一些关于日期操作的方法（二）-优快云博客

本文介绍了一种使用Java进行日期格式转换的方法，包括将特定格式的字符串转换为Date对象，同时还提供了获取指定日期所在周的星期一和星期日的具体实现。

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日期格式字符串生成Date：

private static final String SHORT_FORMAT = "yyyy-MM-dd";
private static final String LONG_FORMAT = "yyyy-MM-dd HH:mm:ss";

public static Date getFormatDate(String dateString, String formatType) {
		Date ret = null;
		try {
			if (dateString == null || dateString.equals("") || formatType == null
					|| formatType.equals("")) {
				return new Date();
			}
			ret = new SimpleDateFormat(formatType).parse(dateString);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return ret;
	}

2.获取日期所在周的星期一和星期日的日期

public static Date getWeekStartDate(Date date) {
		Date ret = null;
		try {
			if (date == null) {
				return ret;
			}

			Calendar calendar = Calendar.getInstance();
			calendar.setTime(date);

			int weekDay = calendar.get(Calendar.DAY_OF_WEEK) - 1;
			switch (weekDay) {
			case 0:
				calendar.add(Calendar.DAY_OF_MONTH, -6);
				break;
			case 1:
				break;
			default:
				calendar.add(Calendar.DAY_OF_MONTH, -(weekDay - 1));
			}

			ret = calendar.getTime();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return ret;
	}

	public static Date getWeekEndDate(Date date) {
		Date ret = null;
		try {
			if (date == null) {
				return ret;
			}

			Calendar calendar = Calendar.getInstance();
			calendar.setTime(date);

			int weekDay = calendar.get(Calendar.DAY_OF_WEEK) - 1;
			switch (weekDay) {
			case 0:
				break;
			default:
				calendar.add(Calendar.DAY_OF_MONTH, (7 - weekDay));
			}

			ret = calendar.getTime();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return ret;
	}