文件传输协议的简单设计与实现

1、课 程 设 计 课程名称 计算机网络课程设计 题目名称 文件传输协议的简单设计与实现 学生学院 专业班级_ _ 学 号 学生姓名_ _指导教师_ _ 2010 年 1 月 5 日设计摘要关键词：SOCKET编程，FTPclient/server程序摘要：本课程设计包含了文件传输协议的简单设计与实现。文件传送是各种计算机网络实现的基本功能，文件传送协议是一种最基本的应用层协议按照客户/服务器的模式进行工作，提供交互式的访问，是INTERNET使用最广泛的协议之一。文件传输协议的简单设计与实现建立在计算机网络实验环境TCP/IP 网络体系结构之上，使用socket 编程接口编写两个程序，分别为客户

2、程序(client.c)和服务器程序（server.c），实现下述命令功能：get , put, pwd, dir, cd, ？, quit 等，利用了已有网络环境设计并实现简单应用层协议。本设计包括了具体设计任务，基本思路及所涉及的相关理论，设计流程图，调试过程中出现的问题及相应解决办法，实验运行结果，核心程序，个人体会及建议等。目录1、文件传输协议的简单设计与实现-181. 1 具体设计任务-181.2 基本思路及所涉及的相关理论-181.2.1基本思路-182.2.2 相关理论-181.3设计流程图-191.4实验运行情况-191.5 核心程序-22 2.5.1 服务器（sever）程序

3、-22 2.5.2 客户（client）程序-291.6心得体会-37参考文献-382、文件传输协议的简单设计与实现2. 1 具体设计任务计算机网络实验环境建立在TCP/IP 网络体系结构之上。各计算机除了安装TCP/IP 软件外，还安装了TCP/IP 开发系统。实验室各计算机具备Windows环境中套接字socket 的编程接口功能，可为用户提供全网范围的进程通信功能。本实验要求利用这些功能，设计和实现一个简单的文件传送协议。用socket 编程接口编写两个程序，分别为客户程序(client.c)和服务器程序（server.c），该程序应能实现下述命令功能：get：取远方的一个文件put：传

4、给远方一个文件pwd：显示远主当前目录dir：列出远方当前目录cd ：改变远方当前目录？ ：显示你提供的命令quit ：退出返回2.2基本思路及所涉及的相关理论2.2.1基本思路 设计程序使客户端连接的时候，服务器将会向客户端发回一条消息告知它的IP地址，然后关闭连接并继续接收端口的连接。建立各个命令功能对应的函数，发送请求，等待服务器端的服务。服务器端初始化WinSock，创建SOCKET，获取主机信息，并对客户端进行会话，发送回复讯息给客户端，响应完毕后关闭连接，释放WinSock。2.2.2 相关理论 文件传送是各种计算机网络都实现的基本功能，文件传送协议是一种最基本的应用层协议按照客户

5、/服务器的模式进行工作，提供交互式的访问，是INTERNET使用最广泛的协议之一。计算机网络实验环境建立在TCP/IP 网络体系结构之上。各计算机除了安装TCP/IP 软件外，还安装了TCP/IP 开发系统。实验室各计算机具备Windows环境中套接字socket 的编程接口功能，可为用户提供全网范围的进程通信功能。本设计利用这些功能，设计和实现一个简单的文件传送协议。用socket 编程接口编写两个程序，分别为客户程序(client.c)和服务器程序（server.c）。2.3 设计流程图2.4实验运行情况服务器端运行，默认自动启动监听，情况如下图：服务如果关闭监听，效果如下图：客服端运行，

6、如下图：输入服务器端的IP和端口号进行连接，效果如图：下面设置文件保存位置，如图：下面演示上传一个视频文件，然后再下载下来，其中上传过程的进度信息：上传完成后的效果图：下载文件的进度提示信息：下载完成后，指定目录下就有了该文件了：2.5 核心程序2.5.1 服务器（server）程序如下using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;using System.Net;using System.Net.Sockets;using Sys

