使用volley在android中获取服务器端会话ID

Question

我是android的新手,并创建了一个通过Web服务与服务器通信的应用程序.服务器端代码用asp.net编写,服务器端用于维护Session.我正在使用Volley来调用网络服务,但问题是我无法在服务器端维护会话,据我所知,我必须从头部获取会话ID我已经搜索了这个网站上的分配但是我我不能成功.我的问题是在整个应用程序中维护会话.下面是我在android中调用web服务的代码.

_Login_Webservice = new JsonObjectRequest(Request.Method.GET,
            _Login_Url, null, new Response.Listener<JSONObject>() {

        @Override
        public void onResponse(JSONObject response) {

            // Log.e(Utils.tag, "response :" + response);
            User _User;
            button.setLoadingState(false);

            try {
                boolean Success = response.getBoolean("Success");

                if (Success == true) {

                    //my code


                } 

            } catch (JSONException e) {
                e.printStackTrace();
            }
        }

    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.e("", "exception in Login User Login_Activity: ");
            Log.e("", "error is : " + error.toString());

        }
    }) {


        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();
            return params;
        }


    };
    //  _Login_Webservice.setRetryPolicy(new DefaultRetryPolicy(5000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    // Adding request to request queue
    Volley_Controller.getInstance().addToRequestQueue(_Login_Webservice,
            Config.VOLEY_TAG);

并且标题中的响应如下.

{X-AspNet-Version=4.0.30319, X-Android-Selected-Transport=http/1.1, Vary=Accept-Encoding, Date=Thu, 07 Apr 2016 08:26:23 GMT, X-Android-Received-Millis=1460017311847, Set-Cookie=ASP.NET_SessionId=obzjppign5twglksjesm24wi; path=/; HttpOnly, Content-Type=text/JSON; charset=utf-8, X-Powered-By=ASP.NET, X-Android-Response-Source=NETWORK 200, Server=Microsoft-IIS/7.5, X-Android-Sent-Millis=1460017311678, Cache-Control=private}

我需要ASP.NET_SessionId =的值,还需要在标头中的其他Web服务中发送它.现在我收到的回复如下

{"Success":false,"Info":"Object reference not set to an instance of an object."}

Answer 1

你必须使用Volley Library提供的parseNetworkResponse方法,你可以在标题中获得来自表单服务器的响应.

@Override
        protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
            try {

                String jsonString = new String(response.data,
                        HttpHeaderParser.parseCharset(response.headers));


                String header_response = String.valueOf(response.headers.values());
               int index1 = header_response.indexOf("ASP.NET_SessionId=");
                int index2 = header_response.indexOf("; path");

                Log.e(Utils.tag, "error is : " + index1 + "::" + index2);

                session_id = header_response.substring(index1, index2);

                // this is your session id put it in the variable and then you can use it any where you want to

                return Response.success(new JSONObject(jsonString),
                        HttpHeaderParser.parseCacheHeaders(response));

            } catch (UnsupportedEncodingException e) {
                return Response.error(new ParseError(e));
            } catch (JSONException je) {
                return Response.error(new ParseError(je));
            }
        }

当你打电话给任何其他网络服务时,只需将sessionId放在标题中,如下所示

@Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            HashMap<String, String> headers = new HashMap<String, String>();
            headers.put("Cookie",SessionId);
            return headers;
        }

记住你必须发送ASP.NET_SessionId = obzjppign5twglksjesm24wi作为值和密钥Cookie

希望有所帮助.