hive的udf的编写

package com.qunar.hiveudf;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import org.apache.hadoop.hive.ql.exec.UDF;

public class IsSundayOrSaturday extends UDF
{
	public Boolean evaluate(String dateString)
	{
		try 
		{
			//将string转化为date
			String str = dateString.split(" ")[0];
			SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
			Date date =sdf.parse(str);
			
			//将date转换为calendar
			Calendar calendar = Calendar.getInstance();
			calendar.setTime(date);
			
			//获取date的星期
			int week = calendar.get(Calendar.DAY_OF_WEEK)-1;
			if(week == 0 || week == 6)
			{
				return true;
			}
			else 
			{
				return false;
			}	
		} 
		catch (Exception e) 
		{
			// TODO: handle exception
			return false;
		}
	}
}

3.将jar包引入hadoop环境