Java日期操作DateTimeUtil

package com.lcr.tools.util.date;

import java.io.Serializable;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateTimeUtil implements Serializable {

	/**  
	* serialVersionUID:TODO
	*  
	* @author: lu chunli
	* @date:   2012-5-13 下午02:44:59
	* @version 1.0.0
	*   
	*/  
	
	private static final long serialVersionUID = 1L;
	
	
	private  static final SimpleDateFormat longDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	
	private  static final SimpleDateFormat shortDateFormat = new SimpleDateFormat("yyyy-MM-dd");
	
	/**
	 * 根据一个日期，返回是星期几的字符串
	 */
	private static String getWeek (String strDate) {
		// 再转换为时间
		Date date = null;
		try {
			date = shortDateFormat.parse(strDate);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		
		return new SimpleDateFormat("EEEE").format(calendar.getTime());
	}
	
	/**
	 * 取当天(短日期类型)
	 */
	private static String getShortToday () {
		Date today = new Date();
		return shortDateFormat.format(today); 
	}
	
	/**
	 * 取当天(长日期类型)
	 */
	private static String getLongToday () {
		Date today = new Date();
		return longDateFormat.format(today); 
	}
	
	/**
	 * 取当天零点零分零秒
	 */
	private static String getTodayStart () {
		Calendar calendar = Calendar.getInstance();
		//如果没有这种设定的话回去系统的当期的时间
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		Date date = new Date(calendar.getTimeInMillis());
		return longDateFormat.format(date);
	}	

	/**
	 * 取当天23点59分59秒
	 */
	private static String getTodayEnd () {
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.HOUR_OF_DAY, 23);	
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		Date date = new Date(calendar.getTimeInMillis());
		return longDateFormat.format(date);
	}	

	/**
	 * 取特定日期的零点零分零秒
	 */
	private static String getDateStart (String strDate) {
		if (null == strDate || "".equals(strDate.trim())) {
			return "";
		}
		Date date = null;
		try {
			date = shortDateFormat.parse(strDate);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return longDateFormat.format(date);
	}
	
	/**
	 * 取特定日期的零点零分零秒
	 */
	private static String getDateEnd (String strDate) {
		if (null == strDate || "".equals(strDate.trim())) {
			return "";
		}
		Date date = null;
		try {
			date = shortDateFormat.parse(strDate);
		} catch (ParseException e) {
			e.printStackTrace();
		}

		//这样能够取到59分59秒
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.set(Calendar.HOUR_OF_DAY, 23);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		calendar.set(Calendar.MILLISECOND, 0);
		
