Java8：LocalDate/ LocalDateTime与String、Date、TimeStamp的互转
LocalDate与String、Date、TimeStamp的互转：
https://img2022.cnblogs.com/blog/2504389/202206/2504389-20220623185459245-1798244758.png
LocalDateTime与String、Date、TimeStamp的互转：
https://img2022.cnblogs.com/blog/2504389/202206/2504389-20220623185634298-1978152577.png
结果如下：
https://img2022.cnblogs.com/blog/2504389/202206/2504389-20220623185714909-1959756770.png
附代码：
public static void main(String[] args) {
System.out.println("-------------------------LocalDate-----------------------------");
LocalDate localDate = LocalDate.now();
System.out.println("localDate = " + localDate);
// LocalDate 转换为 String
DateTimeFormatter formatter=DateTimeFormatter.ofPattern("yyyy-MM-dd");
String time = localDate.format(formatter);
System.out.println("time = " + time);
// LocalDate 转换为 Date
Date date = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
System.out.println("date = " + date);
// LocalDate 转换为 时间戳（毫秒数）
long timestamp = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant()).getTime();
System.out.println("timestamp = " + timestamp);
// 时间戳（毫秒数） 转换为 LocalDate
LocalDate time_localDate = Instant.ofEpochMilli(timestamp).atOffset(ZoneOffset.ofHours(8)).toLocalDate();
System.out.println("time_localDate = " + time_localDate);
// Date 转换为 LocalDate
LocalDate date_localDate = date.toInstant().atZone(ZoneOffset.ofHours(8)).toLocalDate();
System.out.println("date_localDate = " + date_localDate);
// String 转换为 LocalDate
LocalDate string_localDate = LocalDate.parse(time, formatter);
System.out.println("string_localDate = " + string_localDate);
System.out.println("-------------------------LocalDateTime-----------------------------");
LocalDateTime localDateTime = LocalDateTime.now();
System.out.println("localDateTime = " + localDateTime);
// LocalDateTime 转换为 String
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
String localDateTime_string = dtf.format(localDateTime);
System.out.println("localDateTime_string = " + localDateTime_string);
// LocalDateTime 转换为 Date
Date localDateTime_date = Date.from(localDateTime.atZone(ZoneOffset.ofHours(8)).toInstant());
System.out.println("localDateTime_date = " + localDateTime_date);
// LocalDateTime 转换为 时间戳（毫秒数）
long localDateTime_timestamp = localDateTime.toInstant(ZoneOffset.ofHours(8)).toEpochMilli();
System.out.println("localDateTime_timestamp = " + localDateTime_timestamp);
// 时间戳（毫秒数） 转换为 LocalDateTime
LocalDateTime timestamp_localDateTime = Instant.ofEpochMilli(localDateTime_timestamp).atZone(ZoneOffset.ofHours(8)).toLocalDateTime();
System.out.println("timestamp_localDateTime = " + timestamp_localDateTime);
// Date 转换为 LocalDateTime
LocalDateTime date_localDateTime = localDateTime_date.toInstant().atZone(ZoneOffset.ofHours(8)).toLocalDateTime();
System.out.println("date_localDateTime = " + date_localDateTime);
// String 转换为 LocalDateTime
LocalDateTime string_localDateTime = LocalDateTime.parse(localDateTime_string, dtf);
System.out.println("string_localDateTime = " + string_localDateTime);
}
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