带有标头和正文的 Android Volley POST 请求

Question

我的代码正在尝试将数据发布到服务器，我需要添加一个标头，我正在使用 Volley 库。

如果我不包含“getparams”方法，则请求有效，我可以发布但没有数据。

如果我包含“getparams”方法，请求将失败并返回 400（错误请求）。

我一直无法找出错误在哪里。

         public void tryPost() {
    RequestQueue queue = Volley.newRequestQueue(this);

    String serverUrl = "http://10.0.2.2:3000/tasks";



    StringRequest stringRequest = new StringRequest(Request.Method.POST, serverUrl,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    Log.d("TAG", "response = "+ response);
                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.d("TAG", "Error = "+ error);
        }
    })
    {
        //
        @Override
        public Map<String, String> getHeaders()  {
            HashMap<String, String> headers = new HashMap<>();
            headers.put("Accept", "application/json");
            headers.put("Content-Type", "application/json");
            return headers;
        }
        ////
        @Override
        public Map<String, String> getParams() {
            Map<String, String> params = new HashMap<>();
            params.put("userId","sargent"); 
            params.put("password","1234567"); 
            return params; //return the parameters
        }
    };
    // Add the request to the RequestQueue.
    queue.add(stringRequest);
    }

Answer 1

对于 Authentication，您应该将该信息包含在 getHeaders 而不是 getParams

中

删除 getParams 并将其添加到您的 getHeaders

@Override
public Map<String, String> getHeaders() throws AuthFailureError {
       Map<String, String> headers = new HashMap<>();                
       String credentials = "username:password";
       String auth = "Basic "
                        + Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);
       headers.put("Accept", "application/json");
       headers.put("Content-Type", "application/json");
       headers.put("Authorization", auth);
       return headers;
}

希望对你有帮助

Answer 2

我不怎么使用 volley，但我有一个替代方法可以轻松完成你的工作。如果你想使用 AsyncHTTPClient 试试这个。

public void tryPost(){
   AsynHTTPClient client = new AsyncHTTPClient();

   //to add the data which you wanna post 
   RequestParams params = new RequestParams();
   params.add("pass your value","from this value");
   params.put("list","your_list"); // this is for passing the arraylist

  client.post(url, params, new AsynchHTTPRespondHandeler(){
  // implement method to get the response from onSuccess()

  });
}

对于 AsynchHTTPClient，请在您的 gradle 中执行此操作：

compile 'com.loopj.android:android-async-http:1.4.9'

您可以了解有关 RequestParams 的更多信息，以便传递不同的数据here。

我希望你能完成你的工作。如有任何问题，请联系我。

Answer 3

请查看此链接：

StringRequest request = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
    @Override
    public void onResponse(String s) {
        ///handle response from service
    }, new ErrorResponse() {
      @Override
      public void onErrorResponse(VolleyError volleyError) {
        //handle error response
      }
  }) {
      @Override
      protected Map<String, String> getParams() throws AuthFailureError {
          Map<String, String> params = new HashMap<String, String>();
          //add params <key,value>
          return params;
      }

      @Override
      public Map<String, String> getHeaders() throws AuthFailureError {
        Map<String,String> headers = Constants.getHeaders(context);
        // add headers <key,value>
        String credentials = USERNAME+":"+PASSWORD;
        String auth = "Basic "
                + Base64.encodeToString(credentials.getBytes(),
                Base64.NO_WRAP);
        headers.put("Authorization", auth);
        return headers;
      }
  };
 mQueue.add(request);

https://gist.github.com/jchernandez/5bec1913af80e2923da8

Answer 4

对于 POST 请求，对于 Header 部分，您必须覆盖 getHeaders() 'function'，对于您的请求的** payload/body**可以提供 JsonObject 作为“请求”的参数，也可以覆盖 getParams() 'function'

Kotlin 程序员发帖代码：

// 创建 Json 有效负载

val requestJsonPayloadMap = mutableMapOf<String, String>()
        requestJsonPayloadMap["param1"] = "param1Value"
        requestJsonPayloadMap["param2"] = "param2Value"

        // Creating JSON Object out of the Hash-map
        val requestJSONObject = JSONObject(requestJsonPayloadMap)

// 将上面的payload传递给下面的请求[那么不需要重写'getParams()'方法]

val volleyEnrollRequest = object : JsonObjectRequest(GET_POST_PARAM, TARGET_URL, requestJSONObject,
            Response.Listener {
                // Success Part  
            },

            Response.ErrorListener {
                // Failure Part
            }
        ) {
            // Providing Request Headers

            override fun getHeaders(): Map<String, String> {
               // Create HashMap of your Headers as the example provided below

                val headers = HashMap<String, String>()
                headers["Content-Type"] = "application/json"
                headers["app_id"] = APP_ID
                headers["app_key"] = API_KEY

                return headers
            }

            // Either override the below method or pass the payload as parameter above, dont do both 

            override fun getParams(): Map<String, String> {
               // Create HashMap of your params as the example provided below

                val headers = HashMap<String, String>()
                headers["param1"] = "param1Value"
                headers["param2"] = "param2Value"
                headers["param3"] = "param3Value"

                return headers
            }
        }