面向连接的socket编程
2013-04-18 10:41
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在上一篇中,我列了一些常用的方法,可以说这些方法是一些辅助性的方法,对于分析网络中的主机属性非常有用。在这篇中,我将会介绍一下面向连接(TCP)socket编程,其中辅以实例,代码可供下载。
对于TCP的Socket编程,主要分二部分:
一、服务端Socket侦听:
服务端Socket侦听主要分以下几个步骤,按照以下几个步骤我们可以很方便的建立起一个Socket侦听服务,来侦听尝试连接到该服务器的客户Socket,从而建立起连接进行相关通讯。
1、创建IPEndPoint实例,用于Socket侦听时绑定
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 6001);
2、创建套接字实例
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//创建一个套接字
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
这里创建的时候用ProtocolType.Tcp,表示建立一个面向连接(TCP)的Socket。
3、将所创建的套接字与IPEndPoint绑定
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//将所创建的套接字与IPEndPoint绑定
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
serverSocket.Bind(ipep);
4、设置套接字为收听模式
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//设置套接字为收听模式
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
serverSocket.Listen(10);
以上这四步,我们已经建立了Socket的侦听模式,下面我们就来设置怎么样来获取客户Socket连接的实例,以及连接后的信息发送。
5、在套接字上接收接入的连接
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
while (true)
2
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
3
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
4
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
5
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//在套接字上接收接入的连接
6
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientSocket = serverSocket.Accept();
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientThread = new Thread(new ThreadStart(ReceiveData));
8
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientThread.Start();
9
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
10
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (Exception ex)
11
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
12
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MessageBox.Show("listening Error: " + ex.Message);
13
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
14
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
通过serverSocket.Accept()来接收客户Socket的连接请求,在这里用循环可以实现该线程实时侦听,而不是只侦听一次。当程序运行serverSocket.Accept()时,会等待,直到有客户端Socket发起连接请求时,获取该客户Socket,如上面的clientSocket。在这里我用多线程来实现与多个客户端Socket的连接和通信,一旦接收到一个连接后,就新建一个线程,执行ReceiveData功能来实现信息的发送和接收。
6、 在套接字上接收客户端发送的信息和发送信息
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
private void ReceiveData()
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![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
3
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bool keepalive = true;
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Socket s = clientSocket;
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Byte[] buffer = new Byte[1024];
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
7
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//根据收听到的客户端套接字向客户端发送信息
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
IPEndPoint clientep = (IPEndPoint)s.RemoteEndPoint;
9
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
lstServer.Items.Add("Client:" + clientep.Address + "("+clientep.Port+")");
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string welcome = "Welcome to my test sever ";
11
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
byte[] data = new byte[1024];
12
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
data = Encoding.ASCII.GetBytes(welcome);
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
s.Send(data, data.Length, SocketFlags.None);
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
15
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
while (keepalive)
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![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
17
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//在套接字上接收客户端发送的信息
18
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int bufLen = 0;
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
20
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
21
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bufLen = s.Available;
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
s.Receive(buffer, 0, bufLen, SocketFlags.None);
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (bufLen == 0)
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
continue;
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![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (Exception ex)
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![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
29
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MessageBox.Show("Receive Error:" + ex.Message);
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return;
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![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientep = (IPEndPoint)s.RemoteEndPoint;
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string clientcommand = System.Text.Encoding.ASCII.GetString(buffer).Substring(0, bufLen);
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
lstServer.Items.Add(clientcommand + "("+clientep.Address + ":"+clientep.Port+")");
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![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
37
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
38
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
39
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
通过IPEndPoint clientep = (IPEndPoint)s.RemoteEndPoint;我们可以获取连接上的远程主机的端口和IP地址,如果想查询该主机的其它属性如主机名等,可用于上一篇讲的Dns.GetHostByAddress(string ipAddress)来返回一个IPHostEntry对象,就可以得到。另外我们要注意的是,通过Socket发送信息,必须要先把发送的信息转化成二进字进行传输,收到信息后也要把收到的二进字信息转化成字符形式,这里可以通过Encoding.ASCII.GetBytes(welcome);和Encoding.ASCII.GetString(buffer).Substring(0, bufLen);来实现。
以上就是服务端Socket侦听模式的实现,只要有远程客户端Socket连接上后,就可以轻松的发送信息和接收信息了。下面我们来看看客户端Socket是怎么连接上服务器的。
二、客户端连接
客户端Socket连接相对来说比较简单了,另外说明一下,在执行客户端连接前,服务端Socket侦听必须先启动,不然会提示服务器拒绝连接的信息。
1、创建IPEndPoint实例和套接字
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//创建一个套接字
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 6001);
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
这个跟服务端Socket侦听差不多,下面一步由服务端Socket的侦听模式变成连接模式。
2、将套接字连接到远程服务器
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//将套接字与远程服务器地址相连
