java8的时间处理
来源：互联网 发布：数学网络课程哪个好 编辑：程序博客网 时间：2024/05/18 13:25
Java 8 中对时间的处理提供了新的API
对日期时间的处理在实际的开发中是很常见的需要，Java中对时间的处理一直备受诟病。现在这一问题，在新版本的java 8 中，终于有了新的改变。详见Demo。
public class Java8_Date { // java8新特性 public static void main(String args[]){ // 获取当前日期 LocalDate today = LocalDate.now(); System.out.println("Today's Local date : " + today); // 获取年月日 today = LocalDate.now(); int year = today.getYear(); int month = today.getMonthValue(); int day = today.getDayOfMonth(); System.out.printf("Year : %d Month : %d day : %d %n", year, month, day); // 以前的api，Calendar获取本地时区的实例// Calendar localCalendar = Calendar.getInstance(TimeZone.getDefault());//// Date currentTime = localCalendar.getTime();// int currentDay = localCalendar.get(Calendar.DATE);// int currentMonth = localCalendar.get(Calendar.MONTH) + 1;// int currentYear = localCalendar.get(Calendar.YEAR);// int currentDayOfWeek = localCalendar.get(Calendar.DAY_OF_WEEK);// int currentDayOfMonth = localCalendar.get(Calendar.DAY_OF_MONTH);// int CurrentDayOfYear = localCalendar.get(Calendar.DAY_OF_YEAR);//// System.out.println("Current Date and time details in local timezone");// System.out.println("Current Date: " + currentTime);// System.out.println("Current Day: " + currentDay);// System.out.println("Current Month: " + currentMonth);// System.out.println("Current Year: " + currentYear);// System.out.println("Current Day of Week: " + currentDayOfWeek);// System.out.println("Current Day of Month: " + currentDayOfMonth);// System.out.println("Current Day of Year: " + CurrentDayOfYear); // 处理具体日期 LocalDate dateOfBirth0 = LocalDate.of(2010, 01, 14); System.out.println("Your Date of birth is : " + dateOfBirth0); // 判断两个日期是否相等 LocalDate date1 = LocalDate.of(2014, 01, 14); if(date1.equals(today)){ System.out.printf("Today %s and date1 %s are same date %n", today, date1); } // 判断周期性日期大小 LocalDate dateOfBirth = LocalDate.of(2010, 10, 14); MonthDay birthday = MonthDay.of(dateOfBirth.getMonth(), dateOfBirth.getDayOfMonth()); MonthDay currentMonthDay = MonthDay.from(today); if(currentMonthDay.equals(birthday)){ System.out.println("Many Many happy returns of the day !!"); }else{ System.out.println("Sorry, today is not your birthday"); } if(currentMonthDay.isBefore(birthday)){ System.out.println("你今年的生日还没过！"); }else { System.out.println("你今年的生日已过！"); } // 获取当前时间 LocalTime time = LocalTime.now(); System.out.println("local time now : " + time); LocalTime time0 = LocalTime.now(); LocalTime newTime = time0.plusHours(2); // adding two hours System.out.println("两个小时之后 : " + newTime); LocalDate nextWeek = today.plus(1, ChronoUnit.WEEKS); System.out.println("今天是 : " + today); System.out.println("一周之后 : " + nextWeek); LocalDate previousYear = today.minus(1, ChronoUnit.YEARS); System.out.println("一年之前 : " + previousYear); LocalDate nextYear = today.plus(1, ChronoUnit.YEARS); System.out.println("一年之后 : " + nextYear); // Returns the current time based on your system clock and set to UTC. Clock clock = Clock.systemUTC(); System.out.println("Clock : " + clock); System.out.println("格林尼治时间：" + LocalDate.now(clock) + " " + LocalTime.now(clock)); // Returns time based on system clock zone Clock defaultClock = Clock.systemDefaultZone(); System.out.println("Clock : " + defaultClock); System.out.println("北京时间：" + LocalDateTime.now(defaultClock)); // Date and time with timezone in Java 8 ZoneId america = ZoneId.of("America/New_York"); LocalDateTime