MapReduce案例-自定义数据类型

统计第一季度用户的手机上网流量，通话时间，短信数量。

数据格式：

电话 流量 时间 短信数

 

这里自定义了一个类实现writable接口，用来读取数据。

package demo;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
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;
/**
 * 统计第一季度用户的手机上网流量，通话时间，短信数量
 * @author youxiangyang
 *
 */
public class PhoneCount {
    public static void main(String[] args) throws ClassNotFoundException, IOException, InterruptedException {
        if (args.length!=2) {
            System.err.println("user path err!");
            System.exit(-1);
        }
        @SuppressWarnings("deprecation")
        Job job=new Job(new Configuration(), "jobName");
        job.setJarByClass(PhoneCount.class);
        FileInputFormat.addInputPath(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));
        job.setMapperClass(phmap.class);
        job.setReducerClass(phreduce.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(PhoneNum.class);
        job.waitForCompletion(true);
    }
    public static class phmap extends Mapper<Object, Text, Text,PhoneNum>{
        @Override
        protected void map(Object key, Text value, Mapper<Object, Text, Text, PhoneNum>.Context context)
                throws IOException, InterruptedException {
            String[] lines = value.toString().split("\t");
            String pnum=lines[0];
            int gprs=Integer.parseInt(lines[1].trim());
            int phtime=Integer.parseInt(lines[2]);
            int phmail=Integer.parseInt(lines[3]);
            PhoneNum phoneNum = new PhoneNum(gprs,phtime,phmail);
            context.write(new Text(pnum), phoneNum);
        }
    }
    public static class phreduce extends Reducer<Text, PhoneNum,Text,PhoneNum>{
        @Override
        protected void reduce(Text key, Iterable<PhoneNum> value, Reducer<Text, PhoneNum, Text, PhoneNum>.Context context)
                throws IOException, InterruptedException {
            int gsum=0;
            int pt=0;
            int pm=0;
            for (PhoneNum phoneNum : value) {
                gsum+=phoneNum.getInternate();
                pt+=phoneNum.getCalltime();
                pm+=phoneNum.getMailcount();
            }
            PhoneNum phoneNum2 = new PhoneNum(gsum,pt,pm);
            context.write(key, phoneNum2);
            
        }
    }

}

package demo;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import org.apache.hadoop.io.Writable;
/**
 * 创建一个自定义的类实现writable接口
 * @author youxiangyang
 *
 */
public class PhoneNum implements Writable{
    private int internate;
    private int calltime;
    private int mailcount;
    //添加一个无参的构造函数
    public PhoneNum() {
        // TODO Auto-generated constructor stub
    }
    

    public PhoneNum(int internate, int calltime, int mailcount) {
        super();
        this.internate = internate;
        this.calltime = calltime;
        this.mailcount = mailcount;
    }

    //get和setter
    public int getInternate() {
        return internate;
    }


    public void setInternate(int internate) {
        this.internate = internate;
    }


    public int getCalltime() {
        return calltime;
    }


    public void setCalltime(int calltime) {
        this.calltime = calltime;
    }


    public int getMailcount() {
        return mailcount;
    }


    public void setMailcount(int mailcount) {
        this.mailcount = mailcount;
    }
    


    @Override
    public void readFields(DataInput input) throws IOException {
        // TODO Auto-generated method stub
        this.internate=input.readInt();
        this.calltime=input.readInt();
        this.mailcount=input.readInt();
        
    }

    @Override
    public void write(DataOutput output) throws IOException {
        // TODO Auto-generated meouhod stub
        output.writeInt(internate);
        output.writeInt(calltime);
        output.writeInt(mailcount);
        
    }
    
    @Override
    public String toString() {
        return internate + "\t" + calltime + "\t" + mailcount;
    }
    

}