Question

我有一个包含@XmlElement标记元素的合约类。对于前

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

使用JAXBContext我可以用适当的标签生成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。

以下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

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

Answer 2

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;
    }
}

显示为JSON的代码：

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

Jackson在序列化为JSON时无法考虑@XmlElement

2 个答案: