Spring MVC Jackson：动态Json序列化

2023年11月11日 372次阅读

我正在使用
Spring MVC 3.0.5和Jackson 1.7.2.

我希望实现一个Dynamic Bean序列化器赋值机制,例如,假设我的MVC Controller返回(@ResponseBody)一个MyObject类型的Object.默认情况下,Jackson的SerializerFactory将寻找最合适的Serializer,包括我的自定义Serializers(例如CustomSerializer扩展JsonSerializer< MyObject>).

但是,我希望在某些标志处于活动状态时触发我的自定义序列化程序(假设一个布尔变量附加到ThreadLocal).否则,我想使用Jackson提供的Serializers,保持MappingJacksonHttpMessageConverter的默认行为不变.

有没有办法实现这个方法？

我已经在Spring的< mvc：annotaion-driven />中注册了我自己的ObjectMapper,SerializerFactory和CustomSerializers.默认MappingJacksonHttpMessageConverter.

public class ConvertingPostProcessor implements BeanPostProcessor {

    private ObjectMapper jacksonJsonObjectMapper;

    public Object postProcessBeforeInitialization(Object bean, String name)
            throws BeansException {
        if (bean instanceof AnnotationMethodHandlerAdapter) {
            HttpMessageConverter<?>[] convs = ((AnnotationMethodHandlerAdapter) bean).getMessageConverters();
            for (HttpMessageConverter<?> conv: convs) {
                if (conv instanceof MappingJacksonHttpMessageConverter) {
                    ((MappingJacksonHttpMessageConverter) conv).setObjectMapper(jacksonJsonObjectMapper);
                }
            }
        }
        return bean;
    }

    public Object postProcessAfterInitialization(Object bean, String name)
            throws BeansException {
        return bean;
    }

    public void setJacksonJsonObjectMapper(ObjectMapper jacksonJsonObjectMapper) {
        this.jacksonJsonObjectMapper = jacksonJsonObjectMapper;
    }
}

而spring-mvc.xml将是：

<mvc:annotation-driven />
...
    <bean id="jacksonJsonObjectMapper" class="org.mycode.serialize.CustomObjectMapper">
        <property name="customSerializerFactory" ref="jacksonJsonCustomSerializerFactory" />
    </bean>

    <bean id="jacksonJsonCustomSerializerFactory" class="org.mycode.serialize.CustomSerializerFactoryRegistry">
        <property name="serializers">
            <map>
                <entry key="org.mycode.domain.MyObject" value-ref="customSerializer" />         
            </map>
        </property>
    </bean>

    <bean id="customSerializer" class="org.mycode.serialize.CustomSerializer">
        <property name="jacksonJsonCustomSerializerFactory" ref="jacksonJsonCustomSerializerFactory" />
    </bean>

    <bean id="convertingPostProcessor" class="org.mycode.serialize.ConvertingPostProcessor">
        <property name="jacksonJsonObjectMapper" ref="jacksonJsonObjectMapper" />
    </bean>

提前致谢！！

最佳答案 杰克逊库现在还不够成熟.所以渲染模型对象有问题.它提供了一些注释和过滤器来自定义渲染的json但是还不够.所以我建议你只使用
dozer为视图创建新的java类并将域对象映射到这个视图类framework end在responsebody中返回此视图类.

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