Volley使用POST方法将JSONObject发送到服务器

Question

我想通过使用volley库{"user_id":12,"answers":{"11":3,"12":4,"13":5}}将以下格式的jsonobject发送到服务器

JSONObject object = new JSONObject();

            try {
                object.put("user_id", user_id);
                JSONObject answers = new JSONObject();
               for (int i = 0; i < questions.size(); i++) {
                    JSONObject answer = new JSONObject();
                    answer.put(questions.get(i).getId(),questions.get(i).getAnswer());
                    answers.put("answers", answer);
                    object.put("answers", answer);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

如果我想使用StringRequest,我应该如何使用POST方法将此JsonObject发送到服务器

Answer 1

您可以使用以下工作示例代码.我测试过了.希望这可以帮助!

       try {
            jsonBody = new JSONObject();
            jsonBody.put("Title", "VolleyApp Android Demo");
            jsonBody.put("Author", "BNK");
            jsonBody.put("Date", "2015/08/26");
            requestBody = jsonBody.toString();

            StringRequest stringRequest = new StringRequest(1, url, new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    textView.setText(response);
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    textView.setText(error.toString());
                }
            }) {
                @Override
                public String getBodyContentType() {
                    return String.format("application/json; charset=utf-8");
                }

                @Override
                public byte[] getBody() throws AuthFailureError {
                    try {
                        return requestBody == null ? null : requestBody.getBytes("utf-8");
                    } catch (UnsupportedEncodingException uee) {
                        VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s",
                                requestBody, "utf-8");
                        return null;
                    }
                }
            };
            MySingleton.getInstance(this).addToRequestQueue(stringRequest);
        } catch (JSONException e) {
            e.printStackTrace();
        }

更新:要根据您的要求创建JSONObject,请使用以下命令:

        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject.put("11", 3);
            jsonObject.put("12", 4);
            jsonObject.put("13", 5);

            JSONObject jsonObject2 = new JSONObject().put("answers", jsonObject);
            jsonObject2.put("user_id", 12);            
        } catch (JSONException e) {
            e.printStackTrace();
        }