Joda-Time&Date4j使用研究-开源JAVA日期时间处理类库
1)Joda-Time简介
Joda-Time提供了一组Java类包用于处理包括ISO8601标准在内的date和time。可以利用它把JDK Date和Calendar类完全替换掉，而且仍然能够提供很好的集成。
Joda-Time主要的特点包括：
1. 易于使用:Calendar让获取"正常的"的日期变得很困难，使它没办法提供简单的方法，而Joda-Time能够 直接进行访问域并且索引值1就是代表January。
2. 易于扩展：JDK支持多日历系统是通过Calendar的子类来实现，这样就显示的非常笨重而且事实 上要实现其它日历系统是很困难的。Joda-Time支持多日历系统是通过基于Chronology类的插件体系来实现。
3. 提供一组完整的功能：它打算提供 所有关系到date-time计算的功能．Joda-Time当前支持6种日历系统，而且在将来还会继续添加。有着比JDK Calendar更好的整体性能等等。
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2)代码实现如下：
package test;
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import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
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import org.joda.time.DateTime;
import org.joda.time.LocalDate;
import org.joda.time.LocalTime;
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/**
?* @author gaozzsoft
?*
?*/
public class MyJodaTimeTest {
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/**
* @param args
*/
public static void main(String[] args) {
//1
Calendar calendar = Calendar.getInstance();
calendar.set(2000, Calendar.JANUARY, 1, 0, 0, 0);
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DateTime dateTime = new DateTime(2000, 1, 1, 0, 0, 0, 0);
System.out.println(dateTime.toString("E MM/dd/yyyy HH:mm:ss.SSS"));
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//2?
Calendar calendar2 = Calendar.getInstance();
calendar2.set(2000, Calendar.JANUARY, 1, 0, 0, 0);
SimpleDateFormat sdf =
?new SimpleDateFormat("E MM/dd/yyyy HH:mm:ss.SSS");
calendar2.add(Calendar.DAY_OF_MONTH, 90);
System.out.println(sdf.format(calendar2.getTime()));
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DateTime dateTime2 = new DateTime(2000, 1, 1, 0, 0, 0, 0);
System.out.println(dateTime2.plusDays(90).toString("E MM/dd/yyyy HH:mm:ss.SSS"));
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DateTime dateTime3 = new DateTime(2000, 1, 1, 0, 0, 0, 0);
System.out.println(dateTime3.plusDays(45).plusMonths(1).dayOfWeek()
?.withMaximumValue().toString("E MM/dd/yyyy HH:mm:ss.SSS"));
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//3
Calendar calendar3 = Calendar.getInstance();
DateTime dateTime4 = new DateTime(2000, 1, 1, 0, 0, 0, 0);
System.out.println(dateTime4.plusDays(45).plusMonths(1).dayOfWeek()
?.withMaximumValue().toString("E MM/dd/yyyy HH:mm:ss.SSS"));
calendar3.setTime(dateTime4.toDate());
System.out.println(calendar3.getTime());
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//4
DateTime dateTime5 = new DateTime();
//DateTime dateTime6 = SystemFactory.getClock().getDateTime();
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DateTime dateTime7 = new DateTime(
?2000, //year
?1, ? ?// month
?1, ? ?// day
?0, ? ?// hour (midnight is zero)
?0, ? ?// minute
?0, ? ?// second
?0 ? ? // milliseconds
);
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//java.util.Date jdkDate = obtainDateSomehow();
//long timeInMillis = jdkDate.getTime();
//DateTime dateTime = new DateTime(timeInMillis);
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//java.util.Date jdkDate = obtainDateSomehow();
//dateTime = new DateTime(jdkDate);
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//5
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// Use a Calendar
//java.util.Calendar calendar4 = obtainCalendarSomehow();
//dateTime = new DateTime(calendar4);
// Use another Joda DateTime
//DateTime anotherDateTime = obtainDateTimeSomehow();
//dateTime = new DateTime(anotherDateTime);
// Use a String (must be formatted properly)
String timeString = "2006-01-26T13:30:00-06:00";
dateTime = new DateTime(timeString);
timeString = "2006-01-26";
DateTime dateTime8 = new DateTime(timeString);
System.out.println(dateTime8.toString("E MM/dd/yyyy HH:mm:ss"));
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//6
//LocalDate localDate1 = SystemFactory.getClock().getLocalDate();
LocalDate localDate2 = new LocalDate(2009, 9, 6);// September 6, 2009
//LocalTime localTime1 = SystemFactory.getClock().getLocalTime();
LocalTime localTime2 = new LocalTime(13, 30, 26, 0);// 1:30:26PM
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//计算 11 月中第一个星期一之后的第一个星期二
//LocalDate now = SystemFactory.getClock().getLocalDate();
//LocalDate electionDate = now.monthOfYear()
// .setCopy(11) ? ? ? ?// November
// .dayOfMonth() ? ? ? // Access Day Of Month Property
// .withMinimumValue() // Get its minimum value
// .plusDays(6) ? ? ? ?// Add 6 days
// .dayOfWeek() ? ? ? ?// Access Day Of Week Property
// .setCopy("Monday") ?// Set to Monday (it will round down)
// .plusDays(1); ? ? ? // Gives us Tuesday
//
//
//LocalDate now = SystemFactory.getClock().getLocalDate();
//LocalDate lastDayOfPreviousMonth =\
// ?now.minusMonths(1).dayOfMonth().withMaximumValue();?
