java日期和时间戳格式互转

// 将日期格式转换成时间戳

 public static void main(String[] args) throws Exception{
     String time = "2018-05-12 12:30:59";
     Date parse = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(time);
     Long time1 = parse.getTime();
     System.out.println(time + " >> " + time1);
 }

// 将时间戳转换成日期格式

 public static void main(String[] args) {
     Long time  = 1527816283000L;
     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     String time1 = sdf.format(new Date(time));
     System.out.println(time + " >> " + time1);
 }