- 此文仅对自己工作中用到的类进行总结,方便以后的使用。
类一:
package com.cn.hnust.util;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class DateUtil {
/**
* 获取起止日期
* @param sdf 需要显示的日期格式
* @param date 需要参照的日期
* @param n 最近n周
* @param option 0 开始日期;1 结束日期
* @param k 0 包含本周 1 不包含本周
* @return
*/
public static String getFromToDate(SimpleDateFormat sdf, Date date, int n, int option, int k) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1;
int offset = 0 == option ? 1 - dayOfWeek : 7 - dayOfWeek;
int amount = 0 == option ? offset - (n - 1 + k) * 7 : offset - k * 7;
calendar.add(Calendar.DATE, amount);
return sdf.format(calendar.getTime());
}
/**
* 根据当前日期获得最近n周的日期区间(包含本周)
* @param n
* @param sdf
* @return
*/
public static String getNWeekTimeInterval(int n, SimpleDateFormat sdf) {
String beginDate = getFromToDate(sdf, new Date(), n, 0, 0);
String endDate = getFromToDate(sdf, new Date(), n, 1, 0);
return beginDate + "," + endDate;
}
/**
* 根据当前日期获得最近n周的日期区间(不包含本周)
* @param n
* @param sdf
* @return
*/
public static String getNWeekTimeIntervalTwo(int n, SimpleDateFormat sdf) {
String beginDate = getFromToDate(sdf, new Date(), n, 0, 1);
String endDate = getFromToDate(sdf, new Date(), n, 1, 1);
return beginDate + "," + endDate;
}
/**
* 根据当前日期获得本周的日期区间(本周周一和周日日期)
* @param sdf
* @return
*/
public static String getThisWeekTimeInterval(SimpleDateFormat sdf) {
return getNWeekTimeInterval(1, sdf);
}
/**
* 根据当前日期获得上周的日期区间(上周周一和周日日期)
* @param sdf
* @return
*/
public static String getLastWeekTimeInterval(SimpleDateFormat sdf) {
return getNWeekTimeIntervalTwo(1, sdf);
}
public static void main(String[] args) {
System.out.println(getThisWeekTimeInterval(new SimpleDateFormat("yyyy-MM-dd HH:ss:mm"))); // 获得本周的日期区间
System.out.println(getLastWeekTimeInterval(new SimpleDateFormat("yyyy-MM-dd HH:ss:mm"))); // 获得上周的日期区间
}
}
类二:
/**
* Copyright © 2012-2016 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.cn.hnust.util;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.lang3.time.DateFormatUtils;
/**
* 日期工具类, 继承org.apache.commons.lang.time.DateUtils类
* @author ThinkGem
* @version 2014-4-15
*/
public class DateUtils extends org.apache.commons.lang3.time.DateUtils {
private static String[] parsePatterns = {
"yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM",
"yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm", "yyyy/MM",
"yyyy.MM.dd", "yyyy.MM.dd HH:mm:ss", "yyyy.MM.dd HH:mm", "yyyy.MM"};
/**
* 得到当前日期字符串 格式(yyyy-MM-dd)
*/
public static String getDate() {
return getDate("yyyy-MM-dd");
}
/**
* 得到当前日期字符串 格式(yyyy-MM-dd) pattern可以为:"yyyy-MM-dd" "HH:mm:ss" "E"
*/
public static String getDate(String pattern) {
return DateFormatUtils.format(new Date(), pattern);
}
/**
* 得到日期字符串 默认格式(yyyy-MM-dd) pattern可以为:"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;
}
/**
* 得到日期时间字符串,转换格式(yyyy-MM-dd HH:mm:ss)
*/
public static String formatDateTime(Date date) {
return formatDate(date, "yyyy-MM-dd HH:mm:ss");
}
/**
* 得到日期时间字符串,转换格式(yyyy年MM月dd日 HH:mm)
*/
public static String formatDate(Date date) {
return formatDate(date, "yyyy年MM月dd日 HH:mm");
}
/**
* 得到日期时间字符串,转换格式(MM月dd日)
* @param date
* @return
*/
public static String formatMonthAndDay(Date date){
return formatDate(date, "MM月dd日");
}
/**
* 得到当前时间字符串 格式(HH:mm:ss)
*/
public static String getTime() {