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
try
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![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
4
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientSocket.Connect(ipep);
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![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
catch (SocketException ex)
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![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
8
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MessageBox.Show("connect error: " + ex.Message);
9
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return;
10
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
前面已说明,如果在执行Socket连接时,服务器的Socket侦听没有开启的话,会产生一个SocketException异常,如果没有异常发生,那恭喜你,你已经与服务器连接上了,接下来就可以跟服务器通信了。
3、接收信息
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![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
while (true)
2
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
3
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//接收服务器信息
4
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int bufLen = 0;
5
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
6
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
7
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bufLen = clientSocket.Available;
8
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
9
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientSocket.Receive(data, 0, bufLen, SocketFlags.None);
10
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (bufLen == 0)
11
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
12
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
continue;
13
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
14
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
15
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (Exception ex)
16
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
17
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MessageBox.Show("Receive Error:" + ex.Message);
18
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return;
19
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
20
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
21
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string clientcommand = System.Text.Encoding.ASCII.GetString(data).Substring(0, bufLen);
22
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
23
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
lstClient.Items.Add(clientcommand);
24
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
25
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
4、发送信息
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//向服务器发送信息
2
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte[] data = new byte[1024];
4
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
data = Encoding.ASCII.GetBytes(txtClient.Text);
5
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
clientSocket.Send(data, data.Length, SocketFlags.None);
客户端的发送信息和接收信息跟服务器的接收发送是一样的,只不过一个是侦听模式而另一个是连接模式。
以下是程序的运行界面,这些在源码下载里都可以看到:
1、服务端界面:
![](http://images.cnblogs.com/cnblogs_com/licongjie/Server1.jpg)
2、客户端界面:
对于TCP的Socket编程,主要分二部分:
一、服务端Socket侦听:
服务端Socket侦听主要分以下几个步骤,按照以下几个步骤我们可以很方便的建立起一个Socket侦听服务,来侦听尝试连接到该服务器的客户Socket,从而建立起连接进行相关通讯。
1、创建IPEndPoint实例,用于Socket侦听时绑定
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 6001);
2、创建套接字实例
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//创建一个套接字
2
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
这里创建的时候用ProtocolType.Tcp,表示建立一个面向连接(TCP)的Socket。
3、将所创建的套接字与IPEndPoint绑定
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//将所创建的套接字与IPEndPoint绑定
2
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
serverSocket.Bind(ipep);
4、设置套接字为收听模式
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//设置套接字为收听模式
2
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
serverSocket.Listen(10);
以上这四步,我们已经建立了Socket的侦听模式,下面我们就来设置怎么样来获取客户Socket连接的实例,以及连接后的信息发送。
5、在套接字上接收接入的连接
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
while (true)
2
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
3
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
4
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
5
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//在套接字上接收接入的连接
6
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientSocket = serverSocket.Accept();
7
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientThread = new Thread(new ThreadStart(ReceiveData));
8
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientThread.Start();
9
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
10
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (Exception ex)
11
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
12
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MessageBox.Show("listening Error: " + ex.Message);
13
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
14
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
通过serverSocket.Accept()来接收客户Socket的连接请求,在这里用循环可以实现该线程实时侦听,而不是只侦听一次。当程序运行serverSocket.Accept()时,会等待,直到有客户端Socket发起连接请求时,获取该客户Socket,如上面的clientSocket。在这里我用多线程来实现与多个客户端Socket的连接和通信,一旦接收到一个连接后,就新建一个线程,执行ReceiveData功能来实现信息的发送和接收。
6、 在套接字上接收客户端发送的信息和发送信息
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
private void ReceiveData()
2
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
3
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bool keepalive = true;
4
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Socket s = clientSocket;
5
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Byte[] buffer = new Byte[1024];
6
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
7
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//根据收听到的客户端套接字向客户端发送信息
8
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
IPEndPoint clientep = (IPEndPoint)s.RemoteEndPoint;
9
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
lstServer.Items.Add("Client:" + clientep.Address + "("+clientep.Port+")");
10
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string welcome = "Welcome to my test sever ";
11
