那个下载是怎么实现的?

Question

就是我进入一个页面后，看到一个链接，上面的后缀名是.DOC格式的，我点击后就可以直接下载了，这是怎么做的，谁会，教下

Answer 1

哦
var href = "<%= Url.Content("~/....../printFile?....;
window.open(href,"_blank",null);

Answer 2

public class DownloadHandler : IHttpHandler
    {
        /// <summary>
        ///功能说明：文件下载类--不管是什么格式的文件,都能够弹出打开/保存窗口,
        ///包括使用下载工具下载
        ///继承于IHttpHandler接口，可以用来自定义HTTP 处理程序同步处理HTTP的请求
        /// </summary>
        /// <param name="context"></param>
        public void ProcessRequest(HttpContext context)
        {
            HttpResponse Response = context.Response;
            HttpRequest Request = context.Request;            System.IO.Stream iStream = null;            byte[] buffer = new Byte[10240];            int length;            long dataToRead;            try
            {
                string filename = FileHelper.Decrypt(Request["fn"]); //通过解密得到文件名                string filepath = HttpContext.Current.Server.MapPath("~/") + filename; //待下载的文件路径                iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,
                    System.IO.FileAccess.Read, System.IO.FileShare.Read);
                Response.Clear();                dataToRead = iStream.Length;                long p = 0;
                if (Request.Headers["Range"] != null)
                {
                    Response.StatusCode = 206;
                    p = long.Parse(Request.Headers["Range"].Replace("bytes=", "").Replace("-", ""));
                }
                if (p != 0)
                {
                    Response.AddHeader("Content-Range", "bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString());
                }
                Response.AddHeader("Content-Length", ((long)(dataToRead - p)).ToString());
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(System.Text.Encoding.GetEncoding(65001).GetBytes(Path.GetFileName(filename))));                iStream.Position = p;
                dataToRead = dataToRead - p;                while (dataToRead > 0)
                {
                    if (Response.IsClientConnected)
                    {
                        length = iStream.Read(buffer, 0, 10240);                        Response.OutputStream.Write(buffer, 0, length);
                        Response.Flush();                        buffer = new Byte[10240];
                        dataToRead = dataToRead - length;
                    }
                    else
                    {
                        dataToRead = -1;
                    }
                }
            }
            catch (Exception ex)
            {
                Response.Write("Error : " + ex.Message);
            }
            finally
            {
                if (iStream != null)
                {
                    iStream.Close();
                }
                Response.End();
            }
        }        public bool IsReusable
        {
            get { return true; }
        }
    }    /// <summary>
    /// 这里涉及到一个文件名加解密的问题，是为了防止文件具体名称暴露在状态栏中，所以添加一个FileHelper类
    /// </summary>
    public class FileHelper
    {
        /// <summary>
        /// 利用Base64码对文件名进行加密处理。
        /// </summary>
        /// <param name="filename">文件名</param>
        /// <returns></returns>
        public static string Encrypt(string filename)
        {
            byte[] buffer = HttpContext.Current.Request.ContentEncoding.GetBytes(filename);
            return HttpUtility.UrlEncode(Convert.ToBase64String(buffer));
        }        /// <summary>
        /// 利用Base64码对文件名进行解密处理。
        /// </summary>
        /// <param name="encryptfilename">文件名</param>
        /// <returns></returns>
        public static string Decrypt(string encryptfilename)
        {
            byte[] buffer = Convert.FromBase64String(encryptfilename);
            return HttpContext.Current.Request.ContentEncoding.GetString(buffer);
        }
    }string url = FileHelper.Encrypt(outFile);//对下载文件名进行加密
Response.Redirect("~/download.aspx?fn=" + url);//解密下载

Answer 3

这是后台下载方法printFile里面的代码，其他自己写：
//取得下载服务器路径，并设定下载格式。
string url = ConfigurationManager.AppSettings["xxx"] + "InMsgList&rs:Command=Render&rs:Format=PDF";
//生成下载数据
byte[] data = ReportingUtil.PrintURL(url + res);
//打开下载窗口
return new FileContentResult(data, "application/pdf");

Answer 4

那是他写成那样的而已，那个连接地址直接指向你的DOC即可！不用写多余的代码