java地区选择 Java 特定区域格式

Java日期时间 - Java特定区域格式

我们可以从不同的语言环境创建DateTimeFormatter。

DateTimeFormatter ofLocalizedDate(FormatStyle  dateStyle)
DateTimeFormatter ofLocalizedDateTime(FormatStyle dateTimeStyle)
DateTimeFormatter ofLocalizedDateTime(FormatStyle dateStyle, FormatStyle timeStyle)
DateTimeFormatter ofLocalizedTime(FormatStyle timeStyle)

FormatStyle枚举有四个常量：SHORT，MEDIUM，LONG和FULL。

这些常量以不同的长度格式化日期和时间。

例子

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.Month;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.util.Locale;

public class Main {

  public static void main(String[] args) {
    LocalDate ld = LocalDate.of(2014, Month.JUNE, 21);
    LocalTime lt = LocalTime.of(17, 30, 20);
    LocalDateTime ldt = LocalDateTime.of(ld, lt);

    DateTimeFormatter fmt = DateTimeFormatter
        .ofLocalizedDate(FormatStyle.SHORT);
    System.out.println("Formatter  Default Locale: " + fmt.getLocale());
    System.out.println("Short  Date: " + fmt.format(ld));

    fmt = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM);
    System.out.println("Medium Date: " + fmt.format(ld));

    fmt = DateTimeFormatter.ofLocalizedDate(FormatStyle.LONG);
    System.out.println("Long  Date: " + fmt.format(ld));

    fmt = DateTimeFormatter.ofLocalizedDate(FormatStyle.FULL);
    System.out.println("Full  Date: " + fmt.format(ld));

    fmt = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT);
    System.out.println("Short Time:  " + fmt.format(lt));

    fmt = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT);
    System.out.println("Short  Datetime: " + fmt.format(ldt));

    fmt = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.MEDIUM);
    System.out.println("Medium Datetime: " + fmt.format(ldt));

    // Use German locale to format the datetime in medius style
    fmt = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.MEDIUM).withLocale(
        Locale.GERMAN);
    System.out.println(fmt.format(ldt));

    // Use Indian(English) locale to format datetime in short style
    fmt = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT).withLocale(
        new Locale("en", "IN"));
    System.out.println(fmt.format(ldt));

    // Use Indian(English) locale to format datetime in medium style
    fmt = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.MEDIUM).withLocale(
        new Locale("en", "IN"));
    System.out.println(fmt.format(ldt));

  }
}

上面的代码生成以下结果。