先列出代码,过段时间再写说明
protected void Page_Load(object sender, EventArgs e) { string file = Request["file"]; if (string.IsNullOrEmpty(file)) return; string filepath = Server.MapPath("~/Download/" + file); if (File.Exists(filepath)) //DownLoadStreamFile(filepath); ToOpen(filepath, ""); Response.End(); } /// <summary> /// 下载文件 /// </summary> /// <param name="serverfilpath"></param> /// <param name="filename"></param> public static void ToDownload(string serverfilpath, string filename) { FileStream fileStream = new FileStream(serverfilpath, FileMode.Open); long fileSize = fileStream.Length; HttpContext.Current.Response.ContentType = "application/octet-stream"; HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=\"" + UTF_FileName(filename) + "\";"); ////attachment --- 作为附件下载 ////inline --- 在线打开 HttpContext.Current.Response.AddHeader("Content-Length", fileSize.ToString()); byte[] fileBuffer = new byte[fileSize]; fileStream.Read(fileBuffer, 0, (int)fileSize); HttpContext.Current.Response.BinaryWrite(fileBuffer); fileStream.Close(); HttpContext.Current.Response.End(); } /// <summary> /// 打开文件 /// </summary> /// <param name="serverfilpath"></param> /// <param name="filename"></param> public static void ToOpen(string serverfilpath, string filename) { FileStream fileStream = new FileStream(serverfilpath, FileMode.Open); long fileSize = fileStream.Length; HttpContext.Current.Response.ContentType = "application/octet-stream"; HttpContext.Current.Response.AddHeader("Content-Disposition", "inline; filename=\"" + UTF_FileName(filename) + "\";"); HttpContext.Current.Response.AddHeader("Content-Length", fileSize.ToString()); byte[] fileBuffer = new byte[fileSize]; fileStream.Read(fileBuffer, 0, (int)fileSize); HttpContext.Current.Response.BinaryWrite(fileBuffer); fileStream.Close(); HttpContext.Current.Response.End(); } private static string UTF_FileName(string filename) { return HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8); } /// <summary> /// 下载文件数据流 /// </summary> /// <param name="serverfilpath"></param> public static void DownLoadStreamFile(string serverfilpath) { int blocksize = 1024 * 100; byte[] buffer = new byte[blocksize]; byte[] fileHeader = new byte[101]; int startindex = 0; int bytesread = 0; int bytesfinish = 0; int filesize = 0; string headerText = string.Empty; BinaryReader bReader = null; bReader = new BinaryReader(File.OpenRead(serverfilpath)); filesize = Convert.ToInt32(bReader.BaseStream.Length); while (bytesfinish < filesize) { if (bytesfinish + blocksize < filesize) bytesread = bReader.Read(buffer, startindex, blocksize); else bytesread = bReader.Read(buffer, startindex, filesize - bytesfinish); bytesfinish += bytesread; HttpContext.Current.Response.OutputStream.Write(buffer, 0, bytesread); } bReader.Close(); HttpContext.Current.Response.End(); }
我这里是maven项目,只需在资源文件中配置,会自动下载ar包在pox.xml中配置<!--word转htmlhttps://mvnrepository.com/artifact/org.apache.poi/poi-scratchp…
Java使用压缩库为常规压缩提供了Deflater类。它还提供了DeflaterOutputStream,它使用Deflater类通过压缩(压缩)数据流,然后将压缩后的数据写入另一个输出流来过滤数据流。有等效的Inflater和Inflat…
2017-03-07在开发中,自己遇到一个前端在上传图片的时候,使用的base64数据流文件显示的图片。也就是说<imgsrc="data:image/jpg;base64,"/>***image/后面的jpg是我们的图片文件格…
首先安装:pipinstallpywin32importwin32com.clientaswin32fname="C:\\标准化文档-20171226\\全量数据过滤表清单.xls"excel=win32.gencache.EnsureDi…
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privateclassMultipartFileResourceextendsInputStreamResource{privateStringfileName;privateInputStreaminputStream;publicMu…
问题描述今天在做一个客户需求的二次开发,出现了一个java数组越界但是并没有抛异常,也没有写日志的情况。在公司的系统中,用户提交的表单可能包含有多个明细表。用户提交表单以后可以通过多个Action进行后续的数据校验,数据同步到异构系统等,可…
ZLib是DEFLATE算法的实现库,它的API同时支持gzip文件格式以及一个简化的数据流格式。zlib数据流格式、DEFLATE以及gzip文件格式均已被分别标准化为RFC1950、RFC1951、RFC1952。gzip在HTTP压缩…