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

25.2 条件过滤

25.2.1 直接开干

**案例2：**添加品牌、城市、星级、价格等过滤功能

需求效果如图：

步骤：

1. 修改RequestParams类，添加brand、city、starName、minPrice、maxPrice等参数

2. 修改search方法的实现，在关键字搜索时，如果brand等参数存在，对其做过滤

看看请求

• city：筛选城市

因为笔者数据库里面压根儿就没有杭州，我就把这个数据改掉了

OK

把条件都选上

这就是一会儿要接收的请求参数 作为过滤条件

步骤一：拓展IUserService的search方法的参数列表

【修改请求参数实体类】

修改RequestParams类，接收所有参数：

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;

}

OK

步骤二：修改search方法，在match查询基础上添加过滤条件

过滤条件包括：

• city精确匹配
• brand精确匹配
• starName精确匹配
• price范围过滤

注意事项：

• 多个条件之间是AND关系，组合多条件用BooleanQuery
• 参数存在才需要过滤，做好非空判断

直接做

现在的业务层代码【实现类】

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.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.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);

            //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);
    }
}

OK，没啥问题

看看请求

响应结果

没问题

【这样就实现了条件过滤查询】