配置全局日期和时间格式

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

为此，请确保 Spring 未注册默认格式化程序。相反，请使用以下方法手动注册格式化程序：

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

例如，以下 Java 配置注册了全局yyyyMMdd格式：

Java
Kotlin

@Configuration
public class AppConfig {

	@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 AppConfig {

	@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)
		}
	}
}

如果您更喜欢基于 XML 的配置，可以使用FormattingConversionServiceFactoryBean。以下示例展示了如何操作：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans
		https://www.springframework.org/schema/beans/spring-beans.xsd">

	<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>
</beans>

请注意，在 Web 应用程序中配置日期和时间格式时，需要额外考虑。请参阅WebMVC 转换和格式化或WebFlux 转换和格式化。