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  • mvc 文件下载

    public class DownLoadHelper
        {
           
            /// <summary>
            /// WriteFile实现下载--测试通过
            /// </summary>
            /// <param name="filePath">文件路径</param>
            public static void  DownLoadWithWriteFile(string filePath)
            {
                string fileName = Path.GetFileName(filePath);//客户端保存的文件名
                FileInfo fileInfo = new FileInfo(filePath);
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.ClearContent();
                HttpContext.Current.Response.ClearHeaders();
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
                HttpContext.Current.Response.AddHeader("Content-Length", fileInfo.Length.ToString());
                HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "binary");
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
                HttpContext.Current.Response.WriteFile(fileInfo.FullName);
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.End();
            }
            /// <summary>
            /// WriteFile分块下载--测试通过
            /// </summary>
            /// <param name="filePath">文件路径</param>
            public static void DownLoadWithWriteFileByStep(string filePath)
            {
                string fileName = Path.GetFileName(filePath);//客户端保存的文件名
                System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
                if (fileInfo.Exists)
                {
                    const long ChunkSize = 102400;//100K 每次读取文件,只读取100K,这样可以缓解服务器的压力
                    byte[] buffer = new byte[ChunkSize];
                    HttpContext.Current.Response.Clear();
                    System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
                    long dataLengthToRead = iStream.Length;//获取下载的文件总大小
                    HttpContext.Current.Response.ContentType = "application/octet-stream";
                    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
                    while (dataLengthToRead > 0 && HttpContext.Current.Response.IsClientConnected)
                    {
                        int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
                        HttpContext.Current.Response.OutputStream.Write(buffer, 0, lengthRead);
                        HttpContext.Current.Response.Flush();
                        dataLengthToRead = dataLengthToRead - lengthRead;
                    }
                    HttpContext.Current.Response.Close();
                }
            }
            /// <summary>
            /// 流方式下载--测试通过
            /// </summary>
            /// <param name="filePath">文件路径</param>
            public static void DownLoadWithStream(string filePath)
            {
                string fileName = Path.GetFileName(filePath);//客户端保存的文件名
                //以字符流的形式下载文件
                FileStream fs = new FileStream(filePath, FileMode.Open);
                byte[] bytes = new byte[(int)fs.Length];
                fs.Read(bytes, 0, bytes.Length);
                fs.Close();
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                //通知浏览器下载文件而不是打开
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;  filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
                HttpContext.Current.Response.BinaryWrite(bytes);
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.End();
            }
            /// <summary>
            /// TransmitFile实现下载--测试通过
            /// </summary>
            /// <param name="filePath">文件路径</param>
            public static void DownLoadWithTransmitFile(string filePath)
            {
                string fileName = Path.GetFileName(filePath);//客户端保存的文件名
                /*
             微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
             下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
             */
                HttpContext.Current.Response.ContentType = "application/x-zip-compressed";
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename="+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
                HttpContext.Current.Response.TransmitFile(filePath);
            }
        }
    调用方法:
    public void DownMap(string LinkUrl)
    {
    string filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "DownLoadSource\1.txt");
    DownLoadHelper.DownLoadWithTransmitFile(filePath);
    }
    前端:
    function download(linkUrl) {
                window.location.href = "/Home/DownMap?LinkUrl=" + linkUrl;
            }
    

      

      

     
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  • 原文地址:https://www.cnblogs.com/huangzhen22/p/4037970.html
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