小记·Java计算时间差（java用时间戳计算时间差）

应用场景：SQL调用时间，接口调用时间

LocalDateTime one = LocalDateTime.now();
LocalDateTime two = LocalDateTime.now();
LocalDateTime three = LocalDateTime.now();
LocalDateTime fore = LocalDateTime.now();
Long oneTwo = Duration.between(one,two).toMillis();
Long twoThree = Duration.between(two,three).toMillis();
Long threeFore = Duration.between(three,fore).toMillis();