel.dao.impl.RouteDaoImpl;
import cn.itcast.travel.domain.PageBean;
import cn.itcast.travel.domain.Route;
import cn.itcast.travel.service.RouteService;

import java.util.List;

public class RouteServiceImpl implements RouteService {
    private RouteDao routeDao = new RouteDaoImpl();

    @Override
    public PageBean<Route> pageQuery(int cid, int currentPage, int pageSize) {
        //封装pageBean
        PageBean<Route> pb = new PageBean<>();
        //设置当前页码
        pb.setCurrentPage(currentPage);
        //设置每页显示条数
        pb.setPageSize(pageSize);

        //设置总记录数
        int totalCount = routeDao.findTotalCount(cid);
        pb.setTotalCount(totalCount);

        //设置当前页显示的数据集合
        int start = (currentPage - 1) * pageSize;//开始的记录数
        List<Route> list = routeDao.findByPage(cid,start,pageSize);
        pb.setList(list);

        //设置总页数 = 总记录数/每页显示条数
        int totalPage = totalCount % pageSize == 0 ? totalCount / pageSize :(totalCount / pageSize) + 1 ;
        pb.setTotalPage(totalPage);

        return pb;
    }
}

d) RouteDao

package cn.itcast.travel.dao;

import cn.itcast.travel.domain.Route;

import java.util.List;

public interface RouteDao {
    /*
    根据cid查询总记录数
     */
    int findTotalCount(int cid);

    /*
    根据cid，start，pageSize查询当前页的数据集合
     */
    List<Route> findByPage(int cid,int start,int pageSize);


}

package cn.itcast.travel.dao.impl;

import cn.itcast.travel.dao.RouteDao;
import cn.itcast.travel.domain.Route;
import cn.itcast.travel.util.JDBCUtils;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public class RouteDaoImpl implements RouteDao {
    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());

    @Override
    public int findTotalCount(int cid) {
        String sql = "select count(*) from tab_route where cid = ?";
        return template.queryForObject(sql,Integer.class,cid);
    }

    @Override
    public List<Route> findByPage(int cid, int start, int pageSize) {
        String sql = "select * from tab_route where cid = ? limit ? , ?";

        return template.query(sql,new BeanPropertyRowMapper<Route>(Route.class),cid,start,pageSize);
    }
}