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;
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
