《黑马旅游网》综合案例八 分页数据展示-前台代码

标签：pageSize cid int 黑马 前台 旅游网 var currentPage public

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：

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

    @Override
    public List<Category> findAll() {
        //1、从redis中查询
        //获取jedis客户端
        Jedis jedis = JedisUtil.getJedis();
        //可以使用sortedset排序查询
//        Set<String> categorys = jedis.zrange("category", 0, -1);
        //1.3查询sortedset中的分数（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("从数据库查询.....");
            //3、如果为空，需要从数据库查询，再将数据存入redis
            //从数据库查询
            cs = categoryDao.findAll();
            //将数据集合存储到redis中，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redis查询.....");
            //4、如果不为空，直接返回
            cs = new ArrayList<>();
            for (Tuple tuple : categorys) {
                Category category = new Category();
                category.setCname(tuple.getElement());
                category.setCid((int) tuple.getScore());
                cs.add(category);
            }
        }
        return cs;
    }
}

 header.html类：

<script>
    $(function () {
        $.get("user/findOne",{},function (data) {
            var msg = "欢迎回来,"+data.name;
            $("#span_username").html(msg);
        });

        $.get("category/findAll",{},function (data) {
            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="route_list.html?cid='+data[i].cid+'">'+data[i].cname+'</a></li>';
                lis+=li;
            }
            lis+='<li><a href="favoriterank.html">收藏排行榜</a></li>';
            //将lis字符串，设置到ul的html内容中
            $("#category").html(lis);
        });
    });
</script>

 

route_list.html页面：

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

 

 

 

 

分页数据展示分析

 

 

 

 

创建PageBean对象：

/**
 * 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：

@WebServlet("/route/*")
public class RouteServlet extends BaseServlet {
    private RouteService routeService = new RouteServiceImpl();
    /**
     * 分页查找
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void pageQuery(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //接收参数
        String currentPageStr = request.getParameter("currentPage");
        String pageSizeStr = request.getParameter("pageSize");
        String cidstr = request.getParameter("cid");
        int cid = 0;
        //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){
            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5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,response);
    }
}

RouteService接口：

/**
 * 线路service
 */
public interface RouteService {
    /**
     * 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);
}

RouteServiceIpl实现类：

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;
        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;
    }
}

RouteDao接口：

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

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.class), cid, start, pageSize);
    }
}

 

 

 

 

 

 

分页数据展示前台代码

<!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;
            //切割字符串，拿到第二个值
            var cid = search.split("=")[1];

            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的数据，展示到页面上

                //1、分页工具条数据展示
                //展示总页码和总记录数
                $("#totalPage").html(pb.totalPage);
                $("#totalCount").html(pb.totalCount);

                //展示分页页码
                var lis = "";

                var firstPage = '<li onclick="javascript:laod('+cid+')"><a href="javascript:void(0)">首页</a></li>';

                //计算上一页的页码
                var beforNum = pb.currentPage-1;
                if (beforNum<=0){
                    beforNum=1;
                }
                var beforePage = '<li onclick="javascript:laod('+cid+','+beforNum+')" class="threeword"><a href="javascript:void(0)">上一页</a></li>';

                lis+=firstPage;
                lis+=beforePage;


                /*
                    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="javascript:laod('+cid+','+i+')"><a href="javascript:void(0)">'+i+'</a></li>';
                    }else{
                        //创建页码的li
                        li = '<li onclick="javascript:laod('+cid+','+i+')"><a href="javascript:void(0)">'+i+'</a></li>';
                    }

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


                /*for (var 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:void(0)">'+i+'</a></li>';
                    }else{
                        //创建页码的li
                        li = '<li onclick="javascript:laod('+cid+','+i+')"><a href="javascript:void(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="javascript:laod('+cid+','+afterNum+')" class="threeword"><a href="javascript:void(0)">下一页</a></li>';
                var lastPage = '<li onclick="javascript:laod('+cid+','+pb.totalPage+')" class="threeword"><a href="javascript:void(0)">末页</a></li>';

                lis+=nextPage;
                lis+=lastPage;

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


                //2、列表数据展示
                var route_lis = "";
                for (var i = 0; i < pb.list.length; i++) {
                    var route = pb.list[i];
                    var li = '<li>\n' +
                        '                            <div class="img"><img src="'+route.rimage+'" style="width: 299px;"></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>';
                    route_lis+=li;
                }

                $("#route").html(route_lis);

                //定位到页面的顶部
                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">12</span>页<span id="totalCount">132</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><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>

标签：pageSize,cid,int,黑马,前台,旅游网,var,currentPage,public
From： https://www.cnblogs.com/yuzong/p/17137688.html