Elesticsearch使用总结

写在前面

ElasticSearch是一个基于Lucene的搜索服务器。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。设计用于[云计算]中，能够达到实时搜索，稳定，可靠，快速，安装使用方便。

可以这样来对比elasticsearch和数据库
索引（indices） ~~~~~~~~ 数据库（databases)
类型（type) ~~~~~~~~ 数据表（table)
文档（Document）~~~~~~~~ 行(row)
字段（Field） ~~~~~~~~ 列(Columns )

shards：分片数量，默认5
replicas：副本数量，默认1

引入库

implementation group: 'org.springframework.boot', name: 'spring-boot-starter-data-elasticsearch', version: '2.7.5'
implementation group: 'org.springframework.data', name: 'spring-data-elasticsearch', version: '4.4.13';

版本对应要求见如下表格: 传送门

Spring Data Release Train	Spring Data Elasticsearch	Elasticsearch	Spring Framework	Spring Boot
2023.0 (Ullmann)	5.1.x	8.7.1	6.0.x	3.1.x
2022.0 (Turing)	5.0.x	8.5.3	6.0.x	3.0.x
2021.2 (Raj)	4.4.x[1]	7.17.3	5.3.x	2.7.x
2021.1 (Q)	4.3.x[1]	7.15.2	5.3.x	2.6.x
2021.0 (Pascal)	4.2.x[1]	7.12.0	5.3.x	2.5.x
2020.0 (Ockham)	4.1.x[1]	7.9.3	5.3.2	2.4.x
Neumann	4.0.x[1]	7.6.2	5.2.12	2.3.x
Moore	3.2.x[1]	6.8.12	5.2.12	2.2.x
Lovelace	3.1.x[1]	6.2.2	5.1.19	2.1.x
Kay	3.0.x[1]	5.5.0	5.0.13	2.0.x
Ingalls	2.1.x[1]	2.4.0	4.3.25	1.5.x

配置连接

spring:elasticsearch:rest:uris: 10.10.88.163:9200username: rootpassword: pass123

配置信息读取：

@RefreshScope
@ConfigurationProperties(ESProperties.PREFIX)
public class ESProperties {public static final String PREFIX = "spring.elasticsearch.rest";private Boolean enable = true;private String uris;private String userName;/*** Secret key是你账户的密码*/private String password;}

连接初始化：

@AutoConfiguration
@EnableConfigurationProperties(ESProperties.class)
@ConditionalOnProperty(value = ESProperties.PREFIX + ".enabled", havingValue = "true", matchIfMissing = true)
public class ElasticSearchConfig extends AbstractElasticsearchConfiguration {private static final Logger logger = LogManager.getLogger(ElasticSearchConfig.class);@Resourceprivate ESProperties esProperties;@Override@Bean(destroyMethod = "close")public RestHighLevelClient elasticsearchClient() {final ClientConfiguration clientConfiguration = ClientConfiguration.builder().connectedTo(esProperties.getUris()).withBasicAuth(esProperties.getUserName(), esProperties.getPassword()).withConnectTimeout(RestClientBuilder.DEFAULT_CONNECT_TIMEOUT_MILLIS).withSocketTimeout(RestClientBuilder.DEFAULT_SOCKET_TIMEOUT_MILLIS).build();RestHighLevelClient client = RestClients.create(clientConfiguration).rest();try {logger.info("connect to elasticsearch:{} ", client.getLowLevelClient().getNodes());MainResponse response = client.info(RequestOptions.DEFAULT);MainResponse.Version version = response.getVersion();logger.info("elasticsearch version:{},lucene version:{}", version.getNumber(), version.getLuceneVersion());} catch (Exception e) {throw new RuntimeException(e);}return client;}
}

文件配置 spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=io.gamioo.core.elasticsearch.config.ElasticSearchConfig

DAO层：

public interface OperationLogRepository extends ElasticsearchRepository<OperationLog, String> {}

操作对象：

@ApiModel(value = "operation_log", description = "操作日志")
@Document(indexName = "operation_log_*")
public class OperationLog {@Idprivate String id;@ApiModelProperty("创建时间")@Field(name = "addTime", type = FieldType.Date, format = DateFormat.custom, pattern = "yyyy-MM-dd'T'HH:mm:ssz")private Date addTime;}

逻辑操作：

    @Resourceprivate OperationLogRepository repository;@Overridepublic Page<OperationLog> findAll(Pageable pageable) {return repository.findAll(pageable);}@Overridepublic Page<OperationLog> findByAddTimeBetween(LocalDateTime startTime, LocalDateTime endTime, Pageable pageable) {return repository.findByAddTimeBetween(startTime, endTime, pageable);}

Q&A

1.实际使用中一直报错： missing authentication credentials for REST request
经过多方查证，最后发现报错原因是：配置ES时没添加用户名密码验证

总结

以上就是springboot集成es后的一个简单使用，spring封装过后的spring-boot-starter-data-elasticsearch使用起来还是非常方便简单的。