SpringBoot 操作 ElasticSearch 详解(万字长文)_数据

一、ElasticSearch 简介

1、简介

ElasticSearch 是一个基于 Lucene 的搜索服务器。它提供了一个分布式多员工能力的全文搜索引擎,基于 RESTful web 接口。Elasticsearch 是用 Java 语言开发的,并作为 Apache 许可条款下的开放源码发布,是一种流行的企业级搜索引擎。

ElasticSearch 用于云计算中,能够达到实时搜索,稳定,可靠,快速,安装使用方便。

2、特性

  • 分布式的文档存储引擎
  • 分布式的搜索引擎和分析引擎
  • 分布式,支持PB级数据

3、使用场景

  • 搜索领域:如百度、谷歌,全文检索等。
  • 门户网站:访问统计、文章点赞、留言评论等。
  • 广告推广:记录员工行为数据、消费趋势、员工群体进行定制推广等。
  • 信息采集:记录应用的埋点数据、访问日志数据等,方便大数据进行分析。

二、ElasticSearch 基础概念

1、ElaticSearch 和 DB 的关系

在 Elasticsearch 中,文档归属于一种类型 type,而这些类型存在于索引 index 中,我们可以列一些简单的不同点,来类比传统关系型数据库:

  • Relational DB -> Databases -> Tables -> Rows -> Columns
  • Elasticsearch -> Indices -> Types -> Documents -> Fields

Elasticsearch 集群可以包含多个索引 indices,每一个索引可以包含多个类型 types,每一个类型包含多个文档 documents,然后每个文档包含多个字段 Fields。而在 DB 中可以有多个数据库 Databases,每个库中可以有多张表 Tables,没个表中又包含多行Rows,每行包含多列Columns。

2、索引

索引基本概念(indices):

索引是含义相同属性的文档集合,是 ElasticSearch 的一个逻辑存储,可以理解为关系型数据库中的数据库,ElasticSearch 可以把索引数据存放到一台服务器上,也可以 sharding 后存到多台服务器上,每个索引有一个或多个分片,每个分片可以有多个副本。

索引类型(index_type):

索引可以定义一个或多个类型,文档必须属于一个类型。在 ElasticSearch 中,一个索引对象可以存储多个不同用途的对象,通过索引类型可以区分单个索引中的不同对象,可以理解为关系型数据库中的表。每个索引类型可以有不同的结构,但是不同的索引类型不能为相同的属性设置不同的类型。

3、文档

文档(document):

文档是可以被索引的基本数据单位。存储在 ElasticSearch 中的主要实体叫文档 document,可以理解为关系型数据库中表的一行记录。每个文档由多个字段构成,ElasticSearch 是一个非结构化的数据库,每个文档可以有不同的字段,并且有一个唯一的标识符。

4、映射

映射(mapping):

ElasticSearch 的 Mapping 非常类似于静态语言中的数据类型:声明一个变量为 int 类型的变量,以后这个变量都只能存储 int 类型的数据。同样的,一个 number 类型的 mapping 字段只能存储 number 类型的数据。

同语言的数据类型相比,Mapping 还有一些其他的含义,Mapping 不仅告诉 ElasticSearch 一个 Field 中是什么类型的值, 它还告诉 ElasticSearch 如何索引数据以及数据是否能被搜索到。

ElaticSearch 默认是动态创建索引和索引类型的 Mapping 的。这就相当于无需定义 Solr 中的 Schema,无需指定各个字段的索引规则就可以索引文件,很方便。但有时方便就代表着不灵活。比如,ElasticSearch 默认一个字段是要做分词的,但我们有时要搜索匹配整个字段却不行。如有统计工作要记录每个城市出现的次数。对于 name 字段,若记录 new york 文本,ElasticSearch 可能会把它拆分成 new 和 york 这两个词,分别计算这个两个单词的次数,而不是我们期望的 new york。

三、SpringBoot 项目引入 ElasticSearch 依赖

下面介绍下 SpringBoot 如何通过 elasticsearch-rest-high-level-client 工具操作 ElasticSearch,这里需要说一下,为什么没有使用 Spring 家族封装的 spring-data-elasticsearch。

主要原因是灵活性和更新速度,Spring 将 ElasticSearch 过度封装,让开发者很难跟 ES 的 DSL 查询语句进行关联。再者就是更新速度,ES 的更新速度是非常快,但是 spring-data-elasticsearch 更新速度比较缓慢。

由于上面两点,所以选择了官方推出的 Java 客户端 elasticsearch-rest-high-level-client,它的代码写法跟 DSL 语句很相似,懂 ES 查询的使用其上手很快。


