概述
1 spring数据绑定:http://jinnianshilongnian.iteye.com/blog/1723270
2 springMVC中,HttpMessageConverter<T>和ConversionService之间的区别:http://www.iteye.com/problems/98525
ConversionService是属于spring core部分 所有spring管理的bean等等 都使用它进行类型转换,而它又需要注册一些converter 来完成类型转换。 这个可以看我博客 springmvc部分
HttpMessageConverter 是对http请求/响应 数据进行转换的, 它可以使用ConversionService进行一些转换(HttpMessageConverter是否能转换 还需要根据如请求的contentType等决定).
意思是:HttpMessageConverter 使用ConversionService进行一些转换。
3 官方文档:
In a Spring MVC application, you may configure a custom ConversionService instance explicitly as an attribute of the annotation-driven element of
the MVC namespace. This ConversionService will then be used anytime a type conversion is required during Controller model binding. If not configured
explicitly, Spring MVC will automatically register default formatters and converters for common types such as numbers and dates.
翻译:
在Spring MVC应用程序中,您可以将自定义ConversionService实例显式配置为MVC命名空间的注释驱动元素的属性。 随后在Controller模型绑定期间需要进行类型转换时,将使用此ConversionService。 如果没有明确配置,Spring MVC将自动注册默认格式化程序和转换器,用于常见类型,如数字和日期。
<mvc:annotation-driven/>
With this one-line of configuration, default formatters for Numbers and Date types will be installed, including support for the @NumberFormat and@DateTimeFormat annotations. Full support for the Joda Time formatting library is also installed if Joda Time is present on the classpath.
To inject a ConversionService instance with custom formatters and converters registered, set the conversion-service attribute and then
specify custom converters, formatters, or FormatterRegistrars as properties of the FormattingConversionServiceFactoryBean:
通过这种一行配置,将使用默认“数字和日期”的格式化方法,包括对@NumberFormat和@DateTimeFormat注释的支持。 如果Joda时间存在于类路径上,
则还将完全支持Joda Time格式化库。要注册自定义格式化程序和转换器的ConversionService实例,请设置conversion-service属性,然后将使用自定义converters,
formatters或FormatterRegistrars,作为FormattingConversionServiceFactoryBean的三个属性:
<?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>
总结:
还是这句话,HttpMessageConverter 是对http请求/响应 数据进行转换的, 它可以使用ConversionService进行一些转换。
ObjectToStringHttpMessageConverter(我看的是spring-web-3.2.6.RELEASE.jar和4.3.5版本)里源码:使用了conversionService去转换。
for reading and writing content and a ConversionService for converting the String content to and from the target object type.
By default, this converter supports the media type {@code text/plain} only. This can be overridden through the {@link #setSupportedMediaTypes supportedMediaTypes} property.
最后
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