C#获取网页内容的三种方式 - 四联光电智能照明论坛

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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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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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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