示例项目地址:https://github.com/my-dlq/blog-example/tree/master/springboot/springboot-elasticsearch-example


1、Maven 引入相关依赖

  • lombok:lombok 工具依赖。
  • fastjson:用于将 JSON 转换对象的依赖。
  • spring-boot-starter-web: SpringBoot 的 Web 依赖。
  • elasticsearch:ElasticSearch:依赖,需要和 ES 版本保持一致。
  • elasticsearch-rest-high-level-client:用于操作 ES 的 Java 客户端。
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>club.mydlq</groupId>
<artifactId>springboot-elasticsearch-example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-elasticsearch-example</name>
<description>Demo project for Spring Boot ElasticSearch</description>

<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!--web-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.61</version>
</dependency>
<!--elasticsearch-->
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>6.5.4</version>
</dependency>
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>6.5.4</version>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

2、ElasticSearch 连接配置

(1)、application.yml 配置文件

为了方便更改连接 ES 的连接配置,所以我们将配置信息放置于 application.yaml 中:

#base
server:
port: 8080
#spring
spring:
application:
name: springboot-elasticsearch-example
#elasticsearch
elasticsearch:
schema: http
address: 127.0.0.1:9200
connectTimeout: 5000
socketTimeout: 5000
connectionRequestTimeout: 5000
maxConnectNum: 100
maxConnectPerRoute: 100

(2)、java 连接配置类

这里需要写一个 Java 配置类读取 application 中的配置信息:

import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.ArrayList;
import java.util.List;

/**
* ElasticSearch 配置
*/
@Configuration
public class ElasticSearchConfig {

/** 协议 */
@Value("${elasticsearch.schema:http}")
private String schema;

/** 集群地址,如果有多个用“,”隔开 */
@Value("${elasticsearch.address}")
private String address;

/** 连接超时时间 */
@Value("${elasticsearch.connectTimeout:5000}")
private int connectTimeout;

/** Socket 连接超时时间 */
@Value("${elasticsearch.socketTimeout:10000}")
private int socketTimeout;

/** 获取连接的超时时间 */
@Value("${elasticsearch.connectionRequestTimeout:5000}")
private int connectionRequestTimeout;

/** 最大连接数 */
@Value("${elasticsearch.maxConnectNum:100}")
private int maxConnectNum;

/** 最大路由连接数 */
@Value("${elasticsearch.maxConnectPerRoute:100}")
private int maxConnectPerRoute;

@Bean
public RestHighLevelClient restHighLevelClient() {
// 拆分地址
List<HttpHost> hostLists = new ArrayList<>();
String[] hostList = address.split(",");
for (String addr : hostList) {
String host = addr.split(":")[0];
String port = addr.split(":")[1];
hostLists.add(new HttpHost(host, Integer.parseInt(port), schema));
}
// 转换成 HttpHost 数组
HttpHost[] httpHost = hostLists.toArray(new HttpHost[]{});
// 构建连接对象
RestClientBuilder builder = RestClient.builder(httpHost);
// 异步连接延时配置
builder.setRequestConfigCallback(requestConfigBuilder -> {
requestConfigBuilder.setConnectTimeout(connectTimeout);
requestConfigBuilder.setSocketTimeout(socketTimeout);
requestConfigBuilder.setConnectionRequestTimeout(connectionRequestTimeout);
return requestConfigBuilder;
});
// 异步连接数配置
builder.setHttpClientConfigCallback(httpClientBuilder -> {
httpClientBuilder.setMaxConnTotal(maxConnectNum);
httpClientBuilder.setMaxConnPerRoute(maxConnectPerRoute);
return httpClientBuilder;
});
return new RestHighLevelClient(builder);
}

}

四、索引操作示例

这里示例会指出通过 Kibana 的 ​​Restful​​​ 工具操作与对应的 Java 代码操作的两个示例。扩展:某小公司RESTful、共用接口、前后端分离、接口约定的实践

1、Restful 操作示例

创建索引

创建名为 mydlq-user 的索引与对应 Mapping。

PUT /mydlq-user
{
"mappings": {
"doc": {
"dynamic": true,
"properties": {
"name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword"
}
}
},
"address": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword"
}
}
},
"remark": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword"
}
}
},
"age": {
"type": "integer"
},
"salary": {
"type": "float"
},
"birthDate": {
"type": "date",
"format": "yyyy-MM-dd"
},
"createTime": {
"type": "date"
}
}
}
}
}

删除索引

删除 mydlq-user 索引。

DELETE /mydlq-user

2、Java 代码示例

import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;

