Java程序创建自定义DateTime格式化程序
若要创建自定义DateTime格式器，请使用DateTimeFormatter。首先让我们看看时间-
DateTimeFormatter dtFormat = new DateTimeFormatterBuilder().appendValue(ChronoField.HOUR_OF_DAY)
.appendLiteral(":")
.appendValue(ChronoField.MINUTE_OF_HOUR)
.appendLiteral(":")
.appendValue(ChronoField.SECOND_OF_MINUTE)
.toFormatter();对于日期-
dtFormat = new DateTimeFormatterBuilder().appendValue(ChronoField.YEAR)
.appendLiteral("/")
.appendValue(ChronoField.MONTH_OF_YEAR)
.appendLiteral("/")
.appendValue(ChronoField.DAY_OF_MONTH)
.toFormatter();示例
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.temporal.ChronoField;
public class Demo {
public static void main(String[] args) {
DateTimeFormatter dtFormat = new DateTimeFormatterBuilder() .appendValue(ChronoField.HOUR_OF_DAY)
.appendLiteral(":")
.appendValue(ChronoField.MINUTE_OF_HOUR)
.appendLiteral(":")
.appendValue(ChronoField.SECOND_OF_MINUTE)
.toFormatter();
System.out.println("Time = "+dtFormat.format(LocalDateTime.now()));
dtFormat = new DateTimeFormatterBuilder() .appendValue(ChronoField.YEAR)
.appendLiteral("/")
.appendValue(ChronoField.MONTH_OF_YEAR)
.appendLiteral("/")
.appendValue(ChronoField.DAY_OF_MONTH)
.toFormatter();
System.out.println("Date = "+dtFormat.format(LocalDateTime.now()));
}
}输出结果
Time = 12:47:31 Date = 2019/4/19