無法反序列化對象的實例出來的START_ARRAY令牌

Question

我有兩個目的一個是儀表盤和第二的房間，我有一個JSON是這個樣子

{ 
"hotel_id":"1", 
"hotel_room":"200", 
"hotel_properties":[{ 
     "id":"1", 
     "room_type":"Single", 
     "rack_rate":"2000", 
     "publish_rate":"1800", 
     "discount":"10", 
     "availiable":"40", 
     "total":"50" 
     }, 
     { 
     "id":"2", 
     "room_type":"Double", 
     "rack_rate":"4000", 
     "publish_rate":"3600", 
     "discount":"10", 
     "availiable":"45", 
     "total":"50" 
     } 
     ] 
    } 

和對象是

public class DashBoard { 
    private int hotel_id; 
    private int hotel_room; 
    @JsonProperty("hotel_properties") 
    private Room hotel_properties; 
    } 

還有另一種對象間是這個樣子

public class Room { 
    private Long id; 
    private String room_type; 
    private String rack_rate; 
    private String publish_rate; 
    private String discount; 
    private String availiable; 
    private String total; 
} 

我隱藏所有構造函數，setter和getter FO [R＃1，但它是在我的代碼 我想解析JSON使用此代碼

JsonReader jsonReader = new JsonReader(); 
     ObjectMapper mapper = new ObjectMapper(); 
     try { 
      JSONObject json = jsonReader.readJsonFromUrl("http://localhost/quinchy/json/dashboard.json"); 
      DashBoard dsh = mapper.readValue(json.toString(), DashBoard.class); 
      System.out.println(json.toString()); 
     } catch (IOException | JSONException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

使用ObjectMapper從URL到對象，但我得到這個錯誤

org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of Object out of START_ARRAY token 

請幫我從這個

Answer 1

從您發佈的JSON字符串看起來好像有一個Room對象的列表。但是你使用了一個單一的對象。

在你DashBoard類，嘗試改變：

private Room hotel_properties; 

到：

private List<Room> hotel_properties;