ElasticSearch(10)--使用Java客戶端進行高亮顯示

高亮顯示:

package com.es.querydemo;

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

import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * 查詢
 * 
 * @author Beck
 * @date 2018年2月6日
 */
public class TestESQuery4 {
	private static final String HOST = "127.0.0.1";
	private static final int PORT = 9300;
	
	private static final String INDEX = "eshop";
	private static final String TYPE = "product";
	
	private static final ObjectMapper MAPPER = new ObjectMapper();
	
	private TransportClient client = null;
	
	
	// 查詢結果高亮顯示
	@Test
	public void pageQuery(){
		SearchRequestBuilder searchRequestBuilder = this.client.prepareSearch(INDEX).setTypes(TYPE)
		.setQuery(QueryBuilders.matchQuery("title", "華爲手機"));
		
		searchRequestBuilder.addHighlightedField("title");
		searchRequestBuilder.setHighlighterPreTags("<em>");
		searchRequestBuilder.setHighlighterPostTags("</em>");
		// 設置摘要大小
		searchRequestBuilder.setHighlighterFragmentSize(10);
		SearchResponse response = searchRequestBuilder.get();
		
		SearchHits searchHits = response.getHits();
		System.out.println("一共的記錄數: " + searchHits.getTotalHits());
		
		Iterator<SearchHit> iterator = searchHits.iterator();
		while (iterator.hasNext()){
			SearchHit searchHit = iterator.next();
			System.out.println(searchHit.getSourceAsString());
			
			// 獲取高亮內容
			Map<String, HighlightField> highlightFields = searchHit.getHighlightFields();
			HighlightField highlightField = highlightFields.get("title");
			Text[] texts = highlightField.getFragments();
			String title = "";
			for (Text text : texts) {
				title += text;
			}
			System.out.println(title);
		}
	}
	
	// 獲取客戶端
	@Before
	public void getClient() throws Exception{
		client = TransportClient.builder()
		.build()
		.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(HOST), PORT));
	}
	
	// 關閉客戶端
	@After
	public void closeClient(){
		if (this.client != null){
			this.client.close();
		}
	}
}