Question

这是我从服务器获取的数据格式。

[  
{  
  "rid":"1",
  "srid":"0",
  "estimated_value":"100000",
  "expected_close_date":"2014-11-22",
  "sid":"2",
  "others":null
},
{  
  "rid":"1",
  "srid":"6",
  "estimated_value":0,
  "expected_close_date":null,
  "sid":"2",
  "others":null
},
{  
  "rid":"1",
  "srid":"7",
  "estimated_value":0,
  "expected_close_date":null,
  "sid":"2",
  "others":null
},
{  
  "rid":"11",
  "srid":"0",
  "estimated_value":"300000",
  "expected_close_date":"2014-11-14",
  "sid":"1",
  "others":null
},
{  
  "rid":"11",
  "srid":"38",
  "estimated_value":0,
  "expected_close_date":null,
  "sid":"1",
  "others":null
},
{  
  "rid":"11",
  "srid":"39",
  "estimated_value":0,
  "expected_close_date":null,
  "sid":"1",
  "others":null
}
]

接收此JSON对象并设置为我的表单。我可以再做一些修改，我必须以相同的格式将它发送到服务器。如何在JSON中发送空值？如果我在不给出引号的情况下给出null值，则JSON对象中的键和值不可用。

如果我在双引号内给它，那么它就像"others" : "null"。但是我发送数据，它不会去服务器。当我以其他形式这样做时，这不会发生。其他形式必须具有所有字段的值。但在这种形式，我也可以有空值。

我想知道如何实现这一目标？

请帮帮我。

这是我的java代码。

RequestParams params = new RequestParams();
            JSONArray req_array = new JSONArray();
            Integer estim = estimatedModified.size();
            for(int g=0;g<selectedReq.size();g++)
            {
                    JSONObject req_object = new JSONObject();
                    try {
                        req_object.put("rid", selectedReq.get(g).toString());
                        req_object.put("srid", 0);
                        req_object.put("sid", 1);
                        req_object.put("estimated_value", estimatedModified.get(g));
                        req_object.put("expected_close_date", expectedCloseModified.get(g));
                        req_object.put("others", "");
                        req_array.put(req_object);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
            }
                for (int j = 0; j < selectedSubReq.size(); j++) {
                    selectedSubReq.get(j);
                    JSONObject req_object = new JSONObject();
                    try {
                        SubRequirement temp = SubRequirement.getSubRequirement(selectedSubReq.get(j));
                        req_object.put("rid", temp.requirement_id);
                        req_object.put("srid", selectedSubReq.get(j).toString());
                        req_object.put("sid", 2);
                        req_object.put("estimated_value", 0);
                        req_object.put("expected_close_date", "null");
                        req_object.put("others", "null");
                        req_array.put(req_object);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
            }

            params.add("req", req_array.toString());
            System.out.println("ReqArray" + req_array.toString());
            AsyncClientHandler.post("projectRequirements/save/"+proj.p_id, params,
                    new AsyncHttpResponseHandler() {
                        @Override
                        public void onFailure(int statusCode,
                                Throwable error, String content) {
                            super.onFailure(statusCode, error, content);

                            Toast.makeText(getActivity(), "failiure push"+proj.p_id,Toast.LENGTH_SHORT).show();
                        }

                        @Override
                        public void onSuccess(int statusCode,
                                Header[] headers, String content) {
                            super.onSuccess(statusCode, headers, content);
                            Toast.makeText(getActivity(), "success push",Toast.LENGTH_SHORT).show();
                        }
                    });
        }

Answer 1

在json中绑定值之前，只需检查它是否为NULL然后绑定＆＃34;＆＃34; （空白字符串）else绑定原始字符串..

Answer 2

试试这个

if(json.isNull("others")) { othersStr = null; } else { othersStr = json.getString("others"); }

HttpClient client=new DefaultHttpClient(); HttpPost req=null; List<NameValuePair> reqParams = new ArrayList<NameValuePair>(); reqParams.add(new BasicNameValuePair("RequestJson", reqObj.toString())); req=new HttpPost(appUrl); req.setEntity(new UrlEncodedFormEntity(reqParams)); HttpResponse res=client.execute(req);

Android：数据未发送到服务器 - JSON包含空值

2 个答案: