java开发中时间按工具类

import java.io.*;
import java.text.*;
import java.util.*;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtils {
? public DateUtils() {
? }

? public final static Calendar myc = Calendar.getInstance();

? public static final int SECOND = 1000;
? public static final int MINUTE = SECOND * 60;
? public static final int HOUR = MINUTE * 60;
? public static final int DAY = HOUR * 24;
? public static final int WEEK = DAY * 7;
? public static final int YEAR = DAY * 365; // or 366 ???

? public static final long GMT_VIETNAM_TIME_OFFSET = HOUR * 8;

? private static long SERVER_TIME_OFFSET = HOUR * 0;

? private static DateFormat ddMMyyyyFormat = new SimpleDateFormat("dd/MM/yyyy");
? private static DateFormat yyyymmddhhmmssFormat = new SimpleDateFormat(
????? "yyyy年MM月dd日 kk:mm:ss");
? private static DateFormat mmddhhmmFormat = new SimpleDateFormat(
????? "MM月dd日 kk:mm");
? private static DateFormat yyyymmddhhmmFormat = new SimpleDateFormat(
????? "yyyy年MM月dd日 kk:mm");
? private static DateFormat dateFormat = SimpleDateFormat.getDateInstance(
????? SimpleDateFormat.DEFAULT);
? private static DateFormat datetimeFormat = SimpleDateFormat.
????? getDateTimeInstance(SimpleDateFormat.DEFAULT, SimpleDateFormat.DEFAULT);

? /**
?? * @return 返回当前时间，返回格式：2003-4-25 14:50:7
?? */
? public static String getTime() {
??? return getTime("yyyy-MM-dd HH:mm:ss");
? }

? public static Date getDate(String parrten) {
??? if (!StringUtils.hasText(parrten)) {
????? parrten = "yyyyMMddHH";
??? }
??? String starttime = DateUtils.getTime(parrten);
??? return DateUtils.getStrToDate(starttime, parrten);
? }
?
? public static Date getDate(){
?? return getDate("yyyy-MM-dd HH:mm:ss");
? }

? /**
?? * 获得当前时间
?? * @param parrten 输出的时间格式
?? * @return 返回时间
?? */
? public static String getTime(String parrten) {
??? String timestr;
??? if (parrten == null || parrten.equals("")) {
????? parrten = "yyyyMMddHHmmss";
??? }
??? java.text.SimpleDateFormat sdf = new SimpleDateFormat(parrten);
??? java.util.Date cday = new Date();
??? timestr = sdf.format(cday);
??? return timestr;
? }

? /**
?? * 时间格式转换
?? * @param cday
?? * @param parrten
?? * @return
?? */
? public static String getTime(Date cday, String parrten) {
??? String timestr;
??? if (parrten == null || parrten.equals("")) {
????? parrten = "yyyyMMddHHmmss";
??? }
??? java.text.SimpleDateFormat sdf = new SimpleDateFormat(parrten);
??? timestr = sdf.format(cday);
??? return timestr;
? }

? /**
?? * 得到昨天的时间
?? * @return
?? */
? public static String getYestday() {
??? String timestr;
??? java.util.Calendar cc = myc;
??? cc.roll(cc.DAY_OF_YEAR, -1);
??? java.text.SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
??? timestr = sdf.format(cc.getTime());
??? return timestr;
? }

? //将一个时间字符串转换为date型
? public static Date getStrToDate(String time, String parrten) {
??? SimpleDateFormat formatter = new SimpleDateFormat(parrten);
??? ParsePosition pos = new ParsePosition(0);
??? Date dt1 = formatter.parse(time, pos);
??? return dt1;
? }

? /**
?? * 将时间转换为xxxx年xx月xx日格式
?? * @param t1 原时间
?? * @param parrten 原时间格式
?? * @return
?? */
? public static String getTime(String t1, String parrten) {
??? SimpleDateFormat formatter = new SimpleDateFormat(parrten);
??? SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy年MM月dd日");
??? ParsePosition pos = new ParsePosition(0);
??? Date dt1 = formatter.parse(t1, pos);
??? return formatter2.format(dt1);
? }

? /**
?? * 将时间转换为parrten2格式
?? * @param t1
?? * @param parrten
?? * @param parrten2
?? * @return
?? */
? public static String getTime(String t1, String parrten, String parrten2) {
??? SimpleDateFormat formatter = new SimpleDateFormat(parrten);
??? SimpleDateFormat formatter2 = new SimpleDateFormat(parrten2);
??? ParsePosition pos = new ParsePosition(0);
??? Date dt1 = formatter.parse(t1, pos);
??? return formatter2.format(dt1);
? }

