上海大学计算机网络实验报告材料2

《网络与通信》课程实验报告实验2：Socket通信编程附件：系统概述：运行环境、编译、使用方法、实现环境、程序文件列表等；运行环境：Windows7系统下的编译：C#使用方法：为一般窗口程序，双击即可实现环境：Microsoft Visio Studio程序文件列表：主要数据结构；TCP服务端：public partial class TcpServerForm : Form{private Socket _server;private Socket _client;private byte[] _receiveData = new byte[1024];private string _username;private string _password;private bool _needPasswordl;private bool _passwordWrong;public TcpServerForm()private void TcpReceiveForm_Load(object sender, EventArgs e)private void btnListen_Click(object sender, EventArgs e)private void btnDisconnect_Click(object sender, EventArgs e)void AcceptedConnection(IAsyncResult iar)void ReceivedData(IAsyncResult iar)void SentData(IAsyncResult iar)void ProcessDisconnection()private void txtUserName_TextChanged(object sender, EventArgs e)private void txtPassword_TextChanged(object sender, EventArgs e)private void lblUserName_Click(object sender, EventArgs e)private void gnConnectInfo_Enter(object sender, EventArgs e)private void lbMessage_SelectedIndexChanged(object sender, EventArgs e) private void lbNativeIP_SelectedIndexChanged(object sender, EventArgs e) private void lbConnectLog_SelectedIndexChanged(object sender, EventArgs e) }TCP客户端：public partial class TcpClientForm : Form{Socket _client;byte[] _receivedData = new byte[1024];public TcpClientForm()private void btnConnect_Click(object sender, EventArgs e)private void btnDisconnect_Click(object sender, EventArgs e)private void btnSend_Click(object sender, EventArgs e)void Connected(IAsyncResult iar)void ReceivedData(IAsyncResult iar)void SentData(IAsyncResult iar)void ProcessDisconnection()private void txtIP_TextChanged(object sender, EventArgs e)}UDP接收端：public partial class UdpReceiveForm : Form{private bool ReadFlag = true;private Thread th;private IPEndPoint remote;private UdpClient server;private int count = 0;private double num;public UdpReceiveForm()private void read()private void btnReceive_Click(object sender, EventArgs e)private void UdpReceiveForm_FormClosing(object sender, FormClosingEventArgs e) }UDP发送端：public partial class UdpSendForm : Form{public UdpSendForm()private void btnSend_Click(object sender, EventArgs e)private void txtIP_TextChanged(object sender, EventArgs e)private void lblInfo_Click(object sender, EventArgs e)}主要算法描述；异步调用与回调(部分)：TCP服务端：_server.BeginAccept(new AsyncCallback(AcceptedConnection), _server);//异步调用,开始接收连接 -> void AcceptedConnection(IAsyncResult iar)_client.BeginSend(sendMessage, 0, sendMessage.Length, SocketFlags.None, new AsyncCallback(SentData), _client);//异步调用,消息发送完毕执行->void SentData(IAsyncResult iar)_client.BeginReceive(_receiveData, 0, _receiveData.Length, SocketFlags.None, new AsyncCallback(ReceivedData), _client);//密码正确，开始接收消息->void ReceivedData(IAsyncResult iar)用户使用手册；TCP客户端、TCP服务端：1、用户打开TCP客户端并且输入服务端IP、用户名与密码（密码事先在服务端设置好）；2、服务端点击“开始监听”，客户端点击“连接”；3、客户端在消息框输入消息，点击“发送”，则消息发送到服务端，；4、服务端接收并且在“接收到的消息”框里显示消息与发送消息时的日期；注：客户端与服务端均能断开连接。

一、UDP发送端、UDP接收端：1、用户打开UDP发送端并且输入目标IP、需发送的消息；2、点击“发送按钮”；3、接收端点击“接收”则接收到消息。

程序源代码；Tcp服务端：using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using ;using .Sockets;namespace TCP服务端{public partial class TcpServerForm : Form{private Socket _server;private Socket _client;private byte[] _receiveData = new byte[1024];private string _username;private string _password;private bool _needPasswordl;private bool _passwordWrong;public TcpServerForm(){InitializeComponent();}private void TcpReceiveForm_Load(object sender, EventArgs e){IPAddress[] addressList = Dns.GetHostAddresses(Dns.GetHostName());foreach (IPAddress ip in addressList){if (ip.ToString().Length <= 15)lbNativeIP.Items.Insert(0, ip.ToString());}btnDisconnect.Enabled = false;}private void btnListen_Click(object sender, EventArgs e){_username = txtUserName.Text;_password = txtPassword.Text; //设置用户名与密码_server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//新建协议为tcp的socket_server.Bind(new IPEndPoint(IPAddress.Any, 8000));//监听端口为8000_server.Listen(5);//开始监听_server.BeginAccept(new AsyncCallback(AcceptedConnection), _server);//异步调用,开始接收连接this.lblStatus.Text = "开始监听...";btnListen.Enabled = false;txtUserName.Enabled = false;txtPassword.Enabled = false;_needPasswordl = true;_passwordWrong = false;//处理逻辑}private void btnDisconnect_Click(object sender, EventArgs e){_client.Close();_needPasswordl = true;_server.BeginAccept(new AsyncCallback(AcceptedConnection), _server);this.lblStatus.Text = "开始监听...";}void AcceptedConnection(IAsyncResult iar){_client = ((Socket)iar.AsyncState).EndAccept(iar);//终止接收连接this.lblStatus.Text = "连接到:" + _client.RemoteEndPoint.ToString();//解析对方地址与端口byte[] sendMessage = Encoding.Default.GetBytes(DateTime.Now.TimeOfDay + ":请发送用户与密码");//向客户端提出发送密码的请求lbConnectLog.Items.Insert(0, "连接到:" + _client.RemoteEndPoint.ToString());_client.BeginSend(sendMessage, 0, sendMessage.Length, SocketFlags.None, new AsyncCallback(SentData), _client);//异步调用,消息发送完毕执行SentDatabtnDisconnect.Enabled = true;}void ReceivedData(IAsyncResult iar){_client = (Socket)iar.AsyncState;int recv = 0;try{recv = _client.EndReceive(iar);}catch{ProcessDisconnection();}//解析消息if (recv == 0)//解析失败{_client.Close();this.lblStatus.Text = "等待连接...";_server.BeginAccept(new AsyncCallback(AcceptedConnection), _server);return;}string receiveMessage = Encoding.Default.GetString(_receiveData, 0, recv);this.lbMessage.Items.Insert(0,receiveMessage);//将消息放入消息列表byte[] feedbackMessage;if(_needPasswordl){string receiveUsername = receiveMessage.Substring(stIndexOf(":") + 1, receiveMessage.IndexOf("#") - (stIndexOf(":") + 1));string receivePassword = receiveMessage.Substring(receiveMessage.IndexOf("#") + 1, receiveMessage.Length - (receiveMessage.IndexOf("#") + 1));if(receiveUsername == _username && receivePassword == _password){_needPasswordl = false;_passwordWrong = false;feedbackMessage = Encoding.Default.GetBytes(DateTime.Now.TimeOfDay + ":验证成功_" + receiveMessage);_client.BeginSend(feedbackMessage, 0, feedbackMessage.Length, SocketFlags.None, new AsyncCallback(SentData), _client);}else{this.lbConnectLog.Items.Insert(0, receiveUsername + "#" + receivePassword + "验证失败"); feedbackMessage = Encoding.Default.GetBytes(DateTime.Now.TimeOfDay + ":验证失败_" + receiveMessage);_passwordWrong = true;_client.BeginSend(feedbackMessage, 0, feedbackMessage.Length, SocketFlags.None, new AsyncCallback(SentData), _client);return;}}feedbackMessage = Encoding.Default.GetBytes(DateTime.Now.TimeOfDay + ":成功接收" + receiveMessage);_client.BeginSend(feedbackMessage, 0, feedbackMessage.Length, SocketFlags.None, new AsyncCallback(SentData), _client);}void SentData(IAsyncResult iar){_client = (Socket)iar.AsyncState;int sent = _client.EndSend(iar);if (_passwordWrong){lbConnectLog.Items.Insert(0, "主动断开连接" + _client.RemoteEndPoint.ToString());_client.Close();_needPasswordl = true;_server.BeginAccept(new AsyncCallback(AcceptedConnection), _server);//重新开始接收新的连接ProcessDisconnection();}_client.BeginReceive(_receiveData, 0, _receiveData.Length, SocketFlags.None, new AsyncCallback(ReceivedData), _client);//密码正确，开始接收消息}void ProcessDisconnection(){this.lblStatus.Text = "已断开连接！