微服务框架

【SpringCloud+RabbitMQ+Docker+Redis+搜索+分布式，系统详解springcloud微服务技术栈课程|黑马程序员Java微服务】

SpringCloud微服务架构

25 黑马旅游案例

25.3 我附近的酒店

25.3.1 直接开干

案例：案例3：我附近的酒店

前端页面点击定位后，会将你所在的位置发送到后台：

像下面这样

这里要浏览器获取定位权限，谷歌和Edge 的定位引擎可能会导致无法定位，比如谷歌用的谷歌地图，咱们国内想“直接”使用谷歌地图…还是算了，建议直接开火狐

我们要根据这个坐标，将酒店结果按照到这个点的距离升序排序。

实现思路如下：

• 修改RequestParams参数，接收location字段
• 修改search方法业务逻辑，如果location有值，添加根据geo_distance排序的功能

【距离排序】

距离排序与普通字段排序有所差异，API如下：

OK，

先改下请求参数实体类

package cn.itcast.hotel.pojo;

import lombok.Data;

/**
 * ClassName: RequestParams
 * date: 2022/11/2 11:03
 *
 * @author DingJiaxiong
 */

@Data
public class RequestParams {

    private String key;
    private Integer page;
    private Integer size;
    private String sortBy;

    private String city;
    private String brand;
    private String starName;
    private Integer minPrice;
    private Integer maxPrice;
    
    private String location;

}

直接修改业务代码

package cn.itcast.hotel.service.impl;

import cn.itcast.hotel.mapper.HotelMapper;
import cn.itcast.hotel.pojo.Hotel;
import cn.itcast.hotel.pojo.HotelDoc;
import cn.itcast.hotel.pojo.PageResult;
import cn.itcast.hotel.pojo.RequestParams;
import cn.itcast.hotel.service.IHotelService;
import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.geo.GeoPoint;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilder;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import javax.crypto.spec.OAEPParameterSpec;
import javax.crypto.spec.PBEParameterSpec;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Service
public class HotelService extends ServiceImpl<HotelMapper, Hotel> implements IHotelService {

    @Autowired
    private RestHighLevelClient client;

    @Override
    public PageResult search(RequestParams params) {

        try {
            //1. 准备Request
            SearchRequest request = new SearchRequest("hotel");
            //2. 准备DSL
            //2.1 关键字搜索query

            buildBasicQuery(params, request);

            //2.2 分页
            Integer page = params.getPage();
            Integer size = params.getSize();
            request.source().from((page - 1) * size).size(size);

            //2.3 排序
            String location = params.getLocation();
            if (location != null && !location.equals("")) {
                request.source().sort(SortBuilders
                        .geoDistanceSort("location", new GeoPoint(location))
                        .order(SortOrder.ASC)
                        .unit(DistanceUnit.KILOMETERS)
                );
            }

            //3. 发送请求
            SearchResponse response = client.search(request, RequestOptions.DEFAULT);

            //4. 解析响应
            return handleResponse(response);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private static void buildBasicQuery(RequestParams params, SearchRequest request) {
        //构建BooleanQuery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

        //关键字搜索
        String key = params.getKey();
        //健壮判断
        if (key == null || "".equals(key)) {
            boolQuery.must(QueryBuilders.matchAllQuery());
        } else {
            boolQuery.must(QueryBuilders.matchQuery("all", key));
        }
        //条件过滤
        //【城市】
        if (params.getCity() != null && !params.getCity().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("city", params.getCity()));
        }

        //【品牌】
        if (params.getBrand() != null && !params.getBrand().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("brand", params.getBrand()));
        }

        //【星级】
        if (params.getStarName() != null && !params.getStarName().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("starName", params.getStarName()));
        }

        //【价格】
        if (params.getMinPrice() != null && params.getMaxPrice() != null) {
            boolQuery.filter(QueryBuilders
                    .rangeQuery("price")
                    .gte(params.getMinPrice())
                    .lte(params.getMaxPrice()));
        }

        request.source().query(boolQuery);
    }

    private PageResult handleResponse(SearchResponse response) {
        //4. 解析响应
        SearchHits searchHits = response.getHits();
        //4.1 获取总条数
        long total = searchHits.getTotalHits().value;
        System.out.println("共搜索到" + total + "条数据");

        //4.2 文档数组
        SearchHit[] hits = searchHits.getHits();

