Android HttpURLConnection POST 没有数据被发送

Question

我在本地主机上运行 ASP.net JSON 服务。我正在从 Android 应用程序向服务器发送 JSON POST 请求。服务器正在接收连接，但没有 POST 数据(我通过设置一个断点来确认这一点，该断点在我从 Android 应用程序 POST 后命中)。我得到的 HttpURLConnection 响应代码是 200 OK。但是，服务器未接收到数据。我不确定是否正在发送任何数据。我的 android 代码是(包装在 AsyncTask 中):

public void makeHttpRequest(String verb, String serverAddr, String postBody)
    {
        HttpURLConnection urlConnection = null;
        OutputStream out = null;
        try {
            serverAddr = "http://10.0.2.2:4617/parent/dummy";
            URL url = new URL(serverAddr);
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setDoOutput(true);
            urlConnection.setChunkedStreamingMode(0);
            urlConnection.setRequestProperty("Transfer-Encoding","chunked");
            urlConnection.setRequestProperty("Content-Type", "application/json;charset=UTF-8");

            urlConnection.connect();

            out = new BufferedOutputStream(urlConnection.getOutputStream());
            out.write(postBody.getBytes("UTF-8"));

            int responseCode = urlConnection.getResponseCode();
            System.out.println("HTTP Response Code: " + responseCode + " | " + urlConnection.getResponseMessage());
        }
        catch (MalformedURLException mal) {
            //
        }
        catch (IOException ioe) {
            //
        }
        finally {
            if (out != null) {
                try {
                    out.close();
                } catch(IOException e) {

                }
            }

            if (urlConnection != null)
                urlConnection.disconnect();
        }

    }

C#/ASP.NET 服务契约。 Parent 的实例为 null，但应包含 POST 发送的数据:

[ServiceContract]
    public interface IRestServiceParent
    {

        [WebInvoke(UriTemplate = "{dummy}", Method = "POST", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
        Parent PostParent(string dummy, Parent instance);
    }

public Parent PostParent(string dummy, Parent instance)
        {
            var result = MasterStorageStore.Instance.PostParent(instance);
            if (result == null) return emptyParent;

            return NewCopy(result);
        }

Answer 1

也许你应该尝试在 out.write(postBody.getBytes("UTF-8")); 之后添加一个 out.flush();。