JAVA获取日期：今天，昨天，本周，本月，本年

/**
 * 日期工具类
 */
public class DateUtils {

	/**
	 * 获取今天
	 * @return String
	 * */
	public static String getToday(){
		return new SimpleDateFormat("yyyy-MM-dd").format(new Date());
	}
	/**
	 * 获取昨天
	 * @return String
	 * */
	public static String getYestoday(){
		Calendar cal=Calendar.getInstance();
		cal.add(Calendar.DATE,-1);
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本月开始日期
	 * @return String
	 * **/
	public static String getMonthStart(){
		Calendar cal=Calendar.getInstance();
		cal.add(Calendar.MONTH, 0);
		cal.set(Calendar.DAY_OF_MONTH, 1);
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本月最后一天
	 * @return String
	 * **/
	public static String getMonthEnd(){
		Calendar cal=Calendar.getInstance();
		cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本周的第一天
	 * @return String
	 * **/
	public static String getWeekStart(){
		Calendar cal=Calendar.getInstance();
		cal.add(Calendar.WEEK_OF_MONTH, 0);
		cal.set(Calendar.DAY_OF_WEEK, 2);
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本周的最后一天
	 * @return String
	 * **/
	public static String getWeekEnd(){
		Calendar cal=Calendar.getInstance();
		cal.set(Calendar.DAY_OF_WEEK, cal.getActualMaximum(Calendar.DAY_OF_WEEK));
		cal.add(Calendar.DAY_OF_WEEK, 1);
		Date time=cal.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(time);
	}
	/**
	 * 获取本年的第一天
	 * @return String
	 * **/
	public static String getYearStart(){
		return new SimpleDateFormat("yyyy").format(new Date())+"-01-01";
	}

	/**
	 * 获取本年的最后一天
	 * @return String
	 * **/
	public static String getYearEnd(){
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.MONTH,calendar.getActualMaximum(Calendar.MONTH));
		calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
		Date currYearLast = calendar.getTime();
		return new SimpleDateFormat("yyyy-MM-dd").format(currYearLast);
	}
}

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