jackson jaxb注释在Spring中得到支持 [英] jackson jaxb annotations support in Spring

问题描述

我正在寻找为jackson添加jaxb注释支持的最简单方法。
杰克逊现在通过< mvc：annotation-driven /> 添加到Spring。我需要通过 @ResponseBody 注释将Object转换为xml或json依赖于媒体类型。
我是spring-mvc的新手，所以不太了解它是如何工作的。谢谢。

i'm looking for the simplest way of adding jaxb annotations support to jackson. Jackson is added now to Spring by <mvc:annotation-driven/>. I need that by @ResponseBody annotation the Object is converted to xml or json dependently to the media type. I'm new in spring-mvc so doesn't understand well yet how things work. Thanks.

推荐答案

好的，我假设您希望能够同时返回XML和JSON。为此，您需要为两种格式创建 MessageConverter 。

Okay, I assume you want to be able to return both XML and JSON. To do this you need to create MessageConverters for both formats.

XML消息转换器：

<bean id="xmlConverter"
    class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
    <constructor-arg>
        <oxm:jaxb2-marshaller id="jaxb2Marshaller">
            <!-- you must either bind your JAXB annotated classes here -->
            <!-- OR provide a jaxb.index and use contextPath -->
            <oxm:class-to-be-bound name="com.mycompany.MyClass"/>
        </oxm:jaxb2-marshaller>
    </constructor-arg>
    <property name="supportedMediaTypes">
        <list>
            <bean class="org.springframework.http.MediaType">
                <constructor-arg index="0" value="application"/>
                <constructor-arg index="1" value="xml"/>
                <constructor-arg index="2" value="UTF-8"/>
            </bean>
        </list>
    </property>
</bean>

JSON消息转换器，它使用JAXB注释：

The JSON message converter, which uses the JAXB annotations:

<bean id="jaxbAnnotationInspector"
    class="org.codehaus.jackson.xc.JaxbAnnotationIntrospector"/>
<bean id="jacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper">
    <property name="annotationIntrospector" ref="jaxbAnnotationInspector"/>
</bean>
<bean id="jsonConverter"
    class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
    <property name="objectMapper">
        <bean ref="jacksonObjectMapper"/>
    </property>
    <property name="supportedMediaTypes">
        <list>
            <bean class="org.springframework.http.MediaType">
                <constructor-arg index="0" value="application"/>
                <constructor-arg index="1" value="json"/>
                <constructor-arg index="2" value="UTF-8"/>
            </bean>
        </list>
    </property>
</bean>

最后， AnnotationMethodHandlerAdapter ，这将是将响应转换为适当的内容类型，具体取决于接受标头：

And finally, the AnnotationMethodHandlerAdapter, which will convert the responses to the appropriate content type, depending upon the accept headers:

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <ref bean="xmlConverter"/>
            <ref bean="jsonConverter"/>
        </list>
    </property>
</bean>

请注意，jackson中的JAXB支持不是100％完整或正确，但是开发人员非常善于修复错误并响应错误报告。

Note that the JAXB support in jackson isn't 100% complete or correct all the time, but the developers are really good at fixing bugs and responding to error reports.

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