Question

我的问题如下：
jackson desearlization：根目录下的两个键。我如何打开一个而忽略另一个？
我希望在不使用this question中解决的包装类的情况下解决此问题我正在开发一个球衣客户端应用程序。我配置了一个jackson数据绑定与球衣整合。

Map<Class<?>, Class<?>> mixins = new HashMap<Class<?>, Class<?>>();
    mixins.put(Set.class, CollectionMixIn.class);
    return new ObjectMapper()
            .configure(SerializationFeature.WRAP_ROOT_VALUE, true)
            .configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true)
            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false)
            .setMixIns(mixins);

minxin接口：

@JsonRootName("items")
interface CollectionMixIn {
}

服务器返回如下的json响应：

{"totalCount":6,"items":[{"id":62,"lat":30.2173,"lon":50.186405,"alt":0.0,"imageFileName":"DSC_0410 - Copy (3).JPG","imageFileSize":7671969,"imageFileSizeAsString":"7.32 MB"},{"id":65,"lat":30.2173,"lon":50.186405,"alt":0.0,"imageFileName":"DSC_0410 - Copy.JPG","imageFileSize":7671969,"imageFileSizeAsString":"7.32 MB"}]}

我在泽西客户的帮助下阅读了上述json：

 WebTarget target = webTarget.path("getPics");
 target = target.queryParam("nodeId", 67);
 Invocation.Builder builder =  target.request(MediaType.APPLICATION_JSON_TYPE);
 Set<PicsDetail> res = builder.get(Set.class);

请注意PicsDetail是我的POJO。我想阅读PicsDetail的集合。但是我遇到了这个例外：

 Exception in thread "main" javax.ws.rs.ProcessingException: Error reading entity from input stream.
   at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:866)
   at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:783)
 ....
 ....
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Root name 'totalCount' does not match expected ('items') for type [collection type; class java.util.Set, contains [simple type, class java.lang.Object]]
   at [Source: org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$UnCloseableInputStream@4f67eb2a; line: 1, column: 2]
   at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)

问题是，

Root name 'totalCount' does not match expected ('items')

响应json包含items属性，但杰克逊没有意识到它。请帮忙！类似的问题由包装类解决。我不想使用这样的包装类：

class Wrapper{
   int totalCount;
   Set items;
}

类似的问题：

JsonMappingException：根名称与预期不匹配

0 个答案: