java - 无法使用 jackson 将 xml 绑定到 pojo，com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException：无法识别的字段

Question

当我尝试使用 jackson 将 xml 响应绑定到 POJO 时，我希望使用 getter 获取值。但我得到错误一个错误。我尝试搜索此内容，但找不到相关信息。大多数人建议使用忽略。但是我不能因为我期待那个领域。我的 pojo 如下所示。

public class Consumer {
    private String xmlns;
    private String version;
    private Info info;
    private Status status;

    public Status getStatus() {
        return status;
    }

    public void setStatus(Status status) {
        this.status = status;
    }

    public Info getInfo() {
        return info;
    }

    public void setInfo(Info info) {
        this.info = info;
    }

    public String getXmlns() {
        return xmlns;
    }

    public void setXmlns(String xmlns) {
        this.xmlns = xmlns;
    }

    public String getVersion() {
        return version;
    }

    public class Info {
        private String state;
        private String id;
        private String shopId;
        private String time;

        public String getState() {
            return state;
        }

        public void setState(String state) {
            this.state = state;
        }

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }

        public String getShopId() {
            return shopId;
        }

        public void setShopId(String shopId) {
            this.shopId = shopId;
        }

        public String getTime() {
            return time;
        }

        public void setTime(String time) {
            this.time = time;
        }


    public class Status {
        private Response response;

        public Response getResponse() {
            return response;
        }

        public void setResponse(Response response) {
            this.response = response;
        }


    public class Response {
        private String value;
        private int statusCode;
        private String messageCode;

        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
        }

        public int getStatusCode() {
            return statusCode;
        }

        public void setStatusCode(int statusCode) {
            this.statusCode = statusCode;
        }

        public String getMessageCode() {
            return messageCode;
        }

        public void setMessageCode(String messageCode) {
            this.messageCode = messageCode;
        }


    public class Temp {

        public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, JAXBException {
            readXml();
        }

        public static void readXml() throws IOException, SAXException, ParserConfigurationException, JAXBException {
            String xmlString = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
                    "<Consumer xmlns=\"http://www.someurl.com\" version=\"1.5\">\n" +
                    "   <Info state=\"CA\">\n" +
                    "      <Id>160c464da1ad89a2fec50436</Id>\n" +
                    "      <ShopId>1234</ShopId>\n" +
                    "      <time>2019-08-22T23:13:47.909-04:00</time>\n" +
                    "   </Info>\n" +
                    "   <Status>\n" +
                    "      <Response value=\"Success\" statusCode=\"3456\" messageCode=\"Request processed successfully\" />\n" +
                    "   </Status>\n" +
                    "</Consumer>";

            XmlMapper xmlMapper = new XmlMapper();
            Consumer consumer = xmlMapper.readValue(xmlString, Consumer.class);

            System.out.println("Shop id "+consumer.getInfo().getShopId());

        }

    Exception in thread "main" com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "Info" (class com.motivatedmind.api.stackoverflow.Consumer), not marked as ignorable (3 known properties: "version", "xmlns", "info"])
     at [Source: (StringReader); line: `enter code here`3, column: 21] (through reference chain: com.motivatedmind.api.stackoverflow.Consumer["Info"])
        at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:61)
        at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:823)
        at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:1153)
        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1589)
        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1567)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:294)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151)
        at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4014)
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3005)

标签： javaxmljackson-dataformat-xml

Answer 1

我怀疑问题出在 XML 字符串本身。

将 更改<Consumersumer>为<Consumer>，这应该可以。

----------------------- 更新后---------

为什么state是作为属性传递给 XML 标记“信息”..？它应该与<Info>您的 POJO 类的实例值相匹配Info.java。

状态是 POJO 中的实例变量，但不是标签中的子<info>标签。

String xmlString = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
            "<Consumer xmlns=\"http://www.someurl.com\" version=\"1.5\">\n" +
            "   <Info>\n" +
            "      <State>CA</State>\n" +
            "      <Id>160c464da1ad89a2fec50436</Id>\n" +
            "      <ShopId>1234</ShopId>\n" +
            "      <time>2019-08-22T23:13:47.909-04:00</time>\n" +
            "   </Info>\n" +
            "   <Status>\n" +
            "      <Response value=\"Success\" statusCode=\"3456\" messageCode=\"Request processed successfully\" />\n" +
            "   </Status>\n" +
            "</Consumer>";

尝试这个..！！

----------------- 更新后的评论---------

当您从其他服务获取数据（xml 字符串）时。您可以更改模型对象以与 xml 数据匹配。

为此，您可以在 pojo@XmlAttribute中的字段设置方法上使用注释。state

有关更多参考，您可以查看此答案