@Slf4j
@Service
public class IndexService2 {

@Autowired
private RestHighLevelClient restHighLevelClient;

/**
* 创建索引
*/
public void createIndex() {
try {
// 创建 Mapping
XContentBuilder mapping = XContentFactory.jsonBuilder()
.startObject()
.field("dynamic", true)
.startObject("properties")
.startObject("name")
.field("type","text")
.startObject("fields")
.startObject("keyword")
.field("type","keyword")
.endObject()
.endObject()
.endObject()
.startObject("address")
.field("type","text")
.startObject("fields")
.startObject("keyword")
.field("type","keyword")
.endObject()
.endObject()
.endObject()
.startObject("remark")
.field("type","text")
.startObject("fields")
.startObject("keyword")
.field("type","keyword")
.endObject()
.endObject()
.endObject()
.startObject("age")
.field("type","integer")
.endObject()
.startObject("salary")
.field("type","float")
.endObject()
.startObject("birthDate")
.field("type","date")
.field("format", "yyyy-MM-dd")
.endObject()
.startObject("createTime")
.field("type","date")
.endObject()
.endObject()
.endObject();
// 创建索引配置信息,配置
Settings settings = Settings.builder()
.put("index.number_of_shards", 1)
.put("index.number_of_replicas", 0)
.build();
// 新建创建索引请求对象,然后设置索引类型(ES 7.0 将不存在索引类型)和 mapping 与 index 配置
CreateIndexRequest request = new CreateIndexRequest("mydlq-user", settings);
request.mapping("doc", mapping);
// RestHighLevelClient 执行创建索引
CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
// 判断是否创建成功
boolean isCreated = createIndexResponse.isAcknowledged();
log.info("是否创建成功:{}", isCreated);
} catch (IOException e) {
log.error("", e);
}
}

/**
* 删除索引
*/
public void deleteIndex() {
try {
// 新建删除索引请求对象
DeleteIndexRequest request = new DeleteIndexRequest("mydlq-user");
// 执行删除索引
AcknowledgedResponse acknowledgedResponse = restHighLevelClient.indices().delete(request, RequestOptions.DEFAULT);
// 判断是否删除成功
boolean siDeleted = acknowledgedResponse.isAcknowledged();
log.info("是否删除成功:{}", siDeleted);
} catch (IOException e) {
log.error("", e);
}
}

}

五、文档操作示例

1、Restful 操作示例

增加文档信息

在索引 mydlq-user 中增加一条文档信息。

POST /mydlq-user/doc
{
"address": "北京市",
"age": 29,
"birthDate": "1990-01-10",
"createTime": 1579530727699,
"name": "张三",
"remark": "来自北京市的张先生",
"salary": 100
}

获取文档信息

获取 mydlq-user 的索引 id=1 的文档信息。

GET /mydlq-user/doc/1

更新文档信息

更新之前创建的 id=1 的文档信息。

PUT /mydlq-user/doc/1
{
"address": "北京市海淀区",
"age": 29,
"birthDate": "1990-01-10",
"createTime": 1579530727699,
"name": "张三",
"remark": "来自北京市的张先生",
"salary": 100
}

删除文档信息

删除之前创建的 id=1 的文档信息。

DELETE /mydlq-user/doc/1

2、Java 代码示例

import club.mydlq.elasticsearch.model.entity.UserInfo;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.util.Date;

@Slf4j
@Service
public class IndexService {

@Autowired
private RestHighLevelClient restHighLevelClient;

/**
* 增加文档信息
*/
public void addDocument() {
try {
// 创建索引请求对象
IndexRequest indexRequest = new IndexRequest("mydlq-user", "doc", "1");
// 创建员工信息
UserInfo userInfo = new UserInfo();
userInfo.setName("张三");
userInfo.setAge(29);
userInfo.setSalary(100.00f);
userInfo.setAddress("北京市");
userInfo.setRemark("来自北京市的张先生");
userInfo.setCreateTime(new Date());
userInfo.setBirthDate("1990-01-10");
// 将对象转换为 byte 数组
byte[] json = JSON.toJSONBytes(userInfo);
// 设置文档内容
indexRequest.source(json, XContentType.JSON);
// 执行增加文档
IndexResponse response = restHighLevelClient.index(indexRequest, RequestOptions.DEFAULT);
log.info("创建状态:{}", response.status());
} catch (Exception e) {
log.error("", e);
}
}

