Jackson序列化JAXB对象会产生奇怪的结果

我有一个JAXB对象。当我序列化它时，结果很有趣！像这样=>

{"formData":{
"preConditions":{
    "acceptTermsAndConditions":"<?xml version=\"1.0\" encoding=\"UTF-16\"?>\n<acceptTermsAndConditions>true</acceptTermsAndConditions>",
    "receivePromoEmail":"<?xml version=\"1.0\" encoding=\"UTF-16\"?>\n<receivePromoEmail>false</receivePromoEmail>"
}, etc...

其中，上面的Premissions类由JAXB2 XJC生成。以下是一个片段：-

@XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(name = "", propOrder = {
        "acceptTermsAndConditions",
        "receivePromoEmail"
    })
    public static class PreConditions {

        @XmlElement(required = true)
        protected Object acceptTermsAndConditions;
        @XmlElement(required = true)
        protected Object receivePromoEmail;

        /**
         * Gets the value of the acceptTermsAndConditions property.
         * 
         * @return
         *     possible object is
         *     {@link Object }
         *     
         */
        public Object getAcceptTermsAndConditions() {
            return acceptTermsAndConditions;
        }

        /**
         * Sets the value of the acceptTermsAndConditions property.
         * 
         * @param value
         *     allowed object is
         *     {@link Object }
         *     
         */
        public void setAcceptTermsAndConditions(Object value) {
            this.acceptTermsAndConditions = value;
        }

        /**
         * Gets the value of the receivePromoEmail property.
         * 
         * @return
         *     possible object is
         *     {@link Object }
         *     
         */
        public Object getReceivePromoEmail() {
            return receivePromoEmail;
        }

        /**
         * Sets the value of the receivePromoEmail property.
         * 
         * @param value
         *     allowed object is
         *     {@link Object }
         *     
         */
        public void setReceivePromoEmail(Object value) {
            this.receivePromoEmail = value;
        }

    }

---

关于JSON为何如此疯狂，有什么线索吗？

因为acceptTermsAndConditions的标称类型是java.lang.Object，所以很难知道到底发生了什么。序列化程序将根据序列化时的运行时类型进行选择-我猜它将是DOM文档。 在反序列化时，它不会工作得太好，只会变成java.util.Map

因此，您可能需要更改模式以生成更具体的类型：使用java.lang.Object的任何内容都可能导致问题

---

您可能希望在序列化之前查看对象的实际Java类型。这应该可以解释奇怪的输出从何而来。我不认为它可以是简单的布尔值。

这还不够信息：您可以添加应用程序类型的定义吗？我猜acceptTermsAndConditions和receivePromoEmail的类型是DOM文档之类的-这些不是POJO类型，只能序列化为原始字符串。根据请求使用有关应用程序类型的信息进行更新。啊。现在，问题出在Application.FormData中，奇怪的JSON就在这里。你能再加一点吗？我仍然认为类型被声明为DOM元素或其他特定于XML的类型，除了按要求转储XML.Added Application.FormData之外，无法以其他方式处理这些类型。您看看您的数据，了解我为什么要求这些类型如何。。。答案就在这里，匹配嵌入XML.StaxMan的字段-感谢您的见解。不幸的是，我无法更改模式。我查看了运行时类型，它是org.apache.xerces.dom.ElementNSImpl，因此我通过为这种类型编写自定义序列化程序解决了我的问题。我有点惊讶，Jackson实现没有包含这个序列化程序，因为这是XJC在模式中没有指定类型时生成的默认类型。Jackson不是JAXB实现，所以它能做的最好的事情是将它序列化为字符串，它确实包含DOM元素的序列化程序。基本上，DOM元素只是另一种外来数据类型。如果您想将自定义序列化程序转换为JSON结构，则自定义序列化程序是有意义的。

    Application application = (Application) JAXBUtil.getXMLAsApplication();
    ObjectMapper mapper = new ObjectMapper();
    AnnotationIntrospector introspector = new JaxbAnnotationIntrospector(TypeFactory.defaultInstance());
    // make deserializer use JAXB annotations (only)
    mapper.getDeserializationConfig().with(introspector);
    // make serializer use JAXB annotations (only)
    mapper.getSerializationConfig().with(introspector);


    try {
        mapper.writeValue(new File("application.json"), application);
    } catch (IOException e) {
        e.printStackTrace();
    }

@XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(name = "", propOrder = {
        "acceptTermsAndConditions",
        "receivePromoEmail"
    })
    public static class PreConditions {

        @XmlElement(required = true)
        protected Object acceptTermsAndConditions;
        @XmlElement(required = true)
        protected Object receivePromoEmail;

        /**
         * Gets the value of the acceptTermsAndConditions property.
         * 
         * @return
         *     possible object is
         *     {@link Object }
         *     
         */
        public Object getAcceptTermsAndConditions() {
            return acceptTermsAndConditions;
        }

        /**
         * Sets the value of the acceptTermsAndConditions property.
         * 
         * @param value
         *     allowed object is
         *     {@link Object }
         *     
         */
        public void setAcceptTermsAndConditions(Object value) {
            this.acceptTermsAndConditions = value;
        }

        /**
         * Gets the value of the receivePromoEmail property.
         * 
         * @return
         *     possible object is
         *     {@link Object }
         *     
         */
        public Object getReceivePromoEmail() {
            return receivePromoEmail;
        }

        /**
         * Sets the value of the receivePromoEmail property.
         * 
         * @param value
         *     allowed object is
         *     {@link Object }
         *     
         */
        public void setReceivePromoEmail(Object value) {
            this.receivePromoEmail = value;
        }

    }