卷网服务器错误,网络响应为空

Question

每次我尝试使用Volley的POST方法时,都会出现严重错误.我在getCause中得到null值,在getNetworkResponse.toString()中得到一些默认值.

如果我使用GET方法,这工作正常(我从我的网址得到回复).

有人可以帮忙吗？

    Map<String, String> jsonParams = new HashMap<String, String>();
    jsonParams.put("teststr", "abd");

    RequestQueue requestQueue = VolleySingleton.getInstance().getRequestQueue();
    JsonObjectRequest request = new JsonObjectRequest(
            Request.Method.POST,
            url,
            new JSONObject(jsonParams),
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {

                    try {
                        Toast.makeText(getApplicationContext(), "Success"+response.toString(), Toast.LENGTH_LONG).show();
                    }catch(Exception e){
                        Toast.makeText(getApplicationContext(), "JSON ERROR", Toast.LENGTH_LONG).show();
                    }
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Log.d("abd", "Error: " + error
                                    + ">>" + error.networkResponse.statusCode
                                    + ">>" + error.networkResponse.data
                                    + ">>" + error.getCause()
                                    + ">>" + error.getMessage());
                }
            }) {

                @Override
                protected Map<String,String> getParams() {
                    HashMap<String, String> params = new HashMap<String, String>();
                    params.put("key", "value");
                    return params;
                }

                @Override
                public Map<String, String> getHeaders() throws AuthFailureError {
                    HashMap<String, String> headers = new HashMap<String, String>();
                    headers.put("Content-Type", "application/json; charset=utf-8");
                    return headers;
                }
    };
    requestQueue.add(request);

错误日志:

错误:错误:com.android.volley.ServerError >> 404 >> [B @ 42b1e0d0 >> null >> null

更新: networkResponse.statusCode为404,尽管url是可访问的(如果我只使用GET方法则返回数据).如果我在POST方法中删除标题部分,仍然是相同的.

网址:

<?php
    $response = array();

    $jsonString = file_get_contents('php://input');
    $jsonObj = json_decode($jsonString, true);

    if(!isset($jsonObj['teststr'])){
        $response["msg"] = "No data.";
    }else{
        $response["msg"] = "Success: ".$jsonObj['teststr'];
    }
    echo json_encode($response);
?>

Answer 1

首先,尝试确保您的服务器运行良好.您可以使用Postman(chrome插件)或任何其他方式向网址发送帖子请求并查看其响应内容.

确保您的服务器没有问题后,让我们用排球解决问题.

JsonObjectRequest使用POST方法时有一些问题.像这样Volley JsonObjectRequest Post请求不起作用.

我建议你StringRequest先使用并getParams像之前一样覆盖方法.在您完成此任务后,您可以尝试编写自己的请求,这不是非常困难但非常有用.

我也建议添加request.setShouldCache(false)之前requestQueue.add(request);.默认情况下,volley将响应保存在其缓存中,此行为可能会导致一些奇怪的问题.

Answer 2

问题是您的队列。更改您的齐射代码为：

 RequestQueue queue = Volley.newRequestQueue(this);
 String URL = EndPoints.BASE_URL + "/call";
 StringRequest request = new StringRequest(Request.Method.POST, URL,
  new Response.Listener<String>()
  {
    @Override
    public void onResponse(String response) {

      Log.d("onResponse", response);

    }
  },
  new Response.ErrorListener()
  {
    @Override
    public void onErrorResponse(VolleyError error) {

      NetworkResponse response = error.networkResponse;
      String errorMsg = "";
      if(response != null && response.data != null){
        String errorString = new String(response.data);
        Log.i("log error", errorString);
      }
    }
  }
) {
  @Override
  protected Map<String, String> getParams()
  {

    Map<String, String> params = new HashMap<String, String>();
    params.put("key_1","value_1");
    params.put("key_2", "value_2");
    Log.i("sending ", params.toString());

    return params;
  }

};


 // Add the realibility on the connection.
 request.setRetryPolicy(new DefaultRetryPolicy(10000, 1, 1.0f));

  // Start the request immediately
    queue.add(request);  

和您的php（laravel）代码：

    $response['success'] = true;
    $response['user']['tell'] = $user->tell;
    $response['user']['code'] = $user->code;
    $response['user']['time'] = $time;
    $response['user']['register_state'] = '1'
    return response()->json($response, 200);

Answer 3

好吧，我想你可以先在 logcat 中打印responseCode