java8中的localdate和localtime用法举例如下:这两个方法使我们可以方便的实现将旧的日期类转换为新的日期类,具体思路都是通过Instant当中介,然后通过Instant来创建LocalDateTime(这个类可以很容易获取LocalDate和LocalTime),新的日期类转旧的也是如此,将新的先转成LocalDateTime,然后获取Instant,接着转成Date,具体实现细节如下: // 01. java.util.Date --> java.time.LocalDateTimepublic void UDateToLocalDateTime() { java.util.Date date = new java.util.Date(); Instant instant = date.toInstant(); ZoneId zone = ZoneId.systemDefault(); LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);} // 02. java.util.Date --> java.time.LocalDatepublic void UDateToLocalDate() { java.util.Date date = new java.util.Date(); Instant instant = date.toInstant(); ZoneId zone = ZoneId.systemDefault(); LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone); LocalDate localDate = localDateTime.toLocalDate();} // 03. java.util.Date --> java.time.LocalTimepublic void UDateToLocalTime() { java.util.Date date = new java.util.Date(); Instant instant = date.toInstant(); ZoneId zone = ZoneId.systemDefault(); LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone); LocalTime localTime = localDateTime.toLocalTime();} // 04. java.time.LocalDateTime --> java.util.Datepublic void LocalDateTimeToUdate() { LocalDateTime localDateTime = LocalDateTime.now(); ZoneId zone = ZoneId.systemDefault(); Instant instant = localDateTime.atZone(zone).toInstant(); java.util.Date date = Date.from(instant);} // 05. java.time.LocalDate --> java.util.Datepublic void LocalDateToUdate() { LocalDate localDate = LocalDate.now(); ZoneId zone = ZoneId.systemDefault(); Instant instant = localDate.atStartOfDay().atZone(zone).toInstant(); java.util.Date date = Date.from(instant);} // 06. java.time.LocalTime --> java.util.Datepublic void LocalTimeToUdate() { LocalTime localTime = LocalTime.now(); LocalDate localDate = LocalDate.now(); LocalDateTime localDateTime = LocalDateTime.of(localDate, localTime); ZoneId zone = ZoneId.systemDefault(); Instant instant = localDateTime.atZone(zone).toInstant(); java.util.Date date = Date.from(instant);}
时间: 2025-01-24 07:41:56