NET 网络操作类代码,Asp.Net代码库,德仔网

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【Asp.Net】 NET 网络操作类
作者:Dezai.CN / 发布于2012/8/13/ 505
NET 网络操作类
<div>using System;
using System.Web;
using System.Text;
using System.IO;
using System.Net;
using System.Runtime.InteropServices;
using System.Web.UI;</div>
<div>namespace Pub.Class
{
 /// <summary>
 /// 网络操作类
 /// </summary>
 public class Net
 {
 private static object lockHelper = new object();</div>
<div> #region DownFile/ResponseFile/GetHttpFile
 /// <summary>
 /// 下载文件
 /// </summary>
 /// <param name="fileFile">文件路径（绝对路径）</param>
 /// <returns >返回文件是否存在，存在下载成功</returns>
 public static bool DownFile(string fileFile)
 {
 if (System.IO.File.Exists(fileFile)) {
 FileInfo _DownloadFile = new FileInfo(fileFile);
 HttpContext.Current.Response.Clear();
 HttpContext.Current.Response.ClearHeaders();
 HttpContext.Current.Response.Buffer = false;
 HttpContext.Current.Response.ContentType = "application/octet-stream";
 HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(_DownloadFile.FullName, System.Text.Encoding.UTF8));
 HttpContext.Current.Response.AppendHeader("Content-Length", _DownloadFile.Length.ToString());
 HttpContext.Current.Response.WriteFile(_DownloadFile.FullName);
 HttpContext.Current.Response.Flush();
 HttpContext.Current.Response.End();
 return true;
 }
<div> return false;
 }
 public static string DownFile(string url,string fileName) {
 WebClient wc = new WebClient();
 try {
 wc.DownloadFile(url,fileName);
 } catch {
 fileName = "";
 } finally {
 wc.Dispose();
 }
 return fileName;
 }
 /// <summary>
 /// 以指定的ContentType输出指定文件文件
 /// </summary>
 /// <param name="filepath">文件路径</param>
 /// <param name="filename">输出的文件名</param>
 /// <param name="filetype">将文件输出时设置的ContentType</param>
 public static void ResponseFile(string filepath, string filename, string filetype)
 {
 Stream iStream = null;
 // 缓冲区为10k
 byte[] buffer = new Byte[10000];
 // 文件长度
 int length;
 // 需要读的数据长度
 long dataToRead;
 try {
 // 打开文件
 iStream = new FileStream(filepath, FileMode.Open, FileAccess.Read,FileShare.Read);
 // 需要读的数据长度
 dataToRead = iStream.Length;
 HttpContext.Current.Response.ContentType = filetype;
 HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + filename.Trim().UrlEncode().Replace("+", " "));
 while (dataToRead > 0) {
 // 检查客户端是否还处于连接状态
 if (HttpContext.Current.Response.IsClientConnected) {
 length = iStream.Read(buffer, 0, 10000);
 HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
 HttpContext.Current.Response.Flush();
 buffer = new Byte[10000];
 dataToRead = dataToRead - length;
 } else {
 // 如果不再连接则跳出死循环
 dataToRead = -1;
 }
 }
 } catch (Exception ex) {
 HttpContext.Current.Response.Write("Error : " + ex.Message);
 } finally {
 if (iStream != null) iStream.Close();// 关闭文件
 }
 HttpContext.Current.Response.End();
 }
 /// <summary>
 /// 下载远程的文件
 /// </summary>
 /// <param name="sUrl">URL</param>
 /// <param name="sSavePath">保存到</param>
 /// <returns>成功否</returns>
 /// <example>
 /// 
 /// TimeSpan oStartTime=DateTime.Now.TimeOfDay;
