Java 无法从 START_ARRAY 令牌反序列化对象的实例
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/32795219/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Can not deserialize instance of Object out of START_ARRAY token
提问by Ashish Srivastava
I have two object one is Dashboard and second is Room i have a json which is look like this
我有两个对象，一个是仪表板，第二个是 Room 我有一个 json，它看起来像这样
{
"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"
}
]
}
And the Object is
对象是
public class DashBoard {
private int hotel_id;
private int hotel_room;
@JsonProperty("hotel_properties")
private Room hotel_properties;
}
There is another Object Room which is look like this
还有另一个对象室看起来像这样
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;
}
I am Hide all constructor,setter and getter for Stackoverflow but it is in my code i want parse Json to Object using ObjectMapper from an URL using this code
我隐藏了 Stackoverflow 的所有构造函数、setter 和 getter，但在我的代码中，我想使用此代码从 URL 中使用 ObjectMapper 将 Json 解析为对象
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();
}
but i get this error
但我收到这个错误
org.codehaus.Hymanson.map.JsonMappingException: Can not deserialize instance of Object out of START_ARRAY token
please help me out from this
请帮我解决这个问题
采纳答案by Amila
From the JSONString you posted, it looks like there is a list of Roomobjects. But you have used a single object.
从JSON您发布的字符串来看，似乎有一个Room对象列表。但是您使用了单个对象。
In your DashBoardclass, try changing:
在您的DashBoard班级中，尝试更改：
private Room hotel_properties;
to:
到：
private List<Room> hotel_properties;
