使用子项

Question

我有一个使用带子项的对象的Json列表

{
 "id":"154",
 "name":"peter",
 "children": [
               {
                "id":"122",
                "name": "mick",
                "children":[]
               },
               {
                "id":"123",
                "name": "mick",
                "children":[]
               }
            ]
}

这是我的对象的类：

public class person{
                    private String id;
                    private String name;
                    private List<person> children;

//getters and setters
}

当我尝试反序列化此对象时，出现以下错误

  

无法从START_ARRAY令牌中反序列化人员实例

我该怎么办？

Answer 1

JSON包含一系列人员。 您的班级是person。

的列表

更改建议的@Naveed Yadav之类的JSON或将类更改为

public class Person{
             private String id;
             private String name;
             private Person[] children;

//getters and setters
}

（BTW类名应该是Java中的大写）

Answer 2

修复JSON正文中的语法错误，您将处于良好的状态：

{
 "id":"154",
 "name":"peter",
 "children": [
               {
                "id":"122",
                "name": "mick",
                "children":[], <== Excess comma
               } <== Missing comma 
               {
                "id":"123",
                "name": "mick",
                "children":[], <== Excess comma
               }
            ]
}

有效的一个：

{
    "id": "154",
    "name": "peter",
    "children": [{
            "id": "122",
            "name": "mick",
            "children": []
        },
        {
            "id": "123",
            "name": "mick",
            "children": []
        }
    ]
}

Answer 3

您需要更改您的POJO声明，如下所示： -

 public class person{
                private String id;
                private String name;
                private List<Children> children;

               //getters and setters

   private class Children{
                private String id;
                private String name;
                private String[] children;

}

Answer 4

{
 "id":"154",
 "name":"peter",
 "children": 
               {
                "id":"122",
                "name": "mick",
                "children":[],
               }
               {
                "id":"123",
                "name": "mick",
                "children":[],
               }

}