时间工具类FormatCalendar

package com.yaojack.core.utils.transformat;

import java.util.Calendar;
import java.util.Date;

/**
 * Calendar相关操作
 * 注：请用该类中getCalendarNow方法获取系统当前时间
 * 
 * @module 格式化
 * @author YuJJ
 */
public class FormatCalendar {

	/**
	 * 获取系统当前日期时间
	 * 
	 * @return Calendar
	 * @author YuJJ
	 */
	public static Calendar getCalendarNow() {
		return Calendar.getInstance();
	}

	/**
	 * Date转Calendar
	 * 
	 * @param date
	 *            指定日期
	 * @return Calendar
	 * @author YuJJ
	 */
	public static Calendar getCalendar(Date date) {
		if (date == null) {
			return null;
		}
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar;
	}

	/**
	 * 计算结束时间减去开始时间的差值
	 * 
	 * @param start
	 *            开始时间
	 * @param end
	 *            结束时间
	 * @param type
	 *            1：返回毫秒数，2：返回秒数，3：返回分钟数，4：返回小时数，5：返回天数
	 * @return Long
	 * @author YuJJ
	 */
	public static Long getMillisDif(Date start, Date end, int type) {
		if (start == null || end == null) {
			return null;
		}
		// Long dif = end.getTime() - start.getTime();
		Long dif = end.getTime() / 1000 - start.getTime() / 1000;
		dif = dif * 1000;
		switch (type) {
		case 1:
			return dif;
		case 2:
			return dif / 1000;
		case 3:
			return dif / 60000;
		case 4:
			return dif / 3600000;
		case 5:
			return dif / (24 * 3600000);
		default:
			return null;
		}
	}

	/**
	 * 根据cycleType和dateType获取该周期单位上的开始或结束时间
	 * 
	 * @param date
	 * @param cycleType
	 *            1：年，2：月，3：日，4：周，5：季，6：小时
	 * @param dateType
	 *            1：开始时间，2：结束时间
	 * @return Date 例如：2014-04-01 00:00:00 或者 2014-04-30 23:59:59
	 * @author YuJJ
	 */
	public static Date getTimeByCycle(Date date, int cycleType, int dateType) {
		if (date == null) {
			return null;
		}
		Calendar calendar = getCalendar(date);
		int year = calendar.get(Calendar.YEAR), month;
		switch (cycleType) {
		case 1:
			if (dateType == 1) {
				calendar.set(year, 0, 1, 0, 0, 0);
			} else if (dateType == 2) {
				calendar.set(year + 1, 0, 1, 0, 0, -1);
			} else {
				return null;
			}
			break;
		case 2:
			month = calendar.get(Calendar.MONTH);
			if (dateType == 1) {
				calendar.set(year, month, 1, 0, 0, 0);
			} else if (dateType == 2) {
				calendar.set(year, month + 1, 1, 0, 0, -1);
			} else {
				return null;
			}
			break;
		case 3:
			month = calendar.get(Calendar.MONTH);
			int day = calendar.get(Calendar.DAY_OF_MONTH);
			if (dateType == 1) {
				calendar.set(year, month, day, 0, 0, 0);
			} else if (dateType == 2) {
				calendar.set(year, month, day + 1, 0, 0, -1);
			} else {
				return null;
			}
			break;
		case 4:
			int week = calendar.get(Calendar.DAY_OF_WEEK);
			if (dateType == 1) {
				calendar.add(Calendar.DATE, -((week + 5) % 7));
				return getTimeByCycle(calendar.getTime(), 3, 1);
			} else if (dateType == 2) {
				// calendar.add(Calendar.DATE, 6 - ((week + 5) % 7));
				calendar.add(Calendar.DATE, (8 - week) % 7);
				return getTimeByCycle(calendar.getTime(), 3, 2);
			} else {
				return null;
			}
		case 5:
			month = calendar.get(Calendar.MONTH);
			// calendar.set(Calendar.DATE, 1);
			if (dateType == 1) {
				calendar.add(Calendar.MONTH, -(month % 3));
				// calendar.set(Calendar.MONTH, (month / 3) * 3);
				return getTimeByCycle(calendar.getTime(), 2, 1);
			} else if (dateType == 2) {
				calendar.add(Calendar.MONTH, 3 - (month % 3));
				// calendar.set(Calendar.MONTH, (month / 3) * 3 + 2);
				return getTimeByCycle(calendar.getTime(), 2, 2);
			} else {
				return null;
			}
		case 6:
			month = calendar.get(Calendar.MONTH);
			int day_ = calendar.get(Calendar.DAY_OF_MONTH);
			int hour = calendar.get(Calendar.HOUR_OF_DAY);
			if (dateType == 1) {
				calendar.set(year, month, day_, hour, 0, 0);
			} else if (dateType == 2) {
				calendar.set(year, month, day_, hour + 1, 0, -1);
			} else {
				return null;
			}
			break;
		default:
			return null;
		}
		return calendar.getTime();
	}

