conversion-service-优快云博客

本文介绍Spring MVC中mvc:annotation-driven的conversion-service配置细节，包括默认转换服务DefaultFormattingConversionService的注册过程及其内置的多种类型转换器，如Number、String、Collection等类型的相互转换。

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Spring-mvc.xsd关于mvc:annotation-driven的conversion-service定义

The bean name of the ConversionService that is to be used for type conversion during field binding. This attribute is not required, and only needs to be specified if custom converters need to be configured. If not specified, a default FormattingConversionService is registered with converters to/from common value types.

org.springframework.format.support.FormattingConversionService

org.springframework.format.support.DefaultFormattingConversionService

public DefaultFormattingConversionService(StringValueResolver embeddedValueResolver, boolean registerDefaultFormatters) {
setEmbeddedValueResolver(embeddedValueResolver);
DefaultConversionService.addDefaultConverters(this);
if (registerDefaultFormatters) {
addDefaultFormatters(this);
}
}

org.springframework.core.convert.support.DefaultConversionService

public static void addDefaultConverters(ConverterRegistry converterRegistry) {
addScalarConverters(converterRegistry);
addCollectionConverters(converterRegistry);

converterRegistry.addConverter(new ByteBufferConverter((ConversionService) converterRegistry));
if (jsr310Available) {
Jsr310ConverterRegistrar.registerJsr310Converters(converterRegistry);
}

converterRegistry.addConverter(new ObjectToObjectConverter());
converterRegistry.addConverter(new IdToEntityConverter((ConversionService) converterRegistry));
converterRegistry.addConverter(new FallbackObjectToStringConverter());
if (javaUtilOptionalClassAvailable) {
converterRegistry.addConverter(new ObjectToOptionalConverter((ConversionService) converterRegistry));
}
}

public static void addCollectionConverters(ConverterRegistry converterRegistry) {
ConversionService conversionService = (ConversionService) converterRegistry;

converterRegistry.addConverter(new ArrayToCollectionConverter(conversionService));
converterRegistry.addConverter(new CollectionToArrayConverter(conversionService));

converterRegistry.addConverter(new ArrayToArrayConverter(conversionService));
converterRegistry.addConverter(new CollectionToCollectionConverter(conversionService));
converterRegistry.addConverter(new MapToMapConverter(conversionService));

converterRegistry.addConverter(new ArrayToStringConverter(conversionService));
converterRegistry.addConverter(new StringToArrayConverter(conversionService));

converterRegistry.addConverter(new ArrayToObjectConverter(conversionService));
converterRegistry.addConverter(new ObjectToArrayConverter(conversionService));

converterRegistry.addConverter(new CollectionToStringConverter(conversionService));
converterRegistry.addConverter(new StringToCollectionConverter(conversionService));

converterRegistry.addConverter(new CollectionToObjectConverter(conversionService));
converterRegistry.addConverter(new ObjectToCollectionConverter(conversionService));

if (streamAvailable) {
converterRegistry.addConverter(new StreamConverter(conversionService));
}
}

private static void addScalarConverters(ConverterRegistry converterRegistry) {
converterRegistry.addConverterFactory(new NumberToNumberConverterFactory());

converterRegistry.addConverterFactory(new StringToNumberConverterFactory());
converterRegistry.addConverter(Number.class, String.class, new ObjectToStringConverter());

converterRegistry.addConverter(new StringToCharacterConverter());
converterRegistry.addConverter(Character.class, String.class, new ObjectToStringConverter());

converterRegistry.addConverter(new NumberToCharacterConverter());
converterRegistry.addConverterFactory(new CharacterToNumberFactory());

converterRegistry.addConverter(new StringToBooleanConverter());
converterRegistry.addConverter(Boolean.class, String.class, new ObjectToStringConverter());

converterRegistry.addConverterFactory(new StringToEnumConverterFactory());
converterRegistry.addConverter(Enum.class, String.class,
new EnumToStringConverter((ConversionService) converterRegistry));

converterRegistry.addConverter(new StringToLocaleConverter());
converterRegistry.addConverter(Locale.class, String.class, new ObjectToStringConverter());

converterRegistry.addConverter(new StringToCharsetConverter());
converterRegistry.addConverter(Charset.class, String.class, new ObjectToStringConverter());

converterRegistry.addConverter(new StringToCurrencyConverter());
converterRegistry.addConverter(Currency.class, String.class, new ObjectToStringConverter());

converterRegistry.addConverter(new StringToPropertiesConverter());
converterRegistry.addConverter(new PropertiesToStringConverter());

converterRegistry.addConverter(new StringToUUIDConverter());
converterRegistry.addConverter(UUID.class, String.class, new ObjectToStringConverter());
}