程式開發學習之路

我們在開發程式的時候， 常常會需要處理日期， 使用使用 java.util.Calendar 多少會讓開發者有些難處理， 所以因緣際會下我發現了Joda-Time 套件， 發現這套件易於使用是這套件主要的目的， 以下有幾個項目會將展示出其功能

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.sample</groupId>
  <artifactId>joda-time</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
    <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <joda-time.version>2.6</joda-time.version>
 </properties>
 
 <dependencies>
 
  <!-- Joda-Time --> 
  <!-- http://www.ibm.com/developerworks/cn/java/j-jodatime.html -->
  <dependency>
     <groupId>joda-time</groupId>
     <artifactId>joda-time</artifactId>
     <version>${joda-time.version}</version>
    </dependency>
    
 </dependencies>
</project>

package com.joda.example;
import java.util.Date;

import org.joda.time.DateTime;
import org.joda.time.LocalDate;
import org.joda.time.LocalTime;

public class JodaTimeExample_1 {

 /**
  * 基本時間構成
  */
 public static void main(String[] args) {
  
  //取得系統時間
  DateTime dt1 = new DateTime();
  System.out.println("取得系統時間");
  System.out.println(dt1);
  
  System.out.println("--------------------------------------------------");
  
  //通過java.util.Date對象生成
  DateTime dt2 = new DateTime(new Date());
  System.out.println("通過java.util.Date對象生成");
  System.out.println(dt2);
  
  System.out.println("--------------------------------------------------");
  
  //指定年月日點分秒生成(參數依次是：年,月,日,時,分,秒,毫秒)
  DateTime dt3 = new DateTime(2012, 5, 20, 13, 14, 0, 0);
  System.out.println("指定年月日點分秒生成(參數依次是：年,月,日,時,分,秒,毫秒)");
  System.out.println(dt3);
  
  System.out.println("--------------------------------------------------");
  
  //ISO8601形式生成
  DateTime dt4 = new DateTime("2012-05-20");
  DateTime dt5 = new DateTime("2012-05-20T13:14:00");
  System.out.println("ISO8601形式生成");
  System.out.println(dt4);
  System.out.println(dt5);
  
  System.out.println("--------------------------------------------------");
  
  //只需要年月日的時候
  LocalDate localDate = new LocalDate(new Date());
  System.out.println("只需要年月日的時候");
  System.out.println(localDate);
  
  System.out.println("--------------------------------------------------");
  
  //只需要時分秒毫秒的時候
  LocalTime localTime = new LocalTime(new Date());
  System.out.println("只需要時分秒毫秒的時候");
  System.out.println(localTime);
  
  System.out.println("--------------------------------------------------");

 }

}

package com.joda.example;

import java.util.Locale;

import org.joda.time.DateTime;

public class JodaTimeExample_2 {

 /**
  * 取得年月日時分秒
  */
 public static void main(String[] args) {

  //取得系統時間
  DateTime dt = new DateTime();
  System.out.println("取得系統時間");
  System.out.println(dt);
  
  System.out.println("--------------------------------------------------");
  
  System.out.println("取得系統年");
  System.out.println(dt.getYear());
  
  System.out.println("--------------------------------------------------");
  
  System.out.println("取得系統月");
  System.out.println(dt.getMonthOfYear());
  System.out.println(dt.monthOfYear().getAsText());
  System.out.println(dt.monthOfYear().getAsShortText(Locale.US));
  System.out.println(dt.monthOfYear().getAsText(Locale.US));
  
  System.out.println("--------------------------------------------------");
  
  System.out.println("取得系統日");
  System.out.println(dt.getDayOfMonth());
  
  System.out.println("--------------------------------------------------");
  
  System.out.println("取得系統星期");
  System.out.println(dt.getDayOfWeek());
  System.out.println(dt.dayOfWeek().getAsText());
  System.out.println(dt.dayOfWeek().getAsShortText(Locale.US));
  System.out.println(dt.dayOfWeek().getAsText(Locale.US));
  
  System.out.println("--------------------------------------------------");
  
  System.out.println("取得系統小時");
  System.out.println(dt.getHourOfDay());
  
  System.out.println("--------------------------------------------------");
  
  System.out.println("取得系統分鐘");
  System.out.println(dt.getMinuteOfHour());
  
  System.out.println("--------------------------------------------------");
  
  System.out.println("取得系統秒");
  System.out.println(dt.getSecondOfMinute());
  
  System.out.println("--------------------------------------------------");
  
  System.out.println("取得系統毫秒");
  System.out.println(dt.getMillisOfSecond());
  
  System.out.println("--------------------------------------------------");
  System.out.println("取得今年第幾週");
  System.out.println(dt.getWeekOfWeekyear());
  
  System.out.println("--------------------------------------------------");
  System.out.println("取得今年第幾天");
  System.out.println(dt.getDayOfYear());
 
