joda-time 时间API

骑猪看日落 2022-07-24 12:15 215阅读 0赞

Joda-Time   
  
Home： [http://joda-time.sourceforge.net/][http_joda-time.sourceforge.net]    
  
JavaDoc： [http://joda-time.sourceforge.net/apidocs/index.html][http_joda-time.sourceforge.net_apidocs_index.html]    
  
直接看代码,这是在网上和根据API整理的一些例子,使用时看例子就可以了

Java代码   ![收藏代码][icon_star.png]

1.  **package** com.yan.joda;  
2.    
3.  **import** java.util.Calendar;  
4.  **import** java.util.Date;  
5.  **import** java.util.Locale;  
6.  **import** org.joda.time.DateTime;  
7.  **import** org.joda.time.Days;  
8.  **import** org.joda.time.LocalDate;  
9.  **import** org.joda.time.format.DateTimeFormat;  
10. **import** org.joda.time.format.DateTimeFormatter;  
11.   
12. **public** **class** JodaTest \{  
13.   
14.     **public** **static** **void** main(String\[\] args) \{  
15.         //初始化时间  
16.                 DateTime dateTime=**new** DateTime(2012, 12, 13, 18, 23,55);  
17.                   
18.                 // 年,月,日,时,分,秒,毫秒    
19.                 DateTime dt3 = **new** DateTime(2011, 2, 13, 10, 30, 50, 333);// 2010年2月13日10点30分50秒333毫秒  
20.                   
21.                 //下面就是按照一点的格式输出时间  
22.                 String str2 = dateTime.toString("MM/dd/yyyy hh:mm:ss.SSSa");  
23.                 String str3 = dateTime.toString("dd-MM-yyyy HH:mm:ss");  
24.                 String str4 = dateTime.toString("EEEE dd MMMM, yyyy HH:mm:ssa");  
25.                 String str5 = dateTime.toString("MM/dd/yyyy HH:mm ZZZZ");  
26.                 String str6 = dateTime.toString("MM/dd/yyyy HH:mm Z");  
27.                   
28.                 DateTimeFormatter format = DateTimeFormat .forPattern("yyyy-MM-dd HH:mm:ss");  
29.                 //时间解析    
30.                 DateTime dateTime2 = DateTime.parse("2012-12-21 23:22:45", format);    
31.                     
32.                 //时间格式化，输出==> 2012/12/21 23:22:45 Fri    
33.                 String string\_u = dateTime2.toString("yyyy/MM/dd HH:mm:ss EE");    
34.                 System.out.println(string\_u);    
35.                     
36.                 //格式化带Locale，输出==> 2012年12月21日 23:22:45 星期五    
37.                 String string\_c = dateTime2.toString("yyyy年MM月dd日 HH:mm:ss EE",Locale.CHINESE);    
38.                 System.out.println(string\_c);  
39.                   
40.                 DateTime dt1 = **new** DateTime();// 取得当前时间  
41.                    
42.                 // 根据指定格式,将时间字符串转换成DateTime对象,这里的格式和上面的输出格式是一样的    
43.                 DateTime dt2 = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss").parseDateTime("2012-12-26 03:27:39");  
44.                   
45.                 //计算两个日期间隔的天数  
46.                 LocalDate start=**new** LocalDate(2012, 12,14);    
47.                 LocalDate end=**new** LocalDate(2013, 01, 15);    
48.                 **int** days = Days.daysBetween(start, end).getDays();  
49.                   
50.                 //计算两个日期间隔的小时数,分钟数,秒数  
51.                   
52.                 //增加日期  
53.                 DateTime dateTime1 = DateTime.parse("2012-12-03");  
54.                 dateTime1 = dateTime1.plusDays(30);  
55.                 dateTime1 = dateTime1.plusHours(3);  
56.                 dateTime1 = dateTime1.plusMinutes(3);  
57.                 dateTime1 = dateTime1.plusMonths(2);  
58.                 dateTime1 = dateTime1.plusSeconds(4);  
59.                 dateTime1 = dateTime1.plusWeeks(5);  
60.                 dateTime1 = dateTime1.plusYears(3);  
61.                   
62.                 // Joda-time 各种操作.....    
63.                 dateTime = dateTime.plusDays(1) // 增加天    
64.                                     .plusYears(1)// 增加年    
65.                                     .plusMonths(1)// 增加月    
66.                                     .plusWeeks(1)// 增加星期    
67.                                     .minusMillis(1)// 减分钟    
68.                                     .minusHours(1)// 减小时    
69.                                     .minusSeconds(1);// 减秒数  
70.                   
71.                 //判断是否闰月    
72.                 DateTime dt4 = **new** DateTime();    
73.                 org.joda.time.DateTime.Property month = dt4.monthOfYear();    
74.                 System.out.println("是否闰月:" + month.isLeap());  
75.                   
76.                 //取得 3秒前的时间    
77.                 DateTime dt5 = dateTime1.secondOfMinute().addToCopy(-3);    
78.                 dateTime1.getSecondOfMinute();// 得到整分钟后，过的秒钟数    
79.                 dateTime1.getSecondOfDay();// 得到整天后，过的秒钟数    
80.                 dateTime1.secondOfMinute();// 得到分钟对象,例如做闰年判断等使用  
81.                   
82.                 // DateTime与java.util.Date对象,当前系统TimeMillis转换    
83.                 DateTime dt6 = **new** DateTime(**new** Date());    
84.                 Date date = dateTime1.toDate();    
85.                 DateTime dt7 = **new** DateTime(System.currentTimeMillis());    
86.                 dateTime1.getMillis();   
87.                   
88.                 Calendar calendar = Calendar.getInstance();    
89.                 dateTime = **new** DateTime(calendar);  
90.     \}  
91. \}