return formatDate(new Date(), "HH:mm:ss");
}
/**
* 得到当前日期和时间字符串 格式(yyyy-MM-dd HH:mm:ss)
*/
public static String getDateTime() {
return formatDate(new Date(), "yyyy-MM-dd HH:mm:ss");
}
/**
* 得到当前年份字符串 格式(yyyy)
*/
public static String getYear() {
return formatDate(new Date(), "yyyy");
}
/**
* 得到当前月份字符串 格式(MM)
*/
public static String getMonth() {
return formatDate(new Date(), "MM");
}
/**
* 得到当天字符串 格式(dd)
*/
public static String getDay() {
return formatDate(new Date(), "dd");
}
/**
* 得到当前星期字符串 格式(E)星期几
*/
public static String getWeek() {
return formatDate(new Date(), "E");
}
/**
* 日期型字符串转化为日期 格式
* { "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", "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;
}
}
public static Date parseDate(String str) {
if (str == null){
return null;
}
try {
return parseDate(str, parsePatterns);
} catch (ParseException e) {
return null;
}
}
/**
* 获取过去的天数
* @param date
* @return
*/
public static long pastDays(Date date) {
long t = new Date().getTime()-date.getTime();
return t/(24*60*60*1000);
}
/**
* 获取过去的小时
* @param date
* @return
*/
public static long pastHour(Date date) {
long t = new Date().getTime()-date.getTime();
return t/(60*60*1000);
}
/**
* 获取过去的分钟
* @param date
* @return
*/
public static long pastMinutes(Date date) {
long t = new Date().getTime()-date.getTime();
return t/(60*1000);
}
/**
* 转换为时间(天,时:分:秒.毫秒)
* @param timeMillis
* @return
*/
public static String formatDateTime(long timeMillis){
long day = timeMillis/(24*60*60*1000);
long hour = (timeMillis/(60*60*1000)-day*24);
long min = ((timeMillis/(60*1000))-day*24*60-hour*60);
long s = (timeMillis/1000-day*24*60*60-hour*60*60-min*60);
long sss = (timeMillis-day*24*60*60*1000-hour*60*60*1000-min*60*1000-s*1000);
return (day>0?day+",":"")+hour+":"+min+":"+s+"."+sss;
}
/**
* 获取两个日期之间的天数
*
* @param before
* @param after
* @return
*/
public static double getDistanceOfTwoDate(Date before, Date after) {
long beforeTime = before.getTime();
long afterTime = after.getTime();
return (afterTime - beforeTime) / (1000 * 60 * 60 * 24);
}
/**
* 天数增加
*/
public static Date dateAdd(Date ptime,Integer day){
String str = DatetoString(ptime, "yyyy-MM-dd");
Date date = StringToDate(str, "yyyy-MM-dd");
Calendar ca = Calendar.getInstance();
ca.setTime(date);
ca.add(Calendar.DATE, day);// day为增加的天数,可以改变的
date = ca.getTime();
return date;
}
/**
* 日期增加(带时分秒)
*/
public static Date dateAddHms(Date ptime,Integer day){
String str = DatetoString(ptime, "yyyy-MM-dd HH:mm:ss");
Date date = StringToDate(str, "yyyy-MM-dd HH:mm:ss");
Calendar ca = Calendar.getInstance();
ca.setTime(date);
ca.add(Calendar.DATE, day);// day为增加的天数,可以改变的
date = ca.getTime();
return date;
}
/**
* 小时增加
*/
public static Date hourAdd(Date ptime,Integer hour){
String str = DatetoString(ptime, "yyyy-MM-dd HH:mm:ss");
Date date = StringToDate(str, "yyyy-MM-dd HH:mm:ss");
Calendar ca = Calendar.getInstance();
ca.setTime(date);
ca.add(Calendar.HOUR, hour);// hour为增加的小时,可以改变的
date = ca.getTime();
return date;
}
/**
* 获取特定时间的后一天凌晨0点的date
*
*/
public static Date dateAddFormatYmdhms(Date ptime,Integer day){
Date date=dateAdd(ptime,day);
return dateymdhms(date);
}
/**
* date转String
* @param date
* @return
*/
public static String DatetoString(Date date,String ymd){
