分布式搜索Elasticsearch——QueryBuilders.termQuery

注：该文项目基础为分布式搜索Elasticsearch——项目过程（一）和分布式搜索Elasticsearch——项目过程（二），项目骨架可至这里下载。

ES源代码中对termQuery的描述如下所示：

/**
* A Query that matches documents containing a term.
*
* @param name  The name of the field
* @param value The value of the term
*/
public static TermQueryBuilder termQuery(String name, String value) {
return new TermQueryBuilder(name, value);
}

termQuery是我花了较多时间才了解的一种Query（因之前对Lucene的研究较少），经总结发现，termQuery中的value有以下情况：

1. 若value为汉字，则大部分情况下，只能为一个汉字；

2. 若value为英文，则是一个单词；

termQuery代码如下所示：

/**
* @author Geloin
*/
package com.geloin.esample.util;

import java.util.UUID;

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.junit.Test;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.geloin.esample.BaseTest;
import com.geloin.esample.entity.Person;

/**
* @author Geloin
*
*/
public class TermQueryTest extends BaseTest {

@Test
public void termQuery() {
String index = "user";
String type = "tb_person";
try {
// 创建索引
Person p = new Person();
p.setId(UUID.randomUUID().toString());
p.setAge(20);
p.setIsStudent(false);
p.setSex("男");
p.setName("别克");

ObjectMapper mapper = new ObjectMapper();
String source = mapper.writeValueAsString(p);

client.prepareIndex(index, type, p.getId()).setSource(source)
.execute().actionGet();

// 查询
QueryBuilder qb = QueryBuilders.termQuery("name", "别");

SearchResponse sResponse = client.prepareSearch(index)
.setTypes(type).setQuery(qb).setFrom(0).setSize(12)
.execute().actionGet();
SearchHits hits = sResponse.getHits();

if (null != hits && hits.totalHits() > 0) {
for (SearchHit hit : hits) {
String json = hit.getSourceAsString();
Person newPerson = mapper.readValue(json, Person.class);
System.out.println("name\t\t" + newPerson.getName());
System.out.println("sex\t\t" + newPerson.getSex());
System.out.println("age\t\t" + newPerson.getAge());
System.out.println("isStudent\t\t"
+ newPerson.getIsStudent());
}
} else {
log.info("没有查询到任何结果！");
}

// 防止出现：远程主机强迫关闭了一个现有的连接
Thread.sleep(100000);
} catch (Exception e) {
e.printStackTrace();
}

}
}