/**
* 获取文档信息
*/
public void getDocument() {
try {
// 获取请求对象
GetRequest getRequest = new GetRequest("mydlq-user", "doc", "1");
// 获取文档信息
GetResponse getResponse = restHighLevelClient.get(getRequest, RequestOptions.DEFAULT);
// 将 JSON 转换成对象
if (getResponse.isExists()) {
UserInfo userInfo = JSON.parseObject(getResponse.getSourceAsBytes(), UserInfo.class);
log.info("员工信息:{}", userInfo);
}
} catch (IOException e) {
log.error("", e);
}
}

/**
* 更新文档信息
*/
public void updateDocument() {
try {
// 创建索引请求对象
UpdateRequest updateRequest = new UpdateRequest("mydlq-user", "doc", "1");
// 设置员工更新信息
UserInfo userInfo = new UserInfo();
userInfo.setSalary(200.00f);
userInfo.setAddress("北京市海淀区");
// 将对象转换为 byte 数组
byte[] json = JSON.toJSONBytes(userInfo);
// 设置更新文档内容
updateRequest.doc(json, XContentType.JSON);
// 执行更新文档
UpdateResponse response = restHighLevelClient.update(updateRequest, RequestOptions.DEFAULT);
log.info("创建状态:{}", response.status());
} catch (Exception e) {
log.error("", e);
}
}

/**
* 删除文档信息
*/
public void deleteDocument() {
try {
// 创建删除请求对象
DeleteRequest deleteRequest = new DeleteRequest("mydlq-user", "doc", "1");
// 执行删除文档
DeleteResponse response = restHighLevelClient.delete(deleteRequest, RequestOptions.DEFAULT);
log.info("删除状态:{}", response.status());
} catch (IOException e) {
log.error("", e);
}
}

}

六、插入初始化数据

执行查询示例前,先往索引中插入一批数据:

1、单条插入

POST mydlq-user/_doc

{"name":"零零","address":"北京市丰台区","remark":"低层员工","age":29,"salary":3000,"birthDate":"1990-11-11","createTime":"2019-11-11T08:18:00.000Z"}

2、批量插入

POST _bulk

{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"刘一","address":"北京市丰台区","remark":"低层员工","age":30,"salary":3000,"birthDate":"1989-11-11","createTime":"2019-03-15T08:18:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"陈二","address":"北京市昌平区","remark":"中层员工","age":27,"salary":7900,"birthDate":"1992-01-25","createTime":"2019-11-08T11:15:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"张三","address":"北京市房山区","remark":"中层员工","age":28,"salary":8800,"birthDate":"1991-10-05","createTime":"2019-07-22T13:22:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"李四","address":"北京市大兴区","remark":"高层员工","age":26,"salary":9000,"birthDate":"1993-08-18","createTime":"2019-10-17T15:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"王五","address":"北京市密云区","remark":"低层员工","age":31,"salary":4800,"birthDate":"1988-07-20","createTime":"2019-05-29T09:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"赵六","address":"北京市通州区","remark":"中层员工","age":32,"salary":6500,"birthDate":"1987-06-02","createTime":"2019-12-10T18:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"孙七","address":"北京市朝阳区","remark":"中层员工","age":33,"salary":7000,"birthDate":"1986-04-15","createTime":"2019-06-06T13:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"周八","address":"北京市西城区","remark":"低层员工","age":32,"salary":5000,"birthDate":"1987-09-26","createTime":"2019-01-26T14:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"吴九","address":"北京市海淀区","remark":"高层员工","age":30,"salary":11000,"birthDate":"1989-11-25","createTime":"2019-09-07T13:34:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"郑十","address":"北京市东城区","remark":"低层员工","age":29,"salary":5000,"birthDate":"1990-12-25","createTime":"2019-03-06T12:08:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"萧十一","address":"北京市平谷区","remark":"低层员工","age":29,"salary":3300,"birthDate":"1990-11-11","createTime":"2019-03-10T08:17:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"曹十二","address":"北京市怀柔区","remark":"中层员工","age":27,"salary":6800,"birthDate":"1992-01-25","createTime":"2019-12-03T11:09:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"吴十三","address":"北京市延庆区","remark":"中层员工","age":25,"salary":7000,"birthDate":"1994-10-05","createTime":"2019-07-27T14:22:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"冯十四","address":"北京市密云区","remark":"低层员工","age":25,"salary":3000,"birthDate":"1994-08-18","createTime":"2019-04-22T15:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"蒋十五","address":"北京市通州区","remark":"低层员工","age":31,"salary":2800,"birthDate":"1988-07-20","createTime":"2019-06-13T10:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"苗十六","address":"北京市门头沟区","remark":"高层员工","age":32,"salary":11500,"birthDate":"1987-06-02","createTime":"2019-11-11T18:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"鲁十七","address":"北京市石景山区","remark":"高员工","age":33,"salary":9500,"birthDate":"1986-04-15","createTime":"2019-06-06T14:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"沈十八","address":"北京市朝阳区","remark":"中层员工","age":31,"salary":8300,"birthDate":"1988-09-26","createTime":"2019-09-25T14:00:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"吕十九","address":"北京市西城区","remark":"低层员工","age":31,"salary":4500,"birthDate":"1988-11-25","createTime":"2019-09-22T13:34:00.000Z"}
{"index":{"_index":"mydlq-user","_type":"doc"}}
{"name":"丁二十","address":"北京市东城区","remark":"低层员工","age":33,"salary":2100,"birthDate":"1986-12-25","createTime":"2019-03-07T12:08:00.000Z"}