下面是一个小例子用来计算小宝宝从出生到现在总共的天数小时数等，首先用jdk的类去做，不用joda,然后再用joda去做，以做比较   
  
用jdk做的例子,这里算的从出生到现在的时间间隔是准确的，如果是输入的某天来算的话就不是很准确，多一秒就算一天。可以看到用jdk去做的话，要写的代码还是挺繁琐的。

Java代码   ![收藏代码][icon_star.png]

1.  **import** java.text.SimpleDateFormat;  
2.  **import** java.util.Calendar;  
3.  **import** java.util.Date;  
4.  **import** java.util.Scanner;  
5.    
6.  **public** **class** CalBaby \{  
7.      **private** **final** **static** String birthday = "2012-3-10 08:20:55";  
8.      /\*\* 
9.       \* @param args 
10.      \*/  
11.     **public** **static** **void** main(String\[\] args) \{  
12.         **while**(**true**)\{  
13.             String format1 = "yyyy-MM-dd";  
14.             String format2 = "yyyy-MM-dd HH:mm:ss";  
15.             Scanner s = **new** Scanner(System.in);  
16.             System.out.println("\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#");  
17.             cutTwoDateToDay(convertToDate1(birthday,format2),**new** Date(),**false**);  
18.             System.out.println("请选择操作");  
19.             System.out.println("请输入日期(格式例如:2012-11-08)");  
20.             System.out.println("\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#");  
21.             String endDateStr = s.nextLine();  
22.             Date endDate = convertToDate1(endDateStr,format1);  
23.             **if**(endDate == **null**)\{  
24.                 System.out.println("输入格式错误!请重新输入.");  
25.                 **continue**;  
26.             \}  
27.             **boolean** inputFlag = **true**;  
28.             cutTwoDateToDay(convertToDate1(birthday,format2),endDate,inputFlag);  
29.         \}  
30.           
31.     \}  
32.       
33.     /\*\*  
34.      \* 计算两个日期之间的差距天数  
35.      \*   
36.      \* @param a  
37.      \* @param b  
38.      \* @return  
39.      \*/    
40.     **public** **static** **void** cutTwoDateToDay(Date beginDate, Date endDate,**boolean** inputFlag) \{    
41.         Calendar calendar = Calendar.getInstance();    
42.         **long** intervalDays = 0;    
43.         calendar.setTime(beginDate);    
44.         **long** begin = calendar.getTimeInMillis();    
45.         calendar.setTime(endDate);    
46.         **long** end = calendar.getTimeInMillis();  
47.         **long** totalM = end - begin;  
48.         System.out.println((end -begin));  
49.         System.out.println(24\*60\*60\*1000);  
50.         intervalDays = totalM /(24\*60\*60\*1000);  
51.         **long** intervalHours = (totalM - (intervalDays\*24\*60\*60\*1000))/(60\*60\*1000);  
52.        **long** intervalMin = (totalM - intervalDays \* (24\*60\*60\*1000) - intervalHours\*60\*60\*1000)/(60\*1000);  
53.        **if**(inputFlag)\{  
54.            **if**(totalM > 0L && totalM %(24\*60\*60\*1000) > 0L)\{  
55.                intervalDays = intervalDays + 1;  
56.            \}  
57.            System.out.println("宝宝从出生到"\+formatDate(endDate,"yyyy-MM-dd")+"已经"\+intervalDays+"天了");  
58.        \}**else**\{  
59.            System.out.println("宝宝来到这个世界已经"\+intervalDays+"天"\+intervalHours+"小时"\+intervalMin+"分钟了");  
60.        \}  
61.           
62.     \}   
63.       
64.     /\*\*  
65.      \* 将字符串日期转换为Date   yyyy-MM-dd HH:mm:ss  yyyy-MM-dd 
66.      \*   
67.      \* @param s  
68.      \* @return  
69.      \*/    
70.     **public** **static** Date convertToDate1(String s,String format) \{    
71.   
72.         **if** (s == **null**) \{    
73.             **return** **null**;    
74.         \}    
75.         **try** \{    
76.             SimpleDateFormat df = **new** SimpleDateFormat(format);    
77.             **return** df.parse(s);    
78.         \} **catch** (Exception e) \{    
79.             **return** **null**;    
80.         \}    
81.     \}  
82.           
83.     **public** **static** String formatDate(Date date, String strType)  
84.     \{  
85.         **if** (date == **null**)  
86.         \{  
87.             **return** **null**;  
88.         \}  
89.   
90.         SimpleDateFormat sdf = **new** SimpleDateFormat(strType);  
91.         **try**  
92.         \{  
93.             **return** sdf.format(date);  
94.         \}  
95.         **catch** (Exception e)  
96.         \{  
97.             **return** **null**;  
98.         \}  
99.     \}  
100. \}

下面是用joda来做，用这个来做就简单的多了，而且也很准确。

Java代码   ![收藏代码][icon_star.png]

1.  **import** java.util.Scanner;  
2.  **import** org.joda.time.DateTime;  
3.  **import** org.joda.time.Days;  
4.  **import** org.joda.time.LocalDate;  
5.  **import** org.joda.time.format.DateTimeFormat;  
6.  **import** org.joda.time.format.DateTimeFormatter;  
7.    
8.  **public** **class** CalBabyJoda \{  
9.        
10.     **private** **final** **static** String birthday = "2012-3-10 08:20:55";  
11.   
12.     **public** **static** **void** main(String\[\] args) \{  
13.         **while**(**true**)\{  
14.             Scanner s = **new** Scanner(System.in);  
15.             System.out.println("\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#");  
16.             DateTimeFormatter format1 = DateTimeFormat .forPattern("yyyy-MM-dd HH:mm:ss");  
17.             DateTimeFormatter format2 = DateTimeFormat .forPattern("yyyy-MM-dd");  
18.             DateTime startDateTime = DateTime.parse(birthday, format1);  
19.             System.out.println("宝宝来到这个世界已经");  
20.             calDateToDay(startDateTime,**new** DateTime());  
21.             System.out.println("如选择其它日期请输入(格式例如:2012-11-08 14:24:54或着2012-11-08)");  
22.             System.out.println("\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#");  
23.             String endDate = s.nextLine();  
24.             DateTime endDateTime = **null**;  
25.             **try**\{  
26.                 endDateTime = DateTime.parse(endDate,format1);  
27.             \}**catch**(Exception e)\{  
28.                 **try**\{  
29.                     endDateTime = DateTime.parse(endDate,format2);  
30.                 \}**catch**(Exception e1)\{  
31.                     System.out.println("输入格式错误!请重新输入.");  
32.                     **continue**;  
33.                 \}  
34.             \}  
35.             System.out.println("宝宝从出生到" + endDateTime.toString("yyyy-MM-dd HH:mm:ss") + "已经");  
36.             calDateToDay(startDateTime,endDateTime);  
37.         \}  
38.     \}  
39.       
40.     **public** **static** **void** calDateToDay(DateTime startDateTime,DateTime endDateTime)\{  
41.           
42.          LocalDate start=**new** LocalDate(startDateTime);    
43.         LocalDate end=**new** LocalDate(endDateTime);  
44.         Days days = Days.daysBetween(start, end);  
45.         **int** intervalDays = days.getDays();  
46.         **int** intervalHours = endDateTime.getHourOfDay() - startDateTime.getHourOfDay();  
47.         **int** intervalMinutes = endDateTime.getMinuteOfHour() - startDateTime.getMinuteOfHour();  
48.         **int** intervalSeconds = endDateTime.getSecondOfMinute() - startDateTime.getSecondOfMinute();  
49.           
50.           
51.         **if**(intervalSeconds < 0)\{  
52.             intervalMinutes = intervalMinutes -1;  
53.             intervalSeconds = 60 + intervalSeconds;  
54.         \}  
55.           
56.         **if**(intervalMinutes < 0)\{  
57.             intervalHours = intervalHours -1;  
58.             intervalMinutes = 60 + intervalMinutes;  
59.         \}  
60.           
61.         **if**(intervalHours < 0)\{  
62.             intervalDays = intervalDays -1;  
63.             intervalHours = 24 + intervalHours;  
64.         \}  
65.                   
66.         System.out.println(intervalDays + "天" + intervalHours +   
67.                 "小时" + intervalMinutes + "分钟" + intervalSeconds + "秒");  
68.         System.out.println("\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#");  
69.     \}  
70.   
71. \}

时间比较：

private boolean isIntervalLess2Minute(String createtime)\{  
DateTimeFormatter format = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");  
DateTime datetime = DateTime.parse(createtime.substring(0, createtime.indexOf(".")), format);   
DateTime currentTime = new DateTime();  
int diff = Minutes.minutesBetween(datetime, currentTime).getMinutes();  
if(diff>2)\{  
return false;  
\}else\{  
return true;  
\}  
\}

[http_joda-time.sourceforge.net]: http://joda-time.sourceforge.net/
[http_joda-time.sourceforge.net_apidocs_index.html]: http://joda-time.sourceforge.net/apidocs/index.html
[icon_star.png]: /images/20220722/354ed24bf34f4cb0b748988ee382c088.png