Calendar类的使用api介绍

Calendar类的使用api介绍：

import java.text.DateFormat;import java.text.ParsePosition;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;public class CalendarUtil {private int weeks = 0;// 用来全局控制 上一周，本周，下一周的周数变化private int MaxDate; // 一月最大天数private int MaxYear; // 一年最大天数/** 获取明天的时刻 */public static Calendar getNextDay(Calendar calendar) {calendar.add(Calendar.DAY_OF_YEAR, +1);//calendar.set(Calendar.DAY_OF_MONTH,//Calendar.getInstance().get(Calendar.DAY_OF_MONTH)+1);return calendar;}public static void main(String[] args) {CalendarUtil tt = new CalendarUtil();Calendar ca=Calendar.getInstance();ca.setTimeInMillis(System.currentTimeMillis());Calendar  nextDay=getNextDay(getNextDay(ca));System.out.println("明天 的日期"+nextDay.get(Calendar.DAY_OF_MONTH));System.out.println("明天 的月份"+(nextDay.get(Calendar.MONTH)+1));System.out.println("获取当天日期:" + tt.getNowTime("yyyy-MM-dd"));System.out.println("获取本周一日期:" + tt.getMondayOFWeek());System.out.println("获取本周日的日期~:" + tt.getCurrentWeekday());System.out.println("获取上周一日期:" + tt.getPreviousWeekday());System.out.println("获取上周日日期:" + tt.getPreviousWeekSunday());System.out.println("获取下周一日期:" + tt.getNextMonday());System.out.println("获取下周日日期:" + tt.getNextSunday());System.out.println("获得相应周的周六的日期:" + tt.getNowTime("yyyy-MM-dd"));System.out.println("获取本月第一天日期:" + tt.getFirstDayOfMonth());System.out.println("获取本月最后一天日期:" + tt.getDefaultDay());System.out.println("获取上月第一天日期:" + tt.getPreviousMonthFirst());System.out.println("获取上月最后一天的日期:" + tt.getPreviousMonthEnd());System.out.println("获取下月第一天日期:" + tt.getNextMonthFirst());System.out.println("获取下月最后一天日期:" + tt.getNextMonthEnd());System.out.println("获取本年的第一天日期:" + tt.getCurrentYearFirst());System.out.println("获取本年最后一天日期:" + tt.getCurrentYearEnd());System.out.println("获取去年的第一天日期:" + tt.getPreviousYearFirst());System.out.println("获取去年的最后一天日期:" + tt.getPreviousYearEnd());System.out.println("获取明年第一天日期:" + tt.getNextYearFirst());System.out.println("获取明年最后一天日期:" + tt.getNextYearEnd());System.out.println("获取本季度第一天:" + tt.getThisSeasonFirstTime(11));System.out.println("获取本季度最后一天:" + tt.getThisSeasonFinallyTime(11));System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"+ CalendarUtil.getTwoDay("2008-12-1", "2008-9-29"));System.out.println("获取当前月的第几周：" + tt.getWeekOfMonth());System.out.println("获取当前年份：" + tt.getYear());System.out.println("获取当前月份：" + tt.getMonth());System.out.println("获取今天在本年的第几天：" + tt.getDayOfYear());System.out.println("获得今天在本月的第几天(获得当前日)：" + tt.getDayOfMonth());System.out.println("获得今天在本周的第几天：" + tt.getDayOfWeek());System.out.println("获得半年后的日期："+ tt.convertDateToString(tt.getTimeYearNext()));}public static int getYear() {return Calendar.getInstance().get(Calendar.YEAR);}public static int getMonth() {return Calendar.getInstance().get(Calendar.MONTH) + 1;}public static int getDayOfYear() {return Calendar.getInstance().get(Calendar.DAY_OF_YEAR);}public static int getDayOfMonth() {return Calendar.getInstance().get(Calendar.DAY_OF_MONTH);}public static int getDayOfWeek() {return Calendar.getInstance().get(Calendar.DAY_OF_WEEK);}public static int getWeekOfMonth() {return Calendar.getInstance().get(Calendar.DAY_OF_WEEK_IN_MONTH);}public static Date getTimeYearNext() {Calendar.getInstance().add(Calendar.DAY_OF_YEAR, 183);return Calendar.getInstance().getTime();}public static String convertDateToString(Date dateTime) {SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");return df.format(dateTime);}public static String getTwoDay(String sj1, String sj2) {SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");long day = 0;try {java.util.Date date = myFormatter.parse(sj1);java.util.Date mydate = myFormatter.parse(sj2);day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);} catch (Exception e) {return "";}return day + "";}public static String getWeek(String sdate) {// 再转换为时间Date date = CalendarUtil.strToDate(sdate);Calendar c = Calendar.getInstance();c.setTime(date);// int hour=c.get(Calendar.DAY_OF_WEEK);// hour中存的就是星期几了，其范围 1~7// 1=星期日 7=星期六，其他类推return new SimpleDateFormat("EEEE").format(c.getTime());}public static Date strToDate(String strDate) {SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");ParsePosition pos = new ParsePosition(0);Date strtodate = formatter.parse(strDate, pos);return strtodate;}public static long getDays(String date1, String date2) {if (date1 == null || date1.equals(""))return 0;if (date2 == null || date2.equals(""))return 0;// 转换为标准时间SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");java.util.Date date = null;java.util.Date mydate = null;try {date = myFormatter.parse(date1);mydate = myFormatter.parse(date2);} catch (Exception e) {}long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);return day;}public String getDefaultDay() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.set(Calendar.DATE, 1);// 设为当前月的1号lastDate.add(Calendar.MONTH, 1);// 加一个月，变为下月的1号lastDate.add(Calendar.DATE, -1);// 减去一天，变为当月最后一天str = sdf.format(lastDate.getTime());return str;}public String getPreviousMonthFirst() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.set(Calendar.DATE, 1);// 设为当前月的1号lastDate.add(Calendar.MONTH, -1);// 减一个月，变为下月的1号// lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天str = sdf.format(lastDate.getTime());return str;}public String getFirstDayOfMonth() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.set(Calendar.DATE, 1);// 设为当前月的1号str = sdf.format(lastDate.getTime());return str;}public String getCurrentWeekday() {weeks = 0;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 6);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}public String getNowTime(String dateformat) {Date now = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);// 可以方便地修改日期格式String hehe = dateFormat.format(now);return