3、查询数据

插入完成后再查询数据,查看之前插入的数据是否存在:

GET mydlq-user/_search

执行后得到下面记录:

{
"took": 2,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 20,
"max_score": 1,
"hits": [
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "BeN0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "刘一",
"address": "北京市丰台区",
"remark": "低层员工",
"age": 30,
"salary": 3000,
"birthDate": "1989-11-11",
"createTime": "2019-03-15T08:18:00.000Z"
}
},
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "BuN0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "陈二",
"address": "北京市昌平区",
"remark": "中层员工",
"age": 27,
"salary": 7900,
"birthDate": "1992-01-25",
"createTime": "2019-11-08T11:15:00.000Z"
}
},
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "B-N0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "张三",
"address": "北京市房山区",
"remark": "中层员工",
"age": 28,
"salary": 8800,
"birthDate": "1991-10-05",
"createTime": "2019-07-22T13:22:00.000Z"
}
},
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "CON0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "李四",
"address": "北京市大兴区",
"remark": "高层员工",
"age": 26,
"salary": 9000,
"birthDate": "1993-08-18",
"createTime": "2019-10-17T15:00:00.000Z"
}
},
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "CeN0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "王五",
"address": "北京市密云区",
"remark": "低层员工",
"age": 31,
"salary": 4800,
"birthDate": "1988-07-20",
"createTime": "2019-05-29T09:00:00.000Z"
}
},
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "CuN0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "赵六",
"address": "北京市通州区",
"remark": "中层员工",
"age": 32,
"salary": 6500,
"birthDate": "1987-06-02",
"createTime": "2019-12-10T18:00:00.000Z"
}
},
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "C-N0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "孙七",
"address": "北京市朝阳区",
"remark": "中层员工",
"age": 33,
"salary": 7000,
"birthDate": "1986-04-15",
"createTime": "2019-06-06T13:00:00.000Z"
}
},
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "DON0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "周八",
"address": "北京市西城区",
"remark": "低层员工",
"age": 32,
"salary": 5000,
"birthDate": "1987-09-26",
"createTime": "2019-01-26T14:00:00.000Z"
}
},
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "DeN0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "吴九",
"address": "北京市海淀区",
"remark": "高层员工",
"age": 30,
"salary": 11000,
"birthDate": "1989-11-25",
"createTime": "2019-09-07T13:34:00.000Z"
}
},
{
"_index": "mydlq-user",
"_type": "_doc",
"_id": "DuN0BW8B7BNodGwRFTRj",
"_score": 1,
"_source": {
"name": "郑十",
"address": "北京市东城区",
"remark": "低层员工",
"age": 29,
"salary": 5000,
"birthDate": "1990-12-25",
"createTime": "2019-03-06T12:08:00.000Z"
}
}
]
}
}

七、查询操作示例

1、精确查询(term)

(1)、Restful 操作示例

精确查询

精确查询,查询地址为 北京市通州区 的人员信息:

查询条件不会进行分词,但是查询内容可能会分词,导致查询不到。之前在创建索引时设置 Mapping 中 address 字段存在 keyword 字段是专门用于不分词查询的子字段。

GET mydlq-user/_search
{
"query": {
"term": {
"address.keyword": {
"value": "北京市通州区"
}
}
}
}

精确查询-多内容查询

精确查询,查询地址为 北京市丰台区、北京市昌平区 或 北京市大兴区 的人员信息:

GET mydlq-user/_search
{
"query": {
"terms": {
"address.keyword": [
"北京市丰台区",
"北京市昌平区",
"北京市大兴区"
]
}
}
}

(2)、Java 代码示例

import club.mydlq.elasticsearch.model.entity.UserInfo;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;

