【asp】asp.net 需要登陆的网站上下载网页源代码和文件-net-需要登陆-下载

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asp.net 需要登陆的网站上下载网页源代码和文件

using System;
using System.IO;
using System.Net;
using System.Web;

public class SRWebClient
{
CookieContainer cookie;
public SRWebClient()
{
cookie=new CookieContainer();
}

/// <TgData>
/// <Alias>下载Web源代码</Alias>
/// </TgData>
public string DownloadHtml(string URL)
{
HttpWebRequest request=HttpWebRequest.Create(URL) as HttpWebRequest;
request.CookieContainer=cookie;
request.AllowAutoRedirect=false;

WebResponse res=request.GetResponse();
string r="";

StreamReader S1=new StreamReader(res.GetResponseStream(), System.Text.Encoding.Default);
try
{
r=S1.ReadToEnd();
}
catch (Exception er)
{
Log l=new Log();
l.writelog("下载Web错误", er.ToString());
}
finally
{
res.Close();
S1.Close();
}

return r;
}

/// <TgData>
/// <Alias>下载文件</Alias>
/// </TgData>
public long DownloadFile(string FileURL, string FileSavePath)
{
long Filelength=0;
HttpWebRequest req=HttpWebRequest.Create(FileURL) as HttpWebRequest;

req.CookieContainer=cookie;
req.AllowAutoRedirect=true;

HttpWebResponse res=req.GetResponse() as HttpWebResponse;
System.IO.Stream stream=res.GetResponseStream();
try
{
Filelength=res.ContentLength;

byte[] b=new byte[512];

int nReadSize=0;
nReadSize=stream.Read(b, 0, 512);

System.IO.FileStream fs=System.IO.File.Create(FileSavePath);
try
{
while (nReadSize > 0)
{
fs.Write(b, 0, nReadSize);
nReadSize=stream.Read(b, 0, 512);
}
}
finally
{
fs.Close();
}
}
catch (Exception er)
{
Log l=new Log();
l.writelog("下载文件错误", er.ToString());
}
finally
{
res.Close();
stream.Close();
}

return Filelength;
}

/// <TgData>
/// <Alias>提交数据</Alias>
/// </TgData>
public void Request(string RequestPageURL, RequestData Data)
{
string StrUrl=RequestPageURL;
HttpWebRequest request=HttpWebRequest.Create(StrUrl) as HttpWebRequest;
HttpWebResponse response;

string postdata=Data.GetData();
request.Referer=RequestPageURL;
request.AllowAutoRedirect=false;
request.UserAgent="Mozilla/4.0 (compatible; MSIE 6.01; Windows NT 5.0)";
request.CookieContainer=cookie;

Uri u=new Uri(StrUrl);

if (postdata.Length > 0) //包含要提交的数据　就使用Post方式
{
//作为表单请求
request.ContentType="application/x-www-form-urlencoded";
//方式就是Post
request.Method="POST";

//把提交的数据换成字节数组
Byte[] B=System.Text.Encoding.Default.GetBytes(postdata);
request.ContentLength=B.Length;

Stream SW=request.GetRequestStream(); //开始提交数据
SW.Write(B, 0, B.Length);
SW.Close();
}

response=request.GetResponse() as HttpWebResponse;
response.Close();
}
}

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