问题：使用Jersey进行序列化，使用gson反序列化JSON

我一直在使用Jersey进行REST API并返回JSON。在客户端，我使用google-gson。在反序列化JSON的同时，我遇到了以下错误。问题：使用Jersey进行序列化，使用gson反序列化JSON

com.google.gson.JsonParseException: The JsonDeserializer MapTypeAdapter failed to deserialized json object {} given the type interface java.util.Map 
     at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:63) 
     at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:88) 
     at com.google.gson.JsonObjectDeserializationVisitor.visitFieldUsingCustomHandler(JsonObjectDeserializationVisitor.java:116) 
     at com.google.gson.ObjectNavigator.navigateClassFields(ObjectNavigator.java:158) 
     at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:131) 
     at com.google.gson.JsonDeserializationCo

正在由新泽西序列化到JSON由具有物体非通用的（没有类型指定）地图和列表

public class Dealer implements Serializable 
{ 
    private String serviceURL; 
    private Map hoursService; 
    List dealerAttributes; 
}

在这里是由新泽西州

{"serviceURL":www.google.com,"hoursService":{"3":{"dayOfWeek":3,"closeTime":"6:30 PM","openTime":"7:30 AM"},"2":{"dayOfWeek":2,"closeTime":"6:30 PM","openTime":"7:30 AM"},"1":{"dayOfWeek":1,"closeTime":"6:30 PM","openTime":"7:30 AM"}},"dealerAttributes":[{"language":"English","dealerAttributeName":"Spanish Speaking","updateDate":1174971061000},{"language":"English","updateDate":1103003316000}]}

产生的JSON

可能是什么原因。请帮我解决这个问题。有没有比gson更好的其他工具？请建议。

谢谢。

来源

2011-05-09 Amit Patel

同类问题：http://stackoverflow.com/questions/5424263/json-decode-custom-class-with-hashmap-member-using-gson-in-java – MatrixFrog 2011-05-14 18:52:52

示例JSON无效。 http://jsonlint.com

www.google.com必须附带引号。那么它是有效的。

已纠正了JSON，下面的反序列化例子输出

[Dealer: serviceURL=www.google.com, hoursService={ 
1=[Hours: dayOfWeek=1, closeTime=6:30 PM, openTime=7:30 AM], 
2=[Hours: dayOfWeek=2, closeTime=6:30 PM, openTime=7:30 AM], 
3=[Hours: dayOfWeek=3, closeTime=6:30 PM, openTime=7:30 AM]}, 
dealerAttributes=[ 
[DealerAttributes: language=English, dealerAttributeName=Spanish Speaking, updateDate=1174971061000], 
[DealerAttributes: language=English, dealerAttributeName=null, updateDate=1103003316000]]]

public class Foo 
{ 
    static String jsonInput = 
    "{" + 
     "\"serviceURL\":\"www.google.com\"," + 
     "\"hoursService\":" + 
     "{" + 
     "\"1\":" + 
     "{" + 
      "\"dayOfWeek\":1," + 
      "\"closeTime\":\"6:30 PM\"," + 
      "\"openTime\":\"7:30 AM\"" + 
     "}," + 
     "\"2\":" + 
     "{" + 
      "\"dayOfWeek\":2," + 
      "\"closeTime\":\"6:30 PM\"," + 
      "\"openTime\":\"7:30 AM\"" + 
     "}," + 
     "\"3\":" + 
     "{" + 
      "\"dayOfWeek\":3," + 
      "\"closeTime\":\"6:30 PM\"," + 
      "\"openTime\":\"7:30 AM\"" + 
     "}" + 
     "}," + 
     "\"dealerAttributes\":" + 
     "[" + 
     "{" + 
      "\"language\":\"English\"," + 
      "\"dealerAttributeName\":\"Spanish Speaking\"," + 
      "\"updateDate\":1174971061000" + 
     "}," + 
     "{" + 
      "\"language\":\"English\"," + 
      "\"updateDate\":1103003316000" + 
     "}" + 
     "]" + 
    "}"; 

    public static void main(String[] args) 
    { 
    GsonBuilder gsonBuilder = new GsonBuilder(); 
    Gson gson = gsonBuilder.create(); 
    Dealer dealer = gson.fromJson(jsonInput, Dealer.class); 
    System.out.println(dealer); 
    } 
} 

class Dealer 
{ 
    private String serviceURL; 
    private Map<String, Hours> hoursService; 
    private List<DealerAttributes> dealerAttributes; 

    @Override 
    public String toString() 
    { 
    return String.format(
     "[Dealer: serviceURL=%1$s, hoursService=%2$s, dealerAttributes=%3$s]", 
     serviceURL, hoursService, dealerAttributes); 
    } 
} 

class Hours 
{ 
    private int dayOfWeek; 
    private String closeTime; 
    private String openTime; 

    @Override 
    public String toString() 
    { 
    return String.format(
     "[Hours: dayOfWeek=%1$d, closeTime=%2$s, openTime=%3$s]", 
     dayOfWeek, closeTime, openTime); 
    } 
} 

class DealerAttributes 
{ 
    private String language; 
    private String dealerAttributeName; 
    private long updateDate; 

    @Override 
    public String toString() 
    { 
    return String.format(
     "[DealerAttributes: language=%1$s, dealerAttributeName=%2$s, updateDate=%3$d]", 
     language, dealerAttributeName, updateDate); 
    } 
}

这不使用泛型类型，我明白你说你没有使用序列化，但你坚持相同反序列化时的限制？如果是这样，那么你将不得不实施一些更“手动”的反序列化解析，因为，正如文档所说，"[w]hile deserializing, Collection must be of a specific generic type"。

来源

2011-06-01 10:04:22

问题：使用Jersey进行序列化，使用gson反序列化JSON

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