Java获取日期节点

package com.uu.component.statistics.test;

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 TimeTest
{
	// 用来全局控制 上一周，本周，下一周的周数变化
	private int weeks = 0;
	private int MaxDate;// 一月最大天数
	private int MaxYear;// 一年最大天数

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		TimeTest tt = new TimeTest();
		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("获取本季度第一天到最后一天:" + tt.getThisSeasonTime(4));
		System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"
				+ TimeTest.getTwoDay("2008-12-1", "2008-9-29"));
	}

	/**
	 * 得到二个日期间的间隔天数
	 */
	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 + "";
	}

	/**
	 * 根据一个日期，返回是星期几的字符串
	 * 
	 * @param sdate
	 * @return
	 */
	public static String getWeek(String sdate)
	{
		// 再转换为时间
		Date date = TimeTest.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());
	}

	/**
	 * 将短时间格式字符串转换为时间 yyyy-MM-dd
	 * 
	 * @param strDate
	 * @return
	 */
	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;
	}

	/**
	 * 两个时间之间的天数
	 * 
	 * @param date1
	 * @param date2
	 * @return
	 */
	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;
	}

	// 计算当月最后一天,返回字符串
	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;
	}

	// 上月第一天
	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;
	}

	// 获取当月第一天
	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;
	}

	// 获得本周星期日的日期
	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;
	}

	// 获取当天时间
	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;
	}

	// 获得当前日期与本周日相差的天数
	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1
		if (dayOfWeek == 1)
		{
			return 0;
		}
		else
		{
			return 1 - dayOfWeek;
		}
	}

	// 获得本周一的日期
	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;
	}

	// 获得相应周的周六的日期
	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;
	}

	// 获得上周星期日的日期
	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;
	}

	// 获得上周星期一的日期
	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;
	}

	// 获得下周星期一的日期
	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;
	}

	// 获得下周星期日的日期
	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;
		}
	}

	// 获得上月最后一天的日期
	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;
	}

	// 获得下个月第一天的日期
	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;
	}

	// 获得下个月最后一天的日期
	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;
	}

	// 获得明年最后一天的日期
	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;
	}

	// 获得明年第一天的日期
	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;

	}

	// 获得本年有多少天
	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;
		}
	}

	// 获得本年第一天的日期
	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);
		getThisSeasonTime(11);
		return preYearDay;
	}

	// 获得本季度
	public String getThisSeasonTime(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
				+ ";" + years_value + "-" + end_month + "-" + end_days;
		return seasonDate;

	}

	/**
	 * 获取某年某月的最后一天
	 * 
	 * @param year
	 *            年
	 * @param month
	 *            月
	 * @return 最后一天
	 */
	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;
	}

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

原文地址：http://blog.csdn.net/wsf/archive/2010/07/22/5756083.aspx