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

文章目录

• • • 微服务框架
    • 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

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 implements IHotelService {@Autowiredprivate RestHighLevelClient client;@Overridepublic PageResult search(RequestParams params) {try {//1. 准备RequestSearchRequest request = new SearchRequest("hotel");//2. 准备DSL//2.1 关键字搜索querybuildBasicQuery(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BooleanQueryBoolQueryBuilder 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 hotels = new ArrayList<>();for (SearchHit hit : hits) {//获取文档sourceString 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 implements IHotelService {@Autowiredprivate RestHighLevelClient client;@Overridepublic PageResult search(RequestParams params) {try {//1. 准备RequestSearchRequest request = new SearchRequest("hotel");//2. 准备DSL//2.1 关键字搜索querybuildBasicQuery(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BooleanQueryBoolQueryBuilder 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 hotels = new ArrayList<>();for (SearchHit hit : hits) {//获取文档sourceString 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