[ASP.NET]web实现用FTP上传、下载文件(附源码)

文章配套源码下载地址：https://download.csdn.net/download/djk8888/10486581

index.aspx 页：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="index" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server"><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>ASP.NET的FTP上传和下载</title><script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body><form id="form1" runat="server"><div><asp:FileUpload runat="server" ID="FileUpload"></asp:FileUpload>  <asp:Button ID="Button1" runat="server" Text="FTP上传" OnClick="Button1_Click" />  <asp:Button ID="Button2" runat="server" Text="刷新列表" OnClick="Button2_Click" /><br /><br /><table border="1" width="1000"><tr><th>编号</th><th>文件夹</th><th>文件名</th><th>日期</th><th>http协议下载</th><th>ftp协议下载</th></tr><asp:Repeater runat="server" ID="Repeater1"><ItemTemplate><tr><td><%#Eval("fileNo") %></td><td><%#Eval("ftpURI") %></td><td><%#Eval("fileName") %></td><td><%#Eval("datetime") %></td><td><a target="_blank" href='http://djk8888csdn.3vcm.net/<%#Eval("ftpURI") %>/<%#Eval("fileName") %>'>http://djk8888csdn.3vcm.net/<%#Eval("ftpURI") %>/<%#Eval("fileName") %></a></td>                            <td><input type="button" value="下载" onclick=ftpDownload('<%#Eval("ftpURI") %>','<%#Eval("fileName") %>') /></td></tr></ItemTemplate></asp:Repeater></table></div></form>
</body>
</html>
<script type="text/javascript">function ftpDownload(uri, name) {$.get("ftpDownload.ashx",{ ftpURI: uri, fileName: name },function (e) {if (e == "ok") {alert("下载成功！文件在：\r\n C:\\" + name);}else {alert("下载失败:\r\n" + e);}});}
</script>

index.aspx.cs 页：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;/// <summary>
/// 这是一个完整的例子
/// </summary>
public partial class index : System.Web.UI.Page
{static string strfile = "info.txt";//txt文件名string txtPath = HttpContext.Current.Server.MapPath(strfile);//相对路径转绝对路径string strout = string.Empty;//txt文件里读出来的内容      protected void Page_Load(object sender, EventArgs e){if (!IsPostBack){Bind();}}//刷新列表protected void Button2_Click(object sender, EventArgs e){Bind();}private void Bind(){//string txt = File.ReadAllText(txtPath, Encoding.Default);//如果txt内容较少可用此法                 if (File.Exists(txtPath)){using (StreamReader sr = new StreamReader(System.Web.HttpContext.Current.Server.MapPath(strfile), System.Text.Encoding.Default)){strout = sr.ReadToEnd();string temp = strout.Replace("\r\n", "");string[] strArr = temp.Split(';');//分解每一组数据                            if (strArr != null && strArr.Any()){int fileNo = 1;List<Info> list = new List<Info>();foreach (var item in strArr){if (!string.IsNullOrEmpty(item) && !string.IsNullOrWhiteSpace(item)){string[] strArr2 = item.Split('|');//分解每一个属性Info info = new Info();info.fileNo = fileNo; fileNo++;info.ftpURI = strArr2[0].ToString();info.fileName = strArr2[1].ToString();info.datetime = DateTime.Parse(strArr2[2].ToString());list.Add(info);}}if (list != null && list.Any()){this.Repeater1.DataSource = list.OrderByDescending(a => a.datetime);this.Repeater1.DataBind();}}}}}protected void Button1_Click(object sender, EventArgs e){string errorMsg = "";if (FileUpload.HasFile){int fileLength = FileUpload.PostedFile.ContentLength;//文件大小，单位bytestring fileName = Path.GetFileName(FileUpload.PostedFile.FileName);//文件名称string extension = Path.GetExtension(FileUpload.PostedFile.FileName).ToLower();//文件扩展名//限制上传文件最大不能超过500M  if (!(fileLength < 512 * 1024 * 1024)){Response.Write("<script>alert('文件最大不能超过500M！');</script>");return;}//限制文件格式if (!".doc.docx.xls.xlsx.pdf.txt.jpg.jpeg".Contains(extension)){Response.Write("<script>alert('不支持的文件格式！');</script>");return;}//创建文件夹string ftpURI = DateTime.Now.ToString("yyyyMMdd");//以日期作为文件夹名称try{FtpWeb.CreateDirectory(ftpURI);//创建文件夹}catch { }//准备上传文件Stream fileStream = null;try{fileStream = FileUpload.PostedFile.InputStream;//读取本地文件流var b = FtpWeb.Upload(ftpURI, fileName, fileLength, fileStream, out errorMsg);//开始上传if (b){if (File.Exists(txtPath)){FileStream myStream = new FileStream(txtPath, FileMode.Append, FileAccess.Write);// FileMode.Append,追加一行数据StreamWriter sw = new StreamWriter(myStream);sw.WriteLine(ftpURI + "|" + fileName + "|" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ";");//写入文件sw.Close();}Bind();Response.Write("<script>alert('上传成功！');</script>");}else{Response.Write("<script>alert('上传失败！" + errorMsg + "');</script>");}}catch (Exception ex){Response.Write("<script>alert('上传失败！" + ex.ToString() + "');</script>");}finally{if (fileStream != null) fileStream.Close();}}else{Response.Write("<script>alert('请选择一个文件再上传！');</script>");}}public class Info{public int fileNo { get; set; }public string ftpURI { get; set; }public string fileName { get; set; }public DateTime datetime { get; set; }}
}

ftpDownload.ashx 页：

<%@ WebHandler Language="C#" Class="ftpDownload" %>using System;
using System.Web;public class ftpDownload : IHttpHandler
{/// <summary>/// ftp协议下载文件/// </summary>/// <param name="context"></param>public void ProcessRequest(HttpContext context){context.Response.ContentType = "text/plain";string ftpURI = context.Request.QueryString["ftpURI"];//ftpURIstring fileName = context.Request.QueryString["fileName"];//fileNamestring localPath = "C:\\";//文件下载路径(可自定义)string errorMsg = "";bool b = FtpWeb.Download(ftpURI, localPath, fileName, out errorMsg);if (b){context.Response.Write("ok");}else{context.Response.Write(errorMsg);}}public bool IsReusable{get{return false;}}
}

