字符串類型的值不能轉換為JSONObject

Question

我正在努力解決一個錯誤，該錯誤告訴我它無法將String值轉換為JSONObject。 我試圖將CSRFToken作為參數傳遞給我的JSONObjectRequest。 我不知道這是否是解決問題的正確方法。

我收到錯誤消息： org.json.JSONException: Value inz9J9w0N5qASdJO8soWFBZ4UrEpdnjnpmxvFbJ2 of type java.lang.String cannot be converted to JSONObject

相關代碼如下。

HashMap<String, String> params = new HashMap<>();
params.put("_token", ((TestApplication) getApplication()).getCSRFToken());

JsonObjectRequest stringRequest = new JsonObjectRequest(Request.Method.POST, url, new JSONObject(params), new Response.Listener<JSONObject>() {
    @Override
    public void onResponse(JSONObject response) {
        AlertDialog alertDialog = new AlertDialog.Builder(RegisterActivity.this).create();
        alertDialog.setTitle("Alert");
        Log.i("response", response.toString());
        alertDialog.setMessage(response.toString());
        alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        alertDialog.show();
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        AlertDialog alertDialog = new AlertDialog.Builder(RegisterActivity.this).create();
        alertDialog.setTitle("Alert");
        alertDialog.setMessage(error.getMessage());
        alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        alertDialog.show();
    }
});

queue.add(stringRequest);

有誰知道我可能做錯了什么以及如何糾正該問題？

Answer 1

以下內容應有效。

{
    "_token": "inz9J9w0N5qASdJO8soWFBZ4UrEpdnjnpmxvFbJ2"
}

你能試一下嗎

String tokenString = (String) ((TestApplication) getApplication()).getCSRFToken();
JSONObject params = new JSONObject();
params.put("_token", tokenString);

JsonObjectRequest stringRequest = new JsonObjectRequest(Request.Method.POST, url, params, new Response.Listener<JSONObject>() {
// ...
}

Answer 2

我知道了。 JsonObjectRequest不發送任何接受標頭。 添加accept標頭后，我可以得到我想要的響應。

最終代碼：

HashMap<String, String> params = new HashMap<>();

JsonObjectRequest stringRequest = new JsonObjectRequest(Request.Method.POST, url, new JSONObject(params), new Response.Listener<JSONObject>() {
    @Override
    public void onResponse(JSONObject response) {
        // ...
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        AlertDialog alertDialog = new AlertDialog.Builder(RegisterActivity.this).create();
        alertDialog.setTitle("Alert");
        //alertDialog.setMessage(error.toString());
        alertDialog.setMessage(new String(error.networkResponse.data));
        alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        alertDialog.show();
    }
}) {
    @Override
    public Map<String, String> getHeaders() throws AuthFailureError {
        Map<String, String> params = new HashMap<>();
        params.put("X-CSRF-TOKEN", ((TestApplication) getApplication()).getCSRFToken());
        params.put("Accept", "application/json");
        return params;
    }
};

queue.add(stringRequest);