SimpleDateFormat sdf = new SimpleDateFormat(ymd);
String str = sdf.format(date);
return str;
}
/**
* String 转date
* @param str
* @param ymd
* @return
*/
public static Date StringToDate(String str,String ymd){
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat(ymd);
try {
date = sdf.parse(str);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return date;
}
public static Date dateymd(Date ptime){
String str = DatetoString(ptime,"yyyy-MM-dd");
Date date = StringToDate(str, "yyyy-MM-dd");
return date;
}
public static Date dateymdhms(Date ptime){
String str = DatetoString(ptime,"yyyy-MM-dd HH:mm:ss");
Date date = StringToDate(str, "yyyy-MM-dd HH:mm:ss");
return date;
}
public static Date getDateymd(){
Date ptime=new Date();
String str = DatetoString(ptime,"yyyy-MM-dd");
Date date = StringToDate(str, "yyyy-MM-dd");
return date;
}
public static Date getDateymdhms(){
Date ptime=new Date();
String str = DatetoString(ptime,"yyyy-MM-dd HH:mm:ss");
Date date = StringToDate(str, "yyyy-MM-dd HH:mm:ss");
return date;
}
/**
* @param args
* @throws ParseException
*/
public static void main(String[] args) throws ParseException {
// System.out.println(formatDate(parseDate("2010/3/6")));
// System.out.println(getDate("yyyy年MM月dd日 E"));
// long time = new Date().getTime()-parseDate("2012-11-19").getTime();
// System.out.println(time/(24*60*60*1000));
}
/**
* 获取某个月的第一天与最后一天
* @param date
* @return
*/
public static Map<String, String> getDayOfMonth(Date date) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.MONTH, 0);
Date theDate = calendar.getTime();
//第一天
GregorianCalendar gcLast = (GregorianCalendar) Calendar.getInstance();
gcLast.setTime(theDate);
gcLast.set(Calendar.DAY_OF_MONTH, 1);
String day_first = df.format(gcLast.getTime());
StringBuffer str = new StringBuffer().append(day_first).append(" 00:00:00");
day_first = str.toString();
//最后一天
calendar.add(Calendar.MONTH, 1); //加一个月
calendar.set(Calendar.DATE, 1); //设置为该月第一天
calendar.add(Calendar.DATE, -1); //再减一天即为上个月最后一天
String day_last = df.format(calendar.getTime());
StringBuffer endStr = new StringBuffer().append(day_last).append(" 23:59:59");
day_last = endStr.toString();
Map<String, String> map = new HashMap<String, String>();
map.put("first", day_first);
map.put("last", day_last);
return map;
}
/**
* 获取某个星期的第一天与最后一天(第一天为周一 最后一天为周日)
* @param date
* @return
*/
public static Map<String, String> getDayOfWeek(Date date) {
Map<String, String> map = new HashMap<String, String>();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
try {
cal.setTime(date);
cal.set(Calendar.DAY_OF_WEEK, 2);
} catch (Exception e) {
e.printStackTrace();
}
Date theDate = cal.getTime();
String day_first = df.format(theDate);
StringBuffer str = new StringBuffer().append(day_first).append(" 00:00:00");
day_first = str.toString();
map.put("first", day_first);
cal = Calendar.getInstance();
try {
cal.setTime(date);
cal.set(Calendar.DAY_OF_WEEK, 1);
cal.set(Calendar.DATE, cal.get(Calendar.DATE) + 7);
} catch(Exception e) {
e.printStackTrace();
}
theDate = cal.getTime();
String day_last = df.format(theDate);
str = new StringBuffer().append(day_last).append(" 23:59:59");
day_last = str.toString();
map.put("last", day_last);
return map;
}
}
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