		return longDateFormat.format(calendar.getTime());
	}

	/**
	 * 取当周周一
	 */
	private static String getMondayOfThisWeek () {
		Calendar calendar = Calendar.getInstance();
		int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
		if (day_of_week == 0){
			day_of_week = 7;
		}
		calendar.add(Calendar.DATE, -day_of_week + 1);
		/*calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);*/
		return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取当周周日
	 */
	private static String getSundayOfThisWeek () {
		Calendar calendar = Calendar.getInstance();
		int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
		if (day_of_week == 0){
			day_of_week = 7;
		}
		calendar.add(Calendar.DATE, -day_of_week + 1);
		/*calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);*/
		//以上取得的是周一
		calendar.add(Calendar.DATE, 6);
		return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取上周周一
	 */
	private static String getMondayOfPreviousWeek () {
		Calendar calendar = Calendar.getInstance();
		int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
		if (day_of_week == 0){
			day_of_week = 7;
		}
		calendar.add(Calendar.DATE, -day_of_week + 1);
		calendar.add(Calendar.DATE, -7);
		return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取上周周日
	 */
	private static String getSundayOfPreviousWeek () {
		Calendar calendar = Calendar.getInstance();
		int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
		if (day_of_week == 0){
			day_of_week = 7;
		}
		calendar.add(Calendar.DATE, -day_of_week + 1);
		calendar.add(Calendar.DATE, -1);
		return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取下周周一
	 */
	private static String getMondayOfNextWeek () {
		Calendar calendar = Calendar.getInstance();
		int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
		if (day_of_week == 0){
			day_of_week = 7;
		}
		calendar.add(Calendar.DATE, -day_of_week + 1);	// 当周周一
		calendar.add(Calendar.DATE, 7);
		return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取下周周日
	 */
	private static String getSundayOfNextWeek () {
		Calendar calendar = Calendar.getInstance();
		int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
		if (day_of_week == 0){
			day_of_week = 7;
		}
		calendar.add(Calendar.DATE, -day_of_week + 1); 	// 当周周一
		calendar.add(Calendar.DATE, 13);
		return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取当月1号
	 */
	private static String getFirstDayOfThisMonth () {
		 Calendar calendar = Calendar.getInstance();  
		 calendar.set(Calendar.DATE, 1);	// 设为当前月的1号  
		 return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取当月最后一天
	 */
	private static String getLastDayOfThisMonth () {
		 Calendar calendar = Calendar.getInstance();  
		 calendar.set(Calendar.DATE, 1);	// 设为当前月的1号  
		 calendar.add(Calendar.MONTH, 1);	// 加一个月，变为下月的1号
		 calendar.add(Calendar.DATE, -1);	// 减去一天，变为当月最后一天
		 return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取上月1号
	 */
	private static String getFirstDayOfPreviousMonth () {
		 Calendar calendar = Calendar.getInstance();  
		 calendar.set(Calendar.DATE, 1);	// 设为当前月的1号  
		 calendar.add(Calendar.MONTH, -1);	// 减一个月，变为上月的1号
		 return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取上月最后一天
	 */
	private static String getLastDayOfPreviousMonth () {
		 Calendar calendar = Calendar.getInstance();  
		 calendar.set(Calendar.DATE, 1);	// 设为当前月的1号  
		 calendar.add(Calendar.DATE, -1);	// 减去一天，变为上月最后一天
		 return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取下月1号
	 */
	private static String getFirstDayOfNextMonth () {
		Calendar calendar = Calendar.getInstance();
		calendar.add(Calendar.MONTH, 1);	// 加一个月
		calendar.set(Calendar.DATE, 1);		// 把日期设置为当月第一天
		return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 取下月最后一天
	 */
	private static String getLastDayOfNextMonth () {
		Calendar calendar = Calendar.getInstance();
		calendar.add(Calendar.MONTH, 1);// 加一个月
		calendar.set(Calendar.DATE, 1);// 把日期设置为当月第一天
		calendar.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天
		return shortDateFormat.format(calendar.getTime());
	}
	
	/**
	 * 获得本年有多少天
	 */
	private static int getTotalDaysOfThisYear() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天
		calendar.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。
		int totalDays = calendar.get(Calendar.DAY_OF_YEAR);
		return totalDays;
	}
	
	/**
	 * 获取某年某月的最后一天
	 */
	private static 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;
	}

	/**
	 * 是否闰年
	 */
	public static boolean isLeapYear (int year) {
		return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
	}
	

	/**
	 * 获得本年第一天的日期
	 */
	public static String getFirstDayOfThisYear () {
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.MONTH, 1);
		calendar.set(Calendar.DAY_OF_YEAR, 1);
		Date date = new Date(calendar.getTimeInMillis());
		return shortDateFormat.format(date);
	}

	/**
	 *  获得本年最后一天的日期
	 */
	public static String getLastDayOfThisYear () {
		Date date = new Date();
		String years = new SimpleDateFormat("yyyy").format(date);
		return years + "-12-31";
	}
	
	/**
	 *  获得上年第一天的日期 *
	 */
	public static String getFirstDayOfPreviousYear () {
		Calendar calendar = Calendar.getInstance();
		calendar.add(Calendar.YEAR, -1);	// 若是 明年改为正整数1即可
		calendar.set(Calendar.MONTH, 1);
		calendar.set(Calendar.DAY_OF_YEAR, 1);
		Date date = new Date(calendar.getTimeInMillis());
		return shortDateFormat.format(date);
	}
	
	/**
	 * 两个时间之间的天数
	 */
	public static long getDays (String date1, String date2) {
		if (date1 == null || "".equals(date1.trim())) {
			return 0;
		}
		if (date2 == null || "".equals(date2.trim())) {
			return 0;
		}
		// 转换为标准时间
		Date date = null;
		Date mydate = null;
		try {
			date = shortDateFormat.parse(date1);
			mydate = shortDateFormat.parse(date2);
		} catch (Exception e) {
			e.printStackTrace();
		}
		long day = 0;
		if (date.before(mydate)) {
			day = (mydate.getTime() - date.getTime()) / (24 * 60 * 60 * 1000);
		} else {
			day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
		}
		return day;
	}
	
