分页数据展示前后台代码

标签：itcast 分页 cid int 代码 展示 import travel cn

------------恢复内容开始------------

旅游线路-类别id传递

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是一个多对一的关系

 

 

CategoryServiceImpl实现类

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.JDBCUtils;
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();//工具类
        //1.2可使用sortedset排序查询
        //Set<String> categorys = jedis.zrange("category", 0, -1);//范围查询
        //1.3查询sortedset中的分数(cid)和值(cname)
        Set<Tuple> categorys = jedis.zrangeWithScores("category", 0, -1);

        //2.判断查询的集合是否为空
        List<Category> cs = null;
        if (categorys == null || categorys.size() ==0){

            System.out.println("从数据库查询...");
            //3. 如果为空，需要从数据库查询，在将数据存入redis
            //3.1 从数据库查询
             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 {// 进行数据结构的统一 set集合中的缓存数据存储到list集合当中 (转换代码)
            System.out.println("从redis中查询...");
            //4.如果不为空，将set数据存入list
            cs = new ArrayList<Category>();

            for (Tuple tuple : categorys) {
                Category category = new Category();
                category.setCname(tuple.getElement());// 设置名字
                category.setCid((int) tuple.getScore());// 设置id
                cs.add(category);
            }

        }

        return cs;
    }
}

header.html页面

<script>
    $(function () {
        //查询用户登录名字信息
       $.get("user/findOne",{},function (data) {
           //{uid:1,name:'李四'}
           var msg = "欢迎回来，"+data.name;
           $("#span_username").html(msg);
       });

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

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

            //将list字符串，设置到ul的html内容中
            $("#category").html(lis);
        });
    });

</script>

route_list.html页面

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


        })
    </script>

 

 

旅游线路-分页数据展示分析

 

 

创建PageBean对象：

package cn.itcast.travel.domain;

import java.util.List;

/**
 * 分页对象
 */
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



    @Override
    public String toString() {
        return "PageBean{" +
                "totalCount=" + totalCount +
                ", totalPage=" + totalPage +
                ", currentPage=" + currentPage +
                ", pageSize=" + pageSize +
                ", list=" + list +
                '}';
    }

    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;
    }
}

RouteServlet类

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.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
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    public void pageQuery(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.接收参数
        String currentPageStr  = req.getParameter("currentPage");// 当前页码
        String pageSizeStr  = req.getParameter("pageSize");// 每页显示的条数
        String cidStr  = req.getParameter("cid");// 分页id

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

        int currentPage = 0;//当前页码 如果不传递，则默认为第一页
        if (currentPageStr != null &&  currentPageStr.length() > 0){ // 等于null 或者长度小于0 else 让他为1
            currentPage = Integer.parseInt(currentPageStr);
        }else {
            currentPage = 1;
        }

        int pageSize = 0;// 每页显示条数,如果不传递，默认每页显示五条记录
        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, resp);



    }
}

RouteService接口

package cn.itcast.travel.service;

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

/**
 * 线路Service
 */
public interface RouteService {

    /**
     * 分页查询 根据类别进行分页查询
     * @param cid
     * @param currentPage
     * @param pageSize
     * @return
     */
    public PageBean<Route> pageQuery(int cid,int currentPage,int pageSize);

}

 RouteServiceImpl实现类

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 totalCont = routeDao.findTotalCont(cid);
        pb.setTotalCount(totalCont);
        //设置当前页显示的数据集合
        int start = (currentPage - 1) * pageSize;//开始记录数
        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 = totalCont % pageSize == 0 ? totalCont / pageSize : (totalCont / pageSize) +1;
        pb.setTotalPage(totalPage);

        return pb;
    }
}

 RouteDao接口

package cn.itcast.travel.dao;

import cn.itcast.travel.domain.Route;

import java.util.List;

/**
 * 分页查询
 */
public interface RouteDao {

    /**
     * 根据cid查询总记录数
     */
    public int findTotalCont(int cid);



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


}

RouteDaoImpl实现类

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());

    /**
     * 查询总记录数
     * @param cid
     * @return
     */
    @Override
    public int findTotalCont(int cid) {
        String sql = "select count(*) from tab_route where cid = ?";
        return template.queryForObject(sql, Integer.class,cid);
    }

    /**
     * 分页查询
     * @param cid
     * @param start
     * @param pageSize
     * @return
     */
    @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.class),cid,start,pageSize);
    }
}

 

 

 

旅游线路-分页展示前台代码

route_list.html页面

<!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 () {
            let search = location.search;// 查询参数
            //alert(search);// ?cid=5
            // 切割字符串，拿到第二个值
            let cid = search.split("=")[1];//截取
            //alert(cid);

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

        function laod(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);

                /*
                            <li><a href="">首页</a></li>
                            <li class="threeword"><a href="#">上一页</a></li>
                            <li class="curPage"><a href="#">1</a></li><!-- curPage：当前页码 -->
                            <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>
                 */
                var lis = "";

                var frisPage = '<li onclick="laod('+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="laod('+cid+','+beforeNum+')" class="threeword"><a>上一页</a></li>';

                lis += frisPage;
                lis += beforePage;
                //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;
                var end;

                //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 (let 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="javascript:laod('+cid+','+i+')"><a href="javascript:vo(0)">'+i+'</a></li>';
                        }else {
                            //创建一个页面li
                            li = '<li onclick="javascript:laod('+cid+','+i+')"><a href="javascript:vo(0)">'+i+'</a></li>';
                        }

                        //拼接字符串
                        lis += li;
                }


                // //1.2展示分页页码
                // for (let i = 1; i <= pb.totalPage; i++) {
                //     var li;
                //     //判断当前页码是否等于i
                //     if (pb.currentPage == i){
                //         li = '<li class="curPage" onclick="javascript:laod('+cid+','+i+')"><a href="javascript:vo(0)">'+i+'</a></li>';
                //     }else {
                //         //创建一个页面li
                //         li = '<li onclick="javascript:laod('+cid+','+i+')"><a href="javascript:vo(0)">'+i+'</a></li>';
                //     }
                //
                //     //拼接字符串
                //     lis += li;
                // }

                //计算下一页的页码
                var afterNum = pb.currentPage + 1;
                if (afterNum > pb.totalPage){
                    afterNum = pb.totalPage;
                }

                var nextPage = '<li onclick="laod('+cid+','+afterNum+')"><a href="javascript:void(0)">下一页</a></li>';

                var lastPage = '<li onclick="laod('+cid+','+pb.totalPage+')" ><a href="javascript:void(0);">末页</a></li>';

                lis += nextPage;
                lis += lastPage;

                //将lis内容设置到ul页面中
                $("#pageNum").html(lis);

                /*
                        <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>
                 */
                //2.列表数据展示 遍历输出
                var route_lis = "";

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

                    var li = '<li>\n' +
                        '    <div class="img"><img src="'+route.rimage+'" style="width: 299px;height: 169px"></div>\n' +
                        '    <div class="text1">\n' +
                        '        <p>'+route.rname+'</p>\n' +
                        '        <br/>\n' +
                        '        <p>'+route.routeIntroduce+'</p>\n' +
                        '    </div>\n' +
                        '    <div class="price">\n' +
                        '        <p class="price_num">\n' +
                        '            <span>&yen;</span>\n' +
                        '            <span>'+route.price+'</span>\n' +
                        '            <span>起</span>\n' +
                        '        </p>\n' +
                        '        <p>< a href="route_detail.html">查看详情</ a></p>\n' +
                        '    </div>\n' +
                        '</li>';
                    //拼接
                    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>
                        <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">
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