```java
package com.gosuncn;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;
import java.io.IOException;
public class WordCountMapper extends Mapper<LongWritable, Text, Text, IntWritable> {
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
/**
* 使用逗号分隔
*/
String[] words = value.toString().split(",");
/**
* 将KV写出
*/
for (String word : words) {
context.write(new Text(word), new IntWritable(1));
}
}
}
```
