合併JSON對象

Question

我有兩個jsons

1. 

{"root": { 
    "item": [ 
     { 
      "groupName": "Al Karama Fire Station", 
      "vehicleId": 211, 
      "speed": 81 
     }, 
     { 
      "groupName": "Al Karama Fire Station", 
      "vehicleId": 137, 
      "speed": 83 
     } 
    ], 
    "rowCount": 2 
}} 

---

2. 



     {"root": { 
      "item": { 
       "groupName": "Al Karama Fire Station", 
       "vehicleId": 222, 
       "speed": 1 
      }, 
      "rowCount": 1 
     }} 

理想的第二JSON應該給我 「項」 的列表，但它沒有發生。我需要轉換合併兩個JSON來獲得一個合併。

預計：

{"root": { 
    "item": [ 
     { 
      "groupName": "Al Karama Fire Station", 
      "vehicleId": 211, 
      "speed": 81 
     }, 
     { 
      "groupName": "Al Karama Fire Station", 
      "vehicleId": 137, 
      "speed": 83 
     }, 
     { 
      "groupName": "Al Karama Fire Station", 
      "vehicleId": 222, 
      "speed": 1 
     } 
    ], 
    "rowCount": 3 
}} 

要做到這一點，我創建了下面的DTO。

public class ParentDTO { 

    private RootDTO root; 

    public RootDTO getRoot() { 
     return root; 
    } 
    public void setRoot(RootDTO root) { 
     this.root = root; 
    } 
} 

public class RootDTO { 
    private List<ItemDTO> item = new ArrayList<ItemDTO>(); 
    private Integer rowCount; 

    public List<ItemDTO> getItem() { 
     return item; 
    } 
    public void setItem(List<ItemDTO> item) { 
     this.item = item; 
    } 
    public Integer getRowCount() { 
     return rowCount; 
    } 
    public void setRowCount(Integer rowCount) { 
     this.rowCount = rowCount; 
    } 
} 

public class ItemDTO { 

    private String groupName; 
    private String vehicleId; 
    private Long speed; 

    public String getGroupName() { 
     return groupName; 
    } 

    public void setGroupName(String groupName) { 
     this.groupName = groupName; 
    } 

    public String getVehicleId() { 
     return vehicleId; 
    } 

    public void setVehicleId(String vehicleId) { 
     this.vehicleId = vehicleId; 
    } 

    public Long getSpeed() { 
     return speed; 
    } 

    public void setSpeed(Long speed) { 
     this.speed = speed; 
    } 
} 

我的問題是，在合併，我越來越

Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 2 column 14 path $.root.item 

如果我能得到如下的第二JSON，代碼工作正常。

{"root": { 
     "item": [ 
     { 
      "groupName": "Al Karama Fire Station", 
      "vehicleId": 222, 
      "speed": 1 
     } 
     ], 
     "rowCount": 1 
    }} 

請建議。

代碼來解析JSON

Gson gson = new Gson(); 
ParentDTO updatedloginDto2 = gson.fromJson(tmp1, ParentDTO .class); 

Answer 1

你必須創建兩個根的DTO - 一個用於對具有單個子根，解編JSON之後添加了「獨生子女的列表和一個根孩子「的元素與兒童的列表。

編輯：

public class RootSingleChildDTO { 
    private ItemDTO item; 
    private Integer rowCount; 

    public ItemDTO getItem() { 
     return item; 
    } 
    public void setItem(ItemDTO item) { 
     this.item = item; 
    } 
    public Integer getRowCount() { 
     return rowCount; 
    } 
    public void setRowCount(Integer rowCount) { 
     this.rowCount = rowCount; 
    } 
}