	/**
	 * 计算个数
	 * 
	 * @param date
	 *            指定的日期
	 * @param type
	 *            11：date所在年的总天数， 12：date所有在月的总天数， 21：date的月份数-1，
	 *            22：date的日期天数-1。
	 * @return Integer
	 * @author YuJJ
	 */
	public static Integer getDayCount(Date date, int type) {
		if (date == null) {
			return null;
		}
		Calendar calendar = getCalendar(date);
		int year = calendar.get(Calendar.YEAR);
		int month = calendar.get(Calendar.MONTH);
		int day = calendar.get(Calendar.DAY_OF_MONTH);
		switch (type) {
		case 11:
			calendar.set(year + 1, 0, 0, 0, 0, 0);
			return calendar.get(Calendar.DAY_OF_YEAR);
		case 12:
			calendar.set(year, month + 1, 0, 0, 0, 0);
			return calendar.get(Calendar.DAY_OF_MONTH);
		case 21:
			return month - 1;
		case 22:
			return day - 1;
		}
		return null;
	}

	/**
	 * 根据参数条件改变时间
	 * 
	 * @param date
	 *            初始时间
	 * @param cycleType
	 *            改变周期，1：秒，2：分，3：时，4：日，5：月，6：年
	 * @param value
	 *            改变量，负数：向过去偏移，正数：向未来偏移
	 * @return Date
	 * @author YuJJ
	 */
	public static Date offsetTime(Date date, int cycleType, int value) {
		if (date == null) {
			return null;
		}
		Calendar calendar = getCalendar(date);
		int field;
		switch (cycleType) {
		case 1:
			field = Calendar.SECOND;
			break;
		case 2:
			field = Calendar.MINUTE;
			break;
		case 3:
			field = Calendar.HOUR_OF_DAY;
			break;
		case 4:
			field = Calendar.DAY_OF_MONTH;
			break;
		case 5:
			field = Calendar.MONTH;
			break;
		case 6:
			field = Calendar.YEAR;
			break;
		default:
			return null;
		}
		calendar.add(field, value);
		return calendar.getTime();
	}

	/**
	 * 获取毫秒数
	 * 
	 * @param date
	 *            指定时间
	 * @param type
	 *            1：获取参数时间到当月第一天零点的毫秒数，2：获取参数时间月份，整月的毫秒数，3：获取参数时间到当年第一天零点的毫秒数，4：
	 *            获取参数时间年份，整年的毫秒数
	 * @return Long
	 * @author YuJJ
	 */
	public static Long getMillis(Date date, int type) {
		if (date == null) {
			return null;
		}
		Date start = null, end = null;
		switch (type) {
		case 1:
			start = getTimeByCycle(date, 2, 1);
			end = date;
			break;
		case 2:
			start = getTimeByCycle(date, 2, 1);
			end = getTimeByCycle(date, 2, 2);
			break;
		case 3:
			start = getTimeByCycle(date, 1, 1);
			end = date;
			break;
		case 4:
			start = getTimeByCycle(date, 1, 1);
			end = getTimeByCycle(date, 1, 2);
			break;
		default:
			return null;
		}
		return getMillisDif(start, end, 1);
	}

	/**
	 * 判断日期
	 * 
	 * @param date
	 *            指定时间
	 * @param type
	 *            1：是当月第一天返回true，否则返回false；2：是当月最后一天返回true，否则返回false；
	 * @return Boolean
	 * @author YuJJ
	 */
	public Boolean isDay(Date date, int type) {
		if (date == null) {
			return null;
		}
		Calendar cal = getCalendar(date);
		switch (type) {
		case 1:
			int day = cal.get(Calendar.DAY_OF_MONTH);
			return day == 1 ? true : false;
		case 2:
			int month = cal.get(Calendar.MONTH);
			cal.add(Calendar.DAY_OF_MONTH, -1);
			int month_next = cal.get(Calendar.MONTH);
			return month == month_next ? false : true;
		default:
			return null;
		}
	}

}