using System;
using System.Collections.Generic;
using System.Windows.Forms;
//添加的命名空间引用
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace SyncChatServer
{
public partial class MainForm : Form
{
/// <summary>保存连接的所有用户</summary>
private List<User> userList = new List<User>();
/// <summary>使用的本机IP地址</summary>
IPAddress localAddress;
/// <summary>监听端口</summary>
private const int port = 51888;
private TcpListener myListener;
/// <summary>是否正常退出所有接收线程</summary>
bool isNormalExit = false;
public MainForm()
{
InitializeComponent();
listBoxStatus.HorizontalScrollbar = true;
IPAddress[] addrIP = Dns.GetHostAddresses(Dns.GetHostName());
localAddress = addrIP[0];
buttonStop.Enabled = false;
}
/// <summary>【开始监听】按钮的Click事件</summary>
private void buttonStart_Click(object sender, EventArgs e)
{
myListener = new TcpListener(localAddress, port);
myListener.Start();
//调用string的静态方法可以指定输出的格式
AddItemToListBox(string.Format("开始在{0}:{1}监听客户连接", localAddress, port));
//创建一个线程监听客户端连接请求
Thread myThread = new Thread(ListenClientConnect);
myThread.Start();
buttonStart.Enabled = false;
buttonStop.Enabled = true;
}
/// <summary>接收客户端连接</summary>
private void ListenClientConnect()
{
TcpClient newClient = null;
while (true)
{
try
{
//在服务器中，TcpClient对象必须要用AcceptTcpClient();方法获取
newClient = myListener.AcceptTcpClient();
}
catch
{
//当单击“停止监听”或者退出此窗体时AcceptTcpClient()会产生异常
//因此可以利用此异常退出循环
break;
}
//每接受一个客户端连接,就创建一个对应的线程循环接收该客户端发来的信息
User user = new User(newClient);
Thread threadReceive = new Thread(ReceiveData);
threadReceive.Start(user);
userList.Add(user);
AddItemToListBox(string.Format("[{0}]进入", newClient.Client.RemoteEndPoint));
AddItemToListBox(string.Format("当前连接用户数：{0}", userList.Count));
}
}
/// <summary>
/// 处理接收的客户端数据
/// </summary>
/// <param name="userState">客户端信息</param>
private void ReceiveData(object userState)
{
User user = (User)userState;
TcpClient client = user.client;
while (isNormalExit == false)
{
string receiveString = null;
try
{
//从网络流中读出字符串，此方法会自动判断字符串长度前缀，并根据长度前缀读出字符串
receiveString = user.br.ReadString();
}
catch
{
if (isNormalExit == false)
{
AddItemToListBox(string.Format("与[{0}]失去联系，已终止接收该用户信息", client.Client.RemoteEndPoint));
RemoveUser(user);
}
break;
}
AddItemToListBox(string.Format("来自[{0}]：{1}", user.client.Client.RemoteEndPoint, receiveString));
string[] splitString = receiveString.Split(‘,‘);
switch (splitString[0])
{
case "Login":
user.userName = splitString[1];
SendToAllClient(user, receiveString);
break;
case "Logout":
SendToAllClient(user, receiveString);
RemoveUser(user);
return;
case "Talk":
string talkString = receiveString.Substring(splitString[0].Length + splitString[1].Length + 2);
AddItemToListBox(string.Format("{0}对{1}说：{2}",
user.userName, splitString[1], talkString));
SendToClient(user, "talk," + user.userName + "," + talkString);
foreach (User target in userList)
{
if (target.userName == splitString[1] && user.userName != splitString[1])
{
SendToClient(target, "talk," + user.userName + "," + talkString);
break;
}
}
break;
default:
AddItemToListBox("什么意思啊：" + receiveString);
break;
}
}
}
/// <summary>
/// 发送message给user
/// </summary>
/// <param name="user">指定发给哪个用户</param>
/// <param name="message">信息内容</param>
private void SendToClient(User user, string message)
{
try
{
//将字符串写入网络流，此方法会自动附加字符串长度前缀
user.bw.Write(message);
user.bw.Flush();
AddItemToListBox(string.Format("向[{0}]发送：{1}",
user.userName, message));
}
catch
{
AddItemToListBox(string.Format("向[{0}]发送信息失败",
user.userName));
}
}
/// <summary>发送信息给所有客户</summary>
/// <param name="user">指定发给哪个用户</param>
/// <param name="message">信息内容</param>
private void SendToAllClient(User user, string message)
{
string command = message.Split(‘,‘)[0].ToLower();///////////////////////////////////////////////////////////////
if (command == "login")
{
for (int i = 0; i < userList.Count; i++)
{
SendToClient(userList[i], message);//如果是登陆信息，则发给每个用户这个信息
if (userList[i].userName != user.userName)//如果是登陆信息，则也要发给将要登陆的用户已经登陆的用户的名字
{
SendToClient(user, "login," + userList[i].userName);
}
}
}
else if(command=="logout")//如果是登出，则发送给其余的每个用户登出的信息
{
for (int i = 0; i < userList.Count; i++)
{
if (userList[i].userName != user.userName)
{
SendToClient(userList[i], message);
}
}
}
}
/// <summary>移除用户</summary>
/// <param name="user">指定要删除的用户</param>
private void RemoveUser(User user)
{
userList.Remove(user);
user.Close();
AddItemToListBox(string.Format("当前连接用户数：{0}", userList.Count));
}
private delegate void AddItemToListBoxDelegate(string str);
/// <summary>在ListBox中追加状态信息</summary>
/// <param name="str">要追加的信息</param>
private void AddItemToListBox(string str)
{
if (listBoxStatus.InvokeRequired)
{
AddItemToListBoxDelegate d = AddItemToListBox;
listBoxStatus.Invoke(d, str);
}
else
{
listBoxStatus.Items.Add(str);
listBoxStatus.SelectedIndex = listBoxStatus.Items.Count - 1;
listBoxStatus.ClearSelected();
}
}
/// <summary>【停止监听】按钮的Click事件</summary>
private void buttonStop_Click(object sender, EventArgs e)
{
AddItemToListBox("开始停止服务，并依次使用户退出!");
isNormalExit = true;
for (int i = userList.Count - 1; i >= 0; i--)
{
RemoveUser(userList[i]);
}
//通过停止监听让myListener.AcceptTcpClient()产生异常退出监听线程
myListener.Stop();
buttonStart.Enabled = true;
buttonStop.Enabled = false;
}
/// <summary>关闭窗口时触发的事件</summary>
private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
{
if (myListener != null)
{
//引发buttonStop的Click事件
buttonStop.PerformClick();
}
}
}
}