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.sanyanyu.syybi.utils; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.List; import org.apache.commons.lang.time.DateFormatUtils; /** * , 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" }; /** * ? ?yyyy-MM-dd */ public static String getDate() { return getDate("yyyy-MM-dd"); } public static String getCurMonth() { return getDate("yyyy-MM"); } public static String getLastMonthDate() { return getOffsetMonth(-1, "yyyy-MM") + "-01"; } /** * ? ?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 HH:mm:ss */ public static String formatDateTime(Date date) { return formatDate(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 String getWeek() { return formatDate(new Date(), "E"); } /** * ? { "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; } /** * @Title:getDaysListBetweenDates * @Description: . * @param begin * . * @param end * ? . * @return * @return List<String> */ public static List<String> getDaysListBetweenDates(String begin, String end) { List<String> dateList = new ArrayList<String>(); Date d1; Date d2; d1 = DateUtils.parseDate(begin); d2 = DateUtils.parseDate(end); if (d1.compareTo(d2) > 0) { return dateList; } do { dateList.add(DateFormatUtils.format(d1, "yyyy-MM-dd")); d1 = DateUtils.addDays(d1, 1); } while (d1.compareTo(d2) <= 0); return dateList; } /** * ? * @param begin * @param end * @return */ public static List<String> getMonthListBetweenDates(String begin, String end) { //? if (StringUtils.isNotBlank(begin) && begin.indexOf("-") > -1 && begin.length() == 7 && StringUtils.isNotBlank(end) && end.indexOf("-") > -1 && end.length() == 7) { List<String> monthList = new ArrayList<String>(); Date d1 = DateUtils.parseDate(begin + "-01"); Date d2 = DateUtils.parseDate(end + "-01"); if (d1.compareTo(d2) > 0) { return null; } do { monthList.add(DateFormatUtils.format(d1, "yyyy-MM")); d1 = DateUtils.addMonths(d1, 1); } while (d1.compareTo(d2) <= 0); return monthList; } return null; } /** * @Title:getOffsetDate * @Description: ????X * @param offset * @return * @return String */ public static String getOffsetDate(int offset) { Calendar cal = Calendar.getInstance(); cal.add(Calendar.DAY_OF_MONTH, offset); String currentDate = DateFormatUtils.format(cal, "yyyy-MM-dd"); return currentDate; } public static String getOffsetMonth(int offset) { return getOffsetMonth(offset, "yyyyMM"); } public static String getOffsetMonth(int offset, String pattern) { Calendar cal = Calendar.getInstance(); cal.add(Calendar.MONTH, offset); String currentDate = DateFormatUtils.format(cal, pattern); return currentDate; } /** * @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)); // Date curDate = new Date(); // // Date validEndDate = DateUtils.parseDate("2015-04-30"); // Date beyondDate = DateUtils.addDays(validEndDate, 1); // // if(DateUtils.isSameDay(curDate, beyondDate)){ // System.out.println("aaa"); // // } // // System.out.println(getOffsetDate(-30)); // System.out.println(getDaysListBetweenDates(getOffsetDate(-30), getDate())); System.out.println(DateUtils.formatDate(new Date(System.currentTimeMillis()), "yyyyMMddHHmmssSSS")); System.out.println(getOffsetMonth(-1)); System.out.println(getMonthListBetweenDates("2015-07", "2015-03")); } }