RestClient查询ElasticSearch

Posted 2023-06-23 Rover20230226

package cn.itcast.hotel;

import cn.itcast.hotel.pojo.HotelDoc;
import com.alibaba.fastjson.JSON;
import org.apache.http.HttpHost;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import java.io.IOException;

@SpringBootTest
public class HotelSearchApplicationTests 

    private RestHighLevelClient client;

    @BeforeEach
    public void before() 
        //client对象就是操作ES的对象
        client =
                new RestHighLevelClient(RestClient.builder
                        (HttpHost.create("http://192.168.221.135:9200")));
    

    @AfterEach
    public void after() throws IOException 
        client.close();
    

    /**
     * match 分词再查询
     */
    @Test
    public void test01() throws IOException 
        //todo 2.搜索条件封装
        SearchRequest searchRequest = new SearchRequest("hotel");

        //todo 4.所有搜索条件封装到 searchSourceBuilder对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //todo 5.添加对象
        searchSourceBuilder.query(QueryBuilders.matchQuery("name","如家全季"));

        //todo 3.添加搜索条件对象
        searchRequest.source(searchSourceBuilder);

        //todo 1.找到搜索的API
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

        //todo 6.解析 searchResponse 返回结果
        SearchHits hits = searchResponse.getHits();

        System.out.println("查询到的总条数为:" + hits.getTotalHits().value);

        SearchHit[] searchHits = hits.getHits();
        for (SearchHit hit : searchHits) 
            String sourceAsString = hit.getSourceAsString();
            HotelDoc hotelDoc = JSON.parseObject(sourceAsString, HotelDoc.class);
            System.out.println("查询到的数据:" + hotelDoc);
        
    

    /**
     * match_all 查询所有
     */
    @Test
    public void test02() throws IOException 
        SearchRequest searchRequest = new SearchRequest("hotel");

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

        SearchHits searchHits = searchResponse.getHits();
        System.out.println("查询总条数:" + searchHits.getTotalHits().value);

        SearchHit[] hits = searchHits.getHits();
        for (SearchHit hit : hits) 
            HotelDoc hotelDoc = JSON.parseObject(hit.getSourceAsString(), HotelDoc.class);
            System.out.println("数据:" + hotelDoc);
        
    

    /**
     * term 精确查询
     */
    @Test
    public void test03() throws IOException 
        SearchRequest searchRequest = new SearchRequest();

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.termQuery("brand","万怡"));
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

        SearchHits searchHits = searchResponse.getHits();

        System.out.println("总条数:" + searchHits.getTotalHits().value);
        SearchHit[] hits = searchHits.getHits();
        for (SearchHit hit : hits) 
            HotelDoc hotelDoc = JSON.parseObject(hit.getSourceAsString(), HotelDoc.class);
            System.out.println("数据:" + hotelDoc);
        
    

    /**
     * rang 范围查询
     */
    @Test
    public void test04() throws IOException 

        SearchRequest searchRequest = new SearchRequest();

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.rangeQuery("price").gt(1000).lt(3000));
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

        SearchHits searchHits = searchResponse.getHits();
        System.out.println("总条数:" + searchHits.getTotalHits().value);
        SearchHit[] hits = searchHits.getHits();
        for (SearchHit hit : hits) 
            HotelDoc hotelDoc = JSON.parseObject(hit.getSourceAsString(), HotelDoc.class);
            System.out.println("数据:" + hotelDoc);
        
    

package cn.itcast.hotel.pojo;

import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
public class HotelDoc 
    private Long id;
    private String name;
    private String address;
    private Integer price;
    private Integer score;
    private String brand;
    private String city;
    private String starName;
    private String business;
    private String location;
    private String pic;

    public HotelDoc(Hotel hotel) 
        this.id = hotel.getId();
        this.name = hotel.getName();
        this.address = hotel.getAddress();
        this.price = hotel.getPrice();
        this.score = hotel.getScore();
        this.brand = hotel.getBrand();
        this.city = hotel.getCity();
        this.starName = hotel.getStarName();
        this.business = hotel.getBusiness();
        this.location = hotel.getLatitude() + ", " + hotel.getLongitude();
        this.pic = hotel.getPic();