为什么 Volley 响应被接收为“[”而不是 JSON

Question

我正在了解 Volley，我不知道为什么 GET 方法的响应会以单个字符的形式出现 -> [.

我正在使用此方法获取 JSON 响应：

    public void getJsonMethod() {
    // Instantiate the RequestQueue.
    RequestQueue queue = Volley.newRequestQueue(context);
    // String url = "https://www.w3schools.com/js/myTutorials.txt";
    String url = "http://www.google.com"; // with this url I am getting response

    // Request a string response from the provided URL.
    final StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    System.out.println("Response is: " + response);
                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            System.out.println("Response is not good" + error.getMessage());
        }
    });
    // Add the request to the RequestQueue.
    queue.add(stringRequest);
}

当我使用 this link I do get a response but when I try to use some link that contains nothing but JSON like this one 时，我的回答是“[”.

我从 Activity 调用这个方法是这样的：

 GetJsonClass getJson = new GetJsonClass(this);
 getJson.getJsonMethod();

关于我在这里做错了什么有什么想法吗？

答案+代码

如果有人开始使用 Volley，也许这对他有帮助：

正如 David Lacroix 在他的回答中所说，我打电话给 stringRequest 而不是 JsonArrayRequest。

应该是这样的：

   public void getJsonMethod() {
    // Instantiate the RequestQueue.
    RequestQueue queue = Volley.newRequestQueue(context);
    String url = "your url";
    JsonArrayRequest jsonObjectRequest = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            System.out.println("this is response good" + response);
        }
    }, new ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            System.out.println("this is response bad" + error);
        }
    });
    queue.add(jsonObjectRequest);
}

Answer 1

myTutorials.txt 正在提供状态代码 304（也没有正确的后缀和 MIME 类型）：

304 Not Modified. If the client has performed a conditional GET request and access is allowed, but the document has not been modified, the server SHOULD respond with this status code. The 304 response MUST NOT contain a message-body, and thus is always terminated by the first empty line after the header fields.

换句话说，浏览器可能显示的内容不一定与服务器发送的内容相同。例如。 GSON 会接受 JSON 仅在启用宽松选项的情况下，因为数组没有名称。

参见 RFC 2616。

Answer 2

见https://developer.android.com/training/volley/request

StringRequest. Specify a URL and receive a raw string in response. See Setting Up a Request Queue for an example. JsonObjectRequest and JsonArrayRequest (both subclasses of JsonRequest). Specify a URL and get a JSON object or array (respectively) in response.

您应该使用 JsonArrayRequest

为什么 Volley 响应被接收为“[”而不是 JSON

Why Volley response is received as "[" and not JSON

android

android-volley

http-get

答案+代码