@Slf4j
@Service
public class TermQueryService {

@Autowired
private RestHighLevelClient restHighLevelClient;

/**
* 精确查询(查询条件不会进行分词,但是查询内容可能会分词,导致查询不到)
*/
public void termQuery() {
try {
// 构建查询条件(注意:termQuery 支持多种格式查询,如 boolean、int、double、string 等,这里使用的是 string 的查询)
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.termQuery("address.keyword", "北京市通州区"));
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

/**
* 多个内容在一个字段中进行查询
*/
public void termsQuery() {
try {
// 构建查询条件(注意:termsQuery 支持多种格式查询,如 boolean、int、double、string 等,这里使用的是 string 的查询)
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.termsQuery("address.keyword", "北京市丰台区", "北京市昌平区", "北京市大兴区"));
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

}

2、匹配查询(match)

(1)、Restful 操作示例

匹配查询全部数据与分页

匹配查询符合条件的所有数据,并且设置以 salary 字段升序排序,并设置分页:

GET mydlq-user/_search
{
"query": {
"match_all": {}
},
"from": 0,
"size": 10,
"sort": [
{
"salary": {
"order": "asc"
}
}
]
}

匹配查询数据

匹配查询地址为 通州区 的数据:

GET mydlq-user/_search
{
"query": {
"match": {
"address": "通州区"
}
}
}

词语匹配查询

词语匹配进行查询,匹配 address 中为 北京市通州区 的员工信息:

GET mydlq-user/_search
{
"query": {
"match_phrase": {
"address": "北京市通州区"
}
}
}

内容多字段查询

查询在字段 address、remark 中存在 北京 内容的员工信息:

GET mydlq-user/_search
{
"query": {
"multi_match": {
"query": "北京",
"fields": ["address","remark"]
}
}
}

(2)、Java 代码示例

import club.mydlq.elasticsearch.model.entity.UserInfo;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.MatchAllQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;

@Slf4j
@Service
public class MatchQueryService {

@Autowired
private RestHighLevelClient restHighLevelClient;

/**
* 匹配查询符合条件的所有数据,并设置分页
*/
public Object matchAllQuery() {
try {
// 构建查询条件
MatchAllQueryBuilder matchAllQueryBuilder = QueryBuilders.matchAllQuery();
// 创建查询源构造器
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(matchAllQueryBuilder);
// 设置分页
searchSourceBuilder.from(0);
searchSourceBuilder.size(3);
// 设置排序
searchSourceBuilder.sort("salary", SortOrder.ASC);
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

/**
* 匹配查询数据
*/
public Object matchQuery() {
try {
// 构建查询条件
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchQuery("address", "*通州区"));
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

/**
* 词语匹配查询
*/
public Object matchPhraseQuery() {
try {
// 构建查询条件
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchPhraseQuery("address", "北京市通州区"));
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

/**
* 内容在多字段中进行查询
*/
public Object matchMultiQuery() {
try {
// 构建查询条件
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.multiMatchQuery("北京市", "address", "remark"));
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

}

3、模糊查询(fuzzy)

(1)、Restful 操作示例

模糊查询所有以 三 结尾的姓名

GET mydlq-user/_search
{
"query": {
"fuzzy": {
"name": "三"
}
}
}

(2)、Java 代码示例

import club.mydlq.elasticsearch.model.entity.UserInfo;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;

@Slf4j
@Service
public class FuzzyQueryService {

@Autowired
private RestHighLevelClient restHighLevelClient;

/**
* 模糊查询所有以 “三” 结尾的姓名
*/
public Object fuzzyQuery() {
try {
// 构建查询条件
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.fuzzyQuery("name", "三").fuzziness(Fuzziness.AUTO));
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

}

4、范围查询(range)

(1)、Restful 操作示例

查询岁数 ≥ 30 岁的员工数据:

GET /mydlq-user/_search
{
"query": {
"range": {
"age": {
"gte": 30
}
}
}
}

查询生日距离现在 30 年间的员工数据:

GET mydlq-user/_search
{
"query": {
"range": {
"birthDate": {
"gte": "now-30y"
}
}
}
}

(2)、Java 代码示例

import club.mydlq.elasticsearch.model.entity.UserInfo;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;

@Slf4j
@Service
public class RangeQueryService {

@Autowired
private RestHighLevelClient restHighLevelClient;

/**
* 查询岁数 ≥ 30 岁的员工数据
*/
public void rangeQuery() {
try {
// 构建查询条件
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.rangeQuery("age").gte(30));
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

