Joda Time使用笔记

Joda Time的介绍可以参考这篇文章:
http://www.ibm.com/developerworks/cn/java/j-jodatime.html

工作中也常常用到Joda Time,为了避免每次使用都查API,记录一下常用的用法:
   
   /**
     * DateTime变化(增减)
     */
    @Test
    public void testChange() {
        DateTime dateTime = new DateTime(2014, 1, 2, 10, 11, 12);
        
        //得到1年2个月3天后的日期
        assertEquals(new DateTime(2015, 3, 5, 10, 11, 12), dateTime.plusYears(1).plusMonths(2).plusDays(3));
    }

    /**
     * 指定值(更改DateTime的特定部分为特定值)
     */
    @Test
    public void testSpecific() {
        DateTime dateTime = new DateTime(2014, 12, 2, 8, 12, 45, 666);

        //把小时指定为13点
        assertEquals(new DateTime(2014, 12, 2, 13, 12, 45, 666), dateTime.withHourOfDay(13));
    }
    
    
    /**
     * 字符串和DateTime互转
     */
    @Test
    public void testToDateToString() {
        String str = "2014-12-02 08:12:45";
        DateTime dateTime = new DateTime(2014, 12, 2, 8, 12, 45);

        //字符串转化为DateTime
        DateTime parsedDateTime = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss").parseDateTime(str);
        assertEquals(dateTime, parsedDateTime);

        //DateTime转化为字符串,有两种方法
        String str01 = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss").print(dateTime);
        assertEquals(str, str01);

        String str02 = dateTime.toString("yyyy-MM-dd HH:mm:ss");
        assertEquals(str, str02);

    }

    /**
     * DateTime截断
     */
    @Test
    public void testTruncateTo() {
        DateTime dateTime = new DateTime(2014, 12, 2, 8, 12, 45, 666);

        //精确到天
        DateTime tillDay = dateTime.dayOfMonth().roundFloorCopy();
        assertEquals(new DateTime(2014, 12, 2, 0, 0, 0), tillDay);

        //精确到秒
        DateTime tillSecond = dateTime.secondOfMinute().roundFloorCopy();
        assertEquals(new DateTime(2014, 12, 2, 8, 12, 45), tillSecond);

    }
    
    /**
     * 得到某一天的23:59:59
     */
    @Test
    public void testWith() {
        DateTime dateTime = new DateTime(2014, 12, 2, 8, 12, 45);
        
        //两种方法
        
        //指定时分秒为23:59:59
        assertEquals(new DateTime(2014, 12, 2, 23, 59, 59), dateTime.withHourOfDay(23).withMinuteOfHour(59).withSecondOfMinute(59));
        
        //取一天中的最后一秒(秒的最大值)
        assertEquals(new DateTime(2014, 12, 2, 23, 59, 59), dateTime.secondOfDay().withMaximumValue());
        
        //得到当天的00:00:00
        assertEquals(new DateTime(2014, 12, 2, 0, 0, 0), dateTime.secondOfDay().withMinimumValue());
        
    }

   

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