Java获取精确到毫秒的时间戳

import java.util.Date;

public class Timestamp {

    /**
      获取精确到毫秒的时间戳
     * @param date
     * @return
     **/
    public static Long getTimestamp(Date date){
        if (null == date) {
            return (long) 0;
        }
        String timestamp = String.valueOf(date.getTime());
        return Long.valueOf(timestamp);
    }  

    public static void main(String[] args) {
        Date d = new Date();
        System.out.println(getTimestamp(d));
　　　　 //结果：1504535566231
    }
}