public class WordCountLocal {
public static void main(String[] args) {
SparkConf conf = new SparkConf().setAppName("WordCountLocal").setMaster("local[2]");
JavaSparkContext sc = new JavaSparkContext(conf);
JavaRDD<String> words = sc.textFile("c:.//words.txt").flatMap(new FlatMapFunction<String, String>() {
@Override
public Iterable<String> call(String line) throws Exception {
return Arrays.asList(line.split(" "));
}
});
JavaPairRDD<String, Integer> mapToPair = words.mapToPair(new PairFunction<String, String, Integer>() {
@Override
public Tuple2<String, Integer> call(String word) throws Exception {
return new Tuple2<String, Integer>(word,1);
}
});
JavaPairRDD<String, Integer> result = mapToPair.reduceByKey(new Function2<Integer, Integer, Integer>() {
@Override
public Integer call(Integer v1, Integer v2) throws Exception {
return v1 + v2;
}
});
result.foreach(new VoidFunction<Tuple2<String,Integer>>() {
@Override
public void call(Tuple2<String, Integer> wordCount) throws Exception {
System.out.println(wordCount._1 + " appear " + wordCount._2 + " times!");
}
});
sc.close();
}
}
本文转自 ChinaUnicom110 51CTO博客，原文链接:http://blog.51cto.com/xingyue2011/1933462
