Tcp与Ip协议的客户端和服务器编程
Tcp与Ip协议的客户端和服务器编程
本文就TCP和Ip协议的客户端和服务器分别进行编程，实现了客户端和服务端进行通信的功能，服务端对多个客户端进行监听，并能与多个客户端通信。
服务器端代码如下：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.IO; using System.Linq; using System.Net; using System.Net.Sockets; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Windows.Forms; namespace 服务端 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { Control.CheckForIllegalCrossThreadCalls = false; } /// <summary> /// 获取本机IP地址 /// </summary> /// <returns>返回一个IP</returns> private string GetIpAddress() { string hostName = Dns.GetHostName();//获取本机名 IPHostEntry localhost = Dns.GetHostByName(hostName);//方法已过期了，只能得到一个IPV4的地址 IPAddress localaddr = localhost.AddressList[0]; return localaddr.ToString(); } private void btnStart_Click(object sender, EventArgs e) { try { //当点击开始监听时，在服务器端创建一个负责监听IP地址和端口号的Socket //IP V4,流式服务，TCP协议 Socket socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPAddress ip = IPAddress.Any; //IPAddress.Parse(txtServer.Text);我的理解是获取本机IP txtServer.Text = GetIpAddress();//将IP地址给文本 //创建端口号对象 IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text)); //监听 socketWatch.Bind(point); ShowMsg("监听成功"); socketWatch.Listen(10);//一次监听10 人 ///创建一个线程来监听，否则没监听时就卡死了 Thread th = new Thread(Listen); th.IsBackground = true; th.Start(socketWatch); } catch { } } Dictionary<string, Socket> dicSock = new Dictionary<string, Socket>();//创建键值对来存放IP和socket Socket socketSend; void Listen(object o)//必须用object类型 ，因为线程要使用 { Socket socketWatch = o as Socket;//将传递过来的参数转换为Socket类型 while (true) { try { //等待客户端的连接 并且创建一个负责通信的Socket socketSend = socketWatch.Accept(); //获得远端 IP+端口号：连接成功 ShowMsg(socketSend.RemoteEndPoint.ToString() + ":" + "连接成功"); dicSock.Add(socketSend.RemoteEndPoint.ToString(), socketSend); //将IP地址添加到下拉列表中 comboBox1.Items.Add(socketSend.RemoteEndPoint.ToString()); Thread th = new Thread(ReciveMsg);//在线程中只写方法名，括号和里面的参数不写在这里 th.IsBackground = true;//写为后台线程，这样关闭窗口时线程就关闭了，否则关闭不了，会报错 th.Start(socketSend); } catch { } } } /// <summary> /// 用来接收客户端发送来的信息，线程来调用他 /// </summary> /// <param name="o"></param> void ReciveMsg(object o) { Socket socketSend = o as Socket; while (true) { try { //连接成功之后，客户端就要给服务端发送数据了 byte[] buffer = new byte[1024 * 1024 * 2]; int r = socketSend.Receive(buffer);//实际接收到的有效字符 if (r == 0) { break; } string str = Encoding.UTF8.GetString(buffer, 0, r); ShowMsg(socketSend.RemoteEndPoint + ":" + str); } catch { } } } /// <summary> /// 在上面一个文本框中显示信息的方法 /// </summary> /// <param name="str"></param> void ShowMsg(string str) { txtLOg.AppendText(str + "\r\n");//写AppendText追加，不然会覆盖 } /// <summary> /// 服务端给客户端发送消息 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void button4_Click(object sender, EventArgs e) { try { if (comboBox1.Text == "") { MessageBox.Show("请选中一个客户端地址再发送消息", "谢谢"); } string str = textBox4.Text; textBox4.Clear(); byte[] buffer = System.Text.Encoding.UTF8.GetBytes(str); List<byte> list = new List<byte>(); list.Add(0); list.AddRange(buffer); byte[] newbuffer = list.ToArray(); string ip = comboBox1.SelectedItem.ToString(); dicSock[ip].Send(newbuffer);//通过键IP地址找到值socketSend //socketSend.Send(buffer); } catch { } } private void button2_Click(object sender, EventArgs e) { if (comboBox1.Text == "") { MessageBox.Show("请选择一个客户端IP地址再选择要发送的文件", "提示！"); } else { OpenFileDialog ofd = new OpenFileDialog(); ofd.Title = "请选择要发送的文件"; ofd.InitialDirectory = @"C:\Users\Administrator\Desktop"; ofd.Filter = "所有文件|*.