1、 通过localDate类获取(不常见)
https://www.cnblogs.com/qingyunfc/p/10236734.html
可以通过这个来了解
LocalDate localDate = LocalDate.now();
LocalTime localTime = LocalTime.now();
LocalDateTime localDateTime = LocalDateTime.now();
System.out.println("LocalDate.now():"+localDate);
System.out.println("LocalTime.now():"+localTime);
System.out.println("LocalDateTime.now():"+localDateTime);
2、 Date类获取
Date date = new Date();
System.out.println(date.getTime());
3 、System类获取
long currentTimeMillis = System.currentTimeMillis();
System.out.println("System.currentTimeMillis():"+currentTimeMillis);
4、 使用 SimpleDateFormat
//设置日期格式
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// new Date()为获取当前系统时间
System.out.println(df.format(new Date()));
5 、通过sql包下的Timestamp类获取，精确到毫秒，格式为：yyyy-MM-dd :hh:mm:ss:nnn
System.out.println(new Timestamp(System.currentTimeMillis()));
6 获取当前时间，可以获取单个时间域，通过Util包下的Calendar获取
// 可以对每个时间域单独修改
Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH+1);
int date1 = c.get(Calendar.DATE);
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
int second = c.get(Calendar.SECOND);
System.out.println(year + "/" + month + "/" + date1 + " " + hour + ":" + minute + ":" + second);
本篇主要参考了https://blog.csdn.net/a549654065/article/details/88687543
