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。