JodaTime初体验

前段时间用JDK自带的Calendar类来处理日期，需要获取年、季，月，星期的起始日期，被折腾得要死要活。看了这篇文章 http://www.blogbus.com/dreamhead-logs/226738702.html 后，决定使用JodaTime重新写一下这个功能。

关于JodaTime可以看这篇文章：http://www.ibm.com/developerworks/cn/java/j-jodatime.html

废话不多说，直接贴代码。

import java.util.Date;

import org.joda.time.DateTime;

public class JodaDemo {
    public static final int PERIOD_TYPE_YEAR = 0;

    public static final int PERIOD_TYPE_MONTH = 1;

    public static final int PERIOD_TYPE_HALFMONTH = 2;

    public static final int PERIOD_TYPE_WEEK = 3;

    public static final int PERIOD_TYPE_BIWEEK = 4;

    public static final int PERIOD_TYPE_QUARTER = 5;

    /**
     * 根据type获取日期期间 type为月的话 则返回月初与月末两个Date
     * 
     * @param currentDate
     * @param type
     * @return
     */
    public static Date[] getPeriodByType(Date currentDate, int type) {

        DateTime date = new DateTime(currentDate);
        Date fromDate = currentDate;
        Date toDate = currentDate;

        switch (type) {
        case PERIOD_TYPE_YEAR:
            fromDate = date.dayOfYear().withMinimumValue().toDate();
            toDate = date.dayOfYear().withMaximumValue().toDate();
            break;

        case PERIOD_TYPE_QUARTER:
            int month = date.getMonthOfYear();
            month = (month - 1) % 3;
            date = date.plusMonths(-month);
            fromDate = date.dayOfMonth().withMinimumValue().toDate();
            date = date.plusMonths(2);
            toDate = date.dayOfMonth().withMaximumValue().toDate();
            break;

        case PERIOD_TYPE_MONTH:
            fromDate = date.dayOfMonth().withMinimumValue().toDate();
            toDate = date.dayOfMonth().withMaximumValue().toDate();
            break;

        case PERIOD_TYPE_WEEK:
            fromDate = date.dayOfWeek().withMinimumValue().toDate();
            toDate = date.dayOfWeek().withMaximumValue().toDate();

            break;

        case PERIOD_TYPE_BIWEEK:
            fromDate = date.dayOfYear().withMinimumValue().toDate();
            toDate = date.dayOfYear().withMaximumValue().toDate();
            break;

        case PERIOD_TYPE_HALFMONTH:

            fromDate = date.dayOfYear().withMinimumValue().toDate();
            toDate = date.dayOfYear().withMaximumValue().toDate();

            break;

        default:
            break;
        }

        Date[] period = new Date[2];
        period[0] = fromDate;
        period[1] = toDate;
        return period;
    }
}

然后写测试：

import static org.junit.Assert.*;

import java.util.Date;

import org.joda.time.DateTime;
import org.junit.Test;


public class JodaDemoTest {
    public static String dateFormat = "yyyy-MM-dd";
    @Test
    public void testGetPeriodByType() {
        DateTime dateTime = new DateTime("2013-12-26");
        Date[] weeks = JodaDemo.getPeriodByType(dateTime.toDate(), JodaDemo.PERIOD_TYPE_WEEK);
        assertEquals("2013-12-23", new DateTime(weeks[0]).toString(dateFormat));
        assertEquals("2013-12-29", new DateTime(weeks[1]).toString(dateFormat));
        
//        Date[] biWeek = JodaDemo.getPeriodByType(dateTime.toDate(), JodaDemo.PERIOD_TYPE_BIWEEK);
//        assertEquals("2013-12-01", new DateTime(biWeek[0]).toString(dateFormat));
//        assertEquals("2013-12-31", new DateTime(biWeek[1]).toString(dateFormat));
        
        Date[] months = JodaDemo.getPeriodByType(dateTime.toDate(), JodaDemo.PERIOD_TYPE_MONTH);
        assertEquals("2013-12-01", new DateTime(months[0]).toString(dateFormat));
        assertEquals("2013-12-31", new DateTime(months[1]).toString(dateFormat));
        
        Date[] quarters = JodaDemo.getPeriodByType(dateTime.toDate(), JodaDemo.PERIOD_TYPE_QUARTER);
        assertEquals("2013-10-01", new DateTime(quarters[0]).toString(dateFormat));
        assertEquals("2013-12-31", new DateTime(quarters[1]).toString(dateFormat));
        
        Date[] years = JodaDemo.getPeriodByType(dateTime.toDate(), JodaDemo.PERIOD_TYPE_YEAR);
        assertEquals("2013-01-01", new DateTime(years[0]).toString(dateFormat));
        assertEquals("2013-12-31", new DateTime(years[1]).toString(dateFormat));
    }

}

测试通过：

 

注：按两周BIWEEK分割和按半个月HALFMONTH分割的功能还没完善。

使用Joda果然简单了很多，接下来有空可以看看源码，再深入理解一下。