Volley Post JsonObjectRequest 在使用 getHeader 和 getParams 时忽略参数

Posted 2023-02-21

【中文标题】Volley Post JsonObjectRequest 在使用 getHeader 和 getParams 时忽略参数

【英文标题】：Volley Post JsonObjectRequest ignoring parameters while using getHeader and getParams

【发布时间】：2014-08-25 14:14:04

【问题描述】：

我正在尝试连接 API url="api adress"，它接受两种标头类型 application/json 以响应 json 和 application/xml 以响应 xml。我需要用 json 参数打 JSON，响应也将是 json 格式。使用带有 JsonObjectRequest 设置标头的 android volley Post 请求使用 getHeaders 连接到服务器，但 getParams 设置参数不起作用。

RequestQueue queue = Volley.newRequestQueue(this);
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,
            Constants.BASE_URL + Constants.LOGIN, null, response,
            response_error) 
        /**
         * Passing some request headers
         * */
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError 
            HashMap<String, String> headers = new HashMap<String, String>();
            headers.put("Content-Type", "application/json");
            return headers;
        
         @Override
         protected Map<String, String> getPostParams()
         throws AuthFailureError 
         // TODO Auto-generated method stub
            Map<String, String> params = new HashMap<String, String>();
            params.put("key", "value");
            return params;
         
    ;
    // implementation of listeners
    Response.Listener<JSONObject> response = new Response.Listener<JSONObject>() 

        @Override
        public void onResponse(JSONObject response) 
            Log.d(TAG, response.toString());
            Log.e("responce", response.toString());

            // msgResponse.setText(response.toString());
            hideProgressDialog();
        
    ;
    Response.ErrorListener response_error = new Response.ErrorListener() 

        @Override
        public void onErrorResponse(VolleyError error) 
            Log.e("error responce", error.getMessage());
            VolleyLog.d(TAG, "Error: " + error.getMessage());
            hideProgressDialog();
        
    ;
//get params never get called
//i also tried alternative to send params but does not works.
        Map<String, String> params = new HashMap<String, String>();
            params.put("key", "value");
        JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,
            Constants.BASE_URL + Constants.LOGIN, new JSONObject(params), response,
            response_error) 
        /**
         * Passing some request headers
         * */
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError 
            HashMap<String, String> headers = new HashMap<String, String>();
            headers.put("Content-Type", "application/json");
            return headers;
        
;

    any type of help will be appretiated, Thanks in advance.

【参考方案1】：

Volley 会忽略你的Content-Type 设置，如果你想修改内容类型，你可以覆盖getBodyContentType 方法：

JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST, url,
        new JSONObject(params), response, response_error) 
    @Override
    public String getBodyContentType() 
        return "application/json; charset=utf-8";
    

为什么凌空忽略你的参数？看看我的另一个answer。

【参考方案2】：

Volley JsonObjectRequest Post request not working

从该帖子中获取另一个答案，开头是：您可以创建自定义 JSONObjectReuqest