我在android上关于HttpURLConnections的问题。 （cast-URLConnection，url.openConnection，getOutPutStream（）..）

Question

我有关于创建httpurlconnection（或httpsurlconnection）的问题。实际上这是关于在转换url.openconnection之后设置连接头。在运行相同的代码之前没有运行。我无法理解。 （例外：已连接......或类似..）

有时会运行直到 httpConn.getOutPutStream（）; 此时它会出现错误“java.net.ProtocolException：OutputStream不可用，因为请求标头已经发送！”

我的错在哪里？

在我使用代码之前：所有代码都是here（我还有关于This Code的另一个问题）

URL url = new URL(getUrl());
URLConnection conn = url.openConnection();
HttpURLConnection httpConn=(HttpURLConnection)conn; /*or HttpsURLConnection*/
httpConn.set...
...
httpConn.connect();
...

我尝试在转换后设置一些设置，但结果是一样的。 conn.set ..正在运作，但在施法后我无法设置任何东西......

更改代码：

        URL url = new URL(getUrl());
        conn = url.openConnection();
        conn.setAllowUserInteraction(false);
        conn.setConnectTimeout(10000);
        conn.setRequestProperty("Accept-Charset", "utf-8");
        conn.setRequestProperty("Content-Type",
                "text/xml; charset=utf-8");
        conn.setRequestProperty("SOAPAction",
                "http://tempuri.org/IAuthenticationServiceNew/Authenticate");
        conn.setRequestProperty("Software-Version", AppData.VERSION);
        conn.setDoOutput(true);
        httpConn = (HttpsURLConnection) conn;
        httpConn.setChunkedStreamingMode(getParams().getBytes("UTF8").length);
        httpConn.setInstanceFollowRedirects(true);

        httpConn.connect();
        os = httpConn.getOutputStream();
        os.write(getParams().getBytes("UTF8"));

Answer 1

这是对的！
         “httpConn.setInstanceFollowRedirects（true）”连接并向服务器发送标头。我关闭了这段代码。

        URL url = new URL(getUrl());
        httpConn = (HttpURLConnection) url.openConnection();
        httpConn.setDoInput(true);
        httpConn.setDoOutput(true);
        httpConn.setAllowUserInteraction(false);
        httpConn.setUseCaches(false);
        httpConn.setConnectTimeout(10000);
        httpConn.setRequestProperty("Accept-Charset", "utf-8");
        httpConn.setRequestProperty("Content-Type",
                "text/xml; charset=utf-8");
        httpConn.setRequestProperty("SOAPAction",
                "http://tempuri.org/IAuthenticationServiceNew/"
                        + conTypeString);
        httpConn.setRequestProperty("Software-Version", AppData.VERSION);
        httpConn.setRequestMethod("POST");
        httpConn.setChunkedStreamingMode(0);
        os = httpConn.getOutputStream();
        os.write(getParams().getBytes("UTF8"));