/**
* 查询距离现在 30 年间的员工数据
* [年(y)、月(M)、星期(w)、天(d)、小时(h)、分钟(m)、秒(s)]
* 例如:
* now-1h 查询一小时内范围
* now-1d 查询一天内时间范围
* now-1y 查询最近一年内的时间范围
*/
public void dateRangeQuery() {
try {
// 构建查询条件
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
// includeLower(是否包含下边界)、includeUpper(是否包含上边界)
searchSourceBuilder.query(QueryBuilders.rangeQuery("birthDate")
.gte("now-30y").includeLower(true).includeUpper(true));
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

}

5、通配符查询(wildcard)

(1)、Restful 操作示例

查询所有以 “三” 结尾的姓名:

GET mydlq-user/_search
{
"query": {
"wildcard": {
"name.keyword": {
"value": "*三"
}
}
}
}

(2)、Java 代码示例

import club.mydlq.elasticsearch.model.entity.UserInfo;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;

@Slf4j
@Service
public class WildcardQueryService {

@Autowired
private RestHighLevelClient restHighLevelClient;

/**
* 查询所有以 “三” 结尾的姓名
*
* *:表示多个字符(0个或多个字符)
* ?:表示单个字符
*/
public Object wildcardQuery() {
try {
// 构建查询条件
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.wildcardQuery("name.keyword", "*三"));
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
} catch (IOException e) {
log.error("", e);
}
}

}

6、布尔查询(bool)

(1)、Restful 操作示例

查询出生在 1990-1995 年期间,且地址在 北京市昌平区、北京市大兴区、北京市房山区 的员工信息:

GET /mydlq-user/_search
{
"query": {
"bool": {
"filter": {
"range": {
"birthDate": {
"format": "yyyy",
"gte": 1990,
"lte": 1995
}
}
},
"must": [
{
"terms": {
"address.keyword": [
"北京市昌平区",
"北京市大兴区",
"北京市房山区"
]
}
}
]
}
}
}

(2)、Java 代码示例

import club.mydlq.elasticsearch.model.entity.UserInfo;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;

@Slf4j
@Service
public class BoolQueryService {

@Autowired
private RestHighLevelClient restHighLevelClient;

public Object boolQuery() {
try {
// 创建 Bool 查询构建器
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
// 构建查询条件
boolQueryBuilder.must(QueryBuilders.termsQuery("address.keyword", "北京市昌平区", "北京市大兴区", "北京市房山区"))
.filter().add(QueryBuilders.rangeQuery("birthDate").format("yyyy").gte("1990").lte("1995"));
// 构建查询源构建器
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(boolQueryBuilder);
// 创建查询请求对象,将查询对象配置到其中
SearchRequest searchRequest = new SearchRequest("mydlq-user");
searchRequest.source(searchSourceBuilder);
// 执行查询,然后处理响应结果
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 根据状态和数据条数验证是否返回了数据
if (RestStatus.OK.equals(searchResponse.status()) && searchResponse.getHits().totalHits > 0) {
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
// 将 JSON 转换成对象
UserInfo userInfo = JSON.parseObject(hit.getSourceAsString(), UserInfo.class);
// 输出查询信息
log.info(userInfo.toString());
}
}
}catch (IOException e){
log.error("",e);
}
}

}

八、聚合查询操作示例

1、Metric 聚合分析

(1)、Restful 操作示例

统计员工总数、工资最高值、工资最低值、工资平均工资、工资总和:

GET /mydlq-user/_search
{
"size": 0,
"aggs": {
"salary_stats": {
"stats": {
"field": "salary"
}
}
}
}

统计员工工资最低值:

GET /mydlq-user/_search
{
"size": 0,
"aggs": {
"salary_min": {
"min": {
"field": "salary"
}
}
}
}

统计员工工资最高值:

GET /mydlq-user/_search
{
"size": 0,
"aggs": {
"salary_max": {
"max": {
"field": "salary"
}
}
}
}

统计员工工资平均值:

GET /mydlq-user/_search
{
"size": 0,
"aggs": {
"salary_avg": {
"avg": {
"field": "salary"
}
}
}
}

统计员工工资总值:

GET /mydlq-user/_search
{
"size": 0,
"aggs": {
"salary_sum": {
"sum": {
"field": "salary"
}
}
}
}

统计员工总数:

GET /mydlq-user/_search
{
"size": 0,
"aggs": {
"employee_count": {
"value_count": {
"field": "salary"
}
}
}
}

统计员工工资百分位:

GET /mydlq-user/_search
{
"size": 0,
"aggs": {
"salary_percentiles": {
"percentiles": {
"field": "salary"
}
}
}
}

