C#实现一个局域网文件传输工具

工作需要，经常会在工作的台式机和笔记本之间传文件或者需要拷贝文本，两个机器都位于局域网内，传文件或者文本的方式有很多种，之前是通过共享文件夹来进行文件的拷贝，或者通过SVN进行同步。文本传递比较简单，可以通过两台机器上装QQ登两个号码，或者在共享目录下建一个TXT，或者发电子邮件等等。

不过上面这些方法总觉得不直接，所以想基于P2P做一个小的局域网文件和文字传输小工具。

WinForm的工程，界面方面的代码就不贴了，大家自己根据喜好设计就好了，主要把TCP数据传输的代码和逻辑贴出来：

1. 文件和文本传输的通用方法：

private string ReceiveControl(Socket socket){    int bufSize = 1024;    byte[] buf = new byte[bufSize];    int len = socket.Receive(buf);    return len > 0 ? Encoding.UTF8.GetString(buf, 0, len) : String.Empty;}

private void SendControl(Socket socket, string controlMsg){    byte[] msgBytes = Encoding.UTF8.GetBytes(controlMsg);    socket.Send(msgBytes);}

private string ReceiveContent(Socket socket, int contentLen){    int receivedLen = 0;    int bufSize = 1024;    byte[] buf = new byte[bufSize];    StringBuilder sb = new StringBuilder();    while (receivedLen < contentLen)    {        int len = socket.Receive(buf);        if (len > 0)        {            sb.Append(Encoding.UTF8.GetString(buf, 0, len));            receivedLen += len;        }    }    return sb.ToString();}

private void SendContent(Socket socket, string content){    byte[] contentBytes = Encoding.UTF8.GetBytes(content);    SendControl(socket, contentBytes.Length.ToString());    ReceiveControl(socket);    socket.Send(contentBytes);}

private void ReceiveFile(Socket socket, string fileName, int fileLen){    string filePath = Path.Combine(GetCurrentUserDesktopPath(), RenameConflictFileName(fileName));    using (Stream fs = new FileStream(filePath, FileMode.Create, FileAccess.ReadWrite))    {        int bufLen = 1024;        int receivedLen = 0;        byte[] buf = new byte[bufLen];        int len = 0;        while (receivedLen < fileLen)        {            len = socket.Receive(buf);            fs.Write(buf, 0, len);            receivedLen += len;        }    }}

private void SendFile(Socket socket, string filePath){    using (Stream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))    {        SendControl(socket, GetFileNameFromPath(filePath));        ReceiveControl(socket);        SendControl(socket, fs.Length.ToString());        ReceiveControl(socket);        int bufLen = 1024;        byte[] buf = new byte[bufLen];        long readLen = 0;        long fileLen = fs.Length;        int len = 0;        while (readLen < fileLen)        {            len = fs.Read(buf, 0, bufLen);            readLen += len;            int sentLen = 0;            int realSent = 0;            int left = 0;            while (sentLen < len)            {                left = len - realSent;                realSent = socket.Send(buf, sentLen, left, SocketFlags.None);                sentLen += realSent;            }        }    }}

2.连接，发送文字/文件，重命名文件等方法：

private void SendText(){    if (connected)    {        if (!String.IsNullOrEmpty(this.TextToSend.Text))        {            string txt = this.TextToSend.Text;            SendControl(clientSocket, "Text");            ReceiveControl(clientSocket);            SendContent(clientSocket, txt);            ReceiveControl(clientSocket);        }    }}private void Connect(){    try    {        if (!connected)        {            passive = false;            IPAddress serverIPAddress = IPAddress.Parse(this.ServerIPAddress.Text);            clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            clientSocket.Connect(serverIPAddress, 60000);            string msg = ReceiveControl(clientSocket);            if (msg.Equals("Connected"))            {                this.ConnectBtn.Text = "Disconnect";                connected = true;            }        }        else        {            passive = true;            SendControl(clientSocket, "Disconnect");            clientSocket.Close();            this.ConnectBtn.Text = "Connect";            connected = false;        }    }    catch (Exception err)    {        MessageBox.Show(string.Format("Failed to connect to server, error: {0}", err.ToString()));    }}private void ServerThread(){    IPAddress local = IPAddress.Parse("0.0.0.0");    Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);    server.Bind(new IPEndPoint(local, 60000));    server.Listen(1);    while (true)    {        Socket receivedClientSocket = server.Accept();        IPEndPoint clientEndPoint = (IPEndPoint)receivedClientSocket.RemoteEndPoint;        SendControl(receivedClientSocket, "Connected");        if (passive)        {            clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            clientSocket.Connect(clientEndPoint.Address, 60000);            string msg = ReceiveControl(clientSocket);            if (msg.Equals("Connected"))            {                connected = true;                this.ConnectBtn.Text = "Disconnect";                this.ServerIPAddress.Text = clientEndPoint.Address.ToString();            }        }        while (connected)        {            string msg = ReceiveControl(receivedClientSocket);            switch (msg)            {                case "Disconnect":                    receivedClientSocket.Close();                    clientSocket.Close();                    this.ConnectBtn.Text = "Connect";                    passive = true;                    connected = false;                    break;                case "Text":                    SendControl(receivedClientSocket, "Received");                    int length = Convert.ToInt32(ReceiveControl(receivedClientSocket));                    SendControl(receivedClientSocket, "Received");                    string content = ReceiveContent(receivedClientSocket, length);                    SendControl(receivedClientSocket, "Received");                    this.TextToSend.Text = content;                    break;                case "File":                    SendControl(receivedClientSocket, "Received");                    string fileName = ReceiveControl(receivedClientSocket);                    SendControl(receivedClientSocket, "Received");                    int fileLen = Convert.ToInt32(ReceiveControl(receivedClientSocket));                    SendControl(receivedClientSocket, "Received");                    ReceiveFile(receivedClientSocket, fileName, fileLen);                    SendControl(receivedClientSocket, "Received");                    MessageBox.Show("File Received");                    break;            }        }    }}private string GetFileNameFromPath(string path){    int index = path.LastIndexOf('\\');    return path.Substring(index + 1);}private string RenameConflictFileName(string originalName){    string desktopPath = GetCurrentUserDesktopPath();    int extensionIndex = originalName.LastIndexOf(".");    string fileName = originalName.Substring(0, extensionIndex);    string extensionName = originalName.Substring(extensionIndex + 1);    int renameIndex = 1;    string newNameSuffix = String.Format("({0})", renameIndex);    string finalName = originalName;    string filePath = Path.Combine(desktopPath, finalName);    if (File.Exists(filePath))    {        finalName = String.Format("{0} {1}.{2}", fileName, newNameSuffix, extensionName);        filePath = Path.Combine(desktopPath, finalName);    }    while (File.Exists(filePath))    {        renameIndex += 1;        string oldNameSuffix = newNameSuffix;        newNameSuffix = String.Format("({0})", renameIndex);        finalName = finalName.Replace(oldNameSuffix, newNameSuffix);        filePath = Path.Combine(desktopPath, finalName);    }    return finalName;}private string GetCurrentUserDesktopPath(){    return Environment.GetFolderPath(System.Environment.SpecialFolder.Desktop);}

运行截图：

完整代码可以到下面的地址下载：

http://download.csdn.net/detail/qwertyupoiuytr/9895436