我在哪里指定Spring 3.1中的Jackson SerializationConfig.Feature设置 [英] Where do I specify Jackson SerializationConfig.Feature settings in Spring 3.1

问题描述

我很困惑为什么使用默认包含的jackson，Spring似乎已经定制了默认的Jackson配置。

I'm puzzled as to why using a default inclusion of jackson that Spring seems to have customised the default Jackson configuration.

其中一个令人烦恼的设置是 WRITE_DATES_AS_TIMESTAMPS ，杰克逊默认为 true 然而Spring在某处将此更改为 false 并且还提供了日期格式。

One setting it's messing with is WRITE_DATES_AS_TIMESTAMPS, the Jackson default is true however Spring has somewhere changed this to false and also provided a date format.

世界上哪里这是怎么回事？我希望我的日期保持序列化为数字。

Where in the world is this happening? I want my dates to remain serialised as numbers.

UPDATE ：原来这不是导致问题的春天，它实际上是休眠代理类造成的问题。出于某种原因，如果hibernate的类型映射为 type =date，它会序列化为日期字符串，但是如果它的 type =timestamp 按预期顺序排列。而不是花太多时间研究这个，我决定暂时将我的所有映射都改为时间戳。

UPDATE: Turns out it's not spring that's causing the problem, it's actually hibernates proxy classes causing the problem. For some reason if hibernate has a type-mapping of type="date" it serialises as a date string, though if its type="timestamp" it serialises as expected. Rather than spend too much time looking into this I've decided to just change all my mappings to timestamp for now.

推荐答案

开始使用3.1 M1，您可以通过 mvc：annotation-driven 的子元素注册 HttpMessageConverters 来指定jackson自定义配置。

Starting with 3.1 M1 you can specify jackson custom configuration by registering an HttpMessageConverters through a sub-element of mvc:annotation-driven.

参见 Spring 3.1 MVC命名空间改进

参见 SPR-7504 更容易添加新内容消息转换器到AnnotationMethodHandlerAdapter

See SPR-7504 Make it easier to add new Message Converters to AnnotationMethodHandlerAdapter

例如：

<bean id="jacksonObjectMapper" class="x.y.z.CustomObjectMapper">                
</bean>

<mvc:annotation-driven>
    <mvc:message-converters>
       <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
           <property name="objectMapper" ref="jacksonObjectMapper" />
       </bean>
       </mvc:message-converters>
</mvc:annotation-driven>

CustomObjectMapper对象

The CustomObjectMapper Object

    @Component("jacksonObjectMapper")
    public class CustomObjectMapper extends ObjectMapper {

        @PostConstruct
        public void afterPropertiesSet() throws Exception {

            SerializationConfig serialConfig = getSerializationConfig()     
                        .withDateFormat(null);

                  //any other configuration

            this.setSerializationConfig(serialConfig);
        }
    }

< a href =http://jackson.codehaus.org/1.9.4/javadoc/org/codehaus/jackson/map/SerializationConfig.html#withDateFormat%28java.text.DateFormat%29 =noreferrer> SerializationConfig。 withDateFormat

SerializationConfig .withDateFormat

除了使用指定的日期格式构建实例外，还将启用或禁用
Feature.WRITE_DATES_AS_TIMESTAMPS（如果格式设置则启用as null;如果非null则禁用）

In addition to constructing instance with specified date format, will enable or disable Feature.WRITE_DATES_AS_TIMESTAMPS (enable if format set as null; disable if non-null)

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