Spark读取HDFS文件，文件格式为GB2312，转换为UTF-8

package iie.udps.example.operator.spark;

import scala.Tuple2;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaPairRDD;
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.Function;
import org.apache.spark.api.java.function.Function2;
import org.apache.spark.api.java.function.PairFunction;

import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.regex.Pattern;

/**
 * 利用Spark框架读取HDFS文件，文件格式为GB2312，转换为UTF-8，实现WordCount示例
 * 
 * 执行命令：spark-submit --class iie.hadoop.hcatalog.TextFileSparkTest --master
 * yarn-cluster /tmp/sparkTest.jar hdfs://192.168.8.101/test/words
 * hdfs://192.168.8.101/test/spark/out
 * 
 *
 */
public final class SparkChangeTextCharsetTest {
	private static final Pattern SPACE = Pattern.compile(",");

	@SuppressWarnings("serial")
	public static void main(String[] args) throws Exception {

		if (args.length < 2) {
			System.err.println("Usage: JavaWordCount <file>");
			System.exit(1);
		}
		String inputSparkFile = args[0];
		String outputSparkFile = args[1];

		SparkConf sparkConf = new SparkConf().setAppName("SparkWordCount");
		JavaSparkContext ctx = new JavaSparkContext(sparkConf);
		Configuration conf = new Configuration();
		JavaPairRDD<LongWritable, Text> contents = ctx.newAPIHadoopFile(
				inputSparkFile, TextInputFormat.class, LongWritable.class,
				Text.class, conf);
		JavaRDD<String> lines = contents
				.map(new Function<Tuple2<LongWritable, Text>, String>() {

					public String call(Tuple2<LongWritable, Text> x) {
						String lines = null;
						try {
							lines = new String(x._2().getBytes(), 0, x._2()
									.getLength(), "GB2312");
						} catch (UnsupportedEncodingException e) {
							e.printStackTrace();
						}
						return lines;
					}
				});
		// JavaRDD<String> changeLines = lines
		// .filter(new Function<String, Boolean>() {
		// public Boolean call(String s) {
		// return s.contains("234");
		// }
		// });
		 JavaRDD<String> words = lines
		 .flatMap(new FlatMapFunction<String, String>() {
		 @Override
		 public Iterable<String> call(String s) {
		 return Arrays.asList(SPACE.split(s));
		 }
		 });
		
		 JavaPairRDD<String, Integer> ones = words
		 .mapToPair(new PairFunction<String, String, Integer>() {
		
		 @Override
		 public Tuple2<String, Integer> call(String s) {
		 return new Tuple2<String, Integer>(s, 1);
		 }
		 });
		
		 JavaPairRDD<String, Integer> counts = ones
		 .reduceByKey(new Function2<Integer, Integer, Integer>() {
		 @Override
		 public Integer call(Integer i1, Integer i2) {
		 return i1 + i2;
		 }
		 });
		
		 counts.map(new Function<Tuple2<String, Integer>, String>() {
		 @Override
		 public String call(Tuple2<String, Integer> arg0) throws Exception {
		 return arg0._1.toUpperCase() + ": " + arg0._2;
		 }
		 }).saveAsTextFile(outputSparkFile);

		ctx.stop();
	}
}