java是由：com引起的。fasterxml。杰克逊。数据绑定。exc.UnrecognizedPropertyException:无法识别的字段“状态”

Question

我收到以下错误消息，我有状态类，但未被识别。我不知道如何继续，也无法在网上找到答案

错误

   org.springframework.http.converter.HttpMessageNotReadableException: Could 
   not read JSON: Unrecognized field "Status" (class 
   com.myproject.ticket.EventsResponse), not marked as ignorable (3 known 
   properties: "events", "status", "page"])
      ....
   Caused by: 
   com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: 
   Unrecognized field "Status" (class com.myproject.ticket.EventsResponse), 
   not marked as ignorable (3 known properties: "events", "status", "page"])

事件响应

@XmlRootElement(name = "EventsResponse")
@XmlAccessorType(XmlAccessType.FIELD)
public class EventsResponse {
    @XmlElement(name = "Status")
    private Status status;
    @XmlElement(name = "Paging")
    private Page page;
    @XmlElementWrapper(name="Events")
    @XmlElement(name = "Event")
    private List<Event> events;

    .....

状态

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Status {
    @XmlElement(name = "Version")
    private double version;
    @XmlElement(name = "TimeStampUtc")
    private Date timeStampUtc;
    @XmlElement(name = "Code")
    private int code;
    @XmlElement(name = "Message")
    private String message;
    @XmlElement(name = "Details")
    private String details;

响应

<EventsResponse xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    <Status>
        <Version>2.0</Version>
        <TimeStampUtc>2016-06-11T09:32:21</TimeStampUtc>
        <Code>0</Code>
        <Message>Success</Message>
        <Details />
    </Status>
    <Paging>
        <PageNumber>1</PageNumber>
        <PageSize>50</PageSize>
        <PageResultCount>15</PageResultCount>
        <TotalResultCount>15</TotalResultCount>
        <TotalPageCount>1</TotalPageCount>
    </Paging>
    <Events>
        <Event>

我将以下内容添加到状态，但仍收到相同的错误

@XmlElement(name = "Status")
@JacksonXmlProperty(localName = "Status")
private Status status;

Answer 1

假设使用Jackson来反序列化XML对象，则有两种选择。最简单的方法是使用Jackson自己的XML注释，而不是或以及JAXB @XmlElement注释。例如：

@XmlElement(name = "Status")
@JacksonXmlProperty(localName = "Status")
private Status status;

（Maven中的@XmlElement注释位于jackson-dataformat-xml包中-版本应与其他Jackson包版本匹配。）

另一种方法是注册一个AnnotationInvestor作为反序列化链的一部分，即（从单元测试中）：

    XmlMapper mapper = new XmlMapper();
    AnnotationIntrospector aiJaxb = new JaxbAnnotationIntrospector(TypeFactory.defaultInstance());
    mapper.setAnnotationIntrospector(aiJaxb);
    // EVENTS_RESPONSE is the incoming XML
    EventsResponse response = mapper.readValue(EVENTS_RESPONSE, EventsResponse.class);

这可以识别@XmlElement注释。例如，如果需要将其作为Spring配置的一部分，那么this answer中有更多详细信息

（为了使用JaxbAnnotationIntrospector类，需要Maven的jackson-module-jaxb-annotation模块。）

Answer 2

我没能重建你的问题

我创建了一个测试项目github here，该项目具有满足您需求的Jackson配置和JAXB注释

我向jackson dataformat xml和woodstox core asl添加了依赖项，作为您的Stax实现（在我的测试项目中，我使用的是jackson 2.6.6.，Spring 4.2.6）

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.6.6</version>
</dependency>
<dependency>
    <groupId>org.codehaus.woodstox</groupId>
    <artifactId>woodstox-core-asl</artifactId>
    <version>4.4.1</version>
</dependency>

将Jackson2ObjectMapperBuilder配置为同时使用Jackson和JAXB注释。这是一个Spring引导示例，可以转换为简单的Spring MVC外观here

@SpringBootApplication
public class EventAppConfiguration {

  public static void main(String[] args) {
       SpringApplication.run(EventAppConfiguration.class, args);
  }

  @Bean
  public Jackson2ObjectMapperBuilder jacksonBuilder() {
      Jackson2ObjectMapperBuilder b = new Jackson2ObjectMapperBuilder();
      b.indentOutput(true)
      //Enable Introspects for both Jackson and JAXB annotation
     .annotationIntrospector(introspector())
      //Use CamelCase naming
     .propertyNamingStrategy(PropertyNamingStrategy.PASCAL_CASE_TO_CAMEL_CASE)
     .dateFormat(new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss"));
      return b;
  }
  @Bean
  public AnnotationIntrospector introspector(){
     AnnotationIntrospector primary = new JacksonAnnotationIntrospector();
     AnnotationIntrospector secondary = new    JaxbAnnotationIntrospector(TypeFactory.defaultInstance());
     AnnotationIntrospector pair =  AnnotationIntrospector.pair(primary, secondary);
    return pair;
 }
}

注意使用

PropertyNamingStrategy.PASCAL_CASE_TO_CAMEL_CASE

它将省去您为首字母大写指定替代命名的需要，并且只需要在扭曲和重命名时使用JAXB注释，例如my Events Response将如下所示：

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class EventsResponse {
       private Status status;
       @XmlElement(name = "Paging")
       private Page page;
       @XmlElementWrapper(name = "Events")
       @XmlElement(name = "Event")
       private List<Event> events;
    ...
}