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asp.net中操作ftp的方法

2007-04-11 15:49 363 查看

作者：LoveCherry 转贴自：http://www.cnblogs.com/lovecherry 点击数：479

的时候我们上传东西不想传到web目录而是ftp服务器，这样可以不占用服务器宝贵空间，以前发过一个tips中提到利用ftpsupport.dll操作ftp的方法，可能当时没有说清楚，网友要求给个清楚的例子，就随便写了个文件可以上传，下载，删除ftp上的文件：

首先，dll 点击这里下载，别忘记给项目添加引用

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 的摘要说明。
/// </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 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </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();
}
}
}

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

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