? /**
?? * 比较两个字符串时间的大小
?? * @param t1 时间1
?? * @param t2 时间2
?? * @param parrten 时间格式 :yyyy-MM-dd
?? * @return 返回long =0相等，>0 t1>t2，<0 t1<t2
?? */
? public static long compareStringTime(String t1, String t2, String parrten) {
??? SimpleDateFormat formatter = new SimpleDateFormat(parrten);
??? ParsePosition pos = new ParsePosition(0);
??? ParsePosition pos1 = new ParsePosition(0);
??? Date dt1 = formatter.parse(t1, pos);
??? Date dt2 = formatter.parse(t2, pos1);
??? long l = dt1.getTime() - dt2.getTime();
??? return l;
? }

? //相差的天数
? public static int compareTime(String time1, String time2) {
??? long l = compareStringTime(time1, time2, "yyyy-MM-dd");
??? long days = l / 1000 / 60 / 60 / 24;
??? return (int) days;
? }

? public static synchronized String getDateDDMMYYYY(Date date) {
??? return ddMMyyyyFormat.format(date);
? }

? public static synchronized String getDateindex(Date date) {
??? return yyyymmddhhmmssFormat.format(date);
? }

? public static synchronized String getDateSearch(Date date) {
??? return mmddhhmmFormat.format(date);
? }

? public static synchronized String getDateNoSencond(Date date) {
??? return yyyymmddhhmmFormat.format(date);
? }

? public static synchronized String formatDate(Date date) {
??? return dateFormat.format(date);
? }

? public static synchronized String formatDateTime(Date date) {
??? return datetimeFormat.format(date);
? }

? public static Timestamp getCurrentGMTTimestamp() {
??? return new Timestamp(System.currentTimeMillis() - SERVER_TIME_OFFSET);
? }

? public static void updateCurrentGMTTimestamp(Timestamp timeToUpdate) {
??? timeToUpdate.setTime(System.currentTimeMillis() - SERVER_TIME_OFFSET);
? }

? public static Date getVietnamDateFromGMTDate(Date date) {
??? return new Date(date.getTime() + GMT_VIETNAM_TIME_OFFSET);
? }

? public static Date convertGMTDate(Date gmtDate, int hourOffset) {
??? return new Date(gmtDate.getTime() + hourOffset * HOUR);
? }

? public static Timestamp convertGMTTimestamp(Timestamp gmtTimestamp,
????????????????????????????????????????????? int hourOffset) {
??? return new Timestamp(gmtTimestamp.getTime() + hourOffset * HOUR);
? }

? public static Timestamp getCurrentGMTTimestampExpiredYear(int offsetYear) {
??? //return new Timestamp(System.currentTimeMillis() + offsetYear*(365*24*60*60*1000));
??? Calendar now = Calendar.getInstance();
??? now.add(Calendar.YEAR, offsetYear);
??? return new Timestamp(now.getTime().getTime());
? }

? public static Timestamp getCurrentGMTTimestampExpiredMonth(int offsetMonth) {
??? Calendar now = Calendar.getInstance();
??? now.add(Calendar.MONTH, offsetMonth);
??? return new Timestamp(now.getTime().getTime());
? }

? /**
?? * 在当前的日期前加上N天
?? * @param day int 天数
?? * @return Date
?? */
? public static Date addDay(int day) {
??? java.util.Date date1 = new Date();
??? long Time = (date1.getTime() / 1000) + 60 * 60 * 24 * day;
??? date1.setTime(Time * 1000);
??? return date1;
? }

? /**
?? * 计算两个时间之间的天数
?? * @param d1 Date
?? * @param d2 Date
?? * @return long
?? */
? public static long getDaysFromTwoDate(Date d1, Date d2) {
??? long day = (d1.getTime() - d2.getTime()) / (24 * 60 * 60 * 1000);
??? return day;
? }

? public static Date getLastSunday() {
??? String sdate = getTime("yyyy-MM-dd");
??? int syear = Integer.parseInt(sdate.substring(0, 4));
??? int smonth = Integer.parseInt(sdate.substring(5, 7));
??? int sday = Integer.parseInt(sdate.substring(8, 10));
??? GregorianCalendar cal = new GregorianCalendar();
??? cal.set(syear, smonth, sday);
??? int week = cal.get(java.util.Calendar.DAY_OF_WEEK); //1为星期天
??? return addDay( - (week + 6));
? }

