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>