這篇文章主要介紹了C#實(shí)現(xiàn)的三種模擬自動登錄和提交POST信息的方法,分別列舉了WebBrowser、WebClient及HttpWebRequest實(shí)現(xiàn)自動登錄及提交POST的相關(guān)實(shí)現(xiàn)技巧,具有一定參考借鑒價值,需要的朋友可以參考下
本文實(shí)例講述了C#實(shí)現(xiàn)的三種模擬自動登錄和提交POST信息的方法。分享給大家供大家參考,具體如下:
網(wǎng)頁自動登錄(提交Post內(nèi)容)的用途很多,如驗(yàn)證身份、程序升級、網(wǎng)絡(luò)投票等,以下是用C#實(shí)現(xiàn)的方法。
網(wǎng)頁自動登錄和提交POST信息的核心就是分析網(wǎng)頁的源代碼(HTML),在C#中,可以用來提取網(wǎng)頁HTML的組件比較多,常用的用WebBrowser、WebClient、HttpWebRequest這三個。以下就分別用這三種方法來實(shí)現(xiàn):
1、WebBrowser是個"迷你"瀏覽器,其特點(diǎn)是Post時不用關(guān)心Cookie、內(nèi)置JS等問題
WebBrowser是VS2005新提供的組件(其實(shí)就是封裝了IE接口),實(shí)現(xiàn)POST功能一般在webBrowser的DocumentCompleted中分析HtmlDocument 來實(shí)現(xiàn),代碼如下:
- HtmlElement ClickBtn =null;
- if (e.Url.ToString().ToLower().IndexOf("xxx.htm") > 0) //登陸頁面
- {
- HtmlDocument doc = webBrowser1.Document;
- for (int i = 0; i < doc.All.Count ; i++)
- {
- if (doc.All[i].TagName.ToUpper().Equals("INPUT"))
- {
- switch (doc.All[i].Name)
- {
- case "userCtl":
- doc.All[i].InnerText = "user01";
- break;
- case "passCt1":
- doc.All[i].InnerText = "mypass";
- break;
- case "B1":
- ClickBtn = doc.All[i]; //提交按鈕
- break;
- }
- }
- }
- ClickBtn.InvokeMember("Click"); //執(zhí)行按扭操作
- }
2、WebClient封裝了HTTP的一些類,操作簡單,相較于webBrowser,特點(diǎn)是可以自設(shè)代理,缺點(diǎn)是對COOKIE的控制
WebClient的運(yùn)行全在后臺,并且提供了異步操作的能力,這樣很方便并發(fā)多個任務(wù),然后等待結(jié)果的返回,再逐個處理。多任務(wù)異步調(diào)用的代碼如下:
- private void StartLoop(int ProxyNum)
- {
- WebClient [] wcArray = new WebClient[ProxyNum]; //初始化
- for (int idArray = 0; idArray< ProxyNum;idArray++)
- {
- wcArray[idArray] = new WebClient();
- wcArray[idArray].OpenReadCompleted += new OpenReadCompletedEventHandler(Pic_OpenReadCompleted2);
- wcArray[idArray].UploadDataCompleted += new UploadDataCompletedEventHandler(Pic_UploadDataCompleted2);
- try
- {
- ......
- wcArray[idArray].Proxy = new WebProxy(proxy[1], port);
- wcArray[idArray].OpenReadAsync(new Uri("http://xxxx.com.cn/tp.asp?Id=129")); //打開WEB;
- proxy = null;
- }
- catch
- {
- }
- }
- }
- private void Pic_OpenReadCompleted2(object sender, OpenReadCompletedEventArgs e)
- {
- if (e.Error == null)
- {
- string textData = new StreamReader(e.Result, Encoding.Default).ReadToEnd(); //取返回信息
- .....
- String cookie = ((WebClient)sender).ResponseHeaders["Set-Cookie"];
- ((WebClient)sender).Headers.Add("Content-Type", "application/x-www-form-urlencoded");
- ((WebClient)sender).Headers.Add("Accept-Language", "zh-cn");
- ((WebClient)sender).Headers.Add("Cookie", cookie);
- string postData = "......"
- byte[] byteArray = Encoding.UTF8.GetBytes(postData); // 轉(zhuǎn)化成二進(jìn)制數(shù)組
- ((WebClient)sender).UploadDataAsync(new Uri("http://xxxxxxy.com.cn/tp.asp?Id=129"), "POST", byteArray);
- }
- }
- private void Pic_UploadDataCompleted2(object sender, UploadDataCompletedEventArgs e)
- {
- if (e.Error == null)
- {
- string returnMessage = Encoding.Default.GetString(e.Result);
- ......
- }
- }
3、HttpWebRequest較為低層,能實(shí)現(xiàn)的功能較多,Cookie操作也很簡單
- private bool PostWebRequest()
- {
- CookieContainer cc = new CookieContainer();
- string pos tData = "user=" + strUser + "&pass=" + strPsd;
- byte[] byteArray = Encoding.UTF8.GetBytes(postData); // 轉(zhuǎn)化
- HttpWebRequest webRequest2 = (HttpWebRequest)WebRequest.Create(new Uri("http://www.xxxx.com/chk.asp"));
- webRequest2.CookieContainer = cc;
- webRequest2.Method = "POST";
- webRequest2.ContentType = "application/x-www-form-urlencoded";
- webRequest2.ContentLength = byteArray.Length;
- Stream newStream = webRequest2.GetRequestStream();
- // Send the data.
- newStream.Write(byteArray, 0, byteArray.Length); //寫入?yún)?shù)
- newStream.Close();
- HttpWebResponse response2 = (HttpWebResponse)webRequest2.GetResponse();
- StreamReader sr2=new StreamReader(response2.GetResponseStream(), Encoding.Default);
- string text2 = sr2.ReadToEnd();
- ......
- }
HttpWebRequest同樣提供了異步操作,有興趣的朋友自己查MSDN,實(shí)現(xiàn)起來也不難。
客戶端程序模擬post提交的用處很多,往往用于不同平臺間的接口交互,
樓主總結(jié)的很好,不過少了一中方法:
- WebRequest request = WebRequest.Create(Url);
- request.Method = "POST";
- request.Timeout = 100000;
- request.GetRequestStream().Close();
- WebResponse response = request.GetResponse();
- StreamReader sr = new StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8);
- webInfo = sr.ReadToEnd();
- sr.Close();
也挺方便
希望本文所述對大家C#程序設(shè)計(jì)有所幫助。
新聞熱點(diǎn)
疑難解答
圖片精選