7、tem.IO;using System.Windows.Forms;namespace TCP文件传输_服务器 class WorkThread byte buffer; int bufferSize= 4096; Thread mythread; Socket handler; public WorkThread(Socket workSocket) handler = workSocket; buffer = new bytebufferSize; mythread = new Thread(BeginCommunication); public void Start() mythread

8、.Start(); public void Abort() mythread.Abort(); private void BeginCommunication() while (true)/从客户端接收数据,直到连接断开 try int reCount = handler.Receive(buffer); string insStr =Encoding.BigEndianUnicode.GetString(buffer, 0, reCount); if (insStr.Substring(0, 4) = "name")/收到下文件请求 string fileName = i

9、nsStr.Substring(5, insStr.Length - 5); SendFile(fileName, handler); else if (insStr.Substring(0, 4) = "boot")/收到获取根目录请求 string listStr = GetFileNames("F:", false); SendString(handler, listStr); else if (insStr.Substring(0, 4) = "path")/收到获取指定目录内容请求 string path = insStr.

10、Substring(5, insStr.Length - 5); string listStr = GetFileNames(path, false); SendString(handler, listStr); else if (insStr.Substring(0, 4) = "Queu")/获取下载文件夹请求,回复完整文件名列表 string path = insStr.Substring(5, insStr.Length - 5); string listStr = GetFileNames(path, true); SendString(handler, list

11、Str); else if (insStr.Substring(0, 4) = "upld")/收到上传文件请求 string reFileName = insStr.Substring(5, insStr.Length - 5); LoadFile(reFileName, handler); else if (insStr.Substring(0, 4) = "quit")/收到断开连接命令 HostQuit(); break; catch HostQuit();break; private void LoadFile(string reFileNam

12、e, Socket handler) try FileStream fs = new FileStream(reFileName, FileMode.Create, FileAccess.Write); handler.Receive(buffer, 8, SocketFlags.None);/接收文件大小 long filesize = BitConverter.ToInt64(buffer, 0); long receiveCount = 0; while (receiveCount < filesize)/接收文件 int readcount = handler.Receive(b

13、uffer, bufferSize, SocketFlags.None); fs.Write(buffer, 0, readcount); receiveCount += readcount; fs.Close(); catch HostQuit(); private void SendFile(string fileNmae, Socket handler) try FileStream fs = new FileStream(fileNmae, FileMode.Open, FileAccess.Read); long size = fs.Length; byte bysize = Bit

14、Converter.GetBytes(size); handler.Send(bysize, 8, SocketFlags.None);/发送文件大小 BinaryReader br = new BinaryReader(fs); int sendcount = 0; while (sendcount < size)/发送文件 int readcount = br.Read(buffer, 0, bufferSize); sendcount += readcount; handler.Send(buffer, readcount, SocketFlags.None); catch Hos

15、tQuit(); private void HostQuit() GlobalValues.canControl.WaitOne(); GlobalValues.canControl.Release(); if (handler.Connected = true) handler.Shutdown(SocketShutdown.Both); handler.Close(); private void SendString(Socket handler,string listStr) byte list = Encoding.BigEndianUnicode.GetBytes(listStr);

16、 byte listcountbuffer = BitConverter.GetBytes(Convert.ToInt64(list.Length); try handler.Send(listcountbuffer, 8, SocketFlags.None);/发送列表大小 int sendcount = 0; while (sendcount < list.Length)/发送列表 if (sendcount + bufferSize < list.Length)/不是最后一次 int i = handler.Send(list, sendcount, bufferSize,

17、SocketFlags.None); sendcount += i; else int i = handler.Send(list, sendcount, list.Length - sendcount, SocketFlags.None);/发送最后一次 sendcount += i; catch (Exception e) MessageBox.Show("连接断开."); /fileOnly=true则获取指定目录及子目录内所有文件信息,fileOnly=false则获取指定目录文件信息及文件夹信息 private string GetFileNames(string

