在Java Spark应用程序中获取EMR集群ID

，可以通过使用AWS SDK for Java来实现。以下是一个示例代码：

import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.elasticmapreduce.AmazonElasticMapReduce;
import com.amazonaws.services.elasticmapreduce.AmazonElasticMapReduceClientBuilder;
import com.amazonaws.services.elasticmapreduce.model.DescribeClusterRequest;
import com.amazonaws.services.elasticmapreduce.model.DescribeClusterResult;

public class EMRClusterID {
    public static void main(String[] args) {
        String clusterId = getEMRClusterID();
        System.out.println("EMR Cluster ID: " + clusterId);
    }

    public static String getEMRClusterID() {
        AmazonElasticMapReduce emrClient = AmazonElasticMapReduceClientBuilder.standard()
                .withCredentials(DefaultAWSCredentialsProviderChain.getInstance())
                .withRegion(Regions.US_EAST_1)
                .build();

        DescribeClusterRequest describeClusterRequest = new DescribeClusterRequest()
                .withClusterId("YOUR_CLUSTER_ID");

        DescribeClusterResult describeClusterResult = emrClient.describeCluster(describeClusterRequest);

        return describeClusterResult.getCluster().getId();
    }
}

请注意，上述代码中的"YOUR_CLUSTER_ID"需要替换为您实际的EMR集群ID。此代码使用AWS SDK for Java创建一个EMR客户端，并使用describeCluster方法获取集群的详细信息，然后从结果中提取集群ID并返回。

这是一个使用Java Spark应用程序获取EMR集群ID的示例。您可以根据自己的需求进行修改和扩展。