hehe;}private int getMondayPlus() {Calendar cd = Calendar.getInstance();// 获得今天是一周的第几天，星期日是第一天，星期二是第二天......int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 因为按中国礼拜一作为第一天所以这里减1if (dayOfWeek == 1) {return 0;} else {return 1 - dayOfWeek;}}public String getMondayOFWeek() {weeks = 0;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}public String getSaturday() {int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}public String getPreviousWeekSunday() {weeks = 0;weeks--;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + weeks);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}public String getPreviousWeekday() {weeks--;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}public String getNextMonday() {weeks++;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 7);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}public String getNextSunday() {int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 + 6);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}private int getMonthPlus() {Calendar cd = Calendar.getInstance();int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);cd.set(Calendar.DATE, 1);// 把日期设置为当月第一天cd.roll(Calendar.DATE, -1);// 日期回滚一天，也就是最后一天MaxDate = cd.get(Calendar.DATE);if (monthOfNumber == 1) {return -MaxDate;} else {return 1 - monthOfNumber;}}public String getPreviousMonthEnd() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.MONTH, -1);// 减一个月lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天str = sdf.format(lastDate.getTime());return str;}public String getNextMonthFirst() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.MONTH, 1);// 减一个月lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天str = sdf.format(lastDate.getTime());return str;}public String getNextMonthEnd() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.MONTH, 1);// 加一个月lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天str = sdf.format(lastDate.getTime());return str;}public String getNextYearEnd() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.YEAR, 1);// 加一个年lastDate.set(Calendar.DAY_OF_YEAR, 1);lastDate.roll(Calendar.DAY_OF_YEAR, -1);str = sdf.format(lastDate.getTime());return str;}public String getNextYearFirst() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.YEAR, 1);// 加一个年lastDate.set(Calendar.DAY_OF_YEAR, 1);str = sdf.format(lastDate.getTime());return str;}private int getMaxYear() {Calendar cd = Calendar.getInstance();cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。int MaxYear = cd.get(Calendar.DAY_OF_YEAR);return MaxYear;}private int getYearPlus() {Calendar cd = Calendar.getInstance();int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);// 获得当天是一年中的第几天cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。int MaxYear = cd.get(Calendar.DAY_OF_YEAR);if (yearOfNumber == 1) {return -MaxYear;} else {return 1 - yearOfNumber;}}public String getCurrentYearFirst() {int yearPlus = this.getYearPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, yearPlus);Date yearDay = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preYearDay = df.format(yearDay);return preYearDay;}// 获得本年最后一天的日期 *public String getCurrentYearEnd() {Date date = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式String years = dateFormat.format(date);return years + "-12-31";}// 获得上年第一天的日期 *public String getPreviousYearFirst() {Date date = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式String years = dateFormat.format(date);int years_value = Integer.parseInt(years);years_value--;return years_value + "-1-1";}// 获得上年最后一天的日期public String getPreviousYearEnd() {weeks--;int yearPlus = this.getYearPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, yearPlus + MaxYear * weeks+ (MaxYear - 1));Date yearDay = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preYearDay = df.format(yearDay);return preYearDay;}public String getThisSeasonFirstTime(int month) {int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };int season = 1;if (month >= 1 && month <= 3) {season = 1;}if (month >= 4 && month <= 6) {season = 2;}if (month >= 7 && month <= 9) {season = 3;}if (month >= 10 && month <= 12) {season = 4;}int start_month = array[season - 1][0];int end_month = array[season - 1][2];Date date = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式String years = dateFormat.format(date);int years_value = Integer.parseInt(years);int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);int end_days = getLastDayOfMonth(years_value, end_month);String seasonDate = years_value + "-" + start_month + "-" + start_days;return seasonDate;}public String getThisSeasonFinallyTime(int month) {int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };int season = 1;if (month >= 1 && month <= 3) {season = 1;}if (month >= 4 && month <= 6) {season = 2;}if (month >= 7 && month <= 9) {season = 3;}if (month >= 10 && month <= 12) {season = 4;}int start_month = array[season - 1][0];int end_month = array[season - 1][2];Date date = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式String years = dateFormat.format(date);int years_value = Integer.parseInt(years);int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);int end_days = getLastDayOfMonth(years_value, end_month);String seasonDate = years_value + "-" + end_month + "-" + end_days;return seasonDate;}private int getLastDayOfMonth(int year, int month) {if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8|| month == 10 || month == 12) {return 31;}if (month == 4 || month == 6 || month == 9 || month == 11) {return 30;}if (month == 2) {if (isLeapYear(year)) {return 29;} else {return 28;}}return 0;}public boolean isLeapYear(int year) {return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);}public boolean isLeapYear2(int year) {return new GregorianCalendar().isLeapYear(year);}}