杰克逊序列化配置

本文介绍了杰克逊序列化配置的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我在Spring 3 MVC应用程序中使用Jackson JSON。为了不序列化每个单独的Date字段，我创建了一个使用特定DateFormat的自定义objectmapper：

I am using Jackson JSON in a Spring 3 MVC app. To not serialize each and every single Date field, I created a custom objectmapper that uses a specific DateFormat:

@Component("jacksonObjectMapper") public class CustomObjectMapper extends ObjectMapper { Logger log = Logger.getLogger(CustomObjectMapper.class); @PostConstruct public void afterProps() { log.info("PostConstruct... RUNNING"); //ISO 8601 getSerializationConfig().setDateFormat(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SZ")); } //constructors... }

此自定义ObjectMapper被注入JsonConverter：

This custom ObjectMapper is injected into the JsonConverter:

<bean id="jsonConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> <property name="supportedMediaTypes" value="application/json" /> <property name="objectMapper" ref="jacksonObjectMapper" /> <!-- defined in CustomObjectMapper --> </bean>

日志和序列化工作中没有例外，但它没有提取日期格式，它简单序列化为时间戳。 @PostConstruct注释有效，方法中的日志语句在日志中。

There is no exception in the logs and serialization works, but it is not picking up the dateformat, it simple serializes to a timestamp. The @PostConstruct annotation works, the log statement in the method is in the logs.

有谁知道为什么会失败？

Does anyone know why this fails?

推荐答案

你也可以需要通过执行以下操作来指定您想要文本日期序列化：

You may also need to specify that you want textual Date serialization, by doing:

configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);

（虽然我假设设置非空日期格式也可能触发它，但可能不会）

(although I was assuming setting non-null date format might also trigger it, but maybe not)

此外，您可以直接从构造函数（这是安全的）配置mapper。并不是说它应该改变行为，而是需要单独的配置方法。

Also, you can do configuration of mapper directly from constructor (which is safe). Not that it should change behavior, but would remove need for separate configuration method.