如何同时使用基于注解Spring配置文件来配置MappingJacksonHttpMessageConverter？ [英] How to configure MappingJacksonHttpMessageConverter while using spring annotation-based configuration?

问题描述

我是不合理的，足以走进通过注释，而不是纯粹的XML配置豆类豆类春，现在我面临的后果。

I was unreasonable enough to went into configuring spring beans via annotations and not pure xml beans and now I'm facing the consequences.

我配置使用REST渠道

I configure REST channels using

<mvc:annotation-driven />

现在我想简单的配置 MappingJacksonHttpMessageConverter 来输出JSON仅此领域具有非空值。我已经试过如下：

Now I want simply configure the MappingJacksonHttpMessageConverter to output to JSON only this fields that have non-null values. I've tried the following:

<bean id="jsonHttpMessageConverter"
    class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
    <property name="prefixJson" value="false" />
    <property name="supportedMediaTypes" value="application/json" />
    <property name="objectMapper">
        <bean class="org.codehaus.jackson.map.ObjectMapper">
            <property name="serializationInclusion" value="NON_NULL"/>
        </bean>
    </property>
</bean>

豆被创建，但是创建并在信道使用的转换器的另一实例。所以，我已经试过的方式与 @Configuration 和 @Bean 中所描述的this计算器问题，但仍JSON序列化使用其自己的配置。

The beans gets created, but another instance of converter is created and used in channels. So I've tried the way with @Configuration and @Bean described in this Stackoverflow question, but still json serialization uses its own configuration.

最后，我试图注入映射器通过

Finally I've tried to inject the mapper via

@Autowired
private MappingJacksonHttpMessageConverter jacksonConverter;

但我已经对 NoSuchBeanDefinitionException 结束。所以我现在没办法了，所以我问这里的任何想法。如何控制好并配置框架使用的映射？

but I've ended with NoSuchBeanDefinitionException. So now I'm out of options and therefore I'm asking for any ideas here. How to controll and configure the mapper used by framework?

推荐答案

使用的<一个href=\"http://static.springsource.org/spring/docs/current/javadoc-api/org/springframework/web/servlet/config/annotation/WebMvcConfigurer.html#configureMessageConverters(java.util.List)\"><$c$c>WebMvcConfigurer.configureMessageConverters()方法：

配置HttpMessageConverters使用[...]如果没有消息转换器添加到列表中，缺省转换器代替加入

Configure the HttpMessageConverters to use [...] If no message converters are added to the list, default converters are added instead.

使用 @Configuration 您有：

@Configuration
class MvcConf extends WebMvcConfigurationSupport {
    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(converter());
        addDefaultHttpMessageConverters(converters);
    }

    @Bean
    MappingJacksonHttpMessageConverter converter() {
        MappingJacksonHttpMessageConverter converter = new MappingJacksonHttpMessageConverter()
        //do your customizations here...
        return converter;
    }
}

电话 addDefaultHttpMessageConverters（）是必需的，因为使用自定义转换器时的默认设置不被应用。

Call to addDefaultHttpMessageConverters() is required because the defaults are not applied when using custom converters.

重要提示您必须删除 @EnableWebMvc 对于要配置的转换器，如果你扩展WebMvcConfigurationSupport。

IMPORTANT NOTE You must remove @EnableWebMvc for your converters to be configured if you extend WebMvcConfigurationSupport.

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