处理复杂的JSON列表到POJO

Question

我从外部API收到以下格式的json响应。但是我不确定如何将其转换为POJO以便稍后在应用程序中分别获取所有这些值

{
    "count": 1,
    "item_list": [
        {
            "property_value_map": {
                "Data": {
                    "content_type": "image/jpeg",
                    "data": "ZJRgABAAEASABIAAD//gAfTEVBRCBUZWNobm9sb2dpZXMgSW5jLiBWMS"
                },
                "DataType": 0,
                "LastChanged": "2015-12-11T17:21:15+00:00",
                "ObjectType": 1,
                "PersonID": 1384
            }
        }
    ],
    "page_number": 1,
    "page_size": 20,
    "total_items": 1,
    "total_pages": 1,
    "type_name": "Lnl_MultimediaObject",
    "version": "1.0"
}

我如下创建了一个POJO并将其转换为JSON。但是问题是我不知道如何从JSON上方获取“数据”的值，因为我的item_list是对象

public class GetInstancesResponseVO {
    private int count;
    private List<Object> item_list;
    private int page_number;
    private int page_size;
    private int total_items;
    private int total_pages;
    private String type_name;
    private String version;

    public GetInstancesResponseVO() {}

        /***Getters Setters **/
}

更新

按照JaumeMoróni Tarrasa的建议进行一次pojo尝试

public class GetInstancesResponseVO {
  private int count;
  private List<PropertyValueMap> item_list;
  private int page_number;
  private int page_size;
  private int total_items;
  private int total_pages;
  private String type_name; 
  private String version;

/***CONSTRUCTOR, SETTERS, GETTERS***/
}

但是我得到null。这是我的PropertyValueMap POJO；

public class PropertyValueMap {
  private MyData Data;
  private int DataType;
  private String LastChanged;
  private String ObjectType;
  private String PersonID;

  public PropertyValueMap() {}

  /***GETTERS,SETTERS**/
}  

还有数据POJO；

public class MyData implements Serializable{
  private String content_type;
  private String data;


  public MyData() {}

  /***GETTERS, SETTERS**/
}

我在PropertValueMap POJO中尝试了将数据作为字符串使用，无论哪种方式，我都会得到null；

{
"count": 1,
"item_list": [
    {
        "objectType": null,
        "data": null,
        "personID": null,
        "lastChanged": null,
        "dataType": 0
    }
],
"page_number": 1,
"page_size": 20,
"total_items": 1,
"total_pages": 1,
"type_name": "Lnl_MultimediaObject",
"property_value_map": null,
"version": "1.0"

}

而且JSON响应看起来也不正确，因为它缺少“ property_value_map”。非常感谢您的帮助，因为我要为此再浪费一天。