Asp.Net常用文件操作方法

using System;using System.Collections.Generic;using System.Text;using System.IO;using System.Web;using System.Net;using System.Threading;using EcmaScript.NET;using Yahoo.Yui.Compressor;using System.Xml;using System.Data.OleDb;using System.Data;using System.Collections;using System.Web.UI.HtmlControls;using System.Drawing.Imaging;namespace Common{public class fileHelper{#region 下载文件/// <summary>///功能说明：文件下载类--不管是什么格式的文件,都能够弹出打开/保存窗口,///包括使用下载工具下载///继承于IHttpHandler接口，可以用来自定义HTTP 处理程序同步处理HTTP的请求/// </summary>/// <param name="context"></param>public static void ProcessRequest(HttpContext context){HttpResponse Response = context.Response;HttpRequest Request = context.Request;System.IO.Stream iStream = null;byte[] buffer = new Byte[10240];int length;long dataToRead;try{string filename = Request["fn"];string filepath = HttpContext.Current.Server.MapPath("~/") + filename; //待下载的文件路径iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,System.IO.FileAccess.Read, System.IO.FileShare.Read);Response.Clear();dataToRead = iStream.Length;long p = 0;if (Request.Headers["Range"] != null){Response.StatusCode = 206;p = long.Parse(Request.Headers["Range"].Replace("bytes=", "").Replace("-", ""));}if (p != 0){Response.AddHeader("Content-Range", "bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString());}Response.AddHeader("Content-Length", ((long)(dataToRead - p)).ToString());Response.ContentType = "application/octet-stream";Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(System.Text.Encoding.GetEncoding(65001).GetBytes(Path.GetFileName(filename))));iStream.Position = p;dataToRead = dataToRead - p;while (dataToRead > 0){if (Response.IsClientConnected){length = iStream.Read(buffer, 0, 10240);Response.OutputStream.Write(buffer, 0, length);Response.Flush();buffer = new Byte[10240];dataToRead = dataToRead - length;}else{dataToRead = -1;}}}catch (Exception ex){Response.Write("Error : " + ex.Message);}finally{if (iStream != null){iStream.Close();}Response.End();}}/// <summary>/// 下载方法二/// </summary>/// <param name="_Request"></param>/// <param name="_Response"></param>/// <param name="_fileName"></param>/// <param name="_fullPath"></param>/// <param name="_speed"></param>/// <returns></returns>public static bool ResponseFile(HttpRequest _Request, HttpResponse _Response, string _fileName, string _fullPath, long _speed){try{FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);BinaryReader br = new BinaryReader(myFile);try{_Response.AddHeader("Accept-Ranges", "bytes");_Response.Buffer = false;long fileLength = myFile.Length;long startBytes = 0;double pack = 10240; //10K bytes//int sleep = 200; //每秒5次 即5*10K bytes每秒int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;if (_Request.Headers["Range"] != null){_Response.StatusCode = 206;string[] range = _Request.Headers["Range"].Split(new char[] { '=', '-' });startBytes = Convert.ToInt64(range[1]);}_Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());if (startBytes != 0){//Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));}_Response.AddHeader("Connection", "Keep-Alive");_Response.ContentType = "application/octet-stream";_Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(_fileName, System.Text.Encoding.UTF8));br.BaseStream.Seek(startBytes, SeekOrigin.Begin);int maxCount = (int)Math.Floor((fileLength - startBytes) / pack) + 1;for (int i = 0; i < maxCount; i++){if (_Response.IsClientConnected){_Response.BinaryWrite(br.ReadBytes(int.Parse(pack.ToString())));Thread.Sleep(sleep);}else{i = maxCount;}}}catch{return false;}finally{br.Close();myFile.Close();}}catch{return false;}return true;}/// <summary>/// 从图片地址下载图片到本地磁盘/// </summary>/// <param name="ToLocalPath">图片本地磁盘地址</param>/// <param name="Url">图片网址</param>/// <returns></returns>public static bool SavePhotoFromUrl(string FileName, string Url){bool Value = false;WebResponse response = null;Stream stream = null;try{HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);response = request.GetResponse();stream = response.GetResponseStream();if (!response.ContentType.ToLower().StartsWith("text/")){Value = SaveBinaryFile(response, FileName);}}catch (Exception err){//Common.PageValidate.WriteFile("下载错误：" + err.Message.ToString());}return Value;}/// <summary>/// Save a binary file to disk./// </summary>/// <param name="response">The response used to save the file</param>// 将二进制文件保存到磁盘private static bool SaveBinaryFile(WebResponse response, string FileName){bool Value = true;byte[] buffer = new byte[1024];try{if (File.Exists(FileName)){File.Delete(FileName);}Stream outStream = System.IO.File.Create(FileName);Stream inStream = response.GetResponseStream();int l;do{l = inStream.Read(buffer, 0, buffer.Length);if (l > 0)outStream.Write(buffer, 0, l);}while (l > 0);outStream.Close();inStream.Close();}catch (Exception ex){Value = false;}return Value;}#endregion#region 抓取网页数据/// <summary>/// 获取网页数据/// </summary>/// <param name="PageURL"></param>/// <returns></returns>public static string GetPageCode(string PageURL){string Charset = "gb2312";try{//存放目标网页的htmlString strHtml = "";//连接到目标网页HttpWebRequest wreq = (HttpWebRequest)WebRequest.Create(PageURL);wreq.Headers.Add("X_FORWARDED_FOR", "101.0.0.11"); //发送X_FORWARDED_FOR头(若是用取源IP的方式，可以用这个来造假IP,对日志的记录无效)wreq.Method = "Get";wreq.KeepAlive = true;wreq.ContentType = "application/x-www-form-urlencoded";wreq.AllowAutoRedirect = true;wreq.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";wreq.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)";CookieContainer cookieCon = new CookieContainer();wreq.CookieContainer = cookieCon;HttpWebResponse wresp = null;try{wresp = (HttpWebResponse)wreq.GetResponse();}catch (WebException ex){wresp = (HttpWebResponse)ex.Response;}//采用流读取，并确定编码方式Stream s = wresp.GetResponseStream();StreamReader objReader = new StreamReader(s, System.Text.Encoding.GetEncoding(Charset));string strLine = "";//读取while (strLine != null){strLine = objReader.ReadLine();if (strLine != null){strHtml += strLine + "\r\n";}}return strHtml;}catch (Exception n) //遇到错误，打印错误{return n.Message;}}#endregion#region 压缩合并cssjs文件/// <summary>/// 压缩合并css文件/// </summary>/// <param name="filePath"></param>/// <param name="cssContent"></param>/// <returns></returns>public static bool CompressCssFile(string filePath, ref string cssContent){bool ret = true;try{//目录不存在string[] pathList = filePath.Split(',');//获取该文件夹下所有js或者css文件HttpContext ctx = HttpContext.Current;string newDir = ctx.Server.MapPath("../style/");string filetype = ".min.css";string newFileName = GetNewFileName(filePath);string newFilePath = newDir + newFileName + filetype;if (File.Exists(newFilePath)){FileInfo Nowinfo = new FileInfo(newFilePath);cssContent = File.ReadAllText(Nowinfo.FullName, Encoding.UTF8);return true;}foreach (string path in pathList){if (ctx.Server.MapPath(path) != ""){FileInfo info = new FileInfo(ctx.Server.MapPath(path));string strContent = File.ReadAllText(info.FullName, Encoding.UTF8);if (info.Extension.ToLower() == ".css"){if (!info.FullName.ToLower().EndsWith(".no.css")){if (!info.FullName.ToLower().EndsWith(".min.css")){strContent = CssCompressor.Compress(strContent);}cssContent += strContent;}}}}var newFile = new FileInfo(newFilePath);File.WriteAllText(newFile.FullName, cssContent, Encoding.UTF8);}catch (Exception ex){ ret = false; }return ret;}/// <summary>/// 压缩合并js文件/// </summary>/// <param name="filePath"></param>/// <param name="jsContent"></param>/// <returns></returns>public static bool CompressJsFile(string filePath, ref string jsContent){bool ret = true;try{//目录不存在string[] pathList = filePath.Split(',');//获取该文件夹下所有js或者css文件HttpContext ctx = HttpContext.Current;string newDir = ctx.Server.MapPath("../scripts/");string filetype = ".min.js";string newFileName = GetNewFileName(filePath);string newFilePath = newDir + newFileName + filetype;if (File.Exists(newFilePath)){FileInfo Nowinfo = new FileInfo(newFilePath);jsContent = File.ReadAllText(Nowinfo.FullName, Encoding.UTF8);return true;}foreach (string path in pathList){if (ctx.Server.MapPath(path) != ""){FileInfo info = new FileInfo(ctx.Server.MapPath(path));string strContent = File.ReadAllText(info.FullName, Encoding.UTF8);if (info.Extension.ToLower() == ".js"){if (!info.FullName.ToLower().EndsWith(".no.js")){if (!info.FullName.ToLower().EndsWith(".min.js")){var js = new JavaScriptCompressor(strContent, false, Encoding.UTF8, System.Globalization.CultureInfo.CurrentCulture);strContent = js.Compress();}jsContent += "\n" + strContent;}}}}var newFile = new FileInfo(newFilePath);File.WriteAllText(newFile.FullName, jsContent, Encoding.UTF8);}catch (Exception ex){ ret = false; }return ret;}/// <summary>/// 获取压缩后新文件的名称/// </summary>/// <param name="filePath"></param>/// <returns></returns>public static string GetNewFileName(string filePath){string[] pathList = filePath.Split(',');//获取该文件夹下所有js或者css文件HttpContext ctx = HttpContext.Current;string newFileName = "";foreach (string