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:
- <font size="2"> 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
- }</font>
复制代码 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:
- <font size="2">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);
- ......
- }
- }</font>
复制代码 3、HttpWebRequest较为低层,能实现的功能较多,Cookie操作也很简单
- <font color="#000000" size="2"> 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。</font>
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