将时间戳转换成时间

将时间戳转换成时间，比如将1441267486转换成2015/09/03

代码如下:

public static String getDate(String str) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
		String date = sdf.format(new Date(WWUitls.string2Long(str) * 1000L));
		return date;
	}

public static long string2Long(String strNum) {
		long num = 0;
		try {
			if (strNum != null && !strNum.equals(""))
				num = Long.parseLong(strNum);
		} catch (NumberFormatException e) {
			System.out.println("[NumberFormatException: strNum = " + strNum
					+ "]");
			e.printStackTrace();
		}
		return num;
	}