我收到以下错误消息,我有状态类,但它无法识别。我不知道如何进行,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;
.....
地位
@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>
我在状态中添加了以下内容,但仍然收到相同的错误。
@XmlElement(name = "Status")
@JacksonXmlProperty(localName = "Status")
private Status status;
我未能重建您的问题。
我在这里创建了一个测试项目 github,其中包含满足您需求的 Jackson 配置和 JAXB 注释。
我添加了对jackson-dataformat-xml和woodstox-core-asl的依赖作为您的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 看这里
@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
它将使您无需为首字母大写指定替代命名,并且仅要求将 JAXB 注释用于扭曲和重命名,例如我的 EventsResponse 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;
...
}
您有两个选择,假设您使用 Jackson 反序列化 XML 对象。最简单的方法是使用 Jackson 自己的 XML 注释,而不是 JAXB @XmlElement
注释。例如:
@XmlElement(name = "Status")
@JacksonXmlProperty(localName = "Status")
private Status status;
(@XmlElement
注释位于 Maven 的jackson-dataformat-xml
包中 - 该版本应与您的其他 Jackson 包版本匹配。
另一种方法是将 AnnotationIntrospector 注册为反序列化链的一部分 - 即。(来自单元测试):
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);
这将识别@XmlElement
注释。例如,如果您需要将其作为 Spring 配置的一部分包含在内,则此答案中有更多细节。
(为了使用 JaxbAnnotationIntrospector
类,您将需要 Maven 的 jackson-module-jaxb-annotation
模块。