java - Android中如何使用HttpURLConnection来发布数据？

Question

我想通过流将 json 数据发送到服务器，但我很难让它工作。 我有以下方法:

String data = "{\"id\":\"2633\",\"f_name\":\"Test\",\"l_name\":\"Aplikace\",\"city\":\"Nymburk\",\"address\":\"Testovaci 123456789 xyz\",\"psc\":\"288 02\"}";


private String httpPost(String urlString, String data, String session_per) {
    StringBuffer sb = new StringBuffer("");
    String s1 = "";
    try {
        URL url = new URL(urlString);
        String s2 = "";
        HttpURLConnection httpurlconnection = (HttpURLConnection)url.openConnection();
        httpurlconnection.setDoInput(true);
        httpurlconnection.setDoOutput(true);
        httpurlconnection.setUseCaches(false);
        httpurlconnection.setRequestMethod("POST");
        httpurlconnection.setRequestProperty("Cookie",session_per);
        httpurlconnection.setRequestProperty("Authentication-Token", GlobalVar.KLIC);
        httpurlconnection.setRequestProperty("Content-type", "application/json");
        httpurlconnection.setAllowUserInteraction(false);

        OutputStreamWriter outStrWrt = new OutputStreamWriter(httpurlconnection.getOutputStream());
        outStrWrt.write(data);
        outStrWrt.close();

        String s3 = httpurlconnection.getResponseMessage();
        //dataoutputstream.flush();
        //dataoutputstream.close();
        InputStream inputstream = httpurlconnection.getInputStream();
        String line = "";
        BufferedReader br = new BufferedReader(new InputStreamReader(inputstream));
        int i;
        while( (line = br.readLine()) != null) {
            sb.append(line);
        }
        s1 = sb.toString();
    }
    catch(Exception ex)
    {
        ex.printStackTrace();
        s1 = "";
    }
    return s1;
}

谁能告诉我为什么这不起作用？ cookies等都是正确的。我错过了什么重要的事情吗？这就像我正在尝试的第六种方法，我开始变得绝望:D 谢谢!

编辑:

连接成功，服务器有响应，但没有更新用户数据，就像 json 没有正确到达服务器一样。

如果我的 Java 代码正确，则可能存在服务器端问题。

Answer 1

尝试使用flush()方法，在读取所有字节之前不要关闭此输出流

outStrWrt.flush();
InputStream inputstream=httpurlconnection.getInputStream();