本文实例讲述了C#实现的三种模拟自动登录和提交POST信息的方法。分享给大家供大家参考,具体如下:
网页自动登录(提交Post内容)的用途很多,如验证身份、程序升级、网络投票等,以下是用C#实现的方法。
网页自动登录和提交POST信息的核心就是分析网页的源代码(HTML),在C#中,可以用来提取网页HTML的组件比较多,常用的用WebBrowser、WebClient、HttpWebRequest这三个。以下就分别用这三种方法来实现:
1、WebBrowser是个"迷你"浏览器,其特点是Post时不用关心Cookie、内置JS等问题
WebBrowser是VS2005新提供的组件(其实就是封装了IE接口),实现POST功能一般在webBrowser的DocumentCompleted中分析HtmlDocument 来实现,代码如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
HtmlElement ClickBtn = null ;
if (e.Url.ToString().ToLower().IndexOf( "xxx.htm" ) > 0) //登陆页面
{
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]; //提交按钮
break ;
}
}
}
ClickBtn.InvokeMember( "Click" ); //执行按扭操作
}
|
2、WebClient封装了HTTP的一些类,操作简单,相较于webBrowser,特点是可以自设代理,缺点是对COOKIE的控制
WebClient的运行全在后台,并且提供了异步操作的能力,这样很方便并发多个任务,然后等待结果的返回,再逐个处理。多任务异步调用的代码如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
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" )); //打开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); // 转化成二进制数组
((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较为低层,能实现的功能较多,Cookie操作也很简单
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
private bool PostWebRequest()
{
CookieContainer cc = new CookieContainer();
string pos tData = "user=" + strUser + "&pass=" + strPsd;
byte [] byteArray = Encoding.UTF8.GetBytes(postData); // 转化
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); //写入参数
newStream.Close();
HttpWebResponse response2 = (HttpWebResponse)webRequest2.GetResponse();
StreamReader sr2= new StreamReader(response2.GetResponseStream(), Encoding.Default);
string text2 = sr2.ReadToEnd();
......
}
|
HttpWebRequest同样提供了异步操作,有兴趣的朋友自己查MSDN,实现起来也不难。
客户端程序模拟post提交的用处很多,往往用于不同平台间的接口交互,
楼主总结的很好,不过少了一中方法:
1
2
3
4
5
6
7
8
|
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
希望本文所述对大家C#程序设计有所帮助。