elasticSearch索引库查询的相关方法

package com.hope.es;

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.QueryStringQueryBuilder;
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.elasticsearch.transport.client.PreBuiltTransportClient;
import org.junit.Before;
import org.junit.Test;

import java.net.InetAddress;
import java.util.Iterator;
import java.util.Map;

/**
 * @author newcityman
 * @date 2020/1/16 - 23:56
 */
public class SearchIndex {
    private TransportClient client;

    @Before
    public void init() throws Exception {
        //1、创建一个setting对象
        Settings settings = Settings.builder().
                put("cluster.name", "my‐elasticsearch").build();
        //2、创建一个TransportClient对象，
        client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9301))
                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9302))
                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9303));
    }

    public void search(QueryBuilder queryBuilder) throws Exception {
        //3、执行查询结果
        SearchResponse searchResponse = client.prepareSearch("index_hello")
                .setTypes("article")
                .setQuery(queryBuilder)
                //设置分页信息
                .setFrom(0)
                //每页显示的页数
                .setSize(5)
                .get();
        //4、取查询结果
        SearchHits searchHits = searchResponse.getHits();
        //5、取查询结果的总记录数
        System.out.println("总记录数：" + searchHits.getTotalHits());
        //6、查询结果列表
        Iterator<SearchHit> iterator = searchHits.iterator();
        while (iterator.hasNext()) {
            SearchHit searchHit = iterator.next();
            //打印文档对象，以json格式输出
            System.out.println(searchHit.getSourceAsString());
            //取文档的属性
            System.out.println("+++++++++++++++++++文档的属性");
            Map<String, Object> document = searchHit.getSource();
            System.out.println(document.get("id"));
            System.out.println(document.get("title"));
            System.out.println(document.get("content"));
        }
        //7、关闭client
        client.close();
    }

    /**
     * 根据id查询
     */

    @Test
    public void testSearchById() throws Exception {
        //1、创建一个client对象
        //2、创建一个查询对象
        QueryBuilder queryBuilder = QueryBuilders.idsQuery().addIds("4", "5", "6");
        //执行查询
        search(queryBuilder);
    }

    /**
     * 根据关键词查询
     * @throws Exception
     */
    @Test
    public void testSearchByTerm() throws Exception{
        //创建client对象
        //创建查询对象
        //参数一：要搜索的字段
        //参数二：要搜索的关键词
        QueryBuilder queryBuilder = QueryBuilders.termQuery("content", "政府");
        search(queryBuilder);
    }

    @Test
    public void testQueryStringQuery() throws  Exception{
        //创建一个QueryBuilder对象
        QueryStringQueryBuilder query = QueryBuilders.queryStringQuery("澳洲火气大")
                .defaultField("title");
        //执行查询
        search(query,"title");
    }

    public void search(QueryBuilder queryBuilder,String highlightField) throws Exception {
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        //高亮显示的字段
        highlightBuilder.field(highlightField);
        //高亮显示的字段前缀
        highlightBuilder.preTags("<em>");
        highlightBuilder.postTags("</em>");
        //3、执行查询结果
        SearchResponse searchResponse = client.prepareSearch("index_hello")
                .setTypes("article")
                .setQuery(queryBuilder)
                //设置分页信息
                .setFrom(0)
                //每页显示的页数
                .setSize(5)
                .highlighter(highlightBuilder)
                .get();
        //4、取查询结果
        SearchHits searchHits = searchResponse.getHits();
        //5、取查询结果的总记录数
        System.out.println("总记录数：" + searchHits.getTotalHits());
        //6、查询结果列表
        Iterator<SearchHit> iterator = searchHits.iterator();
        while (iterator.hasNext()) {
            SearchHit searchHit = iterator.next();
            //打印文档对象，以json格式输出
            System.out.println(searchHit.getSourceAsString());
            //取文档的属性
            System.out.println("==================文档的属性");
            Map<String, Object> document = searchHit.getSource();
            System.out.println(document.get("id"));
            System.out.println(document.get("title"));
            System.out.println(document.get("content"));
            System.out.println("*********高亮结果");
            Map<String, HighlightField> highlightFields = searchHit.getHighlightFields();
            System.out.println(highlightFields);
            //取title高亮显示的结果
            HighlightField field = highlightFields.get(highlightField);
            Text[] fragments = field.getFragments();
            if(fragments!=null){
                String title = fragments[0].toString();
                System.out.println("title:="+title);
            }
        }
        //7、关闭client
        client.close();
    }

}
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