数据：
Soretest 文件夹中创建一个 file.txt，存入一下格式的内容：
Jane Math 90
Jane English 94
Selina Math 98
Selina Chinese 100
Selina English 99
Smith Math 90
Kangkang Math 96
Smith English 99
源码：
package org.apache.hadoop.examples;
import java.io.IOException;
import java.util.Iterator;
import java.util.StringTokenizer;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
public class WordCount {
public WordCount() {
}
public static void main(String[] args) throws Exception {
Configuration conf = new Configuration();
//String[] otherArgs = (new GenericOptionsParser(conf, args)).getRemainingArgs();
String[] otherArgs=new String[]{"soretest","scoreout"};
if(otherArgs.length < 2) {
System.err.println("Usage: wordcount <in> [<in>...] <out>");
System.exit(2);
}
Job job = Job.getInstance(conf, "word count"); //taskname
job.setJarByClass(WordCount.class);
job.setMapperClass(WordCount.TokenizerMapper.class);