localtDateAndTime = LocalDateTime.now(); ZonedDateTime dateAndTimeInNewYork = ZonedDateTime.of(localtDateAndTime, america); System.out.println("Current date and time in a particular timezone : " + dateAndTimeInNewYork); YearMonth currentYearMonth = YearMonth.now(); System.out.printf("Days in month year %s: %d%n", currentYearMonth, currentYearMonth.lengthOfMonth()); YearMonth creditCardExpiry = YearMonth.of(2018, Month.FEBRUARY); System.out.printf("Your credit card expires on %s %n", creditCardExpiry); // 是否是闰年 if(today.isLeapYear()){ System.out.println("This year is Leap year"); }else { System.out.println("This year is not a Leap year"); } // 计算两个日期之间的天数和月数 LocalDate java8Release = LocalDate.of(2016, Month.MAY, 14); Period periodToNextJavaRelease = Period.between(today, java8Release); System.out.println("Months left between today and Java 8 release : " + periodToNextJavaRelease.getMonths() ); // 包含时差信息的日期和时间 LocalDateTime datetime = LocalDateTime.of(2014, Month.JANUARY, 14, 19, 30); ZoneOffset offset = ZoneOffset.of("+05:30"); OffsetDateTime date = OffsetDateTime.of(datetime, offset); System.out.println("Date and Time with timezone offset in Java : " + date); // 在Java 8中获取当前的时间戳 Instant timestamp = Instant.now(); System.out.println("What is value of this instant " + timestamp); // 在Java 8中如何使用预定义的格式化工具去解析或格式化日期 String dayAfterTommorrow = "20140116"; LocalDate formatted = LocalDate.parse(dayAfterTommorrow, DateTimeFormatter.BASIC_ISO_DATE); System.out.printf("Date generated from String %s is %s %n", dayAfterTommorrow, formatted); // 如何在Java中使用自定义格式化工具解析日期 String goodFriday = "Nov 13 2015"; try { DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMM dd yyyy"); LocalDate holiday = LocalDate.parse(goodFriday, formatter); System.out.printf("Successfully parsed String %s, date is %s%n", goodFriday, holiday); } catch (DateTimeParseException ex) { System.out.printf("%s is not parsable!%n", goodFriday); ex.printStackTrace(); } // 在Java 8中如何把日期转换成字符串 LocalDateTime arrivalDate = LocalDateTime.now(); try { DateTimeFormatter format = DateTimeFormatter.ofPattern("MMM dd yyyy hh:mm a"); String landing = arrivalDate.format(format); System.out.printf("Arriving at : %s %n", landing); } catch (DateTimeException ex) { System.out.printf("%s can't be formatted!%n", arrivalDate); ex.printStackTrace(); } }}import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.HashMap;import java.util.Map;import java.util.regex.Matcher;import java.util.regex.Pattern;public class TimeDemo { public static void main(String args[]) throws Exception{// System.out.println(DateUtil.getSystemCurrentTimeFormat(DateUtil.getSystemCurrentDate(), "yyyy/MM/dd HH:mm:ss"));// System.out.println(DateUtil.parseDateStringToDate("2013/12/15 12:58:20", "yyyy/MM/dd HH:mm:ss"));// System.out.println(DateUtil.getCurrentYear()); System.out.println(DateUtil.getCountdownValue(380*24*60*60*1000l)); } static class DateUtil{ /** * 获取当前系统的时间 * @return 当前的Date对象 */ public static Date getSystemCurrentDate(){ return new Date(); } public static int getCurrentYear(){ Calendar date = Calendar.getInstance(); return date.get(Calendar.YEAR); } /** * 获取当前系统的时间的毫秒值，自1970-1-1 00:00:00开始的毫秒值 * @return 当前的Date对象的毫秒值 */ public static long getSystemCurrentTimeLong(){ return getSystemCurrentDate().getTime(); } /** * 根据给定的pattern，返回格式化后的Date * @param date Date对象 * @param pattern 格式化模式 * @return 格式化后的时间字符串 */ public static String