Joda-Time开源库
Joda-Time是一个面向 Java™ 平台的易于使用的开源时间日期库。
依赖
1 <dependency> 2 <groupId>joda-time</groupId> 3 <artifactId>joda-time</artifactId> 4 <version>2.9.9</version> 5 </dependency>
用法
1.时间日期类生成
1 //方法一：取系统点间 2 DateTime dt1 = new DateTime(); 3 4 //方法二：通过java.util.Date对象生成 5 DateTime dt2 = new DateTime(new Date()); 6 7 //方法三：指定年月日点分秒生成(参数依次是：年,月,日,时,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 //只需要年月日的时候 15 LocalDate localDate = new LocalDate(2009, 9, 6);// September 6, 2009 16 17 //只需要时分秒毫秒的时候 18 LocalTime localTime = new LocalTime(13, 30, 26, 0);// 1:30:26PM
2.获取年月日点分秒
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 //点 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.星期的处理
1 DateTime dt = new DateTime(); 2 3 //星期 4 switch(dt.getDayOfWeek()) { 5 case DateTimeConstants.SUNDAY: 6 System.out.println("星期日"); 7 break; 8 case DateTimeConstants.MONDAY: 9 System.out.println("星期一"); 10 break; 11 case DateTimeConstants.TUESDAY: 12 System.out.println("星期二"); 13 break; 14 case DateTimeConstants.WEDNESDAY: 15 System.out.println("星期三"); 16 break; 17 case DateTimeConstants.THURSDAY: 18 System.out.println("星期四"); 19 break; 20 case DateTimeConstants.FRIDAY: 21 System.out.println("星期五"); 22 break; 23 case DateTimeConstants.SATURDAY: 24 System.out.println("星期六"); 25 break; 26 }
4.与JDK对象转换
1 DateTime dt = new DateTime(); 2 3 //转换成java.util.Date对象 4 Date d1 = new Date(dt.getMillis()); 5 Date d2 = dt.toDate(); 6 7 //转换成java.util.Calendar对象 8 Calendar c1 = Calendar.getInstance(); 9 c1.setTimeInMillis(dt.getMillis()); 10 Calendar c2 = dt.toCalendar(Locale.getDefault());
5.日期前后推算
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个月前 8 DateTime before1month = dt.minusMonths(1); 9 //3个月后 10 DateTime after3month = dt.plusMonths(3); 11 //2年前 12 DateTime before2year = dt.minusYears(2); 13 //5年后 14 DateTime after5year = dt.plusYears(5);
6.时间比较
DateTime d1 = new DateTime("2012-02-01"); DateTime d2 = new DateTime("2012-05-01"); //和系统时间比 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.时间差
1 DateTime begin = new DateTime("2012-02-01"); 2 DateTime end = new DateTime("2012-05-01"); 3 4 //计算区间毫秒数 5 Duration d = new Duration(begin, end); 6 long time = d.getMillis(); 7 8 //计算区间天数 9 Period p = new Period(begin, end, PeriodType.days()); 10 int days = p.getDays(); 11 12 //计算特定日期是否在该区间内 13 Interval i = new Interval(begin, end); 14 boolean contained = i.contains(new DateTime("2012-03-01"));
8.格式化输出
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 DateTimeUtil { 2 public static final String STANDARD_FORMAT = "yyyy-MM-dd HH:mm:ss"; 3 4 public static Date strToDate(String dateTimeStr){ 5 DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern(STANDARD_FORMAT); 6 DateTime dateTime = dateTimeFormatter.parseDateTime(dateTimeStr); 7 return dateTime.toDate(); 8 } 9 10 public static String dateToStr(Date date){ 11 if (date == null){ 12 return StringUtils.EMPTY; 13 } 14 DateTime dateTime = new DateTime(date); 15 return dateTime.toString(STANDARD_FORMAT); 16 } 17 }
参考：https://www.ibm.com/developerworks/cn/java/j-jodatime.html
