Android GSON反序列化删除空数组

我正在使用 GSON 和 Retrofit。我想禁用空数组字段反序列化。

DTO:

public class Entity implements Serializable {

    @SerializedName("body")
    @Expose
    private BodyObject body;

我与一个rest API。如果正文字段为空，则发送空Array:

{
"body": []
}

例外：

java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 443 path $.body

如果主体被填满，那么他们会发送正确的对象。

{
  "body":  {
    "und": [
        {
        "value": "Test ....",
        "summary": "",
        "format": "filtered_html",
        "safe_value": "<p>Test ....</p>\n",
        "safe_summary": ""
        }
    ]
  }
}

-

Gson gson = new GsonBuilder()
                .setLenient()
                .create();

如何删除或禁用这些空数组反序列化？

正如 Alrama 暗示的那样，您可以通过创建自己的JsonDeserializer.

就像是

public class BodyObjectDeserializer implements JsonDeserializer<BodyObject> {
   @Override
   public BodyObject deserialize(JsonElement json, Type typeOfT
                                ,JsonDeserializationContext context)
         throws JsonParseException {
      try {
         return new Gson().fromJson(json, typeOfT);
      } catch (JsonSyntaxException e) {
         log.warn("Body seems empty: {}",e.getMessage());
      }
      return null;
   }
}

并将其注册到您的GSON您用来反序列化的。

Gson gson = new GsonBuilder()
      .setLenient() // maybe you do not need this
      .registerTypeAdapter(BodyObject.class, new BodyObjectDeserializer())
      .create();