java 查es

1.1依赖

      <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>6.8.5</version>
        </dependency>

 

 

1.2代码

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.BoolQueryBuilder;
import org.elasticsearch.index.query.IdsQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.io.IOException;

public class RestClientTest {
    public static void main(String[] args) throws IOException {
        HttpHost httpHost = new HttpHost("localhost",9200);
        RestHighLevelClient restHighLevelClient = new RestHighLevelClient(RestClient.builder(httpHost));

        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        IdsQueryBuilder idsQueryBuilder = QueryBuilders.idsQuery().addIds("com.fa.qq");
        boolQueryBuilder.must(idsQueryBuilder);
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(boolQueryBuilder);

        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("app_list_dim");
        searchRequest.source( searchSourceBuilder );
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        SearchHits hits = searchResponse.getHits();
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
    }
}

 

 

 

 

2.1依赖

 <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>6.2.4</version>
        </dependency>

2.2代码

import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.index.query.MatchAllQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.transport.client.PreBuiltTransportClient;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class EsClient {
    public static void main(String[] args) throws UnknownHostException {
        //指定集群
        Settings settings = Settings.builder().put("cluster.name", "elasticsearch").build();
        // 创建访问es的客户端，es中，9200是http通讯的端口号，9300 是tcp通讯的端口号
        TransportClient client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"),9300));
        // 数据查询
//        GetResponse response = client.prepareGet("lib3", "user", "1").execute().actionGet();
        // 查询所有
//        MatchAllQueryBuilder query = QueryBuilders.matchAllQuery();

        // term 查询
        TermQueryBuilder query = QueryBuilders.termQuery("interests", "喜欢喝酒");
        SearchResponse response = client.prepareSearch("lib3")
                .setTypes("user")
                .setQuery(query)
//                .setSize(3)
                .get();
        for (SearchHit hit : response.getHits()) {
            System.out.println(hit.getSourceAsString());
        }
        client.close();
    }
}