怎么使用Socket实现局域网聊天
局域网通常是分布在一个有限地理范围内的网络系统，一般所涉及的地理范围只有几公里。局域网专用性非常强，具有比较稳定和规范的拓扑结构。这篇文章主要为大家详细介绍了C#使用Socket实现局域网聊天的方法，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
C#代码：
servlet服务端
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
namespace Server
{
public partial class MainForm : Form
{
private TcpListener listener;
private Dictionary
private bool tag = true;
private StringBuilder charList;
public MainForm()
{
InitializeComponent();
Control.CheckForIllegalCrossThreadCalls = false;
}
void Bu_StartClick(object sender, EventArgs e)
{
cb_chatList.Items.Clear();
selectChat.Text="";
int port = 8888;
//创建服务端，并且启动
try{
listener = new TcpListener(IPAddress.Parse(ipAddress()),port);
listener.Start();
bu_Start.Enabled = false;
bu_stop.Enabled = true;
}catch(Exception ex)
{
MessageBox.Show("服务器启动失败， 原因："+ex.Message);
bu_Start.Enabled = true;
bu_stop.Enabled = false;
return;
}
selectChat.Text = "服务器启动成功，访问IP："+ipAddress()+" 端口号："+port;
//记录住连接的客户端
socketList = new Dictionary
charList = new StringBuilder();
//使用多线程，用于多个客户端接入
Thread th = new Thread(new ThreadStart(executeTask));
th.Start();
}
public void executeTask()
{
while(tag)
{
//等待用户连接
TcpClient client = null;
try{
client = listener.AcceptTcpClient();
}catch(Exception)
{
}
Thread th = new Thread(executeRead);
th.Start((Object)client);
}
}
public void executeRead(Object pamars)
{
//永久监听读取客户端
TcpClient client = pamars as TcpClient;
while(tag)
{
NetworkStream ns = client.GetStream();
StreamReader sr = new StreamReader(ns);
String msg = String.Empty;
String people = String.Empty;
try {
msg = sr.ReadLine();
if(msg.IndexOf("
{
msg = Regex.Split(msg,"=")[1];
cb_chatList.Items.Add(msg);
charList.Append(msg).Append("<@>");
socketList.Add(msg,client);
msg = "
欢迎【"+msg+"】光临
";
}
selectChat.AppendText(msg.Replace("
","\r\n"));
sendMsg(String.Empty,msg);
} catch (Exception) {
//MessageBox.Show(ex.Message.ToString());
break;
}
}
}
public void sendMsg(String target,String msg)
{
if(String.Empty!=target)
{
TcpClient client = socketList[target];
StreamWriter sw = new StreamWriter(client.GetStream());
sw.WriteLine(msg);
sw.Flush();
}else{
Dictionary
foreach (String name in keyColl)
{
StreamWriter sw = new StreamWriter(socketList[name].GetStream());
sw.WriteLine(msg+"<@=@>"+charList.ToString());
sw.Flush();
}
}
}
/*根据计算名获取IP地址*/
public String ipAddress()
{
IPAddress[] address = Dns.GetHostAddresses(Dns.GetHostName());
return address[2].ToString();
}
void ServerFromFormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = false;
if(tag)
tag = false;
if(listener!=null)
listener.Stop();
}
void Bu_stopClick(object sender, EventArgs e)
{
bu_Start.Enabled = true;
bu_stop.Enabled = false;
if(tag)
tag = false;
if(listener!=null)
listener.Stop();
}
}
}
Client客户端
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Threading;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
namespace Client
{
public partial class MainForm : Form
{
private System.Windows.Forms.Timer closeWindowTimer;
private StreamReader sr;
private StreamWriter sw;
private TcpClient tc;
private ClientLong cl;
private bool tag = true;
public MainForm(TcpClient tcp,ClientLong clo)
{
cl = clo;
tc = tcp;
InitializeComponent();
Control.CheckForIllegalCrossThreadCalls = false;
bu_simple.Hide();
}
void ClientFromLoad(object sender, EventArgs e)
{
PiayCheckedChanged();
}
/*事件方法*/
public void PiayCheckedChanged()
{
closeWindowTimer = new System.Windows.Forms.Timer();
closeWindowTimer.Interval = 1000;
closeWindowTimer.Tick += new EventHandler(theout);
closeWindowTimer.Start();
}
/*执行的事件*/
public void theout(object source, EventArgs e)
{
//这里单独开一个线程用来显示信息
try{
Thread t1 = new Thread(new ThreadStart(readMsg));
t1.Start();
}catch(Exception)
{
}
}
void readMsg()
{
if(tag && tc!=null){
sr = new StreamReader(tc.GetStream());
String msg = sr.ReadLine();
String[] address = Regex.Split(msg,"<@=@>");
chatText.AppendText(address[0].Replace("
","\r\n"));
address = Regex.Split(address[1],"<@>");
cb_chatList.Items.Clear();
foreach (String s in address)
{
if(!String.IsNullOrEmpty(s) && s != cl.clientName)
cb_chatList.Items.Add(s);
}
}
}
void Button1Click(object sender, EventArgs e)
{
if(String.IsNullOrEmpty(textBox2.Text)){
MessageBox.Show("请输入消息");return;
}
sw = new StreamWriter(tc.GetStream());
sw.WriteLine("
"+cl.clientName+" "+DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")+"
"+textBox2.Text);
textBox2.Text = "";
sw.Flush();
}
void Bu_exitClick(object sender, EventArgs e)
{
MainFormFormClosing(null,null);
}
void Button2Click(object sender, EventArgs e)
{
chatText.Text = "";
}
void MainFormFormClosing(object sender, FormClosingEventArgs e)
{
closeWindowTimer.Stop();
cl.Close();
tag = false;
if(sr!=null)
sr.Close();
if(sw!=null)
sw.Close();
}
void Bu_simpleClick(object sender, EventArgs e)
{
String selected = cb_chatList.Text;
if(selected==null)
{
MessageBox.Show("请选择单聊对象");
return;
}
}
}
}
补充：局域网、校园网安全维护方法
校园网络分为内网和外网，就是说他们可以上学校的内网也可以同时上互联网，大学的学生平时要玩游戏购物，学校本身有自己的服务器需要维护;
在大环境下，首先在校园网之间及其互联网接入处，需要设置防火墙设备，防止外部攻击，并且要经常更新抵御外来攻击;
由于要保护校园网所有用户的安全，我们要安全加固，除了防火墙还要增加如ips，ids等防病毒入侵检测设备对外部数据进行分析检测，确保校园网的安全;
外面做好防护措施，内部同样要做好防护措施，因为有的学生电脑可能带回家或者在外面感染，所以内部核心交换机上要设置vlan隔离，旁挂安全设备对端口进行检测防护;
内网可能有ddos攻击或者arp病毒等传播，所以我们要对服务器或者电脑安装杀毒软件，特别是学校服务器系统等，安全正版安全软件，保护重要电脑的安全;
对服务器本身我们要安全server版系统，经常修复漏洞及更新安全软件，普通电脑一般都是拨号上网，如果有异常上层设备监测一般不影响其他电脑。做好安全防范措施，未雨绸缪。
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