重新监听...";lbConnectLog.Items.Insert(0, "已经断开连接");this.btnDisconnect.Enabled = false;}private void txtUserName_TextChanged(object sender, EventArgs e){}private void txtPassword_TextChanged(object sender, EventArgs e){}private void lblUserName_Click(object sender, EventArgs e){}private void gnConnectInfo_Enter(object sender, EventArgs e){}private void lbMessage_SelectedIndexChanged(object sender, EventArgs e){}private void lbNativeIP_SelectedIndexChanged(object sender, EventArgs e) {}private void lbConnectLog_SelectedIndexChanged(object sender, EventArgs e)}}}TCP客户端：using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using ;using .Sockets;namespace TCP客户端{public partial class TcpClientForm : Form{Socket _client;byte[] _receivedData = new byte[1024];public TcpClientForm(){InitializeComponent();}private void btnConnect_Click(object sender, EventArgs e) {this.lblStatus.Text = "连接中...";_client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//建立一个协议为TCP的socketIPEndPoint iep = new IPEndPoint(IPAddress.Parse(this.txtIP.Text), 8000);//设置端口为8000 _client.BeginConnect(iep, new AsyncCallback(Connected), _client);//异步调用,开始连接服务端this.btnConnect.Enabled = false;this.btnDisconnect.Enabled = true;}private void btnDisconnect_Click(object sender, EventArgs e){_client.Close();this.lblStatus.Text = "连接断开!";this.btnConnect.Enabled = true;this.btnDisconnect.Enabled = false;}private void btnSend_Click(object sender, EventArgs e){byte[] message = Encoding.Default.GetBytes(DateTime.Now.TimeOfDay + ":" +this.txtMessage.Text);//将文本框里的东西整合成消息txtMessage.Focus();try{_client.BeginSend(message, 0, message.Length, SocketFlags.None, newAsyncCallback(SentData), _client);//开始发送txtMessage.Clear();}catch{ProcessDisconnection();}}void Connected(IAsyncResult iar){_client = (Socket)iar.AsyncState;try{_client.EndConnect(iar);//关闭连接请求this.lblStatus.Text = "连接到:" + _client.RemoteEndPoint.ToString();_client.BeginReceive(_receivedData, 0, _receivedData.Length, SocketFlags.None, new AsyncCallback(ReceivedData), _client);//异步调用,开始接收消息}catch{ProcessDisconnection();return;}}void ReceivedData(IAsyncResult iar){Socket remote = (Socket)iar.AsyncState;int recv;try{recv = remote.EndReceive(iar);}catch{ProcessDisconnection();}if (recv == 0){_client.Close();ProcessDisconnection();return;}string receiveMessage = Encoding.Default.GetString(_receivedData, 0, recv);//将收到的消息处理为字符串this.lbMessage.Items.Insert(0, receiveMessage);//将收到的消息放到消息列表if(receiveMessage.Substring(stIndexOf(":") + 1, receiveMessage.Length - (stIndexOf(":") + 1)) == "请发送用户与密码"){byte[] usernameAndPassword = Encoding.Default.GetBytes(DateTime.Now.TimeOfDay + ":" + txtUserName.Text + "#" + txtPassword.Text).ToArray();try{_client.BeginSend(usernameAndPassword, 0, usernameAndPassword.Length, SocketFlags.None, new AsyncCallback(SentData), _client);//向服务端发送用户名和密码}catch{ProcessDisconnection();return;}}//try{_client.BeginReceive(_receivedData, 0, _receivedData.Length, SocketFlags.None, newAsyncCallback(ReceivedData), _client);}catch{ProcessDisconnection();return;}}void SentData(IAsyncResult iar){Socket remote = (Socket)iar.AsyncState;int sent = remote.EndSend(iar);try{remote.BeginReceive(_receivedData, 0, _receivedData.Length, SocketFlags.None, new AsyncCallback(ReceivedData), remote);}catch{ProcessDisconnection();return;}}void ProcessDisconnection(){this.lblStatus.Text = "发送端已经断开连接，或者接收端已经关闭！请重新尝试连接！"; this.btnConnect.Enabled = true;btnDisconnect.Enabled = false;}private void txtIP_TextChanged(object sender, EventArgs e){}}}UDP发送端：using System;using System.Collections.Generic;using ponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using ;using .Sockets;//using System.Threading;namespace UDP发送端{public partial class UdpSendForm : Form{public UdpSendForm(){InitializeComponent();}private void btnSend_Click(object sender, EventArgs e) {//创建UDP网络服务UdpClient SendUdp = new UdpClient();IPAddress remoteIP;//判断IP地址的正确性try{remoteIP = IPAddress.Parse(txtIP.Text);}catch{MessageBox.Show("请输入正确的IP地址！", "错误");return;}IPEndPoint remoteep = new IPEndPoint(remoteIP, 8010);//端口设置为8010Byte[] buffer = null;Encoding enc = Encoding.Unicode;buffer = enc.GetBytes(txtMessage.Text.ToCharArray());//将此实例中的字符复制到 Unicode 字符数组。