*"; ofd.ShowDialog(); textBox5.Text = ofd.FileName;//获得选中的一个文件名 } } /// <summary> /// 发送文件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void button3_Click(object sender, EventArgs e) { try { //发送文件 string path = textBox5.Text; using (FileStream fsRead = new FileStream(path, FileMode.Open, FileAccess.Read)) { byte[] buffer = new byte[1024 * 1024 * 5]; int r = fsRead.Read(buffer, 0, buffer.Length); List<byte> list = new List<byte>(); list.Add(1); list.AddRange(buffer); byte[] newbuffer = list.ToArray(); //int r= fsRead.Read(newbuffer , 0, newbuffer.Length);//实际读取的有效字节 dicSock[comboBox1.SelectedItem.ToString()].Send(newbuffer, 0, r + 1, SocketFlags.None); } } catch { } } ///让客户端震动 private void button5_Click(object sender, EventArgs e) { try { if (comboBox1.Text == "") { MessageBox.Show("请选择一个客户端IP地址再震动", "提示！"); } else { byte[] buffer = new byte[1]; buffer[0] = 2; dicSock[comboBox1.SelectedItem.ToString()].Send(buffer); } } catch { } } } }
客户端代码如下：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.IO; using System.Linq; using System.Net; using System.Net.Sockets; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Windows.Forms; namespace 客户端 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } Socket socketConnect = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); private void button1_Click(object sender, EventArgs e) { try { //建立负责通讯的Socket if (textBox1.Text == "" || textBox2.Text == "") { MessageBox.Show("IP地址或者端口号不能为空", "去你大爷的！"); } IPAddress ip = IPAddress.Parse(textBox1.Text); IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(textBox2.Text)); socketConnect.Connect(point); ShowMsg("连接成功"); Thread th = new Thread(Receive); th.IsBackground = true; th.Start(); } catch { } } void ShowMsg(string str) { textBox3.AppendText(str + "\r\n"); } private void button2_Click(object sender, EventArgs e) { try { //客户端要给服务器发送消息 string str = textBox4.Text.Trim();//Trim()就是把所写内容前后空格去除 byte[] buffer = Encoding.UTF8.GetBytes(str);//System.Text.Encoding.UTF8.GetBytes(str); socketConnect.Send(buffer); textBox4.Clear(); } catch { } } ///写一个不断接收服务端发过来的消息的方法，创建线程来调用他 void Receive() { try { while (true)//不停的接收 { byte[] buffer = new byte[1024 * 1024 * 3]; int r = socketConnect.Receive(buffer);//实际接收到的有效字节数 if (r == 0) { break; } if (buffer[0] == 0)//接收到文字 { string str = Encoding.UTF8.GetString(buffer, 1, r - 1); ShowMsg(socketConnect.RemoteEndPoint + ":" + str); } else if (buffer[0] == 1) { //接收的是文件 SaveFileDialog ofd = new SaveFileDialog();//保存对话框 ofd.Title = "请选择保存文件的路径"; ofd.InitialDirectory = @"C:\Users\Administrator\Desktop"; ofd.Filter = "所有文件|*.*"; ofd.ShowDialog(this); string path = ofd.FileName; using (FileStream fsWrite = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write)) { fsWrite.Write(buffer, 1, r - 1); } MessageBox.Show("保存成功", "kao"); } else if(buffer [0]==2) { ZD(); } } } catch { } } /// <summary> /// 写个方法来使窗体震动 /// </summary> void ZD() { for (int i = 0; i < 500; i++) { this.Location = new Point(200 , 200); this.Location = new Point(280 , 280); } } private void Form1_Load(object sender, EventArgs e) { Control.CheckForIllegalCrossThreadCalls = false; } } }
