ASP.net操作FTP(下)

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();
        }
    }
}

这个dll在获取ftp文件列表方便存在些问题，等我修改下会放出一个改进版本，所以暂时用数据库保存ftp文件列表先将就下：

数据库：

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