Question

我正在学习参与并试图让它成为现实。发现了很多类似的问题和更多的解决方案，但没有任何帮助我

那是我的json

{
  "firstName": "name",
  "lastName": "last",
  "resistances": {
    "a1": 1,
    "a2": 2,
    "a3": 3,
    "a4": 4
  }
}

Player.class

class Player implements Serializable{

    String firstName;
    String lastName;
    int[] resistances;

    public Player(String firstName, String lastName, int[] resistances) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.resistances = resistances;
    }
}

以及我如何尝试parce

Gson gson = new Gson();
Player player = gson.fromJson("test.json", Player.class);

SOS

Answer 1

您的JSON“抵抗”对象应如下所示，以便您的解析代码能够正常工作：

{
  "firstName": "name",
  "lastName": "last",
  "resistances": [
    1, 2, 3, 4
  ]
}

或者，将Java中的resistances变量更改为Map。 Look here for a previous answer - GSON可以将字典JSON对象解析为Map。

class Player implements Serializable {

    String firstName;
    String lastName;
    Map<String, Integer> resistances;

    public Player(String firstName, String lastName, Map<String, Integer> resistances) {
        this.firstName   = firstName;
        this.lastName    = lastName;
        this.resistances = resistances;
    }
}

Answer 2

fromJson(String, Class)解析String本身，在您的情况下test.json，而不是它所代表的文件。您需要从您尝试解析的文件中创建一个Reader，并将其作为第一个参数传递。

如果test.json在外部存储中：

String fpath = Environment.getExternalStorageDirectory() + "/path/to/test.json";
 try {
        FileReader fr = new FileReader(fpath));
        gson.fromJson(fr, Player.class);
} catch (Exception e1) {
        e1.printStackTrace();
}

java.lang.IllegalStateException：预期BEGIN_OBJECT但在第1行是STRING

2 个答案: