21.16.3 转换与格式化

数字的Number类型和日期Date类型的格式化是默认安装了的,包括@NumberFormat注解和@DateTimeFormat注解。如果classpath路径下存在Joda Time依赖,那么完美支持Joda Time的时间格式化库也会被安装好。如果要注册定制的格式化器或转换器,请覆写addFormatters方法:

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addFormatters(FormatterRegistry registry) {
        // Add formatters and/or converters
    }

}

使用MVC命名空间时,<mvc:annotation-driven>也会进行同样的默认配置。要注册定制的格式化器和转换器,只需要提供一个转换服务ConversionService

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

    <mvc:annotation-driven conversion-service="conversionService"/>

    <bean id="conversionService"
            class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="org.example.MyConverter"/>
            </set>
        </property>
        <property name="formatters">
            <set>
                <bean class="org.example.MyFormatter"/>
                <bean class="org.example.MyAnnotationFormatterFactory"/>
            </set>
        </property>
        <property name="formatterRegistrars">
            <set>
                <bean class="org.example.MyFormatterRegistrar"/>
            </set>
        </property>
    </bean>

</beans>

关于如何使用格式化管理器FormatterRegistrar,请参考 8.6.4 FormatterRegistrar SPI一节,以及FormattingConversionServiceFactoryBean的文档。

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