FtpWeb.cs 页：

using System;
using System.IO;
using System.Net;/// <summary>
/// web地址：   http://djk8888csdn.3vcm.net/
/// FTP地址：   ftp://013.3vftp.com/
/// FTP账号：   djk8888csdn
/// FTP密码：   123456
/// </summary>
public class FtpWeb
{public static string ftpHost = "ftp://013.3vftp.com/";//FTP的ip地址或域名 public static string ftpUserID = "djk8888csdn";//ftp账号public static string ftpPassword = "123456";//ftp密码/// <summary>/// 上传/// </summary>/// <param name="ftpURI">ftp上的路径</param>/// <param name="filename">ftp上的文件名</param>/// <param name="fileLength">文件大小</param>/// <param name="localStream">本地文件流</param>/// <param name="errorMsg">报错信息</param>/// <returns></returns>public static bool Upload(string ftpURI, string filename, int fileLength, Stream localStream, out string errorMsg){errorMsg = "";Stream fileStream = null;//本地文件流Stream requestStream = null;//ftp文件流      try{fileStream = localStream;//本地文件流Uri uri = new Uri(ftpHost + ftpURI + "/" + filename);//ftp完整路径FtpWebRequest uploadRequest = (FtpWebRequest)WebRequest.Create(uri);//创建FtpWebRequest实例uploadRequest  uploadRequest.Method = WebRequestMethods.Ftp.UploadFile;//将FtpWebRequest属性设置为上传文件  uploadRequest.Credentials = new NetworkCredential(ftpUserID, ftpPassword);//认证FTP用户名密码  requestStream = uploadRequest.GetRequestStream();//ftp上的空文件int buffLength = 2048; //开辟2KB缓存区  byte[] buff = new byte[buffLength];int contentLen;contentLen = fileStream.Read(buff, 0, buffLength);while (contentLen != 0){requestStream.Write(buff, 0, contentLen);//将本地文件流写入到ftp上的空文件中去contentLen = fileStream.Read(buff, 0, buffLength);}requestStream.Close();fileStream.Close();return true;}catch (Exception ex){errorMsg = ex.Message;return false;}finally{if (fileStream != null) fileStream.Close();if (requestStream != null) requestStream.Close();}}//创建文件夹public static string CreateDirectory(string ftpDir){FtpWebRequest request = SetFtpConfig(WebRequestMethods.Ftp.MakeDirectory, ftpDir);FtpWebResponse response = (FtpWebResponse)request.GetResponse();return response.StatusDescription;}private static FtpWebRequest SetFtpConfig(string method, string ftpDir){return SetFtpConfig(method, ftpDir, "");}private static FtpWebRequest SetFtpConfig(string method, string ftpDir, string fileName){ftpDir = string.IsNullOrEmpty(ftpDir) ? "" : ftpDir.Trim();return SetFtpConfig(ftpHost, ftpUserID, ftpPassword, method, ftpDir, fileName);}private static FtpWebRequest SetFtpConfig(string host, string username, string password, string method, string RemoteDir, string RemoteFileName){System.Net.ServicePointManager.DefaultConnectionLimit = 50;FtpWebRequest request = (FtpWebRequest)WebRequest.Create(host + RemoteDir + "/" + RemoteFileName);request.Method = method;request.Credentials = new NetworkCredential(username, password);request.UsePassive = false;request.UseBinary = true;request.KeepAlive = false;return request;}/// <summary>/// FTP文件下载(代码仅供参考)/// </summary>/// <param name="ftpURI">fpt文件路径</param>/// <param name="localPath">本地文件路径</param>/// <param name="fileName">ftp文件名</param>/// <param name="errorMsg">报错信息</param>/// <returns></returns>public static bool Download(string ftpURI, string localPath, string fileName, out string errorMsg){errorMsg = "";FtpWebRequest reqFTP = null;FileStream outputStream = null;Stream ftpStream = null;FtpWebResponse response = null;try{outputStream = new FileStream(localPath + "/" + fileName, FileMode.Create);//创建本地空文件Uri uri = new Uri(ftpHost + ftpURI + "/" + fileName);//ftp完整路径reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;reqFTP.UseBinary = true;reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);//登录ftpresponse = (FtpWebResponse)reqFTP.GetResponse();ftpStream = response.GetResponseStream();//读取ftp上文件流long cl = response.ContentLength;int bufferSize = 2048;//缓冲int readCount;byte[] buffer = new byte[bufferSize];readCount = ftpStream.Read(buffer, 0, bufferSize);while (readCount > 0){outputStream.Write(buffer, 0, readCount);//将ftp文件流写入到本地空文件中去readCount = ftpStream.Read(buffer, 0, bufferSize);}return true;}catch (Exception ex){errorMsg = ex.Message;return false;}finally{if (ftpStream != null) ftpStream.Close();if (outputStream != null) outputStream.Close();if (response != null) response.Close();}}
}

文章配套源码下载地址：https://download.csdn.net/download/djk8888/10486581

winform的ftp上传下载：https://blog.csdn.net/djk8888/article/details/80662238

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