使用RestTemplate时如何配置内部Jackson映射器?
我想更新Spring RestTemplate所使用的jackson映射器的SerializationConfig.Feature …属性,任何想法都知道如何获得它或在哪里可以/应该对其进行配置。
回答:
默认RestTemplate
构造函数注册一组HttpMessageConverter
:
this.messageConverters.add(new ByteArrayHttpMessageConverter());this.messageConverters.add(new StringHttpMessageConverter());
this.messageConverters.add(new ResourceHttpMessageConverter());
this.messageConverters.add(new SourceHttpMessageConverter());
this.messageConverters.add(new XmlAwareFormHttpMessageConverter());
if (jaxb2Present) {
this.messageConverters.add(new Jaxb2RootElementHttpMessageConverter());
}
if (jacksonPresent) {
this.messageConverters.add(new MappingJacksonHttpMessageConverter());
}
if (romePresent) {
this.messageConverters.add(new AtomFeedHttpMessageConverter());
this.messageConverters.add(new RssChannelHttpMessageConverter());
}
该MappingJacksonHttpMessageConverter
轮流,造成ObjectMapper
直接实例。你可以找到该转换器并替换ObjectMapper
或注册一个新的转换器。这应该工作:
@Beanpublic RestOperations restOperations() {
RestTemplate rest = new RestTemplate();
//this is crucial!
rest.getMessageConverters().add(0, mappingJacksonHttpMessageConverter());
return rest;
}
@Bean
public MappingJacksonHttpMessageConverter mappingJacksonHttpMessageConverter() {
MappingJacksonHttpMessageConverter converter = new MappingJacksonHttpMessageConverter();
converter.setObjectMapper(myObjectMapper());
return converter;
}
@Bean
public ObjectMapper myObjectMapper() {
//your custom ObjectMapper here
}
在XML中,遵循以下原则:
<bean id="restOperations" class="org.springframework.web.client.RestTemplate"> <property name="messageConverters">
<util:list>
<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
<bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
<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"/>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="objectMapper" ref="customObjectMapper"/>
</bean>
</util:list>
</property>
</bean>
<bean id="customObjectMapper" class="org.codehaus.jackson.map.ObjectMapper"/>
请注意,转换并不是真正的1:1-我必须显式地messageConverters
以XML 创建列表,而采用@Configuration
这种方法,我可以引用现有列表并直接对其进行修改。但这应该可行。
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