JavaRestClient操作Elasticsearch中的排序(sort)

导包

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导包可以根据 文档 里导入依赖

这里就不写依赖了

代码

代码语言：javascript复制

import com.google.gson.Gson;
import com.leyou.pojo.Item;
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.elasticsearch.search.sort.SortOrder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.io.IOException;

@RunWith(SpringRunner.class)
@SpringBootTest
public class EsdemoFindSource {

    private RestHighLevelClient client;

    private Gson gson = new Gson();
    /**
     * 先执行
     */
    @Before
    public void init (){
        // 初始化HighLevel客户端
        client = new RestHighLevelClient(
                RestClient.builder(
                        HttpHost.create("http://127.0.0.1:9201"),
                        HttpHost.create("http://127.0.0.1:9202"),
                        HttpHost.create("http://127.0.0.1:9203")
                )
        );
    }

    /**
     * source过滤
     */
    @Test
    public void findSource() throws IOException {
       //创建搜索对象
        SearchRequest searchRequest = new SearchRequest();
        //构建查询工具
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //查询条件
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        //排序条件,SortOrder.ASC:升序,SortOrder.DESC:降序
        searchSourceBuilder.sort("字段名", SortOrder.DESC);
        searchRequest.source(searchSourceBuilder);
        //搜索
        SearchResponse search = client.search(searchRequest, RequestOptions.DEFAULT);
        //解析
        SearchHit[] hits = search.getHits().getHits();
        for (SearchHit hit : hits) {
            //获取数据
            String sourceString = hit.getSourceAsString();
            //反序列化
            Item item = gson.fromJson(sourceString, Item.class);
            //打印
            System.out.println("结果:" item);
        }

    }

    /**
     * 后执行
     */
    @After
    public void close(){
        try {
            client.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

java elasticsearch

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