path in pathList){if (ctx.Server.MapPath(path) != ""){FileInfo info = new FileInfo(ctx.Server.MapPath(path));newFileName += info.Name.Replace(info.Extension, "") + "_";}}newFileName = newFileName.Remove(newFileName.Length - 1, 1);return newFileName;}#endregion#region 导入导出Excel/// <summary>/// 获取Excel文件数据表列表/// </summary>public static ArrayList GetExcelTables(string ExcelFileName){DataTable dt = new DataTable();ArrayList TablesList = new ArrayList();if (File.Exists(ExcelFileName)){using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=Excel 8.0;Data Source=" + ExcelFileName)){try{conn.Open();dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });}catch (Exception exp){throw exp;}//获取数据表个数int tablecount = dt.Rows.Count;for (int i = 0; i < tablecount; i++){string tablename = dt.Rows[i][2].ToString().Trim().TrimEnd('$');if (TablesList.IndexOf(tablename) < 0){TablesList.Add(tablename);}}}}return TablesList;}#endregion#region 普通文件操作/// <summary>/// 备份文件/// </summary>/// <param name="sourceFileName">源文件名</param>/// <param name="destFileName">目标文件名</param>/// <param name="overwrite">当目标文件存在时是否覆盖</param>/// <returns>操作是否成功</returns>public static bool BackupFile(string sourceFileName, string destFileName, bool overwrite){if (!System.IO.File.Exists(sourceFileName)){throw new FileNotFoundException(sourceFileName + "文件不存在！");}if (!overwrite && System.IO.File.Exists(destFileName)){return false;}try{System.IO.File.Copy(sourceFileName, destFileName, true);return true;}catch (Exception e){throw e;}}#endregion#region 文件上传/// <summary>/// 是否允许该扩展名上传/// </summary>/// <param name="hifile"></param>/// <returns></returns>public static bool IsAllowedExtension(HtmlInputFile hifile){string strOldFilePath = "", strExtension = "";//允许上传的扩展名，可以改成从配置文件中读出string[] arrExtension = { ".gif", ".GIF", ".JPG", ".jpg", ".JPEG", ".BMP", ".PNG", ".jpeg", ".bmp", ".png" };if (hifile.PostedFile.FileName != string.Empty){strOldFilePath = hifile.PostedFile.FileName;//取得上传文件的扩展名strExtension = strOldFilePath.Substring(strOldFilePath.LastIndexOf("."));//判断该扩展名是否合法for (int i = 0; i < arrExtension.Length; i++){if (strExtension.Equals(arrExtension[i])){return true;}}}return false;}/// <summary>/// 判断上传文件大小是否超过最大值/// </summary>/// <param name="hifile"></param>/// <returns></returns>public static bool IsAllowedLength(HtmlInputFile hifile){//允许上传文件大小的最大值,可以保存在xml文件中,单位为KBint i = 512;//如果上传文件的大小超过最大值,返回flase,否则返回true.if (hifile.PostedFile.ContentLength > i * 512){return false;}return true;}/// <summary>/// 上传文件返回新文件名/// </summary>/// <param name="hifile"></param>/// <param name="strAbsolutePath"></param>/// <returns></returns>public static string SaveFile(HtmlInputFile hifile, string strAbsolutePath){string strOldFilePath = "", strExtension = "", strNewFileName = "";if (hifile.PostedFile.FileName != string.Empty){strOldFilePath = hifile.PostedFile.FileName;//取得上传文件的扩展名strExtension = strOldFilePath.Substring(strOldFilePath.LastIndexOf("."));//文件上传后的命名strNewFileName = GetUniqueString() + strExtension;if (strAbsolutePath.LastIndexOf("\\") == strAbsolutePath.Length){hifile.PostedFile.SaveAs(strAbsolutePath + strNewFileName);}else{hifile.PostedFile.SaveAs(strAbsolutePath + "\\" + strNewFileName);}}return strNewFileName;}/// <summary>/// 删除指定文件/// </summary>/// <param name="strAbsolutePath"></param>/// <param name="strFileName"></param>public static void DeleteFile(string strAbsolutePath, string strFileName){if (strAbsolutePath.LastIndexOf("\\") == strAbsolutePath.Length){if (File.Exists(strAbsolutePath + strFileName)){File.Delete(strAbsolutePath + strFileName);}}else{if (File.Exists(strAbsolutePath + "\\" + strFileName)){File.Delete(strAbsolutePath + "\\" + strFileName);}}}/// <summary>/// 删除文件夹下面的文件/// </summary>/// <param name="path"></param>public static void DeleteFilePath(string path){string[] fileList = Directory.GetFiles(path);foreach (string str in fileList){File.Delete(str);}}/// <summary>/// 获取不重复文件名/// </summary>/// <returns></returns>public static string GetUniqueString(){return DateTime.Now.ToString("yyyyMMddhhmmssff");}#endregion/// <summary>/// 将 Stream 转成 byte[]/// </summary>public static byte[] StreamToBytes(Stream stream){byte[] bytes = new byte[stream.Length];stream.Read(bytes, 0, bytes.Length);// 设置当前流的位置为流的开始stream.Seek(0, SeekOrigin.Begin);return bytes;}/// <summary>/// 将 byte[] 转成 Stream/// </summary>public static Stream BytesToStream(byte[] bytes){Stream stream = new MemoryStream(bytes);return stream;}}}