        //4.3 遍历
        List<HotelDoc> hotels = new ArrayList<>();

        for (SearchHit hit : hits) {
            //获取文档source
            String json = hit.getSourceAsString();
            //反序列化
            HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);
            hotels.add(hotelDoc);
        }

        //4.4 封装返回
        return new PageResult(total, hotels);
    }
}

先直接重启试试

啊这，我在兰州、为什么要找深圳的酒店…【继续往下做了】

记下我当前位置的经纬度，35.940046, 104.157428

在kibana 测试一下

# 找到35.940046, 104.157428 周围的酒店，距离升序排序
GET /hotel/_search
{
  "query": {
    "match_all": {}
  },
  "sort": [
    {
      "_geo_distance": {
        "location": {
          "lat": 35.940046,
          "lon": 104.157428
        },
        "order": "asc",
        "unit": "km"
      }
    }
  ]
}

直接运行

行的，最近的距离我1118km，【应该是直线距离】

按照距离排序后，还需要显示具体的距离值：

先给实体类来个新的属性【距离】

package cn.itcast.hotel.service.impl;

import cn.itcast.hotel.mapper.HotelMapper;
import cn.itcast.hotel.pojo.Hotel;
import cn.itcast.hotel.pojo.HotelDoc;
import cn.itcast.hotel.pojo.PageResult;
import cn.itcast.hotel.pojo.RequestParams;
import cn.itcast.hotel.service.IHotelService;
import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.geo.GeoPoint;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilder;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import javax.crypto.spec.OAEPParameterSpec;
import javax.crypto.spec.PBEParameterSpec;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Service
public class HotelService extends ServiceImpl<HotelMapper, Hotel> implements IHotelService {

    @Autowired
    private RestHighLevelClient client;

    @Override
    public PageResult search(RequestParams params) {

        try {
            //1. 准备Request
            SearchRequest request = new SearchRequest("hotel");
            //2. 准备DSL
            //2.1 关键字搜索query

            buildBasicQuery(params, request);

            //2.2 分页
            Integer page = params.getPage();
            Integer size = params.getSize();
            request.source().from((page - 1) * size).size(size);

            //2.3 排序
            String location = params.getLocation();
            if (location != null && location.equals("")) {
                request.source().sort(SortBuilders
                        .geoDistanceSort("location", new GeoPoint(location))
                        .order(SortOrder.ASC)
                        .unit(DistanceUnit.KILOMETERS)
                );
            }

            //3. 发送请求
            SearchResponse response = client.search(request, RequestOptions.DEFAULT);

            //4. 解析响应
            return handleResponse(response);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private static void buildBasicQuery(RequestParams params, SearchRequest request) {
        //构建BooleanQuery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

        //关键字搜索
        String key = params.getKey();
        //健壮判断
        if (key == null || "".equals(key)) {
            boolQuery.must(QueryBuilders.matchAllQuery());
        } else {
            boolQuery.must(QueryBuilders.matchQuery("all", key));
        }
        //条件过滤
        //【城市】
        if (params.getCity() != null && !params.getCity().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("city", params.getCity()));
        }

        //【品牌】
        if (params.getBrand() != null && !params.getBrand().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("brand", params.getBrand()));
        }

        //【星级】
        if (params.getStarName() != null && !params.getStarName().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("starName", params.getStarName()));
        }

        //【价格】
        if (params.getMinPrice() != null && params.getMaxPrice() != null) {
            boolQuery.filter(QueryBuilders
                    .rangeQuery("price")
                    .gte(params.getMinPrice())
                    .lte(params.getMaxPrice()));
        }

        request.source().query(boolQuery);
    }

    private PageResult handleResponse(SearchResponse response) {
        //4. 解析响应
        SearchHits searchHits = response.getHits();
        //4.1 获取总条数
        long total = searchHits.getTotalHits().value;
        System.out.println("共搜索到" + total + "条数据");

        //4.2 文档数组
        SearchHit[] hits = searchHits.getHits();

        //4.3 遍历
        List<HotelDoc> hotels = new ArrayList<>();

        for (SearchHit hit : hits) {
            //获取文档source
            String json = hit.getSourceAsString();
            //反序列化
            HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);

            //获取排序值
            Object[] sortValues = hit.getSortValues();
            if (sortValues.length > 0){
                Object sortValue = sortValues[0];
                hotelDoc.setDistance(sortValue);
            }

            hotels.add(hotelDoc);
        }

        //4.4 封装返回
        return new PageResult(total, hotels);
    }
}

直接重启服务

厉害厉害