java - 值无法转换为 JSON 数组

Question

这是给我带来问题的函数:

    public String URLToJson() {
    String result = "";
    String jsonString = ReadingURL(" here goes my URL that reads a JSON ");
    JSONObject jsonResult = null;
    try {
        jsonResult = new JSONObject(jsonString);
        JSONArray data = jsonResult.getJSONArray("Configuracion");
        if (data != null) {
            for (int i = 0; i <= data.length(); i++) {
                result =  result + "Dirección: " + data.getJSONObject(i).getString("Direccion") + "\n";
                result =  result + "Cédula: " + data.getJSONObject(i).getString("Cedula") + "\n";
                result =  result + "Nombre: : " + data.getJSONObject(i).getString("Nombre") + "\n";
                result =  result + "Teléfono : " + data.getJSONObject(i).getString("Telefono") + "\n";
                result =  result + "Hacienda: " + data.getJSONObject(i).getString("Hacienda") + "\n";
            }
        }
        return result;
    }catch (JSONException e){
        e.printStackTrace();
        return "Error Reading JSON Data";
    }
}

然后出现了:

`W/System.err: org.json.JSONException: Value {"Direccion":"Somewhere","Cedula":"111111","Nombre":"Something","Telefono":"2222-2440","Hacienda":"Something"} at Configuracion of type org.json.JSONObject cannot be converted to JSONArray
        at org.json.JSON.typeMismatch(JSON.java:100)
W/System.err:     at org.json.JSONObject.getJSONArray(JSONObject.java:588)
        at com.example.user.mypos.PrintManager.URLToJson(PrintManager.java:977)
W/System.err:     at com.example.user.mypos.PrintManager$4.run(PrintManager.java:917)
        at java.lang.Thread.run(Thread.java:818)W/System.err: org.json.JSONException: Value { the values that are supposed to be }  of type org.json.JSONObject cannot be converted to JSONArray`

ReadingURL 基本上读取 URL 的内容，该 URL 在 String 中具有 JSON。

Answer 1

从异常中可以清楚地看出，URL 返回的 JSON 字符串属于 JSONObject 类型，而不是 JSONArray。

Value { the values that are supposed to be } of type org.json.JSONObject cannot be converted to JSONArray

JSON 对象将以 { 开始并以 } 结束

{ "KEY1":"VALUE1", "KEY2":"VALUE2" }

JSON 数组将以 [ 开始并以 ] 结束。

[
{"KEY1":"VALUE1","KEY2":"VALUE2"},{"KEY1":"VALUE1","KEY2":"VALUE2"}
]

所以你得到这个异常是因为你试图将 JSON 对象转换为 JSON 数组。