//
//DateTime now = SystemFactory.getClock().getDateTime();
//DateTime then = now.plusWeeks(2);
//
//DateTime now = SystemFactory.getClock().getDateTime();
//DateTime tomorrow = now.plusDays(1);
//DateTime then = tomorrow.plusDays(90);
//
//DateTime now = SystemFactory.getClock().getDateTime();
//DateTime then = now.plusSeconds(156);
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//DateTime now = SystemFactory.getClock().getDateTime();
//DateTime then = now.minusYears(5) // five years ago
// ? ? ? ? ? ? ? .monthOfYear() ? ? // get monthOfYear property
// ? ? ? ? ? ? ? .setCopy(2) ? ? ? ?// set it to February
// ? ? ? ? ? ? ? .dayOfMonth() ? ? ?// get dayOfMonth property
// ? ? ? ? ? ? ? .withMaximumValue();// the last day of the month
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//DateTime dateTime = SystemFactory.getClock().getDateTime();
//Calendar calendar = dateTime.toCalendar(Locale.getDefault());
//Date date = dateTime.toDate();
//DateMidnight dateMidnight = SystemFactory.getClock()
// ?.getDateMidnight();
//date = dateMidnight.toDate();
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//LocalDate localDate = SystemFactory.getClock().getLocalDate();
//Date date = localDate.toDateMidnight().toDate();
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//DateTime dateTime = SystemFactory.getClock().getDateTime();
//dateTime.toString(ISODateTimeFormat.basicDateTime());
//dateTime.toString(ISODateTimeFormat.basicDateTimeNoMillis());
//dateTime.toString(ISODateTimeFormat.basicOrdinalDateTime());
//dateTime.toString(ISODateTimeFormat.basicWeekDateTime());
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//DateTime dateTime = SystemFactory.getClock().getDateTime();
//dateTime.toString("MM/dd/yyyy hh:mm:ss.SSSa");
//dateTime.toString("dd-MM-yyyy HH:mm:ss");
//dateTime.toString("EEEE dd MMMM, yyyy HH:mm:ssa");
//dateTime.toString("MM/dd/yyyy HH:mm ZZZZ");
//dateTime.toString("MM/dd/yyyy HH:mm Z");
//
//09/06/2009 02:30:00.000PM
//06-Sep-2009 14:30:00
//Sunday 06 September, 2009 14:30:00PM
//09/06/2009 14:30 America/Chicago
//09/06/2009 14:30 -0500
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}
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}
(二)date4j是一个用于简化日期和时间操作的Java工具。可以替换java.util.Date。
代码实现如下：
package test;
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import hirondelle.date4j.DateTime;
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/**
?* @author gaozzsoft
?*
?*/
public class MyDate4jTest {
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/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
//Examples ?
//Here are some quick examples of using date4j's DateTime class : ?
DateTime dateAndTime = new DateTime("2010-01-19 23:59:59"); ?
DateTime dateAndTime2 = new DateTime("2010-01-19 23:59:59.123456789"); ?
DateTime dateOnly = new DateTime("2010-01-19"); ?
DateTime timeOnly = new DateTime("23:59:59"); ?
DateTime dateOnly2 = DateTime.forDateOnly(2010,01,19); ?
DateTime timeOnly2 = DateTime.forTimeOnly(23,59,59,0); ?
DateTime dt = new DateTime("2010-01-15 13:59:15"); ?
boolean leap = dt.isLeapYear(); //false ?
dt.getNumDaysInMonth(); //31 ?
dt.getStartOfMonth(); //2010-01-01, 00:00:00.000000000 ?
dt.getEndOfDay(); //2010-01-15, 23:59:59.999999999 ?
dt.format("YYYY-MM-DD"); //formats as '2010-01-15' ?
dt.plusDays(30); //30 days after Jan 15 ?
//dt.numDaysFrom(someDate); //returns an int ?
//dueDate.lt(someDate); //less-than ?
//dueDate.lteq(someDate); //less-than-or-equal-to ?
//Although DateTime carries no TimeZone information internally, there are methods that take a TimeZone as a parameter : ?
//DateTime now = DateTime.now(someTimeZone); ?
//DateTime today = DateTime.today(someTimeZone); ?
//DateTime fromMilliseconds = DateTime.forInstant(31313121L, someTimeZone); ?
//birthday.isInFuture(someTimeZone); ?
//dt.changeTimeZone(fromOneTimeZone, toAnotherTimeZone); ?
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}
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}
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