我试图了解为什么我的spring v.5.0.4-RELEASE无法正确加载默认消息转换器。
我从servlet.xml中删除了所有声明,希望能在spring内找到从AbstractMEssageConverterMethodProcessor正确加载的所有默认转换器,但只能得到以下4个:

org.springframework.http.converter.ByteArrayHttpMessageConverter@35ca138b
org.springframework.http.converter.StringHttpMessageConverter@2b755f0d
org.springframework.http.converter.xml.SourceHttpMessageConverter@74f5d717
org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter@6982b849


有什么线索吗?

最佳答案

我最终了解到问题是由RequestMappingHandlerAdapter bean引起的

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">


这覆盖了Spring默认值,并发布了我的问题中列出的四个转换器。
解决方案是将我要查找的转换器放在如下所示的bean下:

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
    <property name="messageConverters">
        <list>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean
                        class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                        <property name="autoDetectFields" value="true" />
                        <property name="autoDetectGettersSetters" value="false" />
                        <property name="objectMapper">
                            <bean class="com.mypackage.CustomMapper" />
                        </property>
                    </bean>
                </property>
            </bean>
            <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.FormHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/plain;charset=UTF-8</value>
                        <value>text/html</value>
                     </list>
                </property>
            </bean>
        </list>
    </property>
</bean>


annotation-driven下的配置被完全忽略:

<mvc:annotation-driven>
    <mvc:message-converters>
    ...
    </mvc:message-converters>
</mvc:annotation-driven>

10-07 19:44
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