Configuring a Global Date and Time Format

默认情况下，未用 @DateTimeFormat 注释的日期和时间字段通过使用 DateFormat.SHORT 样式从字符串转换。如果您愿意，可以通过定义您自己的全局格式来更改它。

By default, date and time fields not annotated with @DateTimeFormat are converted from strings by using the DateFormat.SHORT style. If you prefer, you can change this by defining your own global format.

为此，请确保 Spring 不注册默认格式化程序。相反，在以下帮助下手动注册格式化程序：

To do that, ensure that Spring does not register default formatters. Instead, register formatters manually with the help of:

org.springframework.format.datetime.standard.DateTimeFormatterRegistrar
org.springframework.format.datetime.DateFormatterRegistrar

例如，以下配置注册了全局 yyyyMMdd 格式：

For example, the following configuration registers a global yyyyMMdd format:

Java
Kotlin
Xml

@Configuration
public class ApplicationConfiguration {

	@Bean
	public FormattingConversionService conversionService() {

		// Use the DefaultFormattingConversionService but do not register defaults
		DefaultFormattingConversionService conversionService =
				new DefaultFormattingConversionService(false);

		// Ensure @NumberFormat is still supported
		conversionService.addFormatterForFieldAnnotation(
				new NumberFormatAnnotationFormatterFactory());

		// Register JSR-310 date conversion with a specific global format
		DateTimeFormatterRegistrar dateTimeRegistrar = new DateTimeFormatterRegistrar();
		dateTimeRegistrar.setDateFormatter(DateTimeFormatter.ofPattern("yyyyMMdd"));
		dateTimeRegistrar.registerFormatters(conversionService);

		// Register date conversion with a specific global format
		DateFormatterRegistrar dateRegistrar = new DateFormatterRegistrar();
		dateRegistrar.setFormatter(new DateFormatter("yyyyMMdd"));
		dateRegistrar.registerFormatters(conversionService);

		return conversionService;
	}
}

@Configuration
class ApplicationConfiguration {

	@Bean
	fun conversionService(): FormattingConversionService {
		// Use the DefaultFormattingConversionService but do not register defaults
		return DefaultFormattingConversionService(false).apply {

			// Ensure @NumberFormat is still supported
			addFormatterForFieldAnnotation(NumberFormatAnnotationFormatterFactory())

			// Register JSR-310 date conversion with a specific global format
			val dateTimeRegistrar = DateTimeFormatterRegistrar()
			dateTimeRegistrar.setDateFormatter(DateTimeFormatter.ofPattern("yyyyMMdd"))
			dateTimeRegistrar.registerFormatters(this)

			// Register date conversion with a specific global format
			val dateRegistrar = DateFormatterRegistrar()
			dateRegistrar.setFormatter(DateFormatter("yyyyMMdd"))
			dateRegistrar.registerFormatters(this)
		}
	}
}

<bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
	<property name="registerDefaultFormatters" value="false" />
	<property name="formatters">
		<set>
			<bean class="org.springframework.format.number.NumberFormatAnnotationFormatterFactory" />
		</set>
	</property>
	<property name="formatterRegistrars">
		<set>
			<bean class="org.springframework.format.datetime.standard.DateTimeFormatterRegistrar">
				<property name="dateFormatter">
					<bean class="org.springframework.format.datetime.standard.DateTimeFormatterFactoryBean">
						<property name="pattern" value="yyyyMMdd"/>
					</bean>
				</property>
			</bean>
		</set>
	</property>
</bean>

请注意，在 Web 应用程序中配置日期和时间格式时需要注意其他事项。请参阅 WebMVC Conversion and Formatting 或 WebFlux Conversion and Formatting。

Note there are extra considerations when configuring date and time formats in web applications. Please see WebMVC Conversion and Formatting or WebFlux Conversion and Formatting.