Java HttpURLConnection - POST用Cookie [英] Java HttpURLConnection - POST with Cookie

问题描述

我正在尝试发送带有Cookie的信息。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（）; 
 
 //将请求发送到服务器
 //conn.connect（）; 
} catch（MalformedURLException e）{
 e.printStackTrace（）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
  

问题是请求没有发送cookie。如果我只做：
conn.connect（）;并且不发送数据，Cookie被发送确定。
我不能检查发生了什么，因为连接是thorugh SSL。根据 URLConnection javadoc：

 在连接远程对象之后，下列方法用于访问头字段和
内容：
 
 * getContent 
 * getHeaderField 
 * getInputStream 
 * getOutputStream 
  

您确认在上面的测试用例中，请求到达服务器吗？我看到你有 connect（）之后 getOutputStream（）和注释除了。如果您取消注释并在 getOutputStream（）之前向上移动，会发生什么？

I´m trying to send a post request with cookies. This is the code:

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();
}

The problem is the request is sent without the cookies. If I only make: conn.connect(); and don´t send data, the cookies are sent OK. I can´t check exactly what is happening, because the connection is thorugh SSL. I only check the response.

解决方案

According to the 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

Have you confirmed that in your test case above the request is getting to the server at all? I see you have the call to connect() after getOutputStream() and commented-out besides. What happens if you uncomment it and move up before the call to getOutputStream() ?

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