Date 对象转换成时间字符串
案例代码:
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateStr = format.format(new Date());
System.out.println(dateStr);
输出结果:
2022-07-30 16:19:45
时间字符串转换成 Date 对象
案例代码:
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateStr = "2022-07-30 16:19:45";
Date date = format.parse(dateStr);
System.out.println(date);
输出结果:
Sat Jul 30 16:19:45 CST 2022
LocalDateTime 对象转换成时间字符串
案例代码:
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime localDateTime = LocalDateTime.now();
String dateStr = formatter.format(localDateTime);
System.out.println(dateStr);
输出结果:
2022-07-30 16:13:19
时间字符串转换成 LocalDateTime 对象
案例代码:
String dateStr = "2022-07-30 16:13:19";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime localDateTime = LocalDateTime.parse(dateStr, formatter);
System.out.println(localDateTime);
输出结果:
2022-07-30T16:13:19