Jackson在序列化为JSON时无法考虑@XmlElement

Question

我有一个合同类，其中包含带有@XmlElement标记的元素。 对于前者

 @XmlElement(name = "balancemoney")
 protected Amount balanceMoney;

使用JAXBContext，我能够使用适当的标签生成xml。

但是，当我使用jackson提供的库时，JSON标记仍然以'balanceMoney'而不是'balancemoney'形式出现

如何告诉Jackson考虑@XmlElement标记。

下面是执行此操作的代码。

    //Function to display request object.
public void displayXML(Object reqResp){
    try{
        JAXBContext jaxbContext = JAXBContext.newInstance(reqResp.getClass());
        Marshaller jaxbMarshaller = jaxbContext.createMarshaller();

        // output pretty printed
        jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

        ByteArrayOutputStream bStream=new ByteArrayOutputStream();

        //jaxbMarshaller.marshal(reqResp, System.out);
        jaxbMarshaller.marshal(reqResp,bStream );

        logger.info(bStream.toString());    

        }catch(JAXBException e){
            logger.info(e.getMessage());
        }
        logger.info("*** Payload is: " + reqResp.toString());
}

//Function to display as JSON
public void displayJSON(Object reqResp) throws JsonGenerationException, JsonMappingException, IOException{
    ObjectMapper mapper = new ObjectMapper();
    logger.info(mapper.defaultPrettyPrintingWriter().writeValueAsString(reqResp));

}

Answer 1

• Maven依赖--pom.xml：

   <dependency> <groupId>com.fasterxml.jackson.module</groupId> <artifactId>jackson-module-jaxb-annotations</artifactId> <version>2.6.1</version> </dependency> 

• 自定义ObjectMapper配置（取消注释所有注释以在Spring中将此映射器注册为默认值）：

   //@Configuration public class JacksonConfig { //@Primary //@Bean public static ObjectMapper createCustomObjectMapper() { ObjectMapper mapper = new ObjectMapper(); AnnotationIntrospector aiJaxb = new JaxbAnnotationIntrospector(TypeFactory.defaultInstance()); AnnotationIntrospector aiJackson = new JacksonAnnotationIntrospector(); // first Jaxb, second Jackson annotations mapper.setAnnotationIntrospector(AnnotationIntrospector.pair(aiJaxb, aiJackson)); return mapper; } } 

• 要显示为JSON的代码：

   public void displayJSON(Object reqResp) throws JsonProcessingException{ ObjectMapper mapper = JacksonConfig.createCustomObjectMapper(); LOG.info(mapper.writeValueAsString(reqResp)); } 

Answer 2

根据Jackson使用JAXB注释 ： 启用JAXB注释支持 ，您需要设置mapper.getDeserializationConfig().setAnnotationIntrospector(new JaxbAnnotationIntrospector()); 使Jackson能够使用JAXB注释。