response输出文件到客户端

1 读取文件并输出到客户端

string fileURL="d://test.xls";
        System.IO.FileInfo fileInfo = new System.IO.FileInfo(fileURL);
        Response.Clear();
        Response.AddHeader("content-disposition", "attachment;filename=" + Server.UrlEncode(fileInfo.Name.ToString()));
        Response.AddHeader("content-length", fileInfo.Length.ToString());
        Response.ContentType = "application/octet-stream";
        Response.Charset = "gb2312";
        Response.ContentEncoding = Encoding.UTF8;
        Response.WriteFile(fileURL);
        Response.Flush();
        Response.End();

2 将流中的数据写入到文件

StringWriter sw = new StringWriter();
             string str = "12t34t56thah";
             sw.WriteLine(str);
             输出到Excel
             Response.Clear();
             Response.AddHeader("Content-disposition", "attachment;filename="+filename+".xls");
             //Response.ContentEncoding = Encoding.GetEncoding("gb2312");
             Response.ContentEncoding = Encoding.UTF8;
             Response.ContentType = "application/ms-excel";
             Response.Charset = "gb2312";
             Response.Write(sw.ToString());
             sw.Close();
             Response.Flush();
             Response.End();