 /// Response.Write(GetHttpFile("<a href="http://www.spbdev.com/download/DotNetInfo1.0.rar",Request.MapPath("RecievedFile.rar">http://www.spbdev.com/download/DotNetInfo1.0.rar",Request.MapPath("RecievedFile.rar</a>")));
 /// Response.Write("&lt;br>&lt;br>\r\n执行时间：" + DateTime.Now.TimeOfDay.Subtract(oStartTime).TotalMilliseconds.ToString() + " 毫秒");
 /// 
 /// </example>
 public bool GetHttpFile(string sUrl,string sSavePath) {
 string sException=null;
 bool bRslt=false;
 WebResponse oWebRps=null;
 WebRequest oWebRqst=WebRequest.Create(sUrl);
 oWebRqst.Timeout=50000;
 try{
 oWebRps=oWebRqst.GetResponse();
 } catch(WebException e){
 sException=e.Message.ToString();
 } catch(Exception e){
 sException=e.ToString();
 } finally {
 if(oWebRps!=null){
 BinaryReader oBnyRd=new BinaryReader(oWebRps.GetResponseStream(),System.Text.Encoding.GetEncoding("GB2312"));
 int iLen=Convert.ToInt32(oWebRps.ContentLength);
 FileStream oFileStream;
 try{
 if(File.Exists( HttpContext.Current.Request.MapPath("RecievedData.tmp")))
 oFileStream=File.OpenWrite(sSavePath);
 else
 oFileStream=File.Create(sSavePath);
 oFileStream.SetLength((Int64)iLen);
 oFileStream.Write(oBnyRd.ReadBytes(iLen),0,iLen);
 oFileStream.Close();
 } finally {
 oBnyRd.Close();
 oWebRps.Close();
 }
 bRslt=true;
 }
 }
 return bRslt;
 }
 #endregion</div>
<div> #region GetRemoteHtmlCode/GetRemoteHtmlCode2/GetRemoteHtmlCode3
 /// <summary>
 /// 获取远程文件源代码 GetRemoteHtmlCode(@"<a href="http://www.baidu.com">http://www.baidu.com</a>");
 /// </summary>
 /// <param name="Url">远程url</param>
 /// <returns></returns>
 public static string GetRemoteHtmlCode2(string Url) {
 return GetRemoteHtmlCode2(Url, Encoding.Default);
 }
 /// <summary>
 /// 获取远程文件源代码
 /// </summary>
 /// <param name="Url"></param>
 /// <param name="encoding"></param>
 /// <returns></returns>
 public static string GetRemoteHtmlCode2(string Url, System.Text.Encoding encoding) { 
 lock (lockHelper) {
 Url += (Url.IndexOf("?") >= 0 ? "&time=" : "?time=") + Rand.RndDateStr();
 string s = ""; HttpWebResponse response = null; StreamReader stream = null;
 try {
 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
 response = (HttpWebResponse) request.GetResponse();
 stream = new StreamReader(response.GetResponseStream(),encoding);
 s = stream.ReadToEnd();
 } catch {} finally {
 if (stream != null) stream.Close();
 if (response != null) response.Close();
 }
 return s;
 }
 }
 /// <summary>
 /// 获取远程文件源代码 GetRemoteHtmlCode(@"<a href="http://www.baidu.com">http://www.baidu.com</a>");
 /// </summary>
 /// <param name="strUrl">远程url</param>
 /// <returns></returns>
 public static string GetRemoteHtmlCode3(string strUrl) {
 return GetRemoteHtmlCode3(strUrl, Encoding.Default);
 }
 /// <summary>
 /// 获取远程文件源代码
 /// </summary>
 /// <param name="strUrl"></param>
 /// <param name="encoding"></param>
 /// <returns></returns>
 public static string GetRemoteHtmlCode3(string strUrl, System.Text.Encoding encoding) 
 { 
 lock (lockHelper) {
 strUrl += (strUrl.IndexOf("?") >= 0 ? "&time=" : "?time=") + Rand.RndDateStr();
 StringBuilder Html = new StringBuilder(); 
 HttpWebResponse myRp = null; StreamReader sr = null; Stream mystr = null; 
 try { 
 HttpWebRequest myRq = (HttpWebRequest)HttpWebRequest.Create(strUrl); 
