using System;using System.Text;using System.Xml;using System.Data;using System.Collections;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Configuration;using System.IO;
/**/////////////////////////////////////////////////////
///功能：文件操作类//////
////////////////////////////////////////////////////namespace EmanUtils{
/**//// <summary> /// 公用帮助文件处理类
/// </summary> public class FileHelper { /**//// <summary> /// 构造函数 /// </summary> private FileHelper() { }
上传文件上传文件 /**//// <summary> /// 修改 Web.Config 中 appSettings 节点内节点信息 /// </summary> /// <param name="nodeName">节点名</param> /// <param name="nodeKey">节点值</param> /// <returns>返回操作逻辑值</returns> public static bool SetWebConfigValue(string nodeName, string nodeKey) { string filename = System.Web.HttpContext.Current.Server.MapPath(System.Web.HttpContext.Current.Request.ApplicationPath + "/web.config"); XmlDocument xmldoc = new XmlDocument(); xmldoc.Load(filename); System.Xml.XmlNode node = xmldoc.SelectSingleNode("configuration//appSettings"); System.Xml.XmlNodeList nl = node.ChildNodes; foreach(XmlNode el in nl) { try { if(el.Attributes["key"].Value == nodeName) { el.Attributes["value"].Value = nodeKey; } } catch { } } try { xmldoc.Save(filename); return true; } catch { return false; } } /**//// <summary> /// 从完整路径中提取文件名 /// </summary> public static string GetFileName(string path) { return Path.GetFileName(path); } /**//// <summary> /// 新建文件 /// </summary> public static void Create(string path) { try { // 如果以存在文件就删除 if (File.Exists(path)) { File.Delete(path); } //创建文件 using (FileStream fs = File.Create(path)) { } } catch (Exception e) { throw e; } } /**//// <summary> /// 重命名文件 /// </summary> public static bool ReName(string soucePath, string newPath) { try { File.Move(soucePath, newPath); } catch { return false; } return true; } /**//// <summary> /// 移动文件 /// </summary> public static bool Move(string fromPath, string toPath) { return ReName(fromPath, toPath); } /**//// <summary> /// 删除文件 /// </summary> public static bool Delete(string path) { try { File.Delete(path); } catch { return false; } return true; } /**//// <summary> /// 获取文件扩展名 /// </summary> public static string GetFileType(string path) { string type = Path.GetExtension(path); /**//* if (string.IsNullOrEmpty(type)) { return type; } */ return type.Substring(1); } /**//// <summary> /// 返回不具有扩展名的指定路径字符串的文件名 /// </summary> public static string GetFileNameWithoutExtension(string path) { return Path.GetFileNameWithoutExtension(path); } /**//// <summary> /// 判断目标文件夹是否存在 /// </summary> /// <param name="path">文件夹路径 绝对路径 如： e:\zykey</param> /// <returns></returns> public static bool ifdir(string path) { DirectoryInfo d=new DirectoryInfo(path); return d.Exists; } /**//// <summary> /// 返回文件是否存在 /// </summary> /// <param name="filename">文件名</param> /// <returns>是否存在</returns> public static bool FileExists(string filename) { return System.IO.File.Exists(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=" + HttpUtility.UrlEncode(filename.Trim()).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) { // 关闭文件 iStream.Close(); } } HttpContext.Current.Response.End(); } /**//// <summary> /// 判断文件名是否为浏览器可以直接显示的图片文件名 /// </summary> /// <param name="filename">文件名</param> /// <returns>是否可以直接显示</returns> public static bool IsImgFilename(string filename) { filename = filename.Trim(); if (filename.EndsWith(".") || filename.IndexOf(".") == -1) { return false; } string extname = filename.Substring(filename.LastIndexOf(".") + 1).ToLower(); return (extname == "jpg" || extname == "jpeg" || extname == "png" || extname == "bmp" || extname == "gif"); } }}