package Test;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class TestTimes {

	public static void main(String args[]) throws ParseException {
		//GregorianCalendar ca = new GregorianCalendar();
		//System.out.println(ca.get(GregorianCalendar.AM_PM));
		Calendar curr = Calendar.getInstance();
		curr.set(Calendar.DAY_OF_MONTH,curr.get(Calendar.DAY_OF_MONTH)-7);
		Date date = curr.getTime();
		String date1 = getStrDateTimeFormat(date);
		System.out.println("上周一"+date1);
		System.out.println("++++++"+getOneWeekDates(date1));
	}
	
	/**
	 * 把日期转化为字符串格式，如：2007-01-05
	 * @param d
	 * @return
	 */
	public static String getStrDateTimeFormat(Date d) {
		String strd = null;
		if (d == null)
			return strd;
		SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
		strd = formatter.format(d); // 将日期时间格式化
		return strd;
	}
	
	/**
	 * 获得一周七天的日期
	 * @param date
	 * @return
	 * @throws ParseException
	 */
	public static String[] getOneWeekDates(String date) throws ParseException {
		return getOneWeekDates(reviseSundayBug(date), "yyyy-MM-dd");
	}
	
	/**
	 * 修正当前日期是周日时计算本周日期的bug
	 * @param date
	 * @return
	 * @throws ParseException
	 */
	private static String reviseSundayBug(String date) throws ParseException {
		if (getDayOfTheWeek(date) == Calendar.SUNDAY) {
			Calendar c = Calendar.getInstance();
			c.setTime(parseDateStr(date, "yyyy-MM-dd"));
			c.add(Calendar.DATE, -7);
			SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
			date = format.format(c.getTime());
		}
		return date;
	}
	
	/**
	 * 按照指定格式日期获得一周七天的日期
	 * @param date
	 * @param df
	 * @return
	 * @throws ParseException
	 */
	public static String[] getOneWeekDates(String date, String df)
			throws ParseException {
		String[] dates = new String[7];
		dates[0] = getDayOfTheWeek(date, df, Calendar.MONDAY);
		dates[1] = getDayOfTheWeek(date, df, Calendar.TUESDAY);
		dates[2] = getDayOfTheWeek(date, df, Calendar.WEDNESDAY);
		dates[3] = getDayOfTheWeek(date, df, Calendar.THURSDAY);
		dates[4] = getDayOfTheWeek(date, df, Calendar.FRIDAY);
		dates[5] = getDayOfTheWeek(date, df, Calendar.SATURDAY);
		dates[6] = getDayOfTheWeek(date, df, Calendar.SUNDAY);
		System.out.println("上周一"+dates[0]);
		System.out.println("上周日"+dates[6]);
		return dates;
	}
	
	/**
	 * 获得指定日期所在周的周几的日期
	 * @param date 字符串格式的日期
	 * @param df 日期的格式化字符串，如yyyy-MM-dd
	 * @param DAY_OF_WEEK 周几，如Calendar.MONDAY
	 * @return
	 * @throws ParseException
	 */
	public static String getDayOfTheWeek(String date, String df, int DAY_OF_WEEK) throws ParseException {
		Calendar c = Calendar.getInstance();
		c.setTime(parseDateStr(date, df));
		c.set(Calendar.DAY_OF_WEEK, DAY_OF_WEEK);
		// 中国习惯是周日是一个星期的最后一天
		if (DAY_OF_WEEK == Calendar.SUNDAY) {
			c.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
			c.add(Calendar.DATE, 1);
		}
		return new SimpleDateFormat(df).format(c.getTime());
	}

	/**
	 * 获得当前日期是周几
	 * @param date
	 * @return 周几在Calendar类中对应的静态变量值
	 * @throws ParseException
	 */
	public static int getDayOfTheWeek(String date) throws ParseException {
		Calendar c = Calendar.getInstance();
		c.setTime(parseDateStr(date, "yyyy-MM-dd"));
		return c.get(Calendar.DAY_OF_WEEK);
	}
	
	/**
	 * 解析时间日期字符串
	 * @param date
	 * @param format
	 * @return
	 * @throws ParseException
	 */
	public static Date parseDateStr(String date, String format) throws ParseException {
		DateFormat df = new SimpleDateFormat(format);
		try {
			return df.parse(date);
		} catch (ParseException e) {
			e.printStackTrace();
			throw e;
		}
	}	
}