Joda-Time開源庫

摘要： Joda-Time是一個面向 Java™ 平臺的易於使用的開源時間日期庫。 依賴 1 <dependency> 2<groupId>joda-time</groupId> 3<artifactId>joda-time&...

Joda-Time是一個面向 Java™ 平臺的易於使用的開源時間日期庫。

依賴

1 <dependency>
2<groupId>joda-time</groupId>
3<artifactId>joda-time</artifactId>
4<version>2.9.9</version>
5 </dependency>

用法

1.時間日期類生成

 1 //方法一：取系統點間
 2 DateTime dt1 = new DateTime();
 3
 4 //方法二：通過java.util.Date物件生成
 5 DateTime dt2 = new DateTime(new Date());
 6
 7 //方法三：指定年月日點分秒生成(引數依次是：年,月,日,時,分,秒,毫秒)
 8 DateTime dt3 = new DateTime(2012, 5, 20, 13, 14, 0, 0);
 9
10 //方法四：ISO8601形式生成
11 DateTime dt4 = new DateTime("2012-05-20");
12 DateTime dt5 = new DateTime("2012-05-20T13:14:00");
13
14 //只需要年月日的時候
15 LocalDate localDate = new LocalDate(2009, 9, 6);// September 6, 2009
16
17 //只需要時分秒毫秒的時候
18 LocalTime localTime = new LocalTime(13, 30, 26, 0);// 1:30:26PM

2.獲取年月日點分秒

 1 DateTime dt = new DateTime();
 2 //年
 3 int year = dt.getYear();
 4 //月
 5 int month = dt.getMonthOfYear();
 6 //日
 7 int day = dt.getDayOfMonth();
 8 //星期
 9 int week = dt.getDayOfWeek();
10 //點
11 int hour = dt.getHourOfDay();
12 //分
13 int min = dt.getMinuteOfHour();
14 //秒
15 int sec = dt.getSecondOfMinute();
16 //毫秒
17 int msec = dt.getMillisOfSecond(); 

3.星期的處理

 1 DateTime dt = new DateTime();
 2
 3 //星期
 4 switch(dt.getDayOfWeek()) {
 5 case DateTimeConstants.SUNDAY:
 6System.out.println("星期日");
 7break;
 8 case DateTimeConstants.MONDAY:
 9System.out.println("星期一");
10break;
11 case DateTimeConstants.TUESDAY:
12System.out.println("星期二");
13break;
14 case DateTimeConstants.WEDNESDAY:
15System.out.println("星期三");
16break;
17 case DateTimeConstants.THURSDAY:
18System.out.println("星期四");
19break;
20 case DateTimeConstants.FRIDAY:
21System.out.println("星期五");
22break;
23 case DateTimeConstants.SATURDAY:
24System.out.println("星期六");
25break;
26 }

4.與JDK物件轉換

 1 DateTime dt = new DateTime();
 2
 3 //轉換成java.util.Date物件
 4 Date d1 = new Date(dt.getMillis());
 5 Date d2 = dt.toDate();
 6
 7 //轉換成java.util.Calendar物件
 8 Calendar c1 = Calendar.getInstance();
 9 c1.setTimeInMillis(dt.getMillis());
10 Calendar c2 = dt.toCalendar(Locale.getDefault()); 

5.日期前後推算

 1 DateTime dt = new DateTime();
 2
 3 //昨天
 4 DateTime yesterday = dt.minusDays(1);
 5 //明天
 6 DateTime tomorrow = dt.plusDays(1);
 7 //1個月前
 8 DateTime before1month = dt.minusMonths(1);
 9 //3個月後
10 DateTime after3month = dt.plusMonths(3);
11 //2年前
12 DateTime before2year = dt.minusYears(2);
13 //5年後
14 DateTime after5year = dt.plusYears(5);

6.時間比較

DateTime d1 = new DateTime("2012-02-01");
DateTime d2 = new DateTime("2012-05-01");

//和系統時間比
boolean b1 = d1.isAfterNow();
boolean b2 = d1.isBeforeNow();
boolean b3 = d1.isEqualNow();

//和其他日期比
boolean f1 = d1.isAfter(d2);
boolean f2 = d1.isBefore(d2);
boolean f3 = d1.isEqual(d2); 

7.時間差

 1 DateTime begin = new DateTime("2012-02-01");
 2 DateTime end = new DateTime("2012-05-01");
 3
 4 //計算區間毫秒數
 5 Duration d = new Duration(begin, end);
 6 long time = d.getMillis();
 7
 8 //計算區間天數
 9 Period p = new Period(begin, end, PeriodType.days());
10 int days = p.getDays();
11
12 //計算特定日期是否在該區間內
13 Interval i = new Interval(begin, end);
14 boolean contained = i.contains(new DateTime("2012-03-01"));

8.格式化輸出

1 DateTime dateTime = new DateTime();
2
3 String s1 = dateTime.toString("yyyy/MM/dd hh:mm:ss.SSSa");
4 String s2 = dateTime.toString("yyyy-MM-dd HH:mm:ss");
5 String s3 = dateTime.toString("EEEE dd MMMM, yyyy HH:mm:ssa");
6 String s4 = dateTime.toString("yyyy/MM/dd HH:mm ZZZZ");
7 String s5 = dateTime.toString("yyyy/MM/dd HH:mm Z"); 

Joda-Time的Util模板

 1 public class DataTimeUtil{
 2
 3public static final String STANDARD_FORMAT = "yyyy-MM-dd HH:mm:ss";
 4 
 5public static Date strToDate(String dataTimeStr){
 6DataTimeFormatter dateTimeFormatter = DataTimeFormat.forPattern(STANDARD_FORMAT);
 7DateTime dateTime = dateTimeFormatter.parseDateTime(dataTimeStr);
 8return dateTime.toDate();
 9}
10
11public static String dateToStr(Date date){
12if (date = null){
13return StringUtils.EMPTY;
14}
15DateTime dateTime = new Datetime(date);
16return datetime.toString(STANDARD_FORMAT);
17}
18 }

參考：https://www.ibm.com/developerworks/cn/java/j-jodatime.html