getSystemCurrentTimeFormat(Date date, String pattern){ SimpleDateFormat sdf = new SimpleDateFormat(pattern); return sdf.format(date); } /** * 将格式化后的时间字符串解析成Date对象 * @param dateString 格式化后的String时间类型，如"2013/12/15 12:58:20" * @param pattern 格式化用的模式String 如"yyyy/MM/dd HH:mm:ss" * @return 返回Date对象 * @throws ParseException 转换异常 */ private static Date parseDateStringToDate(String dateString, String pattern) throws ParseException { DateFormat df = new SimpleDateFormat(pattern); Date date = df.parse(dateString); return date; } public static final String COUNTDOWN_YEAR = "countdown_year"; public static final String COUNTDOWN_MONTH = "countdown_month"; public static final String COUNTDOWN_WEEK = "countdown_week"; public static final String COUNTDOWN_DAY = "countdown_day"; public static final String COUNTDOWN_HOUR = "countdown_hour"; public static final String COUNTDOWN_MINUTE = "countdown_minute"; public static final String COUNTDOWN_SECOND = "countdown_second"; /** * 通过倒计时毫秒值，计算倒计时结果 * @param countdown 倒计时毫秒值 * @return 结果集合 */ private static Map<String, Integer> getCountdownValue(long countdown){ if(countdown < 0){ throw new NumberFormatException("countdown time should not be less than zero!"); } int yearDays, remainingTime; if(isLeapYear(getCurrentYear())){ yearDays = 366; }else { yearDays = 365; } // 总剩余时间距今还有多少个星期 int week = (int) (countdown / 7*24*60*60*1000); // 总剩余时间距今还有多少年 int year = (int) (countdown/(yearDays*24*60*60*1000)); // 刨去年数，剩余时间距今还有多少月、或者多少天（通常的说法：1年零6个月、1年零123天） remainingTime = (int) (countdown%(yearDays*24*60*60*1000)); int day = remainingTime / 24*60*60*1000; int month = getMonthIntervalAfterDays(day); remainingTime = remainingTime % 24*60*60*1000; // 余下的时间求时分秒 int hour = remainingTime / 60*60*1000; remainingTime = remainingTime % 60*60*1000; int minute = remainingTime / 60*1000; remainingTime = remainingTime % 60*60*1000; int second = remainingTime / 1000; Map<String, Integer> resultMap = new HashMap<String, Integer>(); resultMap.put(COUNTDOWN_WEEK, week); resultMap.put(COUNTDOWN_YEAR, year); resultMap.put(COUNTDOWN_MONTH,month); resultMap.put(COUNTDOWN_DAY, day); resultMap.put(COUNTDOWN_HOUR, hour); resultMap.put(COUNTDOWN_MINUTE, minute); resultMap.put(COUNTDOWN_SECOND, second); return resultMap; } /** * 判断是否是闰年 * @param year 给定的年 * @return */ public static boolean isLeapYear(int year){ if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0){ return true; }else{ return false; } } /** * 以当下时间为基准，给定天数后距今相差几个月 * @param d 给定的天数 * @return 相差的天数 */ public static int getMonthIntervalAfterDays(int d){ Calendar date1 = Calendar.getInstance(); Calendar date2 = Calendar.getInstance(); date2.add(Calendar.DAY_OF_MONTH, d); return date2.get(Calendar.MONTH) - date1.get(Calendar.MONTH); } }} 1 0
- java8的时间处理
- JAVA8中时间的处理
- Java8 时间处理
- java8 日期时间处理
- Java8 日期时间处理类
- SpringMVC 返回Java8 时间JSON数据的格式化问题处理
- SpringMVC 返回Java8 时间JSON数据的格式化问题处理
- SpringMVC 返回Java8 时间JSON数据的格式化问题处理
- SpringMVC 返回Java8 时间JSON数据的格式化问题处理
- java8的时间api
- Java8中的日期与时间处理
- Java8的日期、时间类
- JAVA8时间和Mysql时间的关系
- java8的时间 和 java8以下的日期互转
- java8 时间
- java8实战十一:java8----新的日期时间API
- java8 新的日期和时间api
- Java8：新的日期和时间API
- 软件架构
- 大数据时代的技术hive：hive介绍
- Linux磁盘扩容LVM
- tr命令详解
- Leetcode155: Insertion Sort List
- java8的时间处理
- makefile
- dbm和功率值的关系
- Handler Looper MessageQueue 深度总结
- 黑马程序员－OC学习日记2
- 软件的架构与模式之经典架构模式简介
- C++基础::函数、类、类型所在的头文件 && 接口的介绍
- URI、URL、URN介绍
- eas bos editUI 刷新方法 帮助类
