asp.net中操作ftp的方法

有的時候我們上傳東西不想傳到web目錄而是ftp服務器，這樣可以不佔用服務器寶貴空間，以前發過一個tips中提到利用ftpsupport.dll操作ftp的方法，可能當時沒有說清楚，網友要求給個清楚的例子，就隨便寫了個文件可以上傳，下載，刪除ftp上的文件：

首先，dll 點擊這裏下載，別忘記給項目添加引用

test.aspx:

<%@ Page language="c#" Codebehind="Test.aspx.cs" AutoEventWireup="false" Inherits="FtpTest.Test" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>Test</title>
        <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
        <meta name="CODE_LANGUAGE" Content="C#">
        <meta name="vs_defaultClientScript" content="JavaScript">
        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
    </HEAD>
    <body>
        <form id="Form1" method="post" runat="server">
            <input type="file" id="file1" runat="server">
            <asp:TextBox id="tb_Dir" runat="server" Width="80px">\</asp:TextBox>
            <asp:Button id="btn_upload" runat="server" Text="Upload"></asp:Button>
            <asp:DataGrid id="DataGrid1" runat="server" AutoGenerateColumns="False" CellPadding="3" DataKeyField="AutoID">
                <ItemStyle Font-Size="9pt" Font-Names="Verdana"></ItemStyle>
                <HeaderStyle Font-Size="9pt" Font-Names="Verdana" Font-Bold="True"></HeaderStyle>
                <Columns>
                    <asp:BoundColumn DataField="FileName" HeaderText="FileName"></asp:BoundColumn>
                    <asp:BoundColumn DataField="FilePath" HeaderText="FilePath"></asp:BoundColumn>
                    <asp:BoundColumn DataField="FileDownloadName" HeaderText="FileDownloadName"></asp:BoundColumn>
                    <asp:BoundColumn DataField="FileSize" HeaderText="FileSize(K)"></asp:BoundColumn>
                    <asp:BoundColumn DataField="UploadTime" HeaderText="UploadTime"></asp:BoundColumn>
                    <asp:ButtonColumn Text="DOWNLOAD" HeaderText="Download" CommandName="Download"></asp:ButtonColumn>
                    <asp:ButtonColumn Text="DEL" HeaderText="Del" CommandName="Del"></asp:ButtonColumn>
                </Columns>
            </asp:DataGrid>
        </form>
    </body>
</HTML>

test.aspx.cs:

using System;
using System.Collections;
using System.Configuration;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace FtpTest
{
    /// <summary>
    /// Test 的摘要說明。
    /// </summary>
    public class Test : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Button btn_upload;
        protected System.Web.UI.HtmlControls.HtmlInputFile file1;
        protected System.Web.UI.WebControls.TextBox tb_Dir;
        protected System.Web.UI.WebControls.DataGrid DataGrid1;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            if(!IsPostBack)
            {
                SetBind();
            }
        }

        #region Web 窗體設計器生成的代碼
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 該調用是 ASP.NET Web 窗體設計器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /// <summary>
        /// 設計器支持所需的方法 - 不要使用代碼編輯器修改
        /// 此方法的內容。
        /// </summary>
        private void InitializeComponent()
        {    
            this.btn_upload.Click += new System.EventHandler(this.btn_upload_Click);
            this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void SetBind()
        {
            SqlConnection conn=new SqlConnection(ConfigurationSettings.AppSettings["strconn"]);
            SqlDataAdapter da=new SqlDataAdapter("select * from FTP order by FilePath",conn);
            DataSet ds=new DataSet();
            da.Fill(ds);
            this.DataGrid1.DataSource=ds;
            this.DataGrid1.DataBind();
        }

        private void btn_upload_Click(object sender, System.EventArgs e)
        {
            FtpClass ftp=new FtpClass();
            string filedownloadname=ftp.FtpUpload(this.file1.PostedFile,this.tb_Dir.Text);
            string [] arrs=file1.PostedFile.FileName.Split('\\');
            string filename=arrs[arrs.Length-1];
            SqlConnection conn=new SqlConnection(ConfigurationSettings.AppSettings["strconn"]); 
            SqlCommand comm=new SqlCommand("insert into FTP (FileName,FileDownloadName,FilePath,FileSize,UploadTime) values (@filename,@filedownloadname,@filepath,@filesize,@uploadtime)",conn); 
            SqlParameter parm1=new SqlParameter("@filename",SqlDbType.NVarChar,50); 
            parm1.Value=filename;
            SqlParameter parm2=new SqlParameter("@filedownloadname",SqlDbType.NVarChar,50); 
            parm2.Value=filedownloadname;
            SqlParameter parm3=new SqlParameter("@filepath",SqlDbType.NVarChar,50); 
            parm3.Value=this.tb_Dir.Text;
            SqlParameter parm4=new SqlParameter("@filesize",SqlDbType.Int); 
            parm4.Value=this.file1.PostedFile.ContentLength/1024;
            SqlParameter parm5=new SqlParameter("@uploadtime",SqlDbType.DateTime); 
            parm5.Value=DateTime.Now.ToString();
            comm.Parameters.Add(parm1); 
            comm.Parameters.Add(parm2); 
            comm.Parameters.Add(parm3); 
            comm.Parameters.Add(parm4);
            comm.Parameters.Add(parm5); 
            conn.Open(); 
            comm.ExecuteNonQuery(); 
            conn.Close(); 
            SetBind();
        }