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
byte[] data = new byte[1024];
12
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
data = Encoding.ASCII.GetBytes(welcome);
13
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
s.Send(data, data.Length, SocketFlags.None);
14
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
15
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
while (keepalive)
16
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
17
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//在套接字上接收客户端发送的信息
18
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int bufLen = 0;
19
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
20
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
21
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bufLen = s.Available;
22
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
23
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
s.Receive(buffer, 0, bufLen, SocketFlags.None);
24
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (bufLen == 0)
25
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
continue;
26
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
27
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (Exception ex)
28
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
29
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MessageBox.Show("Receive Error:" + ex.Message);
30
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return;
31
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
32
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientep = (IPEndPoint)s.RemoteEndPoint;
33
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string clientcommand = System.Text.Encoding.ASCII.GetString(buffer).Substring(0, bufLen);
34
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
35
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
lstServer.Items.Add(clientcommand + "("+clientep.Address + ":"+clientep.Port+")");
36
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
37
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
38
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
39
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
通过IPEndPoint clientep = (IPEndPoint)s.RemoteEndPoint;我们可以获取连接上的远程主机的端口和IP地址,如果想查询该主机的其它属性如主机名等,可用于上一篇讲的Dns.GetHostByAddress(string ipAddress)来返回一个IPHostEntry对象,就可以得到。另外我们要注意的是,通过Socket发送信息,必须要先把发送的信息转化成二进字进行传输,收到信息后也要把收到的二进字信息转化成字符形式,这里可以通过Encoding.ASCII.GetBytes(welcome);和Encoding.ASCII.GetString(buffer).Substring(0, bufLen);来实现。
以上就是服务端Socket侦听模式的实现,只要有远程客户端Socket连接上后,就可以轻松的发送信息和接收信息了。下面我们来看看客户端Socket是怎么连接上服务器的。
二、客户端连接
客户端Socket连接相对来说比较简单了,另外说明一下,在执行客户端连接前,服务端Socket侦听必须先启动,不然会提示服务器拒绝连接的信息。
1、创建IPEndPoint实例和套接字
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//创建一个套接字
2
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 6001);
3
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
这个跟服务端Socket侦听差不多,下面一步由服务端Socket的侦听模式变成连接模式。
2、将套接字连接到远程服务器
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//将套接字与远程服务器地址相连
2
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
try
3
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
4
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientSocket.Connect(ipep);
5
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
6
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
catch (SocketException ex)
7
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
8
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MessageBox.Show("connect error: " + ex.Message);
9
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return;
10
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
前面已说明,如果在执行Socket连接时,服务器的Socket侦听没有开启的话,会产生一个SocketException异常,如果没有异常发生,那恭喜你,你已经与服务器连接上了,接下来就可以跟服务器通信了。
3、接收信息
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
while (true)
2
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
3
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//接收服务器信息
4
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int bufLen = 0;
5
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
6
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
7
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
bufLen = clientSocket.Available;
8
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
9
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
clientSocket.Receive(data, 0, bufLen, SocketFlags.None);
10
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (bufLen == 0)
11
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
12
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
continue;
13
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
14
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
15
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch (Exception ex)
16
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
17
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
MessageBox.Show("Receive Error:" + ex.Message);
18
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return;
19
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
20
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
21
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string clientcommand = System.Text.Encoding.ASCII.GetString(data).Substring(0, bufLen);
22
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
23
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
lstClient.Items.Add(clientcommand);
24
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
25
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
4、发送信息
1
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//向服务器发送信息
2
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte[] data = new byte[1024];
4
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
data = Encoding.ASCII.GetBytes(txtClient.Text);
5
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
clientSocket.Send(data, data.Length, SocketFlags.None);
客户端的发送信息和接收信息跟服务器的接收发送是一样的,只不过一个是侦听模式而另一个是连接模式。
以下是程序的运行界面,这些在源码下载里都可以看到:
1、服务端界面:
![](http://images.cnblogs.com/cnblogs_com/licongjie/Server1.jpg)
2、客户端界面:
![](http://images.cnblogs.com/cnblogs_com/licongjie/Client1.jpg)
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