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原文地址:http://www.cnblogs.com/ceachy/articles/CSharp_Retrive_Page_Document.html
搜索网络,发现C#通常有三种方法获取网页内容,使用WebClient、WebBrowser或者HttpWebRequest/HttpWebResponse。。。
方法一:使用WebClient (引用自:http://fbljava.blog.163.com/blog/static/265211742008712105145244/)
- static void Main(string[] args)
- {
- try {
- WebClient MyWebClient = new WebClient();
- MyWebClient.Credentials = CredentialCache.DefaultCredentials;//获取或设置用于向Internet资源的请求进行身份验证的网络凭据
- Byte[] pageData = MyWebClient.DownloadData(“[url]http://www.163.com[/url]”); //从指定网站下载数据
- string pageHtml = Encoding.Default.GetString(pageData); //如果获取网站页面采用的是GB2312,则使用这句
- //string pageHtml = Encoding.UTF8.GetString(pageData); //如果获取网站页面采用的是UTF-8,则使用这句
- Console.WriteLine(pageHtml);//在控制台输入获取的内容
- using (StreamWriter sw = new StreamWriter("c:\\test\\ouput.html"))//将获取的内容写入文本
- {
- sw.Write(pageHtml);
- }
- Console.ReadLine(); //让控制台暂停,否则一闪而过了
- }
- catch(WebException webEx) {
- Console.WriteLine(webEx.Message.ToString());
- }
- }
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方法二:使用WebBrowser (引用自:http://topic.csdn.net/u/20091225/14/4ea221cd-4c1e-4931-a6db-1fd4ee7398ef.html)
- WebBrowser web = new WebBrowser();
- web.Navigate("[url=http://www.xjflcp.com/ssc/]http://www.xjflcp.com/ssc/[/url]");
- web.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(web_DocumentCompleted);
- void web_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
- {
- WebBrowser web = (WebBrowser)sender;
- HtmlElementCollection ElementCollection = web.Document.GetElementsByTagName("Table");
- foreach (HtmlElement item in ElementCollection)
- {
- File.AppendAllText("Kaijiang_xj.txt", item.InnerText);
- }
- }
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方法三:使用HttpWebRequest/HttpWebResponse (引用自:http://hi.baidu.com/onlyafar/blog/item/7ac4c6bf92d4810019d81f98.html)
- HttpWebRequest httpReq;
- HttpWebResponse httpResp;
- string strBuff = "";
- char[] cbuffer = new char[256];
- int byteRead = 0;
- string filename = @"c:\log.txt";
- ///定义写入流操作
- public void WriteStream()
- {
- Uri httpURL = new Uri(txtURL.Text);
- ///HttpWebRequest类继承于WebRequest,并没有自己的构造函数,需通过WebRequest的Creat方法 建立,并进行强制的类型转换
- httpReq = (HttpWebRequest)WebRequest.Create(httpURL);
- ///通过HttpWebRequest的GetResponse()方法建立HttpWebResponse,强制类型转换
- httpResp = (HttpWebResponse) httpReq.GetResponse();
- ///GetResponseStream()方法获取HTTP响应的数据流,并尝试取得URL中所指定的网页内容
- ///若成功取得网页的内容,则以System.IO.Stream形式返回,若失败则产生ProtoclViolationException错 误。在此正确的做法应将以下的代码放到一个try块中处理。这里简单处理
- Stream respStream = httpResp.GetResponseStream();
- ///返回的内容是Stream形式的,所以可以利用StreamReader类获取GetResponseStream的内容,并以
- StreamReader类的Read方法依次读取网页源程序代码每一行的内容,直至行尾(读取的编码格式:UTF8)
- StreamReader respStreamReader = new StreamReader(respStream,Encoding.UTF8);
- byteRead = respStreamReader.Read(cbuffer,0,256);
- while (byteRead != 0)
- {
- string strResp = new string(cbuffer,0,byteRead);
- strBuff = strBuff + strResp;
- byteRead = respStreamReader.Read(cbuffer,0,256);
- }
- respStream.Close();
- txtHTML.Text = strBuff;
- }
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