ElasticSearch(7)--使用Java客户端进行基本搜索

进行基本的搜索:

包括: 查询所有、解析字符串查询、通配符查询、词条查询

package com.es.querydemo;

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

import org.elasticsearch.action.admin.indices.mapping.put.PutMappingRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.Requests;
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.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.es.bean.Product;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

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

// 词条查询
@Test
public void termQueryTermQuery(){
SearchResponse searchResponse = this.client.prepareSearch(INDEX).setTypes(TYPE)
// 搜索会忽略大小写,使用小写来搜索
.setQuery(QueryBuilders.termQuery("title", "手机"))
.get();

// 查询的总数(命中数)
SearchHits hits = searchResponse.getHits();
long totalHits = hits.getTotalHits();
System.out.println("总记录数: " + totalHits);
// 遍历查询的结果
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()){
SearchHit next = iterator.next();
// System.out.println(next.getSourceAsString());
String id = next.getId();
Map<String, Object> source = next.getSource();
Integer productId = (Integer) source.get("id");
String productTitle = (String) source.get("title");

System.out.println("Document ID: " + id);
System.out.println("商品的id: " + productId);
System.out.println("商品的title: " + productTitle);
}
}
// 通配符查询
@Test
public void searchByWildcardQuery(){
SearchResponse searchResponse = this.client.prepareSearch(INDEX).setTypes(TYPE)
// 搜索会忽略大小写,使用小写来搜索
.setQuery(QueryBuilders.wildcardQuery("title", "apple*"))
.get();

// 查询的总数(命中数)
SearchHits hits = searchResponse.getHits();
long totalHits = hits.getTotalHits();
System.out.println("总记录数: " + totalHits);
// 遍历查询的结果
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()){
SearchHit next = iterator.next();
// System.out.println(next.getSourceAsString());
String id = next.getId();
Map<String, Object> source = next.getSource();
Integer productId = (Integer) source.get("id");
String productTitle = (String) source.get("title");

System.out.println("Document ID: " + id);
System.out.println("商品的id: " + productId);
System.out.println("商品的title: " + productTitle);
}
}
// 解析字符串查询,会先分词，然后查询
@Test
public void searchByString(){
SearchResponse searchResponse = this.client.prepareSearch(INDEX).setTypes(TYPE)
.setQuery(QueryBuilders.queryStringQuery("华为手机"))
.get();

// 查询的总数(命中数)
SearchHits hits = searchResponse.getHits();
long totalHits = hits.getTotalHits();
System.out.println("总记录数: " + totalHits);
// 遍历查询的结果
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()){
SearchHit next = iterator.next();
// System.out.println(next.getSourceAsString());
String id = next.getId();
Map<String, Object> source = next.getSource();
Integer productId = (Integer) source.get("id");
String productTitle = (String) source.get("title");

System.out.println("Document ID: " + id);
System.out.println("商品的id: " + productId);
System.out.println("商品的title: " + productTitle);
}
}
// 查询所有
@Test
public void searchAll(){
SearchResponse searchResponse = this.client.prepareSearch(INDEX).setTypes(TYPE)
.setQuery(QueryBuilders.matchAllQuery())
.get();

// 查询的总数(命中数)
SearchHits hits = searchResponse.getHits();
long totalHits = hits.getTotalHits();
System.out.println("总记录数: " + totalHits);
// 遍历查询的结果
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()){
SearchHit next = iterator.next();
// System.out.println(next.getSourceAsString());
String id = next.getId();
Map<String, Object> source = next.getSource();
Integer productId = (Integer) source.get("id");
String productTitle = (String) source.get("title");

System.out.println("Document ID: " + id);
System.out.println("商品的id: " + productId);
System.out.println("商品的title: " + productTitle);
}
}

// 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();
}
}
}