改造：错误反序列化数组与一个元素：“出START_ARRAY令牌”

我写即利用robospice，改造一个Android应用程序，和杰克逊2.4.X，改造：错误反序列化数组与一个元素：“出START_ARRAY令牌”

这里是我尝试反序列化JSON的这是从休息服务回来的。返回的“data”数组中的元素是我想要反序列化的Notification对象。

{ 
    "data": [ 
     { 
     "uuid": "XXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXX", 
     "AcctNo": "XXXXXXXXXX", 
     "title": "Test Notification", 
     "content": "Here is some content.", 
     "date": "2015-03-24" 
     } 
    ] 
    }

我第一次包裹在NotificationResponse对象的响应：

@JsonRootName(value = "data") 
@JsonIgnoreProperties(ignoreUnknown = true) 
public class NotificationResponse { 

    @JsonUnwrapped 
    public Notification[] notifications; 
}

通知对象看起来是这样的：

public class Notification { 

     @JsonProperty("uuid") 
     public String Uuid; 

     @JsonProperty("AcctNo") 
     public String acctNo; 

     @JsonProperty("title") 
     public String title; 

     @JsonProperty("content") 
     public String content; 

     @JsonProperty("date") 
     public String date; 

    }

堆栈跟踪：

04-01 11:51:17.326 18978-19463/com.xxxxx.android E/﹕ An exception occurred during request network execution :com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.xxxxx.android.model.NotificationResponse out of START_ARRAY token 
       at [Source: re[email protected]8b4da58; line: 1, column: 2] 
     retrofit.RetrofitError: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.xxxxx.android.model.NotificationResponse out of START_ARRAY token 
       at [Source: re[email protected]8b4da58; line: 1, column: 2] 
       at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:383) 
       at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240) 
       at java.lang.reflect.Proxy.invoke(Proxy.java:397) 
       at $Proxy15.notifications(Unknown Source) 
       at com.xxxxx.android.network.spice.NotificationSpiceRequest.loadDataFromNetwork(NotificationSpiceRequest.java:21) 
       at com.xxxxx.android.network.spice.NotificationSpiceRequest.loadDataFromNetwork(NotificationSpiceRequest.java:9) 
       at com.octo.android.robospice.request.CachedSpiceRequest.loadDataFromNetwork(CachedSpiceRequest.java:48) 
       at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:150) 
       at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:217) 
       at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422) 
       at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
       at java.lang.Thread.run(Thread.java:818) 
     Caused by: retrofit.converter.ConversionException: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.xxxxx.android.model.NotificationResponse out of START_ARRAY token 
       at [Source: re[email protected]8b4da58; line: 1, column: 2] 
       at retrofit.converter.JacksonConverter.fromBody(JacksonConverter.java:40) 
       at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:367) 
                at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240) 
                at java.lang.reflect.Proxy.invoke(Proxy.java:397) 
                at $Proxy15.notifications(Unknown Source) 
                at com.xxxxx.android.network.spice.NotificationSpiceRequest.loadDataFromNetwork(NotificationSpiceRequest.java:21) 
                at com.xxxxx.android.network.spice.NotificationSpiceRequest.loadDataFromNetwork(NotificationSpiceRequest.java:9) 
                at com.octo.android.robospice.request.CachedSpiceRequest.loadDataFromNetwork(CachedSpiceRequest.java:48) 
                at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:150) 
                at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:217) 
                at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422) 
                at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
                at java.lang.Thread.run(Thread.java:818) 
     Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.xxxxx.android.model.NotificationResponse out of START_ARRAY token 
       at [Source: re[email protected]8b4da58; line: 1, column: 2] 
       at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:749) 
       at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:745) 
       at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromArray(BeanDeserializerBase.java:1203) 
       at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:147) 
       at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:126) 
       at com.fasterxml.jackson.databind.ObjectMapper._unwrapAndDeserialize(ObjectMapper.java:3126) 
       at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3049) 
       at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2206) 
       at retrofit.converter.JacksonConverter.fromBody(JacksonConverter.java:36) 
                at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:367) 
                at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240) 
                at java.lang.reflect.Proxy.invoke(Proxy.java:397) 
                at $Proxy15.notifications(Unknown Source) 
                at com.xxxxx.android.network.spice.NotificationSpiceRequest.loadDataFromNetwork(NotificationSpiceRequest.java:21) 
                at com.xxxxx.android.network.spice.NotificationSpiceRequest.loadDataFromNetwork(NotificationSpiceRequest.java:9) 
                at com.octo.android.robospice.request.CachedSpiceRequest.loadDataFromNetwork(CachedSpiceRequest.java:48) 
                at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:150) 
                at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:217) 
                at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422) 
                at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
                at java.lang.Thread.run(Thread.java:818)

在此先感谢。让我知道你是否需要任何进一步的信息。

编辑：我忘了提，我使用了以下内容：

ObjectMapper om = new ObjectMapper(); 
om.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);

来源

2015-04-01 Festive Larry

作为每回答，是的，只是改变类型。但是还要注意'@ JsonUnwrapped'在这里被忽略，因为它只能用于JSON对象而不是数组。有几种方法可以将“单个元素”数组“解开”为一个值，然后启用“DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY”。这对传统的JSON有时很有用。 – StaxMan 2015-04-01 21:48:54

您需要在您的NotificationResponse对象与@JsonCreator注释这样的构造：

@JsonCreator 
public NotificationResponse(Notification[] notifications) { 
    this.notifications = notifications; 
}

来源

2015-04-01 17:23:34 amram99

工程就像一个魅力。谢谢。 – 2015-04-01 17:25:58

改造：错误反序列化数组与一个元素：“出START_ARRAY令牌”

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