18、 path, bool fileOnly) string listStr = string.Empty; DirectoryInfo drct = new DirectoryInfo(path); foreach (FileSystemInfo fsi in drct.GetFileSystemInfos() if (fsi is FileInfo) /文件 FileInfo fi = (FileInfo)fsi; listStr += fi.FullName; listStr += "n" if (fi.Length < 1024) string sizeStr =

19、 fi.Length.ToString() + "字节" listStr += sizeStr; else if (fi.Length < 1024 * 1024) double temp = Convert.ToDouble(fi.Length) / 1024; string sizeStr = string.Format("0:F1", temp) + "KB" listStr += sizeStr; else if (fi.Length < 1024 * 1024 * 1024) double temp = Conv

20、ert.ToDouble(fi.Length) / 1024 / 1024; string sizeStr = string.Format("0:F1", temp) + "MB" listStr += sizeStr; else double temp = Convert.ToDouble(fi.Length) / 1024 / 1024 / 1024; string sizeStr = string.Format("0:F1", temp) + "GB" listStr += sizeStr; listStr

21、+= "n" listStr += fi.LastWriteTime.ToString("yyyy-MM-dd hh:mm:ss"); listStr += "n" else if (fsi is DirectoryInfo) if (fileOnly) listStr += GetFileNames(fsi.FullName, true); else /文件夹 DirectoryInfo di = (DirectoryInfo)fsi; listStr += di.FullName; listStr += "n"

22、 listStr += "dir" listStr += "n" listStr += di.LastWriteTime.ToString("yyyy-MM-dd hh:mm:ss"); listStr += "n" return listStr; public 服务器() InitializeComponent(); Control.CheckForIllegalCrossThreadCalls = false; string HostName = Dns.GetHostName(); /得到主机名 IPHost

23、Entry IpEntry = Dns.GetHostEntry(HostName); /得到主机IP string strIPAddr = IpEntry.AddressList0.ToString(); tsTxb_IPAdd.Text = strIPAddr; hostIPAddress = IPAddress.Parse(strIPAddr); Server = new IPEndPoint(hostIPAddress,Convert.ToInt32(tsTxb_Port.Text); sock = new Socket(AddressFamily.InterNetwork, Sock

24、etType.Stream, ProtocolType.Tcp); sock.Bind(Server); sock.Listen(10); string str = "正在监听端口 " + tsTxb_Port.Text + "." tsLbl_Status.Text = "状态:" + str; AcceptTh = new Thread(ThAccept); AcceptTh.Start();/开始监听端口/下面是监听和停止监听的按钮事件private void btn_Start_Click(object sender, Eve

25、ntArgs e) tsBtn_Start.Enabled = false; tsBtn_Stop.Enabled = true; Server = new IPEndPoint(hostIPAddress, Convert.ToInt32(tsTxb_Port.Text); sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); sock.Bind(Server); sock.Listen(10); string str = "正在监听端口 " + tsTxb_

26、Port.Text + "." tsLbl_Status.Text = "状态:" + str; AcceptTh = new Thread(ThAccept); AcceptTh.Start(); private void btn_stop_Click(object sender, EventArgs e) tsBtn_Start.Enabled = true; tsBtn_Stop.Enabled = false; try sock.Shutdown(SocketShutdown.Both); catch sock.Close(); tsLbl_St

27、atus.Text = "状态:已停止监听" 2.5.2 客户（client）程序/MyThread.cs中的实现using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Net.Sockets;using System.Threading;using System.Windows.Forms;namespace 客户端_TCP文件传输 public class myThread Thread downloadT

28、h; Thread uploadTh; Socket wordSocket; string fileName; string savePath; byte buffer; const int bufferSize = 4096; ToolStripProgressBar tspBar; ToolStripStatusLabel speed; int startTime=0; long receivecount = 0; long sendCount = 0; int upOrDown = 1;/指示上传或下载 System.Windows.Forms.Timer timer1 = new Sy

29、stem.Windows.Forms.Timer(); public myThread(Socket workSock, string FileName,string SavePath, ref ToolStripProgressBar TspBar, ref ToolStripStatusLabel Speed) wordSocket = workSock; fileName = FileName; savePath = SavePath; buffer = new bytebufferSize; downloadTh = new Thread(new ThreadStart(Downloa

30、d); uploadTh = new Thread(new ThreadStart(Upload); tspBar = TspBar; speed = Speed; public myThread(Socket workSock, string FileName,ref ToolStripProgressBar TspBar, ref ToolStripStatusLabel Speed) wordSocket = workSock; fileName = FileName; buffer = new bytebufferSize; downloadTh = new Thread(new Th

31、readStart(Download); uploadTh = new Thread(new ThreadStart(Upload); tspBar = TspBar; speed = Speed; public void StartDownload() upOrDown = 1; downloadTh.Start(); timer1.Enabled = true; timer1.Interval = 100; timer1.Tick += new EventHandler(timer1_Tick); startTime = System.Environment.TickCount; time

32、r1.Start(); public void StartUpload() upOrDown = 0; uploadTh.Start(); timer1.Enabled = true; timer1.Interval = 50; timer1.Tick += new EventHandler(timer1_Tick); startTime = System.Environment.TickCount; timer1.Start(); void timer1_Tick(object sender, EventArgs e) int spentTime = System.Environment.T

33、ickCount - startTime; if (spentTime != 0) if (upOrDown = 1) double sp = Convert.ToDouble(receivecount) / Convert.ToDouble(spentTime) * 1000 / 1024; if (sp < 1024) speed.Text = tspBar.Value.ToString() + "% 下载速度:" + string.Format("0:F1", sp) + "KB" else speed.Text = ts

34、pBar.Value.ToString() + "% 下载速度:" + string.Format("0:F1", sp / 1024) + "MB/S" else double sp = Convert.ToDouble(sendCount) / Convert.ToDouble(spentTime) * 1000 / 1024; if (sp < 1024) speed.Text = tspBar.Value.ToString() + "% 上传速度:" + string.Format("0:F

35、1", sp) + "KB" else speed.Text = tspBar.Value.ToString() + "% 上传速度:" + string.Format("0:F1", sp / 1024) + "MB/S" private void Download() try string ins = "name=" + fileName; byte data = Encoding.BigEndianUnicode.GetBytes(ins); wordSocket.Send(da

36、ta, data.Length, SocketFlags.None);/发送下载请求 string reFileName = savePath + "" + GetFileName(fileName); Directory.CreateDirectory(savePath); FileStream fs = new FileStream(reFileName, FileMode.Create, FileAccess.Write); wordSocket.Receive(buffer, 8, SocketFlags.None);/接收文件大小 long filesize =

37、BitConverter.ToInt64(buffer, 0); while (receivecount < filesize)/接收文件 int readcount = wordSocket.Receive(buffer, bufferSize, SocketFlags.None); fs.Write(buffer, 0, readcount); receivecount += readcount; tspBar.Value = Convert.ToInt32(Convert.ToDouble(receivecount) / Convert.ToDouble(filesize) * 1

38、00); tspBar.Value = 100; timer1_Tick(new object(), new EventArgs(); fs.Close(); timer1.Stop(); StaticValue.isBusy = false; catch MessageBox.Show("连接断开."); timer1.Stop(); if (wordSocket.Connected = true) wordSocket.Shutdown(SocketShutdown.Both); wordSocket.Close(); timer1.Stop(); StaticValue.isBusy = false; private void Upload() try string shortFileName = fileName.Substring(fileName.LastIndexOf('') + 1, fileName.Length - fileName.LastIndexOf('') - 1); string serverFileName = StaticValue.curServerPath + "" + shortFi