服务器端程序

服务器端程序

public partial class teacher : Form

{ //定义对象变量

private Thread serverThread; //定义服务器线程对象

private Thread recvThread;

privateTcpListenertch_TcpListener;

privateNetworkStreamnetworkstream;

privateStreamReaderstreamreader;

privateStreamWriterstreamwriter;

private Socket socketforclient;

private void Listen()//教师机监听方法定义

{

try

{ Int32 port = Int32.Parse(text_port.Text); //将文本框输入的端口号转换后赋予变量port IPAddressipaddress = (IPAddress)Dns.GetHostAddresses(Dns.GetHostName()).GetValue(0);

//获取主机IP地址TcpListenertch_TcpListener = new TcpListener(ipaddress, port); //实例化监听对象

tch_TcpListener.Start(10);//开始侦听，并发接收数为10

listBox1.Items.Add("服务已启动！");

button_up.Enabled = false;

button_stop.Enabled = true;

button_send.Enabled = true;

socketforclient = tch_TcpListener.AcceptSocket(); //返回可以用以处理链接的Socket实例if(socketforclient.Connected) // 如果连接成功

{

listBox1.Items.Add("教师机成功连接上学生机！");

networkstream = new NetworkStream(socketforclient); //实例化流对象

streamreader = new StreamReader(networkstream);

streamwriter = new StreamWriter(networkstream);

recvThread = new Thread(new ThreadStart(RecvData)); //启动接收进程

recvThread.Start();

} //接收进程开始接收数据

}

catch (Exception exc)

{

MessageBox.Show(exc.Message,"教师机提示！");

}

}

private void RecvData() //接收信息方法

{

string msg = streamreader.ReadLine(); //从当前流中读取一行字符并将数据作为字符串返回while (!msg.Equals("exit")) // 如果接收到的学生机信息不是"exit"，就不断接收信息{

listBox1.Items.Add("学生提问：" + msg );

msg = streamreader.ReadLine();

}

button_up.Enabled = true;

button_stop.Enabled = false;

button_send.Enabled = false;

listBox1.Items.Add("学生机已经关闭！");

listBox1.Items.Add("教师机关闭！");

ReleaseResource(); //调用释放资源方法

}

private void Send_data()//发送数据方法

{

if (text_tech.Text != "")

{

listBox1.Items.Add("老师说：" + text_tech.Text);

streamwriter.WriteLine(text_tech.Text); //向当前的数据流写入一行字符串，发送数据。streamwriter.Flush(); // 刷新当前数据流中的数据

text_tech.Text = "";

}

else

{ MessageBox.Show("发送信息不能为空","教师机提示");}

}

private void ReleaseResource()// 释放资源方法，关闭所有对象，关闭连接{

networkstream.Close();

streamwriter.Close();

streamreader.Close();

socketforclient.Shutdown(SocketShutdown.Both);//SocketShutdown枚举类型:

//SocketShutdown.Send禁止Socket发送数据；

//SocketShutdown.Receive禁止Socket接收数据；

//SocketShutdown.Both禁止Socket接收和发送数据；socketforclient.Close();

}

public teacher() //教师机的构造函数，系统自动产生的

{

InitializeComponent();

System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;

}

private void Form1_Load(object sender, EventArgs e)

{

button_send.Enabled = false; //发送按钮不可用button_stop.Enabled = false;

}

private void button_up_Click(object sender, EventArgs e)

{

serverThread = new Thread(new ThreadStart(Listen)); //建立一个线程，调用监听方法serverThread.Start(); // new ThreadStart(Listen)：为Listen建立一个委托}

private void button_stop_Click(object sender, EventArgs e)

{

if (button_stop.Enabled == true)

{ // 停止服务后，允许启动服务，但不允许发送信息

button_up.Enabled = true;

button_stop.Enabled = false;

button_send.Enabled = false;

string Exit_msg = "exit"; //要退出时，发送exit信息给学生机streamwriter.WriteLine(Exit_msg);

streamwriter.Flush(); //刷新发送缓冲区

listBox1.Items.Add("教师机关闭！");

recvThread.Abort(); //停止接收线程

ReleaseResource(); //释放资源，关闭所使用的对象

}

else

{

button_up.Enabled = true;

button_stop.Enabled = false;

button_send.Enabled = false;

listBox1.Items.Add("教师机关闭！");

tch_TcpListener.Stop();//终止与客户机的连接

serverThread.Abort();

}

}

private void button_send_Click(object sender, EventArgs e)

{

Thread Send_Thread = new Thread(new ThreadStart(Send_data));

Send_Thread.Start(); // new ThreadStart(Send_data)：为Send_data函数建立一个委托}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)

{ //在没有停止服务前，不允许关闭窗体

if (button_up.Enabled == false )

{

MessageBox.Show("请先停止服务，再退出！", "教师机提示");

e.Cancel = true;

}

}

}

}