asp.net使用一般处理程序实现文件下载

2021-06-26 21:03

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标签：href [] 方案方式 map txt ade pos content

首先有一个html页面，页面有一个链接，点击链接弹出文件下载/保存(类似迅雷下载链接)

DOCTYPE html>
html>
head>
meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    title>文件下载title>
    meta charset="utf-8" />
head>
body>
    
    a href="App_Data/readme.txt">下载readme.txt文件a>
    br />
    a href="DownloadFileHandler.ashx">下载readme.txt文件a>
body>
html>

View Code

一般处理程序的代码如下

using System.IO;
using System.Web;

namespace Zhong.Web
{
    /// 
    /// DownloadFileHandler 的摘要说明
    /// 
    public class DownloadFileHandler : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            string filePath = context.Server.MapPath("~/App_Data/readme.txt");
            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Dispose();

            context.Response.ContentType = "application/octet-stream";
            context.Response.AddHeader("Content-Disposition", "attachment; filename=readme.txt");
            context.Response.BinaryWrite(bytes);
            context.Response.Flush();

            //大文件下载的解决方案
            //context.Response.ContentType = "application/x-zip-compressed";
            //context.Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
            //string filename = Server.MapPath("~/App_Data/move.zip");
            //context.Response.TransmitFile(filename);
        }

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