  System.out.println("--------------------------------------------------");
  System.out.println("取得時區");
  System.out.println(dt.getZone());
  
  System.out.println("--------------------------------------------------");
  System.out.println("是否閏年");
  System.out.println(dt.year().isLeap());
  
  System.out.println("--------------------------------------------------");
  System.out.println("當月最大的日期");
  System.out.println(dt.dayOfMonth().getMaximumValue());
 }

}

package com.joda.example;

import org.joda.time.DateTime;
import org.joda.time.DateTimeConstants;

public class JodaTimeExample_3 {

 /**
  * 星期的特殊處理
  */
 public static void main(String[] args) {

  // 取得系統時間
  DateTime dt = new DateTime();
  System.out.println("取得系統時間");
  System.out.println(dt);

  System.out.println("------------------------------------------------------");
  switch (dt.getDayOfWeek()) {
  case DateTimeConstants.SUNDAY:
   System.out.println("星期日");
   break;
  case DateTimeConstants.MONDAY:
   System.out.println("星期一");
   break;
  case DateTimeConstants.TUESDAY:
   System.out.println("星期二");
   break;
  case DateTimeConstants.WEDNESDAY:
   System.out.println("星期三");
   break;
  case DateTimeConstants.THURSDAY:
   System.out.println("星期四");
   break;
  case DateTimeConstants.FRIDAY:
   System.out.println("星期五");
   break;
  case DateTimeConstants.SATURDAY:
   System.out.println("星期六");
   break;
  }

 }

}

package com.joda.example;

import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

import org.joda.time.DateTime;

public class JodaTimeExample_4 {

 /**
  * 與JDK日期物件轉換
  */
 public static void main(String[] args) {

  //取得系統時間
  DateTime dt = new DateTime();
  System.out.println("取得系統時間");
  System.out.println(dt);
    
  System.out.println("------------------------------------------------------");
  
  //轉換成java.util.Date物件
  System.out.println("轉換成java.util.Date物件");
  Date d1 = new Date(dt.getMillis());
  Date d2 = dt.toDate();
  System.out.println(d1);
  System.out.println(d2);
  
  System.out.println("------------------------------------------------------");
  
  //轉換成java.util.Calendar物件
  System.out.println("轉換成java.util.Calendar物件");
  Calendar c1 = Calendar.getInstance();
  c1.setTimeInMillis(dt.getMillis());
  Calendar c2 = dt.toCalendar(Locale.getDefault());
  System.out.println(c1.getTime());
  System.out.println(c2.getTime());
  
 }

}

package com.joda.example;

import org.joda.time.DateTime;

public class JodaTimeExample_5 {

 /**
  * 日期前後推算
  */
 public static void main(String[] args) {
  
  //取得系統時間
  DateTime dt = new DateTime();
  System.out.println("取得系統時間");
  System.out.println(dt);
  
  System.out.println("------------------------------------------------------");
  
  //昨天
  System.out.println("昨天");
  System.out.println(dt.minusDays(1));
  //明天
  System.out.println("明天");
  System.out.println(dt.plusDays(1));
  //1個月前
  System.out.println("1個月前");
  System.out.println(dt.minusMonths(1));
  //1個月後
  System.out.println("1個月後");
  System.out.println(dt.plusMonths(1));
  //2年前
  System.out.println("2年前");
  System.out.println(dt.minusYears(2));
  //2年後
  System.out.println("2年後");
  System.out.println(dt.plusYears(2));

 }

}

package com.joda.example;

import org.joda.time.DateTime;

public class JodaTimeExample_6 {

 /**
  * 取得特殊日期
  */
 public static void main(String[] args) {
  
  //取得系統時間
  DateTime dt = new DateTime();
  System.out.println("取得系統時間");
  System.out.println(dt);
  
  System.out.println("------------------------------------------------------");
  
  //這個月的最後一天日期
  System.out.println("這個月的最後一天日期");
  System.out.println(dt.dayOfMonth().withMaximumValue());
  
  System.out.println("------------------------------------------------------");
  
  //90天後那個星期的星期一日期
  System.out.println("90天後那個星期的星期一日期");
  System.out.println(dt.plusDays(90).dayOfWeek().withMinimumValue());
  

 }

}

package com.joda.example;

import org.joda.time.Chronology;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.chrono.CopticChronology;

public class JodaTimeExample_7 {

 /**
  * 時區
  */
 public static void main(String[] args) {
  
  //取得預設的時區
  Chronology coptic = CopticChronology.getInstance();
  System.out.println("取得預設的時區");
  System.out.println(coptic.getZone());
  
  System.out.println("------------------------------------------------------");
  
  //日本時間
  DateTimeZone.setDefault(DateTimeZone.forID("Asia/Tokyo"));
  DateTime dt = new DateTime();
  System.out.println("日本時間");
  System.out.println(dt);
  
