WordMap.java
package MyMap;
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 WordMap extends Mapper<LongWritable,Text,Text,IntWritable> {
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
System.out.println("bbbbbbbbbbbbbbbbbbbbbbbb====>"+value.toString());
String line = value.toString();
String[] words = line.split(" ");
for(String word : words) {
context.write(new Text(word), new IntWritable(1));
}
}
}
WordReduce.java
package MyReduce;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;
import java.io.IOException;
public class WordReduce extends Reducer<Text, IntWritable,Text,IntWritable> {
@Override
protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
Integer count = 0;
for(IntWritable value : values) {
count += value.get();
}
context.write(key,new IntWritable(count));
}
}
WordMain.java
package MyMain;
import MyMap.WordMap;
import MyReduce.WordReduce;
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.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import java.io.IOException;
public class WordMain {
public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
//创建配置对象
Configuration configuration = new Configuration();
//创建job对象
Job job = Job.getInstance(configuration,"mineWordCount");
System.out.println("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
//设置运行job类
job.setJarByClass(WordMain.class);
//设置mapper类
job.setMapperClass(WordMap.class);
//设置reduce类
job.setReducerClass(WordReduce.class);
//设置map输出的key value
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(IntWritable.class);
//设置reduce输出的key value
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
//设置输入输出路径
FileInputFormat.setInputPaths(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
//提交job
boolean b = job.waitForCompletion(true);
if(b) {
System.out.println("----------->success");
} else {
System.out.println("----------->error");
}
}
}