在Spring 4.1.3中注册ObjectMapper以序列化Joda DateTime [英] Register ObjectMapper in Spring 4.1.3 to serialize Joda DateTime

问题描述

我正在尝试在我的Web应用程序中配置ObjectMapper，以序列化/排序方式显示Joda的DateTime，以ISO 8601格式显示。我发现有用的库 jackson-datatype-joda ，它的模块 JodaModule 所以我添加了依赖关系：

 <依赖关系> 
< groupId> com.fasterxml.jackson.datatype< / groupId> 
< artifactId> jackson-datatype-joda< / artifactId> 
< version> 2.4.4< / version> 
< / dependency> 
  

我的弹簧配置：

 < bean id =objectMapper
 class =org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean
p：indentOutput =true> 
 
< property name =featuresToDisable> 
< array> 
< util：constant static-field =com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS/> 
< / array> 
< / property> 
 
< property name =modulesToInstallvalue =com.fasterxml.jackson.datatype.joda.JodaModule/> 
< / bean> 
 
< mvc：注释驱动> 
< mvc：message-converters> 
< bean class =org.springframework.http.converter.json.MappingJackson2HttpMessageConverter> 
< property name =objectMapperref =objectMapper/> 
< / bean> 
< / mvc：message-converters> 
< / mvc：注释驱动> 
  

当我尝试序列化这个bean

  public class Bean {
 private DateTime start = new DateTime（）; 
 
 public DateTime getStart（）{return start; } 
 public void setStart（DateTime start）{this.start = start; 
} 
  

我得到以下输出，但是希望它在ISO 8601格式：

{开始：1418337158933}

我发现如果在classpath中找到了 JodaModule 也可以预加载，所以不需要手动注册它（请参阅 github repo ），但这个代码在应用程序启动期间被调用了很多次。

我认为原因是 ObjectMapper 被实例化在某些其他地方。

更新：问题是，在声明了ObjectMapper的Spring配置中还有一个文件。答案中提供的两个解决方案都可以正常工作。干杯！

解决方案

如果您在下面的代码中创建自定义的ObjectMapper类，它将覆盖默认的objectMapper，并且不需要您的xml配置完全是：

  @Service 
 public class CustomObjectMapper extends ObjectMapper {
 public CustomObjectMapper {
 this.configure（SerializationFeature.WRITE_DATES_AS_TIMESTAMPS，false）; 
 this.registerModule（new JodaModule（））; 
} 
} 
  

我将这个简单的服务添加到简单的弹簧启动应用程序并获得预期格式的时间。

I'm trying to configure ObjectMapper in my Web application to serialize/deserialise dates presented as Joda's DateTime in ISO 8601 format. I found useful library jackson-datatype-joda and it's module JodaModule so I've added dependency:

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-joda</artifactId>
    <version>2.4.4</version>
</dependency>

My Spring configuration:

<bean id="objectMapper"
    class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"
    p:indentOutput="true">

    <property name="featuresToDisable">
        <array>
            <util:constant static-field="com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS" />
        </array>
    </property>

    <property name="modulesToInstall" value="com.fasterxml.jackson.datatype.joda.JodaModule" /> 
</bean>

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="objectMapper" ref="objectMapper" />
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

When I try to serialize this bean

public class Bean {
    private DateTime start = new DateTime();

    public DateTime getStart() { return start; }
    public void setStart(DateTime start) { this.start = start; }        
}

I get following output as long but instead want it to be in ISO 8601 format:

{"start":1418337158933}

I found that JodaModule also preloads if it is found in classpath so it is not neccessary to register it manually (see github repo) but this code is invoked many times during application start.

I think the reason is that ObjectMapper is instantiated in some other place.

UPDATE: The problem was that there was one more file with Spring configuration where ObjectMapper was declared. Both solutions given in answers will work. Cheers!

解决方案

If you create you custom ObjectMapper class like in the code below it will override default objectMapper and you don't need your xml configuration at all:

@Service
public class CustomObjectMapper extends ObjectMapper {
    public CustomObjectMapper() {
        this.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        this.registerModule(new JodaModule());
    }
}

I've added this simple service to the simple spring boot application and got time in the expected format.

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