java8获取以秒单位的时间戳

import java.sql.Timestamp;

//不带小时，分钟

public static long getTimeStamp(int len) {

                //LocalTime.of(0,0)换成LocalTime.now()可获得完整的时间戳（13位毫秒)

long timestamp = Timestamp.valueOf(LocalDateTime.of(LocalDate.now(), LocalTime.of(0, 0))).getTime();

//timestamp.toInstant().getEpochSecond();10位长度的时间戳

return len == 10 ? timestamp/1000 : timestamp;

}

//获取完整的秒时间戳

Instant.now().getEpochSecond();//10

//毫秒级时间戳

System.currentTimeMillis()