(2)、Java 代码示例

import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.aggregations.AggregationBuilder;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.metrics.avg.ParsedAvg;
import org.elasticsearch.search.aggregations.metrics.max.ParsedMax;
import org.elasticsearch.search.aggregations.metrics.min.ParsedMin;
import org.elasticsearch.search.aggregations.metrics.percentiles.ParsedPercentiles;
import org.elasticsearch.search.aggregations.metrics.percentiles.Percentile;
import org.elasticsearch.search.aggregations.metrics.stats.ParsedStats;
import org.elasticsearch.search.aggregations.metrics.sum.ParsedSum;
import org.elasticsearch.search.aggregations.metrics.sum.SumAggregationBuilder;
import org.elasticsearch.search.aggregations.metrics.valuecount.ParsedValueCount;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;

@Slf4j
@Service
public class AggrMetricService {

@Autowired
private RestHighLevelClient restHighLevelClient;

/**
* stats 统计员工总数、员工工资最高值、员工工资最低值、员工平均工资、员工工资总和
*/
public Object aggregationStats() {
String responseResult = "";
try {
// 设置聚合条件
AggregationBuilder aggr = AggregationBuilders.stats("salary_stats").field("salary");
// 查询源构建器
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.aggregation(aggr);
// 设置查询结果不返回,只返回聚合结果
searchSourceBuilder.size(0);
// 创建查询请求对象,将查询条件配置到其中
SearchRequest request = new SearchRequest("mydlq-user");
request.source(searchSourceBuilder);
// 执行请求
SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
// 获取响应中的聚合信息
Aggregations aggregations = response.getAggregations();
// 输出内容
if (RestStatus.OK.equals(response.status()) || aggregations != null) {
// 转换为 Stats 对象
ParsedStats aggregation = aggregations.get("salary_stats");
log.info("-------------------------------------------");
log.info("聚合信息:");
log.info("count:{}", aggregation.getCount());
log.info("avg:{}", aggregation.getAvg());
log.info("max:{}", aggregation.getMax());
log.info("min:{}", aggregation.getMin());
log.info("sum:{}", aggregation.getSum());
log.info("-------------------------------------------");
}
// 根据具体业务逻辑返回不同结果,这里为了方便直接将返回响应对象Json串
responseResult = response.toString();
} catch (IOException e) {
log.error("", e);
}
return responseResult;
}

/**
* min 统计员工工资最低值
*/
public Object aggregationMin() {
String responseResult = "";
try {
// 设置聚合条件
AggregationBuilder aggr = AggregationBuilders.min("salary_min").field("salary");
// 查询源构建器
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.aggregation(aggr);
searchSourceBuilder.size(0);
// 创建查询请求对象,将查询条件配置到其中
SearchRequest request = new SearchRequest("mydlq-user");
request.source(searchSourceBuilder);
// 执行请求
SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
// 获取响应中的聚合信息
Aggregations aggregations = response.getAggregations();
// 输出内容
if (RestStatus.OK.equals(response.status()) || aggregations != null) {
// 转换为 Min 对象
ParsedMin aggregation = aggregations.get("salary_min");
log.info("-------------------------------------------");
log.info("聚合信息:");
log.info("min:{}", aggregation.getValue());
log.info("-------------------------------------------");
}
// 根据具体业务逻辑返回不同结果,这里为了方便直接将返回响应对象Json串
responseResult = response.toString();
} catch (IOException e) {
log.error("", e);
}
return responseResult;
}

/**
* max 统计员工工资最高值
*/
public Object aggregationMax() {
String responseResult = "";
try {
// 设置聚合条件
AggregationBuilder aggr = AggregationBuilders.max("salary_max").field("salary");
// 查询源构建器
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.aggregation(aggr);
searchSourceBuilder.size(0);
// 创建查询请求对象,将查询条件配置到其中
SearchRequest request = new SearchRequest("mydlq-user");
request.source(searchSourceBuilder);
// 执行请求
SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
// 获取响应中的聚合信息
Aggregations aggregations = response.getAggregations();
// 输出内容
if (RestStatus.OK.equals(response.status()) || aggregations != null) {
// 转换为 Max 对象
ParsedMax aggregation = aggregations.get("salary_max");
log.info("-------------------------------------------");
log.info("聚合信息:");
log.info("max:{}", aggregation.getValue());
log.info("-------------------------------------------");
}
// 根据具体业务逻辑返回不同结果,这里为了方便直接将返回响应对象Json串
responseResult = response.toString();
} catch (IOException