asp.net 文件下载 文件名称乱码 处理~~

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.IO;

using ElementLibrary.BLL; using ElementLibrary.MODEL; using System.Text; /* * LiuH * Descr:下载处理DownLoadFile.ashx * Addtime：2014/8/26 * LastModifyTime:2014/8/27 */ namespace ElementLibrary.Web.Action { /// <summary> ///DownLoadFile 的摘要描述 /// </summary> public class DownLoadFile : IHttpHandler { ElementDetailBLL elementDetailBLL = new ElementDetailBLL(); public void ProcessRequest(HttpContext context) { string strFunId = context.Request.QueryString["id"].ToString();//获取方法id(元件ID) MODEL.ElementDetailInfo elementDetailInfo = elementDetailBLL.GetAllContent(strFunId);//客户端保存的文件名 string fileName = elementDetailInfo.FileName; string strFilePath = elementDetailInfo.FilePath; string filePath = context.Server.MapPath(strFilePath);//路径 FileInfo fileInfo = new FileInfo(filePath); context.Response.Clear(); context.Response.ClearContent(); context.Response.ClearHeaders(); //解决文件名乱码（LiuH AddTime:2014/8/28） if (context.Request.UserAgent.Contains("MSIE") || context.Request.UserAgent.Contains("msie")) { // 如果客户端使用 Microsoft Internet Explorer，则需要编码 fileName = ToHexString(fileName); } context.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName); context.Response.AddHeader("Content-Length", fileInfo.Length.ToString()); context.Response.AddHeader("Content-Transfer-Encoding", "binary"); context.Response.ContentType = "application/octet-stream"; context.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8"); context.Response.WriteFile(fileInfo.FullName); context.Response.Flush(); //fileInfo.Delete(); context.Response.End(); }

/// <summary> /// 为字符串中的非英文字符编码 /// </summary> /// <param name="s"></param> /// <returns></returns> public static string ToHexString(string s) { char[] chars = s.ToCharArray(); StringBuilder builder = new StringBuilder(); for (int index = 0; index < chars.Length; index++) { bool needToEncode = NeedToEncode(chars[index]); if (needToEncode) { string encodedString = ToHexString(chars[index]); builder.Append(encodedString); } else { builder.Append(chars[index]); } }

return builder.ToString(); }

/// <summary> ///指定 一个字符是否应该被编码 /// </summary> /// <param name="chr"></param> /// <returns></returns> private static bool NeedToEncode(char chr) { string reservedChars = "$-_.+!*'(),@=&";

if (chr > 127) return true; if (char.IsLetterOrDigit(chr) || reservedChars.IndexOf(chr) >= 0) return false;

return true; }

/// <summary> /// 为非英文字符串编码 /// </summary> /// <param name="chr"></param> /// <returns></returns> private static string ToHexString(char chr) { UTF8Encoding utf8 = new UTF8Encoding(); byte[] encodedBytes = utf8.GetBytes(chr.ToString()); StringBuilder builder = new StringBuilder(); for (int index = 0; index < encodedBytes.Length; index++) { builder.AppendFormat("%{0}", Convert.ToString(encodedBytes[index], 16)); } return builder.ToString(); }

public bool IsReusable { get { return false; } } } }