时间戳格式的日期与8位格式转换，日期格式数据与字符串形式的转换。

public final class DateUtils {    //时间戳转化为8位格式    public static String stampToDate(String stamp){        String date = "";        if(StringUtil.isNotNull(stamp)){            Date date1 = null;            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");            try {                parse:把String型的字符串转换成特定格式的date类型                date1 = dateFormat.parse(stamp);            } catch (ParseException e) {                e.printStackTrace();            }            SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");            date = format.format(date1);        }        return date;    }    //8位格式转化为时间戳    public static String dateToStamp(String date){        String stamp = "";        if(StringUtil.isNotNull(date)){            Date date1 = null;            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");            try {                parse:把String型的字符串转换成特定格式的date类型                date1 = dateFormat.parse(date);            } catch (ParseException e) {                e.printStackTrace();            }            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");            date = format.format(date1);        }        return stamp;    }    //性别转换,男女转F,M    public static String toOnline(String gender){        String genderJudge = "";        if(gender!=null){            if (("M").equals(gender)) {                genderJudge = "1";            } else if (("F").equals(gender)) {                genderJudge = "0";            } else {                genderJudge = "";            }        }else{            genderJudge = "";        }        return genderJudge;    }    //性别转换,男女转1,2    public static String toOffline(String gender){        String genderJudge = "";        if (gender.equals("1")) {            genderJudge = "M";        } else if (gender.equals("0")) {            genderJudge = "F";        } else {            genderJudge = "";        }        return genderJudge;    }}