Java tutorial
/** * Copyright © 2012-2013 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved. * <p/> * Licensed under the Apache License, Version 2.0 (the "License"); */ package com.qdum.llhb.common.utils; import java.text.ParseException; import java.util.Calendar; import java.util.Date; import java.util.List; import org.apache.commons.lang.time.DateFormatUtils; import com.jfinal.plugin.activerecord.Record; /** * , 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"); } /** * ? ?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; } /** * ? ?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); } /** * * * @param date1 * @param date2 * @return */ public static long pastMinutes(Date date1, Date date2) { long t = date1.getTime() - date2.getTime(); return t / (60 * 1000); } /** * @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)); } /** * ? * * @param d * @param day * @return */ public static Date getDateBefore(Date d, int day) { Calendar now = Calendar.getInstance(); now.setTime(d); now.set(Calendar.DATE, now.get(Calendar.DATE) - day); return now.getTime(); } /** * getMonthFirstDay??:?? * * @author yaoyt * @time 15/12/29 ?1:19 */ public static Date getMonthFirstDay() { Calendar c = Calendar.getInstance(); c.add(Calendar.MONTH, 0); c.set(Calendar.DAY_OF_MONTH, 1);//1?,? return c.getTime(); } /** * getMonthLastDay??:??? * * @author yaoyt * @time 15/12/29 ?1:21 */ public static Date getMonthLastDay() { Calendar c = Calendar.getInstance(); c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH)); return c.getTime(); } /** * ?? * * @param date1 * @param date2 * @return */ public static Boolean isSameWeek(Date date1, Date date2) { Calendar c = Calendar.getInstance(); c.setTime(date1); Calendar c2 = Calendar.getInstance(); c2.setTime(date2); int week1 = c.get(Calendar.WEEK_OF_YEAR); int week2 = c2.get(Calendar.WEEK_OF_YEAR); if (week1 == week2) { return Boolean.TRUE; } else { return Boolean.FALSE; } } /** * ?? * * @return */ public static Boolean isSameMonth(Date date1, Date date2) { Calendar c = Calendar.getInstance(); c.setTime(date1); Calendar c2 = Calendar.getInstance(); c2.setTime(date2); int month = c.get(Calendar.MONTH); int month2 = c2.get(Calendar.MONTH); if (month == month2) { return Boolean.TRUE; } else { return Boolean.FALSE; } } /** * ? * @author zhaoyl * @param Datedate-- ? * @time 20161610:05:06 * */ public String setPastTime(Date date) { long pastTime = new Date().getTime() - date.getTime();// if (pastTime < 24 * 3600 * 1000) {//? if (pastTime < 3600 * 1000) { if (pastTime < 60 * 1000) { return ""; } else { return (pastTime / (60 * 1000)) + "?"; } } else { return (pastTime / (3600 * 1000)) + "??"; } } else { return (pastTime / (24 * 3600 * 1000)) + "?"; } } /** * ? * * @param d * @param day * @return */ public static String getDateAfter(int day) { Calendar now = Calendar.getInstance(); now.set(Calendar.DATE, now.get(Calendar.DATE) + day); return formatDate(now.getTime(), "yyyy-MM-dd HH:mm:ss"); } }