? public static Date getLastSaturday() {
??? String sdate = getTime("yyyy-MM-dd");
??? int syear = Integer.parseInt(sdate.substring(0, 4));
??? int smonth = Integer.parseInt(sdate.substring(5, 7));
??? int sday = Integer.parseInt(sdate.substring(8, 10));
??? GregorianCalendar cal = new GregorianCalendar();
??? cal.set(syear, smonth, sday);
??? int week = cal.get(java.util.Calendar.DAY_OF_WEEK); //1为星期天
??? return addDay( - (week));
? }

? public static String getlastMonth() {
??? String sdate = getTime("yyyy-MM-dd");
??? int syear = Integer.parseInt(sdate.substring(0, 4));
??? int smonth = Integer.parseInt(sdate.substring(5, 7));
??? smonth = smonth - 1;
??? if (smonth == 0) {
????? smonth = 12;
????? syear = syear - 1;
??? }
??? return syear + "-" + smonth + "-01";
? }

? public static String getThisMonthStart() {
??? String sdate = getTime("yyyy-MM-dd");
??? int syear = Integer.parseInt(sdate.substring(0, 4));
??? int smonth = Integer.parseInt(sdate.substring(5, 7));
??? return syear + "-" + smonth + "-01";
? }

? /**
?? * 当日属于一年的第几周
?? * @return int
?? */
? public static int getWeekOfYeah() {
??? Calendar calendar = Calendar.getInstance();
???
??? int week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
??? return week;
? }

? /**
?? * 得到一个星期的开始
?? * @return Date
?? */
? public static Date weekStart() {
??? Date date = new Date();
??? Calendar calendar = Calendar.getInstance();
??? int week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
??? Date dateBegin = new Date();
??? dateBegin.setTime(date.getTime() - (long) (week) * 24 * 60 * 60 * 1000);
??? return dateBegin;
? }

? /**
?? * 得到一个星期的结束
?? * @return Date
?? */
? public static Date weekEnd() {
??? Date date = new Date();
??? Calendar calendar = Calendar.getInstance();
??? int week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
??? Date dateEnd = new Date();
??? dateEnd.setTime(date.getTime() + (long) (6 - week) * 24 * 60 * 60 * 1000);
??? return dateEnd;
? }

? /**
?? * 得到某年第n个星期的星期天
?? * @param year int
?? * @param week int
?? * @return Date
?? */
? public static Date getDateByYearAndWeekstart(int year, int week) { //星期日。第一天
??? Calendar calendar = Calendar.getInstance();
??? calendar.set(Calendar.YEAR, year);
??? calendar.set(Calendar.WEEK_OF_YEAR, week);
??? calendar.set(Calendar.DAY_OF_WEEK, 1);
??? return calendar.getTime();
? }

? public static String getQuarter(String month) {
????? if (!StringUtils.hasText(month) && !StringUtils.isNumeric(month)) {
????????? month = "1";
????? }
????? int m = Integer.parseInt(month);
????? if (m <= 12 && m >= 10) {
????????? return "4";
????? } else if (m <= 9 && m >= 7) {
????????? return "3";
????? } else if (m <= 6 && m >= 4) {
????????? return "2";
????? } else {
????????? return "1";
????? }
? }

? public static String getQuarter(){
????? String month=getTime("M");
????? return getQuarter(month);
? }

? public static String getQuarterCn(){
????? String month=getTime("M");
????? return getQuarterCn(month);
? }

? public static String getQuarterCn(String month) {
????? if (!StringUtils.hasText(month) && !StringUtils.isNumeric(month)) {
????????? month = "1";
????? }
????? int m = Integer.parseInt(month);
????? if (m <= 12 && m >= 10) {
????????? return "四";
????? } else if (m <= 9 && m >= 7) {
????????? return "三";
????? } else if (m <= 6 && m >= 4) {
????????? return "二";
????? } else {
????????? return "一";
????? }
? }

? /**
?? * 得到某年第n个星期的星期六
?? * @param year int
?? * @param week int
?? * @return Date
?? */
? public static Date getDateByYearAndWeekend(int year, int week) { //星期六。最后一天
??? Calendar calendar = Calendar.getInstance();
??? calendar.set(Calendar.YEAR, year);
??? calendar.set(Calendar.WEEK_OF_YEAR, week);
??? calendar.set(Calendar.DAY_OF_WEEK, 0);
??? return calendar.getTime();
? }

? public static void main(String args[]) {
?? String stime="2007-08-24";
?? String etime="2007-08-28";
?? //System.out.println(DateUtils.compareTime(etime,stime));
?? //System.out.println(DateUtils.getTime("M"));
?? Float a=Float.valueOf("1");
?? Float b=Float.valueOf("1.9");
? }

}