Java HttpURLConnection - 带 Cookie 的 POST

Question

我正在尝试发送带有 cookie 的发布请求。这是代码：

try {

    String query = URLEncoder.encode("key", "UTF-8") + "=" + URLEncoder.encode("value", "UTF-8");
    String cookies = "session_cookie=value";
    URL url = new URL("https://myweb");
    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();

    conn.setRequestProperty("Cookie", cookies);
    conn.setRequestMethod("POST");
    conn.setDoInput(true);
    conn.setDoOutput(true);

    DataOutputStream out = new DataOutputStream(conn.getOutputStream());
    out.writeBytes(query);
    out.flush();
    out.close();

    BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String decodedString;
    while ((decodedString = in.readLine()) != null) {
        System.out.println(decodedString);
    }
    in.close();

    // Send the request to the server
    //conn.connect();
} catch (MalformedURLException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

问题是发送的请求没有 cookie。如果我只做： conn.connect();并且不发送数据，cookie 发送正常。 我无法准确检查发生了什么，因为连接是通过 SSL 进行的。我只检查回复。

Answer 1

根据URLConnection javadoc：

The following methods are used to access the header fields and the 
contents AFTER the connection is made to the remote object:

* getContent
* getHeaderField
* getInputStream
* getOutputStream

您是否确认在上面的测试用例中请求完全到达了服务器？我看到您在 getOutputStream() 之后调用了 connect() 并注释掉了。如果您在调用 getOutputStream() 之前取消注释并向上移动，会发生什么情况？