java获取上周最后一天 java获取一周前日期

//获得一周前的日期
public String lastWeek() {
	Date date = new	Date();
	int year = Integer.parseInt(new	SimpleDateFormat("yyyy").format(date));
	int month = Integer.parseInt(new SimpleDateFormat("MM").format(date));
	int day	= Integer.parseInt(new SimpleDateFormat("dd").format(date)) - 7;

	if (day	< 1) {
		month -= 1;
		if (month == 0)	{
			year -=	1;
			month =	12;
		}
		if (month == 4 || month	== 6 ||	month == 9 || month == 11) {
			day = 30 + day;
		} else if (month == 1 || month == 3 || month ==	5 || month == 7
				|| month == 8 || month == 10 ||	month == 12) {
			day = 31 + day;
		} else if (month == 2) {
			if (year % 400 == 0 || (year % 4 == 0 && year %	100 != 0))
				day = 29 + day;
			else
				day = 28 + day;
		}
	}
	String y = year	+ "";
	String m = "";
	String d = "";
	if (month < 10)
		m = "0"	+ month;
	else
		m = month + "";
	if (day	< 10)
		d = "0"	+ day;
	else
		d = day	+ "";

	return y + "-" + m + "-" + d;
}