JavaRestClient操作Elasticsearch分页

导包

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代码

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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.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
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;
import java.util.Map;

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

    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")
                )
        );
    }

    /**
     * 高亮
     */
    @Test
    public void findSource() throws IOException {
        //创建搜索对象
        SearchRequest searchRequest = new SearchRequest();
        // 构建查询对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //查询条件
        searchSourceBuilder.query(QueryBuilders.termQuery("字段名1", "字段中的内容"));
        //高亮对象
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        //设置高亮参数
        highlightBuilder.field("字段名1"); //参数要和查询条件字段名一样
        highlightBuilder.preTags("<span style='color:red'>");
        highlightBuilder.postTags("</span>");
        searchSourceBuilder.highlighter(highlightBuilder);

        searchRequest.source(searchSourceBuilder);
        //搜索
        SearchResponse search = client.search(searchRequest, RequestOptions.DEFAULT);
        //解析
        SearchHits hits = search.getHits();
        SearchHit[] hitsHits = hits.getHits();
        for (SearchHit hit : hits) {
            //获取数据
            String jsonStr = hit.getSourceAsString();
            //反序列化
            Item item = gson.fromJson(jsonStr, Item.class);
            //获得返回的高亮数据
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            //是否为空
            if(highlightFields!=null){
                //参数要和查询的参数一致
                HighlightField highlightField = highlightFields.get("字段名1");
                //判断是否为空
                if(highlightField.fragments()!=null&&highlightField.fragments().length>0){
                    String title = highlightField.fragments()[0].toString();
                    //设置参数将高亮的内容,替换原来的内容
                    item.setTitle(title);
                }
            }
            //打印结果
            System.out.println("结果:" item);
        }
    }
    /**
     * 后执行
     */
    @After
    public void close(){
        try {
            client.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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