	/**
	 * 
	 */
	public static void main(String[] args) {
		System.out.println("/*--------------------------两个时间之间的天数--------------------------*/");
		System.out.println("两个时间之间的天数1	:	" + getDays ("2012-05-10", "2012-05-15"));
		System.out.println("两个时间之间的天数2	:	" + getDays ("2012-06-10", "2012-05-15"));
		System.out.println("/*--------------------------获得上年第一天的日期--------------------------*/");
		System.out.println("获得上年第一天的日期	:	" + getFirstDayOfPreviousYear ());
		System.out.println("/*--------------------------获得本年最后一天的日期--------------------------*/");
		System.out.println("获得本年最后一天的日期	:	" + getLastDayOfThisYear ());
		System.out.println("/*--------------------------获得本年第一天的日期--------------------------*/");
		System.out.println("获得本年第一天的日期	:	" + getFirstDayOfThisYear ());
		System.out.println("/*--------------------------获取某年某月的最后一天--------------------------*/");
		System.out.println("获取某年某月的最后一天	:	" + getLastDayOfMonth (2012, 5));
		System.out.println("/*--------------------------------是否闰年---------------------------------*/");
		System.out.println("是否闰年		 		:	" + isLeapYear(2012));
		System.out.println("/*--------------------------获得本年有多少天--------------------------*/");
		System.out.println("获得本年有多少天 		:	" + getTotalDaysOfThisYear());
		System.out.println("/*--------------------------下月1号和最后一天--------------------------*/");
		System.out.println("下月1号				:	" + getFirstDayOfNextMonth());
		System.out.println("下月最后一天			:	" + getLastDayOfNextMonth ());
		System.out.println("/*--------------------------上月1号和最后一天--------------------------*/");
		System.out.println("上月1号				:	" + getFirstDayOfPreviousMonth());
		System.out.println("上月最后一天			:	" + getLastDayOfPreviousMonth ());
		System.out.println("/*--------------------------当月1号和最后一天--------------------------*/");
		System.out.println("当月1号				:	" + getFirstDayOfThisMonth());
		System.out.println("当月最后一天			:	" + getLastDayOfThisMonth ());
		System.out.println("/*--------------------------当月1号和最后一天--------------------------*/");
		System.out.println("当月1号				:	" + getFirstDayOfThisMonth());
		System.out.println("当月最后一天			:	" + getLastDayOfThisMonth ());
		System.out.println("/*--------------------------下周周一和周日--------------------------*/");
		System.out.println("下周周一				:	" + getMondayOfNextWeek());
		System.out.println("下周周日				:	" + getSundayOfNextWeek ());
		System.out.println("/*--------------------------上周周一和周日--------------------------*/");
		System.out.println("上周周一				:	" + getMondayOfPreviousWeek());
		System.out.println("上周周日				:	" + getSundayOfPreviousWeek ());
		System.out.println("/*--------------------------当周周一和周日--------------------------*/");
		System.out.println("当周周一				:	" + getMondayOfThisWeek ());
		System.out.println("当周周日				:	" + getSundayOfThisWeek ());
		System.out.println("/*--------------------------特定日期(零点和23点)--------------------------*/");
		System.out.println("特定日期(23点59分59秒)	:	" + getDateEnd ("2012-05-12"));
		System.out.println("特定日期(零点零分零秒)	:	" + getDateStart ("2012-05-12"));
		System.out.println("/*--------------------------当天(零点和23点)--------------------------*/");
		System.out.println("当天(23点59分59秒)	:	" + getTodayEnd ());
		System.out.println("当天(零点零分零秒)	:	" + getTodayStart ());
		System.out.println("/*---------------------------当天(长日期格式和短日期格式)-------------------------*/");
		System.out.println("当天(长日期格式)		:	" + getLongToday ());
		System.out.println("当天(短日期格式)		:	" + getShortToday ());
		System.out.println("/*---------------------------当天(长日期格式和短日期格式)-------------------------*/");
		System.out.println("根据一个日期，返回是星期几的字符串		:	" + getWeek ("2012-05-12"));
	}
}