Operator_flatMap

package com.bjsxt.spark.transformations;
import java.util.Arrays;

import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.FlatMapFunction;
import org.apache.spark.api.java.function.VoidFunction;


/**
 * flatMap
 * 输入一条数据，输出0到多条数据。
 * @author root
 *
 */
public class Operator_flatMap {
public static void main(String[] args) {
SparkConf conf = new SparkConf();
conf.setMaster("local");
conf.setAppName("flatMap");


JavaSparkContext jsc = new JavaSparkContext(conf);
JavaRDD<String> lines = jsc.textFile("./words.txt");
JavaRDD<String> flatMapResult = lines.flatMap(new FlatMapFunction<String, String>() {
private static final long serialVersionUID = 1L;


@Override
public Iterable<String> call(String s) throws Exception {

return Arrays.asList(s.split(" "));
}

});
flatMapResult.foreach(new VoidFunction<String>() {


private static final long serialVersionUID = 1L;


@Override
public void call(String t) throws Exception {
System.out.println(t);
}
});

jsc.stop();
}
}