c# - WebClient中如何获取Cookie的JSESSIONID

Question

我已经实现了以下方法来从 Cookies 中获取 JsessioniD。网站使用表单例份验证。

这是我实现的。

public override void ViewDidLoad ()
    {
        base.ViewDidLoad ();
        using(var client= new CookieAwareWebClient())
        {
           var values= new NameValueCollection
           {
             {"username","admin"},
             {"password","admin"},
           };
            client.UploadValues("myURL/j_security_check",values);
            WebHeaderCollection myWebHeaderCollection = client.ResponseHeaders;

            for (int i=0; i < myWebHeaderCollection.Count; i++)             
Console.WriteLine ("\t" + myWebHeaderCollection.GetKey(i) + " = " + myWebHeaderCollection.Get(i));
        };
    }

CookieAwareWebClient类实现如下:

public class CookieAwareWebClient : WebClient
  {

   public CookieAwareWebClient()
    {
       CookieContainer = new CookieContainer();
    }

    public CookieContainer CookieContainer { get; private set; }

    protected override WebRequest GetWebRequest(Uri address)
    {
        var request = (HttpWebRequest)base.GetWebRequest(address);
        request.CookieContainer = CookieContainer;
        return request;
    }
  }

我的问题是如何只获取JsessionID？

Answer 1

您可以将响应 cookie 存储在单独的属性中:

public class CookieAwareWebClient : WebClient
{
    public CookieAwareWebClient()
    {
        CookieContainer = new CookieContainer();
        this.ResponseCookies = new CookieCollection();
    }

    public CookieContainer CookieContainer { get; private set; }
    public CookieCollection ResponseCookies { get; set; }

    protected override WebRequest GetWebRequest(Uri address)
    {
        var request = (HttpWebRequest)base.GetWebRequest(address);
        request.CookieContainer = CookieContainer;
        return request;
    }

    protected override WebResponse GetWebResponse(WebRequest request)
    {
        var response = (HttpWebResponse)base.GetWebResponse(request);
        this.ResponseCookies = response.Cookies;
        return response;
    }
}

然后:

client.UploadValues("myURL/j_security_check",values);
Cookie jSessionID = client.ResponseCookies["JSESSIONID"];
if (jSessionID != null)
{
    // The server set a cookie called JSESSIONID, you can use it here:
    string value = jSessionID.Value;
}