基于Springboot2.0如何构建ES多客户端

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有时候我们操作es的时候会有一些特殊的需求，例如需要操作的index使用了不同的es服务器、用户名、密码、参数等，这个时候我们需要使用不同的es的客户端进行操作，但是我们又不希望拆分成多个项目进行使用，这个时候我们就需要在我们的配置中自己构建一套ES的多客户端了。

文章目录

pom.xml
ElasticsearchConfig.java
ElasticsearchRestClient.java
最终

pom.xml

首先是我们的pom.xml：

<dependencies>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter</artifactId>
   <version>2.0.5.RELEASE</version>
  </dependency>
  
  <!--es for transport-->
  <dependency>
   <groupId>org.elasticsearch</groupId>
   <artifactId>elasticsearch</artifactId>
   <version>5.6.11</version>
  </dependency>

  <dependency>
   <groupId>org.elasticsearch.client</groupId>
   <artifactId>elasticsearch-rest-client</artifactId>
   <version>5.6.11</version>
  </dependency>

  <!--es sniffer-->
  <dependency>
   <groupId>org.elasticsearch.client</groupId>
   <artifactId>elasticsearch-rest-client-sniffer</artifactId>
   <version>5.6.3</version>
   <scope>compile</scope>
  </dependency>

  <!--es for rest-high-level-client-->
  <dependency>
   <groupId>org.elasticsearch.client</groupId>
   <artifactId>elasticsearch-rest-high-level-client</artifactId>
   <version>5.6.11</version>
  </dependency>

  <dependency>
   <groupId>org.apache.commons</groupId>
   <artifactId>commons-lang3</artifactId>
   <version>3.4</version>
  </dependency>

  <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
   <version>1.2.39</version>
  </dependency>

  <dependency>
   <groupId>org.apache.logging.log4j</groupId>
   <artifactId>log4j-core</artifactId>
   <version>2.9.1</version>
  </dependency>

  <!-- SpringBoot 热启动 -->
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-devtools</artifactId>
  </dependency>

  <dependency>
   <groupId>org.apache.commons</groupId>
   <artifactId>commons-pool2</artifactId>
   <version>2.4.2</version>
  </dependency>

  <dependency>
   <groupId>org.elasticsearch.client</groupId>
   <artifactId>elasticsearch-rest-client-sniffer</artifactId>
   <version>5.6.0</version>
  </dependency>

  <dependency>
   <groupId>commons-io</groupId>
   <artifactId>commons-io</artifactId>
   <version>2.6</version>
  </dependency>
</dependencies>

ElasticsearchConfig.java

然后是我们的配置文件，我这里使用的是application.properties的配置文件，因为我们使用不同的信息，所以这里我就不写了，可以根据需求自行获取。

ElasticsearchRestClient.java

import cnkj.site.config.ElasticsearchConfig;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.sniff.SniffOnFailureListener;
import org.elasticsearch.client.sniff.Sniffer;
import org.elasticsearch.client.sniff.SnifferBuilder;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/*
 * @version 1.0 created by LXW on 2018/11/22 9:43
 */
@Slf4j
@Configuration
public class ElasticsearchClient {

 @Bean(name = "HighESClient")
 public RestClient restTomcatClient(ElasticsearchConfig elasticsearchConfig) {
  final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
  credentialsProvider.setCredentials(AuthScope.ANY,
    //es账号密码
    new UsernamePasswordCredentials(elasticsearchConfig.getUsername(), elasticsearchConfig.getPassword()));
  //自动扫描网段
  //监听同网段服务
  //Low Level Client init
  RestClientBuilder builder = RestClient.builder(
    new HttpHost(
      elasticsearchConfig.getHost(),
      Integer.valueOf(elasticsearchConfig.getPort()),
      elasticsearchConfig.getSchema()
    )
  ).setHttpClientConfigCallback(
    httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider)
  ).setRequestConfigCallback(new RestClientBuilder.RequestConfigCallback() {
     @Override
     public RequestConfig.Builder customizeRequestConfig(RequestConfig.Builder builder) {
      builder.setConnectTimeout(elasticsearchConfig.getConnectTimeout());
      builder.setSocketTimeout(elasticsearchConfig.getSocketTimeout());
      return builder;
     }
    })
    .setMaxRetryTimeoutMillis(elasticsearchConfig.getMaxRetryTimeoutMillis());
  builder.setMaxRetryTimeoutMillis(elasticsearchConfig.getMaxRetryTimeoutMillis());
  SniffOnFailureListener sniffOnFailureListener = new SniffOnFailureListener();
  builder.setFailureListener(sniffOnFailureListener);
  RestClient lowLevelRestClient = builder.build();
  SnifferBuilder snifferBuilder = Sniffer.builder(lowLevelRestClient).setSniffIntervalMillis(elasticsearchConfig.getSnifferinterval());
  if (elasticsearchConfig.getFailuredelay() > 0) {
   snifferBuilder.setSniffAfterFailureDelayMillis(elasticsearchConfig.getFailuredelay());
  }
  sniffOnFailureListener.setSniffer(snifferBuilder.build());
  return lowLevelRestClient;
 }
 @Bean(name = "HighLevelESClient")
 public RestHighLevelClient restHighLevelClient(@Qualifier("HighESClient") RestClient restClient) {
  return new RestHighLevelClient(restClient);
 }

}

最终

在需要使用的地方直接通过注入的方式使用不同的客户端

@Resource(name = "HighLevelESClient")
private RestHighLevelClient client;

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