作者:一一哥
ElasticSearch是一个基于Lucene的开源的、分布式实时搜索和分析引擎。它提供了一个分布式多用户能力的全文搜索引擎,基于RESTful web接口。Elasticsearch是用Java开发的,并作为Apache许可条款下的开放源码发布,是当前流行的企业级搜索引擎。
Spring Boot为Elasticsearch提供基本的自动配置,我们可以利用Spring Data Elasticsearch在Spring Boot中进行开发。
在利用Elastic Search开发之前,请先搭建好Elastic Search环境,我这里配置了ELK环境。关于ELK环境的搭建,感兴趣的朋友可以自行搜索。
在新版本的Spring boot2.x中,spring-boot-starter-data-elasticsearch支持的Elasticsearch版本是2.X,但Elasticsearch实际上已经发展到6.5.X版本了,为了更好的使用Elasticsearch的新特性,我们可以弃用spring-boot-starter-data-elasticsearch依赖,改为直接使用Spring-data-elasticsearch,以便启用对新版本支持,目前的版本对应关系如下:

我们按照之前的经验,创建一个web程序,并将之改造成Spring Boot项目,具体过程略。

org.springframework.boot
spring-boot-starter-data-elasticsearch
注意:因为我的elastic search 并不是6.5.x以上的最新版本,而是5.6.8版本,所以我这里使用的还是spring-boot-starter-data-elasticsearch的依赖包。
# Elasticsearch
# 9200作为Http协议,主要用于外部通讯,而9300作为Tcp协议,是传输层监听的默认端口,jar之间就是通过tcp协议通讯
elasticsearch:
#注意cluster.name需要与config/elasticsearch.yml中的cluster.name一致
# Elasticsearch cluster name.
cluster:
name: elasticsearch
# Comma-separated list of cluster node addresses.
ip: localhost
port: 9300
pool: 5
elastic search默认的端口号是9300。
package com.yyg.boot.config;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import java.net.InetAddress;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/13
* @Description Description
*/
@Slf4j
@Configuration
public class ElasticSearchConfig {
@Value("${elasticsearch.ip}")
private String hostName;
@Value("${elasticsearch.port}")
private String port;
@Value("${elasticsearch.cluster.name}")
private String clusterName;
@Value("${elasticsearch.pool}")
private String poolSize;
/**
* 构建TransportClient对象
*/
@Bean(name = "transportClient")
public TransportClient transportClient() {
log.info("Elasticsearch初始化开始。。。。。");
TransportClient transportClient = null;
try {
// 配置信息
Settings esSetting = Settings.builder()
//集群名字
.put("cluster.name", clusterName)
//增加嗅探机制,找到ES集群
.put("client.transport.sniff", true)
//增加线程池个数,暂时设为5
.put("thread_pool.search.size", Integer.parseInt(poolSize))
.build();
//配置信息Settings自定义
transportClient = new PreBuiltTransportClient(esSetting);
TransportAddress transportAddress = new TransportAddress(InetAddress.getByName(hostName), Integer.valueOf(port));
transportClient.addTransportAddresses(transportAddress);
} catch (Exception e) {
log.error("elasticsearch TransportClient create error!!", e);
}
return transportClient;
}
/**
* 构建ElasticsearchTemplate对象
*/
@Bean
public ElasticsearchOperations elasticsearchTemplate() {
Client client = transportClient();
if (client != null) {
return new ElasticsearchTemplate(client);
} else {
//弹出异常对象
throw new RuntimeException("初始化Elasticsearch失败!");
}
}
}
我这里直接使用TransportClient进行增删改查,后面的章节中,我会讲解简化方案。
package com.yyg.boot.web;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/13
* @Description Description
*/
@RestController
@RequestMapping("/book")
public class BookController {
@Autowired
private TransportClient transportClient;
/**
* 添加博客索引信息
*/
@PostMapping("/add")
public ResponseEntity add(
@RequestParam(name = "title") String title,
@RequestParam(name = "author") String author,
@RequestParam(name = "word_count") int wordCount,
@RequestParam(name = "publish_date") @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date publishDate
) {
try {
XContentBuilder content = XContentFactory.jsonBuilder()
.startObject()
.field("title", title)
.field("author", author)
.field("word_count", wordCount)
.field("publish_date", publishDate.getTime())
.endObject();
IndexResponse result = this.transportClient.prepareIndex("blogs", "blog").setSource(content).get();
return new ResponseEntity(result.getId(), HttpStatus.OK);
} catch (Exception e) {
e.printStackTrace();
;
return new ResponseEntity(HttpStatus.INTERNAL_SERVER_ERROR);
}
}
/**
* 根据id查询
*/
@GetMapping("/get")
public ResponseEntity get(@RequestParam(name = "id", defaultValue = "") String id) {
if (id.isEmpty()) {
return new ResponseEntity((HttpStatus.NOT_FOUND));
}
GetResponse result = transportClient.prepareGet("blogs", "blog", id).get();
if (!result.isExists()) {
return new ResponseEntity((HttpStatus.NOT_FOUND));
}
return new ResponseEntity(result.getSource(), HttpStatus.OK);
}
/**
* 按条件查询
*/
@GetMapping("/query")
public ResponseEntity query(
@RequestParam(name = "author", required = false) String author,
@RequestParam(name = "title", required = false) String title,
@RequestParam(name = "gt_word_count", defaultValue = "0") int gtWordCount,
@RequestParam(name = "lt_word_count", required = false) Integer ltWordCount
) {
//设置查询条件
BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
if (author != null) {
boolQuery.must(QueryBuilders.matchQuery("author", author));
}
if (title != null) {
boolQuery.must(QueryBuilders.matchQuery("title", title));
}
//按范围查询
RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("word_count").from(gtWordCount);
if (ltWordCount != null && ltWordCount > 0) {
rangeQuery.to(ltWordCount);
}
boolQuery.filter(rangeQuery);
SearchRequestBuilder builder = this.transportClient.prepareSearch("blogs")
.setTypes("blog")
.setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
.setQuery(boolQuery)
//设置分页查询
.setFrom(0)
.setSize(10);
System.out.println(builder);
SearchResponse response = builder.get();
List
package com.yyg.boot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/9
* @Description Description
*/
@SpringBootApplication
public class ElasticApplication {
public static void main(String[] args) {
SpringApplication.run(ElasticApplication.class, args);
}
}
kibana正常启动后效果

在kibana中进行索引的查看
在我们前面的代码中,我们已经创建了index索引为blogs,所以我们可以在kibana中把这个blogs索引同步过来。

到这一步,我们就把代码中创建好的blogs索引同步过来了,接下来我们可以查看blogs索引中的内容。