在Java中使用RestClientBuilder连接到Elasticsearch集群并进行鉴权,可以通过设置HttpHosts、RequestConfig以及添加相应的Header来实现。
以下是一个示例代码:
import org.apache.http.Header;
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.impl.client.BasicCredentialsProvider;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import java.util.Collections;
public class ElasticsearchRestClient {
public static void main(String[] args) throws Exception {
final String elasticsearchUsername = "elastic";
final String elasticsearchPassword = "changeme";
final String elasticsearchHosts = "http://localhost:9200";
// 创建CredentialsProvider
CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY,
new UsernamePasswordCredentials(elasticsearchUsername, elasticsearchPassword));
// 创建RestClientBuilder
RestClientBuilder builder = RestClient.builder(new HttpHost(elasticsearchHosts, 9200, "http"))
.setHttpClientConfigCallback(httpClientBuilder ->
httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
// 创建高级RestClient
RestHighLevelClient client = new RestHighLevelClient(builder);
// 使用client进行操作...
// 关闭client
client.close();
}
}
在这个示例中,我们首先创建了一个CredentialsProvider实例,并通过它添加了基本的身份验证信息。然后,我们使用RestClientBuilder并通过其setHttpClientConfigCallback方法设置了默认的CredentialsProvider。最后,我们创建了一个RestHighLevelClient实例,用于执行Elasticsearch相关操作。
请注意,这里的Elasticsearch集群地址、用户名和密码都是示例,您需要根据实际情况进行替换。