毕业设计FTP服务器端

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;

namespace Client
{
///

/// Form1 的摘要说明。
///

public class ftpS : System.Windows.Forms.Form
{
TcpListener myListener;

private System.Windows.Forms.ListBox listBox1;
private System.Windows.Forms.Button buttonStart;
private System.Windows.Forms.Button buttonStop;
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox textBox1;
///

/// 必需的设计器变量。
///

private System.ComponentModel.Container components = null;

public ftpS()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

///

/// 清理所有正在使用的资源。
///

protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码

private void InitializeComponent()
{
this.listBox1 = new System.Windows.Forms.ListBox();
this.buttonStart = new System.Windows.Forms.Button();
this.buttonStop = new System.Windows.Forms.Button();
this.groupBox1 = new System.Windows.Forms.GroupBox();
this.label1 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.groupBox1.SuspendLayout();
this.SuspendLayout();
//
// listBox1
//
this.listBox1.ItemHeight = 12;
this.listBox1.Location = new System.Drawing.Point(24, 24);
this.listBox1.Name = "listBox1";
this.listBox1.Size = new System.Drawing.Size(368, 184);
this.listBox1.TabIndex = 0;
//
// buttonStart
//
this.buttonStart.Location = new System.Drawing.Point(256, 232);
this.buttonStart.Name = "buttonStart";
this.buttonStart.TabIndex = 1;
this.buttonStart.Text = "开始监听";
this.buttonStart.Click += new System.EventHandler(this.buttonStart_Click);
//
// buttonStop
//
this.buttonStop.Enabled = false;
this.buttonStop.Location = new System.Drawing.Point(352, 232);
this.buttonStop.Name = "buttonStop";
this.buttonStop.TabIndex = 1;
this.buttonStop.Text = "停止监听";
this.buttonStop.Click += new System.EventHandler(this.buttonStop_Click);
//
// groupBox1
//
this.groupBox1.Controls.Add(this.listBox1);
this.groupBox1.Location = new System.Drawing.Point(16, 8);
this.groupBox1.Name = "groupBox1";
this.groupBox1.Size = new System.Drawing.Size(408, 216);
this.groupBox1.TabIndex = 2;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "传递情况";

//
// label1
//
this.label1.Location = new System.Drawing.Point(24, 232);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(48, 23);
this.label1.TabIndex = 3;
this.label1.Text = "主目录";
this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(80, 232);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(152, 21);
this.textBox1.TabIndex = 4;
this.textBox1.Text = "d:\\";
//
// ftpS
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(440, 261);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.label1);
this.Controls.Add(this.groupBox1);
this.Controls.Add(this.buttonStart);
this.Controls.Add(this.buttonStop);
this.Name = "ftpS";
this.Text = "FTPServer";
this.Closing += new System.ComponentModel.CancelEventHandler(this.ftpS_Closing);
this.groupBox1.ResumeLayout(false);
this.ResumeLayout(false);

}
#endregion

private void buttonStart_Click(object sender, System.EventArgs e)
{
this.listBox1.Items.Add("开始监听……");
myListener=new TcpListener(2770);//端口号2770
myListener.Start();
Thread myThread=new Thread(new ThreadStart(ReceiveData));
myThread.Start();
this.buttonStart.Enabled = false;
this.buttonStop.Enabled =true;
}

private void ReceiveData()
{
TcpClient newClient;
while(true)
{
try
{
newClient=myListener.AcceptTcpClient();//等待用户进入
}
catch
{
myListener.Stop();//当单击“停止监听”或者退出时AcceptTcpClient()会产生异常
break;
}
Receive tp=new Receive(newClient,ref listBox1,ref textBox1);
Thread thread=new Thread(new ThreadStart(tp.processService));
thread.Start();
}
}

private void buttonStop_Click(object sender, System.EventArgs e)
{
try
{
myListener.Stop();
}
catch
{}
this.buttonStop.Enabled = false;
this.buttonStart.Enabled = true;
}

private void ftpS_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
buttonStop_Click(null,null);
}
}

public class Receive
{
private TcpClient client;
private ListBox listbox;
private TextBox textbox;
public Receive(TcpClient tcpclient,ref ListBox listbox,ref TextBox textbox)
{
client=tcpclient;
this.listbox=listbox;
this.textbox=textbox;
}

public void processService()
{
NetworkStream netStream=client.GetStream();
StreamReader sr=new StreamReader(netStream,System.Text.Encoding.Unicode);
StreamWriter sw=new StreamWriter(netStream,System.Text.Encoding.Unicode);
sw.WriteLine("220");
sw.Flush();
listbox.Items.Add("有用户连接，发送:220");
while(true)
{
string str="";
try
{
str=sr.ReadLine();//当用户非正常断开连接时，可能会产生异常
}
catch
{
listbox.Items.Add("用户意外断开连接。");
break;
}
//当用户非正常断开连接时，即使不出现异常，接收字符串也会为null
if(str==null)
{
listbox.Items.Add("用户意外断开连接。");
break;
}
else
{
listbox.Items.Add("收到:"+str);
}
string command="";
string parameter="";
int index=str.IndexOf(" ");
if(index>-1)
{
command=str.Substring(0,index);
parameter=str.Substring(index+1);
//将用户发送的虚拟目录转换为实际目录
parameter=parameter.Replace("server:",textbox.Text);
}
else
{
command=str;
}
FileStream fs=null;
switch(command)
{
case "LIST":
//LIST表示用户希望得到指定目录下的子目录列表
string[] dir=Directory.GetDirectories(parameter);
string sendstr="";
for(int i=0;i{
//将实际目录换为虚拟目录
dir[i]=dir[i].Replace(textbox.Text,"server:");
sendstr+=dir[i]+"@";
}
//去掉最后一个@
if(sendstr.Length>0)
{
sendstr=sendstr.Substring(0,sendstr.Length-1);
}
// 发送125到用户，意思为服务器准备传送数据
sw.WriteLine("125");
sw.Flush();
listbox.Items.Add("发送:125");
//发送子目录到用户
sw.WriteLine(sendstr);
sw.Flush();
listbox.Items.Add("发送目录名:"+sendstr);
//得到文件列表
string[] files=Directory.GetFiles(parameter);
sendstr="";
for(int i=0;i{
//将实际目录换为虚拟目录
files[i]=files[i].Replace(textbox.Text,"server:");
sendstr+=files[i]+"@";
}
//去掉最后一个@
if(sendstr.Length>0)
{
sendstr=sendstr.Substring(0,sendstr.Length-1);
}
//发送文件名到用户
sw.WriteLine(sendstr);
sw.Flush();
listbox.Items.Add("发送文件名:"+sendstr);
break;
case "RETR":
//下载文件
try
{
//如果文件有问题，构造文件流会产生异常
fs=new FileStream(parameter,FileMode.Open,FileAccess.Read);
}
catch
{
fs.Close();
break;
}
// 发送150到用户，意思为服务器文件状态良好
sw.WriteLine("150");
sw.Flush();
listbox.Items.Add("发送:150");
//发送文件长度
sw.WriteLine(fs.Length.ToString());
sw.Flush();
listbox.Items.Add("发送:"+fs.Length.ToString()+"字节");
for(int i=0;i{
netStream.WriteByte((byte)fs.ReadByte());
netStream.Flush();
}
fs.Close();
break;
case "QUIT":
//关闭TCP连接并释放与其关联的所有资源
client.Close();
listbox.Items.Add("关闭与该用户的连接");
return;
}
}
//关闭TCP连接并释放与其关联的所有资源
client.Close();
}
}
}