时间字符串与当前时间比較

/*获得当前时间*/
    public static String getCurrentTime(){
        Date currentTime = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String dateString = formatter.format(currentTime);
        return dateString;
    }
    
    /*时间比大小*/
    public static int timeCompare(String t1,String t2){
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar c1=Calendar.getInstance();
        Calendar c2=Calendar.getInstance();
        try {
c1.setTime(formatter.parse(t1));
c2.setTime(formatter.parse(t2));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
        int result=c1.compareTo(c2);
        return result;
    }
    
//    public static void main(String[] args) {
//     String coupon_valid_end = "3004-03-26 13:31:40";
// String currenttime = getCurrentTime();
//     int flagnum = timeCompare(coupon_valid_end, currenttime);
//     System.out.println(flagnum);
// }