  System.out.println("------------------------------------------------------");
  
  //倫敦時間
  DateTime dt1 = new DateTime(DateTimeZone.forID("Europe/London"));
  System.out.println("倫敦時間");
  System.out.println(dt1);
  
  System.out.println("------------------------------------------------------");
  
  //台灣時間
  DateTime dt2 = new DateTime(DateTimeZone.forID("Asia/Taipei"));
  System.out.println("台灣時間");
  System.out.println(dt2);
  
  System.out.println("------------------------------------------------------");
  
  //台灣時區轉為日本時區
  DateTime jDate1 = new DateTime(dt2, DateTimeZone.forOffsetHours(9));
  DateTime jDate2 = new DateTime(dt2, DateTimeZone.forID("Asia/Tokyo"));
  System.out.println("台灣時區轉為日本時區");
  System.out.println(jDate1);
  System.out.println(jDate2);

 }

}

package com.joda.example;

import org.joda.time.DateTime;

public class JodaTimeExample_8 {

 /**
  * 日期比較
  */
 public static void main(String[] args) {
  
  DateTime d1 = new DateTime("2015-01-01");
  DateTime d2 = new DateTime("2015-05-01");
  
  //與系統時間比較
  boolean b1 = d1.isAfterNow();
  boolean b2 = d1.isBeforeNow();
  boolean b3 = d1.isEqualNow();
  System.out.println("與系統時間比較");
  System.out.println(b1);
  System.out.println(b2);
  System.out.println(b3);
  
  System.out.println("------------------------------------------------------");
  
  //與其他時間比較
  boolean f1 = d1.isAfter(d2);
  boolean f2 = d1.isBefore(d2);
  boolean f3 = d1.isEqual(d2);
  int f4 = d1.compareTo(d2);
  boolean f5 = d1.equals(d2);
  System.out.println("與其他時間比較");
  System.out.println(f1);
  System.out.println(f2);
  System.out.println(f3);
  System.out.println(f4);
  System.out.println(f5);
 }

}

package com.joda.example;

import org.joda.time.DateTime;

public class JodaTimeExample_9 {

 /**
  * 日期格式化
  */
 public static void main(String[] args) {
  
  DateTime dateTime = new DateTime();
  
  //default
  System.out.println(dateTime);
  
  System.out.println("------------------------------------------------------");
  
  //yyyy/MM/dd hh:mm:ss.SSSa
  System.out.println("yyyy/MM/dd hh:mm:ss.SSSa");
  System.out.println(dateTime.toString("yyyy/MM/dd hh:mm:ss.SSSa"));
  
  System.out.println("------------------------------------------------------");
  
  //yyyy/MM/dd hh:mm:ss
  System.out.println("yyyy/MM/dd hh:mm:ss");
  System.out.println(dateTime.toString("yyyy/MM/dd hh:mm:ss"));
  
  System.out.println("------------------------------------------------------");
  
  //EEEE dd MMMM, yyyy HH:mm:ssa
  System.out.println("EEEE dd MMMM, yyyy HH:mm:ssa");
  System.out.println(dateTime.toString("EEEE dd MMMM, yyyy HH:mm:ssa"));
  
  System.out.println("------------------------------------------------------");
  
  //yyyy/MM/dd HH:mm ZZZZ
  System.out.println("yyyy/MM/dd HH:mm ZZZZ");
  System.out.println(dateTime.toString("yyyy/MM/dd HH:mm ZZZZ"));
  
  System.out.println("------------------------------------------------------");
  
  //yyyy/MM/dd HH:mm Z
  System.out.println("yyyy/MM/dd HH:mm Z");
  System.out.println(dateTime.toString("yyyy/MM/dd HH:mm Z"));
  
 }

}

package com.joda.example;

import org.joda.time.DateTime;
import org.joda.time.Duration;
import org.joda.time.Interval;
import org.joda.time.Period;
import org.joda.time.PeriodType;

public class JodaTimeExample_10 {

 /**
  * 計算區間
  */
 public static void main(String[] args) {
  
  DateTime begin = new DateTime("2015-01-01");
  DateTime end = new DateTime("2015-05-01");
  
  //計算區間毫秒數
  Duration d = new Duration(begin, end);
  System.out.println("計算區間毫秒數");
  System.out.println(d.getMillis());
  
  System.out.println("------------------------------------------------------");
  
  //計算區間天數
  Period p = new Period(begin, end, PeriodType.days());
  System.out.println("計算區間天數");
  System.out.println(p.getDays());
  
  System.out.println("------------------------------------------------------");
  
  //計算特定日期是否在該區間內
  Interval i = new Interval(begin, end);
  System.out.println("計算特定日期是否在該區間內");
  System.out.println(i.contains(new DateTime("2015-03-01")));
  System.out.println(i.contains(new DateTime("2014-03-01")));
  
 }

}

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