使用HttpWebRequest时保持会话

在我的项目中，我使用的是C＃app客户端和tomcat6 Web应用程序服务器。 我在C＃客户端编写了这个代码片段：

public bool isServerOnline() { Boolean ret = false; try { HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(VPMacro.MacroUploader.SERVER_URL); req.Method = "HEAD"; req.KeepAlive = false; HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); if (resp.StatusCode == HttpStatusCode.OK) { // HTTP = 200 - Internet connection available, server online ret = true; } resp.Close(); return ret; } catch (WebException we) { // Exception - connection not available Log.e("InternetUtils - isServerOnline - " + we.Status); return false; } } 

每次我调用此方法时，我都会在服务器端获得一个新会话。 我想这是因为我应该在我的客户端使用HTTP cookie。 但我不知道该怎么做，你能帮助我吗？

Answer 1

您必须使用CookieContainer并在调用之间保留实例。

 private CookieContainer cookieContainer = new CookieContainer(); public bool isServerOnline() { Boolean ret = false; try { HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(VPMacro.MacroUploader.SERVER_URL); req.CookieContainer = cookieContainer; // <= HERE req.Method = "HEAD"; req.KeepAlive = false; HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); if (resp.StatusCode == HttpStatusCode.OK) { // HTTP = 200 - Internet connection available, server online ret = true; } resp.Close(); return ret; } catch (WebException we) { // Exception - connection not available Log.e("InternetUtils - isServerOnline - " + we.Status); return false; } }