Java tutorial
/** * Copyright © 2012-2013 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); */ package com.li.bus.utils; import org.apache.commons.lang.time.DateFormatUtils; import java.sql.Timestamp; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.List; /** * , org.apache.commons.lang.time.DateUtils * * @author ThinkGem * @version 2013-3-15 */ public class DateUtils extends org.apache.commons.lang.time.DateUtils { private static String[] parsePatterns = { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm" }; private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); /** * ? ?yyyy-MM-dd */ public static String getDate() { return getDate("yyyy-MM-dd"); } /** * ? ?yyyy-MM-dd pattern?"yyyy-MM-dd" "HH:mm:ss" "E" */ public static String getDate(String pattern) { return DateFormatUtils.format(new Date(), pattern); } /** * ?yyyy-MM-dd pattern?"yyyy-MM-dd" "HH:mm:ss" "E" */ public static String formatDate(Date date, Object... pattern) { String formatDate = null; if (pattern != null && pattern.length > 0) { formatDate = DateFormatUtils.format(date, pattern[0].toString()); } else { formatDate = DateFormatUtils.format(date, "yyyy-MM-dd"); } return formatDate; } /** * ?yyyy-MM-dd pattern?"yyyy-MM-dd" "HH:mm:ss" "E" */ public static String formatUTCDate(Date date, Object... pattern) { String formatDate = null; if (pattern != null && pattern.length > 0) { formatDate = DateFormatUtils.formatUTC(date, pattern[0].toString()); } else { formatDate = DateFormatUtils.formatUTC(date, "yyyy-MM-dd"); } return formatDate; } /** * ??yyyy-MM-dd HH:mm:ss */ public static String formatDateTime(Date date) { return formatDate(date, "yyyy-MM-dd HH:mm:ss"); } /** * ??yyyy-MM-dd HH:mm:ss */ public static String formatUTCDateTime(Date date) { return formatUTCDate(date, "yyyy-MM-dd HH:mm:ss"); } /** * ? ?HH:mm:ss */ public static String getTime() { return formatDate(new Date(), "HH:mm:ss"); } /** * ? ?yyyy-MM-dd HH:mm:ss */ public static String getDateTime() { return formatDate(new Date(), "yyyy-MM-dd HH:mm:ss"); } /** * ? ?yyyy */ public static String getYear() { return formatDate(new Date(), "yyyy"); } /** * ? ?MM */ public static String getMonth() { return formatDate(new Date(), "MM"); } /** * ?dd */ public static String getDay() { return formatDate(new Date(), "dd"); } /** * ? ?E */ public static int getWeek() { return getWeek(new Date()); } /** * ? ?E */ public static int getWeek(Date date) { Calendar c = Calendar.getInstance(); c.setTime(date); if (c.get(Calendar.DAY_OF_WEEK) == 1) { return 7; } else { return c.get(Calendar.DAY_OF_WEEK) - 1; } } /** * ? * { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", * "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm" } */ public static Date parseDate(Object str) { if (str == null) { return null; } try { return parseDate(str.toString(), parsePatterns); } catch (ParseException e) { return null; } } /** * ? * * @param date * @return */ public static long pastDays(Date date) { long t = new Date().getTime() - date.getTime(); return t / (24 * 60 * 60 * 1000); } public static Date getDateStart(Date date) { if (date == null) { return null; } SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { date = sdf.parse(formatDate(date, "yyyy-MM-dd") + " 00:00:00"); } catch (ParseException e) { e.printStackTrace(); } return date; } public static Date getDateEnd(Date date) { if (date == null) { return null; } SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { date = sdf.parse(formatDate(date, "yyyy-MM-dd") + " 23:59:59"); } catch (ParseException e) { e.printStackTrace(); } return date; } /** * getDay:??. <br/> * * @param gap ?(0,1,-1....) * @return * @author zyyang3 * @since JDK 1.6 */ public static String getDay(int gap) { Calendar cal = Calendar.getInstance(); cal.add(Calendar.DAY_OF_MONTH, gap); Date date = cal.getTime(); String day = DateFormatUtils.format(date, "yyyy-MM-dd"); return day; } /** * getDay:?. <br/> * * @param gap (0,1,-1....) * @return * @throws ParseException * @author zyyang3 * @since JDK 1.6 */ public static String getDay(String time, int gap) throws ParseException { Calendar cal = Calendar.getInstance(); Date datetmp = sdf.parse(time); cal.setTime(datetmp); cal.add(Calendar.DAY_OF_MONTH, gap); Date date = cal.getTime(); String day = DateFormatUtils.format(date, "yyyy-MM-dd"); return day; } public static Date addDay(Date dtime, int days) { Calendar calendar = Calendar.getInstance(); calendar.setTime(dtime); calendar.add(Calendar.DAY_OF_MONTH, days); return calendar.getTime(); } public static Date addMonth(Date dtime, int month) { Calendar calendar = Calendar.getInstance(); calendar.setTime(dtime); calendar.add(Calendar.MONTH, month); return calendar.getTime(); } public static int daysBetween(Date smdate, Date bdate) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); smdate = sdf.parse(sdf.format(smdate)); bdate = sdf.parse(sdf.format(bdate)); Calendar cal = Calendar.getInstance(); cal.setTime(smdate); long time1 = cal.getTimeInMillis(); cal.setTime(bdate); long time2 = cal.getTimeInMillis(); long between_days = (time2 - time1) / (1000 * 3600 * 24); return Integer.parseInt(String.valueOf(between_days)); } /*** * * * @Title: getDayStart * @param formatTime * @throws */ public static Date getDayStart(String formatTime) { Date date = parseDate(formatTime); long time = date.getTime(); return new Date(getDayStart(time)); } /*** * * * @Title: getDayStart * @param date * @throws */ public static Date getDayStart(Date date) { long time = date.getTime(); return new Date(getDayStart(time)); } /*** * ? * * @Title: getDayEnd * @param date * @throws */ public static Date getDayEnd(Date date) { long time = date.getTime(); return new Date(getDayEnd(time)); } /*** * ? * * @Title: getDayEnd * @param formatTime * @throws */ public static Date getDayEnd(String formatTime) { Date date = parseDate(formatTime); long time = date.getTime(); return new Date(getDayEnd(time)); } /*** * ? * * @Title: getDayEnd * @param time * @throws */ public static long getDayEnd(long time) { return getDayStart(time) + 86400000; } /*** * * * @Title: getDayStart * @param time * @throws */ public static long getDayStart(long time) { long t = (time + 28800000) % 86400000; return time - t; } /*** * * @Title: getMonday * @param date * @throws */ public static Date getMonday(Date date) { Calendar cal = date2Calendar(date); cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); return cal.getTime(); } /*** * ? * @Title: getFirstDayOfMonth * @param date * @throws */ public static Date getFirstDayOfMonth(Date date) { Calendar cal = date2Calendar(date); cal.set(Calendar.DAY_OF_MONTH, 1); return cal.getTime(); } /*** * ? * @Title: getLastDayOfMonth * @param date * @throws */ public static Date getLastDayOfMonth(Date date) { Calendar cal = date2Calendar(date); cal.setTime(date); cal.set(Calendar.DAY_OF_MONTH, 1); cal.roll(Calendar.DAY_OF_MONTH, -1); return cal.getTime(); } /** * date> date1 true * ? false * @param date * @param date1 * @return */ public static Boolean compare(Date date, Date date1) { return date.getTime() > date1.getTime(); } /** * Date?Calendar * * @param d * @return */ public static Calendar date2Calendar(Date d) { Calendar c = Calendar.getInstance(); c.setTime(d); return c; } /** * Calendar?Date * * @param c * @return */ public static Date calendar2Date(Calendar c) { return c.getTime(); } /** * Date?Timestamp * * @param d * @return */ public static Timestamp date2Timestamp(Date d) { return new Timestamp(d.getTime()); } /** * Calendar?Timestamp * * @param c * @return */ public static Timestamp calendar2Timestamp(Calendar c) { return new Timestamp(c.getTimeInMillis()); } /** * Timestamp?Calendar * * @param ts * @return */ public static Calendar timestamp2Calendar(Timestamp ts) { Calendar c = Calendar.getInstance(); c.setTime(ts); return c; } /** * @param args * @throws ParseException */ public static void main(String[] args) throws ParseException { // System.out.println(formatDate(parseDate("2010/3/6"))); // System.out.println(getDate("yyyyMMdd E")); // long time = new Date().getTime()-parseDate("2012-11-19").getTime(); // System.out.println(time/(24*60*60*1000)); /* System.out.println(getDay(-1)); System.out.println(getDay(-8)); */ } /** * ? * @param date_begin * @param date_end * @return */ public static List<Date> getDates(Date date_begin, Date date_end) { Calendar beginCal = Calendar.getInstance(); beginCal.setTime(date_begin); Calendar endCal = Calendar.getInstance(); endCal.setTime(date_end); return getDates(beginCal, endCal); } /** * ? * @param date_begin * @param date_end * @return */ public static List<Date> getDates(String date_begin, String date_end) { Calendar beginCal = Calendar.getInstance(); beginCal.setTime(parseDate(date_begin)); Calendar endCal = Calendar.getInstance(); endCal.setTime(parseDate(date_end)); return getDates(beginCal, endCal); } /** * ??? * @param date_begin * @param date_end * @return */ public static List<Date> getDates(Calendar date_begin, Calendar date_end) { List<Date> result = new ArrayList<Date>(); Calendar temp = date_begin; while (temp.before(date_end)) { result.add(temp.getTime()); temp.add(Calendar.DAY_OF_YEAR, 1); } return result; } }