        private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
        {
            if(e.CommandName=="Del")
            {
                FtpClass ftp=new FtpClass();
                ftp.FileDel(e.Item.Cells[2].Text,e.Item.Cells[1].Text);
                SqlConnection conn=new SqlConnection(ConfigurationSettings.AppSettings["strconn"]); 
                SqlCommand comm=new SqlCommand("delete from FTP where AutoID=@autoid",conn); 
                SqlParameter parm1=new SqlParameter("@autoid",SqlDbType.NVarChar,50); 
                parm1.Value=this.DataGrid1.DataKeys[e.Item.ItemIndex];
                comm.Parameters.Add(parm1); 
                conn.Open(); 
                comm.ExecuteNonQuery(); 
                conn.Close();                 
                SetBind();
            }

            if(e.CommandName=="Download")
            {
                FtpClass ftp=new FtpClass();
                ftp.FtpDownload(HttpContext.Current,e.Item.Cells[2].Text,e.Item.Cells[1].Text);
            }
        }
    }
}

FtpClass.cs:

using System;
using System.Configuration;
using System.IO;
using FtpSupport;
using Microsoft.Win32;
using System.Web;

namespace FtpTest
{
    public class FtpClass
    {
        private string FtpIP=ConfigurationSettings.AppSettings["FtpIP"];
        private string FtpUserName=ConfigurationSettings.AppSettings["FtpUserName"];
        private string FtpPassord=ConfigurationSettings.AppSettings["FtpPassWord"];
        private FtpConnection ftp;

        private FtpConnection FtpConn()
        {
            ftp=new FtpConnection();
            ftp.Connect(this.FtpIP,this.FtpUserName,this.FtpPassord);
            return ftp;
        }

        private string GetFileExtName(string filename,bool withdot)
        {
            string [] arrs=filename.Split('.');
            int i=arrs.Length;
            return withdot?"."+arrs[i-1].ToString():arrs[i-1].ToString();
        }

        private string GetFileContentType(string filedownloadname)
        {
            string DEFAULT_CONTENT_TYPE = "application/unknown";
            RegistryKey regkey,fileextkey;
            string FileContentType;
            try 
            {                
                regkey=Registry.ClassesRoot;                
                fileextkey=regkey.OpenSubKey(this.GetFileExtName(filedownloadname,false));                
                FileContentType=fileextkey.GetValue("Content Type",DEFAULT_CONTENT_TYPE).ToString();
            }
            catch
            {
                FileContentType=DEFAULT_CONTENT_TYPE;
            }        
            return FileContentType;
        }

        public string FtpUpload(HttpPostedFile file,string dir)
        {
            string FileDownloadName=DateTime.Now.ToString("yyyyMMddhhmmss")+this.GetFileExtName(file.FileName,true);
            FtpConnection ftp=this.FtpConn();
            if(ftp.DirectoryExist(dir))
                ftp.SetCurrentDirectory(dir);
            else
            {
                ftp.CreateDirectory(dir);
                ftp.SetCurrentDirectory(dir);
            }
            ftp.PutStream(file.InputStream,FileDownloadName);
            ftp.Close();
            return FileDownloadName;
        }

        public void FileDel(string filedownloadname,string dir)
        {
            FtpConnection ftp=this.FtpConn();
            if(ftp.DirectoryExist(dir))
            {
                ftp.SetCurrentDirectory(dir);
                if(ftp.FileExist(filedownloadname))
                {
                    ftp.DeleteFile(filedownloadname);
                }
            }
            ftp.Close();
        }

        public void FtpDownload(HttpContext context,string filedownloadname,string dir)
        {
            context.Response.Clear();
            context.Response.AddHeader("Content-Disposition", "attachment; filename="+filedownloadname); 
            context.Response.ContentType=this.GetFileContentType(filedownloadname);
            FtpConnection ftp=this.FtpConn();
            ftp.SetCurrentDirectory(dir);
            if(ftp.FileExist(filedownloadname))
            {
                FtpStream ftpfs=ftp.OpenFile(filedownloadname,GenericRights.Read);
                byte [] buffer=new byte[10240];
                int n=ftpfs.Read(buffer,0,buffer.Length);
                while(n>0)
                {
                    context.Response.BinaryWrite(buffer);
                    n=ftpfs.Read(buffer,0,buffer.Length);
                }
                Response.End();
                ftpfs.Close();
            }
            else
            {
                context.Response.Write("<script>alert('file does not exist!');</script>");
            }
            ftp.Close();
        }
    }
}

這個dll在獲取ftp文件列表方便存在些問題，等我修改下會放出一個改進版本，所以暫時用數據庫保存ftp文件列表先將就下：

數據庫：

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FTP]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[FTP]
GO

CREATE TABLE [dbo].[FTP] (
    [AutoID] [varchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,
    [FileName] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
    [FilePath] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
    [FileDownloadName] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
    [FileSize] [int] NULL ,
    [UploadTime] [datetime] NULL 
) ON [PRIMARY]
GO

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