 myRq.AllowAutoRedirect = true; 
 myRq.Timeout = 1000*60*3; 
 myRq.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"; 
 myRq.Referer=strUrl; 
 myRp = (HttpWebResponse)myRq.GetResponse(); 
 mystr = myRp.GetResponseStream(); 
 sr = new StreamReader(mystr,encoding); 
 while(sr.Peek()!=-1) { Html.Append(sr.ReadToEnd()); } 
 } catch { 
 return "-1"; 
 } finally {
 if (sr!=null) sr.Close(); 
 if (mystr!=null) mystr.Close(); 
 if (myRp!=null) myRp.Close(); 
 }
 return Html.ToString();
 }
 } 
 /// <summary>
 /// 获取远程文件源代码 GetRemoteHtmlCode(@"<a href="http://www.baidu.com">http://www.baidu.com</a>");
 /// </summary>
 /// <param name="strUrl">远程url</param>
 /// <returns></returns>
 public static string GetRemoteHtmlCode4(string strUrl) {
 return GetRemoteHtmlCode4(strUrl, Encoding.Default);
 }
 /// <summary>
 /// 获取远程文件源代码
 /// </summary>
 /// <param name="Url"></param>
 /// <param name="encoding"></param>
 /// <returns></returns>
 public static string GetRemoteHtmlCode4(string Url, System.Text.Encoding encoding) 
 {
 lock (lockHelper) {
 Url += (Url.IndexOf("?") >= 0 ? "&time=" : "?time=") + Rand.RndDateStr();
 WebClient wc = new WebClient(); 
 wc.Credentials = CredentialCache.DefaultCredentials; 
 Byte[] pageData = wc.DownloadData(Url); 
 string content = encoding.GetString(pageData);
 wc.Dispose();
 return content;
 }
 }
 /// <summary>
 /// 获取远程文件源代码 GetRemoteHtmlCode(@"<a href="http://www.baidu.com">http://www.baidu.com</a>");
 /// </summary>
 /// <param name="strUrl">远程url</param>
 /// <returns></returns>
 public static string GetRemoteHtmlCode5(string strUrl) {
 return GetRemoteHtmlCode5(strUrl, Encoding.Default);
 }
 /// <summary>
 /// 获取远程文件源代码
 /// </summary>
 /// <param name="Url"></param>
 /// <param name="encoding"></param>
 /// <returns></returns>
 public static string GetRemoteHtmlCode5(string Url, System.Text.Encoding encoding) 
 {
 lock (lockHelper) {
 Url += (Url.IndexOf("?") >= 0 ? "&time=" : "?time=") + Rand.RndDateStr();
 string postString = "";
 WebClient webClient = new WebClient();
 webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
 byte[] postData = Encoding.ASCII.GetBytes(postString);
 byte[] responseData = webClient.UploadData(Url, "POST", postData);
 string srcString = encoding.GetString(responseData);
 webClient.Dispose();
 return srcString;
 }
 }
 #endregion</div>
<div> #region TransHtml
 /// <summary>
 /// 转换为静态html
 /// </summary>
 public static void TransHtml(string path, string outpath,System.Text.Encoding encoding) {
 lock (lockHelper) {
 FileStream stream = null;
 StringWriter writer = new StringWriter();
 try {
 Page page = new Page();
 page.Server.Execute(path, writer);
 if (File.Exists(outpath)) {
 File.Delete(outpath);
 stream = File.Create(outpath);
 } else {
 stream = File.Create(outpath);
 }
 byte[] bytes = encoding.GetBytes(writer.ToString());
 stream.Write(bytes, 0, bytes.Length);
 } catch {} finally{
 if (writer != null) { writer.Close(); writer.Dispose(); }
 if (stream != null) { stream.Close(); stream.Dispose(); }
 }
 }
 }
 #endregion
 }
}
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