網(wǎng)頁自動登錄（提交Post內(nèi)容）的用途很多，如驗證身份,、程序升級、網(wǎng)絡(luò)投票等,，以下是用C#實現(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現(xiàn)：
1、WebBrowser是個"迷你"瀏覽器,，其特點是Post時不用關(guān)心Cookie、內(nèi)置JS等問題
WebBrowser是VS2005新提供的組件（其實就是封裝了IE接口）,，實現(xiàn)POST功能一般在webBrowser的
DocumentCompleted中分析HtmlDocument 來實現(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，特點是可以自設(shè)代理,，缺點是對COOKIE的控制
WebClient的運行全在后臺,，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:///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)化成二進制數(shù)組
((WebClient)sender).UploadDataAsync(new Uri("http:///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./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,，實現(xiàn)起來也不難。
