配置文件前面加入如下结构，版本号3.2.5
<bean
class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<bean
class="org.springframework.http.converter.ByteArrayHttpMessageConverter" />
<bean
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/plain;charset=UTF-8</value>
</list>
</property>
</bean>
<bean
class="org.springframework.http.converter.ResourceHttpMessageConverter" />
<bean
class="org.springframework.http.converter.xml.SourceHttpMessageConverter" />
<bean
class="org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter" />
<bean
class="org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter" />
</list>
</property>
</bean>