ElasticSearch(9)--使用Java客户端进行分页查询

分页查询

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.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.sort.SortOrder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.fasterxml.jackson.databind.ObjectMapper;

/**
* 查询
*
* @author Beck
* @date 2018年2月6日
*/
public class TestESQuery3 {
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;

// 分页查询
@Test
public void pageQuery(){
SearchRequestBuilder setQuery = this.client.prepareSearch(INDEX).setTypes(TYPE)
.setQuery(QueryBuilders.matchAllQuery())
.addSort("id", SortOrder.ASC);

// 从第几条开始,查询多少条
SearchResponse response = setQuery.setFrom(0).setSize(2).get();

SearchHits searchHits = response.getHits();
System.out.println("一共的记录数: " + searchHits.getTotalHits());

Iterator<SearchHit> iterator = searchHits.iterator();
while (iterator.hasNext()){
SearchHit searchHit = iterator.next();
System.out.println(searchHit.getSourceAsString());
}
}

// 获取客户端
@Before
public void getClient() throws Exception{
client = TransportClient.builder()
.build()
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(HOST), PORT));
}

// 关闭客户端
@After
public void closeClient(){
if (this.client != null){
this.client.close();
}
}
}