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html
String 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KB
int 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;
}
}
}
本文出自 “Day Day Up” 博客，谢绝转载！