如何在集群模式下启动JavaSparkContext客户端？

import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaSparkContext;

SparkConf conf = new SparkConf()
    .setAppName("YourAppName")
    .setMaster("spark://<master-ip>:<master-port>");

JavaSparkContext sc = new JavaSparkContext(conf);

import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaSparkContext;

public class SparkApp {
    public static void main(String[] args) {
        SparkConf conf = new SparkConf()
            .setAppName("YourAppName")
            .setMaster("spark://<master-ip>:<master-port>");
        
        JavaSparkContext sc = new JavaSparkContext(conf);
        
        // 执行Spark操作
        // ...
        
        sc.stop();
    }
}