無法使用傑克遜，com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException將xml綁定到pojo：無法識別的字段

Question

當我嘗試使用jackson將xml響應綁定到POJO時，我會使用getter獲取值。 但是我得到一個錯誤。 我嘗試搜索有關此內容，但找不到相關信息。 大多數人建議使用忽略。 但是我不能因為我期望這個領域。 我的pojos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)

Answer 1

我懷疑問題出在XML字符串本身。

將<Consumersumer>更改為<Consumer> ，這應該起作用。

-----------------------更新后---------

為什么將state作為屬性傳遞給XML標簽'Info'..？ 它應與<Info>的子項匹配，作為POJO類Info.java實例值。

狀態是POJO中的實例變量，但不是<info>標記中的子標記。

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>";

嘗試這個..！！

-----------------評論后更新---------

從其他服務獲取數據（xml字符串）時。您可以更改模型對象以與xml數據匹配。

為此，可以在pojo中的state字段的setter方法上使用注解@XmlAttribute 。

有關更多參考，您可以看到此答案