HADOOP-输出数据实体类承载

新建一个bean包：

　　1.实现Writerable

　　2.有一个空的构造方法

代码实现：

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

import org.apache.hadoop.io.Writable;
//实现 hadoop中 的 Writable 接口
public class Phone implements Writable{
    private int up;
    private int down;
    public Phone(int up, int down) {
        this.up = up;
        this.down = down;
    }
    public Phone() { //保留空构造器
    }
    
    @Override//自定义 格式 tostring
    public String toString() {
        return up + "	" + down + "	"+(up+down);
    }
    public int getUp() {
        return up;
    }
    public void setUp(int up) {
        this.up = up;
    }
    public int getDown() {
        return down;
    }
    public void setDown(int down) {
        this.down = down;
    }
    @Override  //重写 两个方法， 按顺序 写和读。
    public void readFields(DataInput input) throws IOException {
        this.up=input.readInt();
        this.down= input.readInt();
    }
    @Override
    public void write(DataOutput output) throws IOException {
        output.writeInt(up);
        output.writeInt(down);
    }    
}