// 用缺省时区和语言环境获得一个日历
public static synchronized Calendar getInstance()
// 用给定时区和缺省语言环境获得一个日历
public static synchronized Calendar getInstance(TimeZone zone)
// 用缺省时区和给定语言环境获得一个日历
public static synchronized Calendar getInstance(Locale aLocale)
// 用给的时区和给定语言环境获得一个日历
public static synchronized Calendar getInstance(TimeZone zone, Locale aLocale)

public class WorkCalendarHelper {private final static String[] WEEKS = {"星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日"};public static void main(String[] args) {// 使用Calendar的getInstance()取得一个Calendar的实例Calendar calendar = Calendar.getInstance();// 初始化 Calendar 对象，但并不必要，除非需要重置时间calendar.setTime(new Date());// 获取时间值System.out.println(calendar.getTime());// 显示年份System.out.println("年份为：" + calendar.get(Calendar.YEAR));//显示月份（Calendar 的 month 从 0 开始，也就是全年 12 个月由 0 ~ 11 进行表示。）System.out.println("月份为：" + (calendar.get(Calendar.MONTH) + 1));//日System.out.println("日期为：" + calendar.get(Calendar.DATE));//星期System.out.println("星期为：" + WEEKS[calendar.get(Calendar.DAY_OF_WEEK) - 1]);//System.out.println("日期为：" + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));// 某月第 N 天System.out.println("本月第 " + calendar.get(Calendar.DAY_OF_MONTH) + " 天");// 今年的第 N 天System.out.println("今年的第 " + calendar.get(Calendar.DAY_OF_YEAR) + " 天");// 获取上午跟下午System.out.println(calendar.get(Calendar.AM_PM) == 0 ? "上午" : "下午");//时System.out.println("时为：" + calendar.get(Calendar.HOUR));// 获取时，默认24小时制System.out.println("时为：" + calendar.get(Calendar.HOUR_OF_DAY));// 分System.out.println("分钟数为：" + calendar.get(Calendar.MINUTE));//秒System.out.println("秒为：" + calendar.get(Calendar.SECOND));//毫秒System.out.println("毫秒为：" + calendar.get(Calendar.MILLISECOND));System.out.println("月的周数：" + calendar.get(Calendar.WEEK_OF_MONTH));System.out.println("年的周数：" + calendar.get(Calendar.WEEK_OF_YEAR));System.out.println("历型为：" + calendar.get(Calendar.ERA));System.out.println("zone为：" + calendar.get(Calendar.ZONE_OFFSET));}
}

public static List<Map<String,Object>> initCalendar(int year) {List<Map<String,Object>> resultList = new ArrayList<>();Calendar calendar = Calendar.getInstance();int monthSum = 12;for (int i = 0; i < monthSum; i++) {calendar.set(year, i, 1);// 获取某月最小天数int monthMin = calendar.getActualMinimum(Calendar.DAY_OF_MONTH);// 获取某月最大天数int monthMax = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);Map<String,Object> workCalendar;String timeCode;for (int day = monthMin; day <= monthMax; day++) {workCalendar = new HashMap<String,Object>(4);calendar.set(year, i, day);if ((calendar.get(7) == 1) || (calendar.get(7) == 7)) {timeCode = "sys_weekend";} else {timeCode = "sys_workday";}// 工作时间编码workCalendar.put("timeCode",timeCode);// 年份workCalendar.put("year",year);// 月份workCalendar.put("month",(i+1));// 天workCalendar.put("day",day);resultList.add(workCalendar);}}return resultList;
}

/*** 获取当前月所有日期*/
public static List<Map<String, Object>> currentMonthDay() {List<Map<String, Object>> resultList = new ArrayList<>();//创建日历Calendar ca = Calendar.getInstance();//设置时间ca.setTime(new Date());//将时间调整到当前日历月份最后一天ca.set(ca.get(Calendar.YEAR), ca.get(Calendar.MONTH) + 1, 0);//获取当前日历月份的实际总天数int dayNumOfMonth = ca.get(Calendar.DAY_OF_MONTH);//将日历时间指向当前日历月份的一号ca.set(Calendar.DAY_OF_MONTH, 1);Map<String, Object> workCalendar;String timeCode;for (int i = 0; i < dayNumOfMonth; i++, ca.add(Calendar.DATE, 1)) {workCalendar = new HashMap<String, Object>(4);//设置为0时0分0秒0毫秒ca.set(Calendar.HOUR_OF_DAY, 0);ca.set(Calendar.MINUTE, 0);ca.set(Calendar.SECOND, 0);ca.set(Calendar.MILLISECOND, 0);if ((ca.get(7) == 1) || (ca.get(7) == 7)) {timeCode = "sys_weekend";} else {timeCode = "sys_workday";}// 工作时间编码workCalendar.put("timeCode", timeCode);// 年份workCalendar.put("year", ca.get(Calendar.YEAR));// 月份workCalendar.put("month", (ca.get(Calendar.MONTH) + 1));// 天workCalendar.put("day", ca.get(Calendar.DAY_OF_MONTH));resultList.add(workCalendar);}return resultList;
}

/*** 获取本周所有的日期,按时间先后排序*/
public static List<Map<String, Object>> currentMeekDay() {List<Map<String, Object>> resultList = new ArrayList<>();//创建日历Calendar ca = Calendar.getInstance();//设置时间ca.setTime(new Date());//设置周一为每周的第一天ca.setFirstDayOfWeek(Calendar.MONDAY);//将Calendar日期对象指向本周的周一ca.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);Map<String, Object> workCalendar;String timeCode;for (int i = 0; i < 7; i++, ca.add(Calendar.DATE, 1)) {workCalendar = new HashMap<String, Object>(4);//将日历时间调整为0时0分0秒ca.set(Calendar.HOUR_OF_DAY, 0);ca.set(Calendar.MINUTE, 0);ca.set(Calendar.SECOND, 0);ca.set(Calendar.MILLISECOND, 0);//将时间添加到list列表if ((ca.get(7) == 1) || (ca.get(7) == 7)) {timeCode = "sys_weekend";} else {timeCode = "sys_workday";}// 工作时间编码workCalendar.put("timeCode", timeCode);// 年份workCalendar.put("year", ca.get(Calendar.YEAR));// 月份workCalendar.put("month", (ca.get(Calendar.MONTH) + 1));// 天workCalendar.put("day", ca.get(Calendar.DAY_OF_MONTH));resultList.add(workCalendar);}return resultList;
}