java中如何把字符串日期转时间戳

定义一个字符串日期;

String dataStr="2022-06-01";

public static java.sql.Timestamp parseTimestamp(String dateStr) {
    return parseTimestamp(dateStr, "yyyy/MM/dd HH:mm:ss");
}

public static java.sql.Timestamp parseTimestamp(String dateStr,
        String format) {
    java.util.Date date = parseDate(dateStr, format);
    if (date != null) {
        long t = date.getTime();
        return new java.sql.Timestamp(t);
    } else {
        return null;
    }
}

public static java.util.Date parseDate(String dateStr, String format) {
    java.util.Date date = null;
    try {
        java.text.DateFormat df = new java.text.SimpleDateFormat(format);
        String dt = dateStr.replaceAll("-", "/");
        if ((!dt.equals(""))) {
            dt +=
                    format.substring(dt.length()).replaceAll("[YyMmDdHhSs]", "0");
        }
        date = (java.util.Date) df.parse(dt);
    } catch (Exception e) {
       e.printStackTrace();
    }
    return date;
}

运行结果