先來講述下我自己對於整個Socket通信過程的理解，畢竟初學，說錯見諒，知道錯了會改正~
首先在服務端新建一個serverSocket，對其進行初始化（一般包含AddressFamily:IP地址類型，SocketType:Socket傳輸數據方式，ProtoType:傳輸協議）;
接著我們要設置server端要綁定的IP:port;然後開始監聽，並設置最多同時監聽多少個Client.
這時，服務端就在等待狀態，直到某一個Client連接到這個ip:port上，這時serverSocket.Accept()工作，獲得這個連接。（此時的連接是有地址信息的哦！記得保存）
獲得連接之後，server就可以和這個Client進行通信了,當加入第二個Client（我們稱其為ClientB）時，Server接收到ClientB的消息，可以將這個消息轉發給前一個Client（我們稱其為ClientA），當受到ClientA的消息，也可以轉發給ClientB。這樣就實現了Clients之間的通信了。（重點在保存連接信息！！）
那麼現在貼上代碼講解：
Server端代碼
namespace SocketServer
{
class Program
{
private static byte[] result = new byte[1024];
static Socket serverSocket;
private static string client;
private static Socket clientSocket;
//我這裡存了兩個Client，因為自己電腦開了兩個Client，不會有多的
//理論上應該開一個Socket[]來保存信息，最好用一個二元組將client的信息和連接綁定起來
//這樣就可以實現斷開連接後下次登陸還是可以識別是這個Client
private static Socket clientSocketA=null;
private static Socket clientSocketB=null;
static void Main(string[] args)
{
Program.SetPort(8885);
}
private static void SetPort(int port)
{
IPAddress ip = IPAddress.Parse("127.0.0.1");//set ip
serverSocket = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);//initialize
serverSocket.Bind(new IPEndPoint(ip, port));//bind
serverSocket.Listen(10);
//進入監聽狀態
Console.WriteLine("監聽{0}成功", serverSocket.LocalEndPoint.ToString());
//開啟一個線程來監聽客戶端連接
Thread myThread = new Thread(ListenClientConnect);
myThread.Start();
Console.ReadLine();
}
/// <summary>
/// 監聽客戶端連接
/// </summary>
private static void ListenClientConnect()
{
while (true)
{
//Client連接上後 得到這個連接
clientSocket = serverSocket.Accept();
//這裡我因為只有兩個Client，所以就簡單寫了
if (clientSocketA == null)
{
clientSocketA = clientSocket;
}
else if (clientSocketB == null)
{
clientSocketB = clientSocket;
}
else
{
//當其中一個斷開了，又重新連接時，需要再次保存連接
if (clientSocketB.IsBound)
{
clientSocketA = clientSocketB;
clientSocketB = clientSocket;
}
else
{
clientSocketB = clientSocketA;
clientSocketA = clientSocket;
}
}
clientSocket.Send(Encoding.ASCII.GetBytes("say hello"));
//開個線程接收Client信息
Thread receivedThread = new Thread(ReceiveMessage);
receivedThread.Start(clientSocket);
}
}
private static void ReceiveMessage(object clientSocket)
{
Socket myClientSocket = (Socket) clientSocket;
while (true)
{
try
{
int revceiveNumber = myClientSocket.Receive(result);
//Console.WriteLine("接受客戶端{0}消息{1}", myClientSocket.RemoteEndPoint.ToString()
// , Encoding.ASCII.GetString(result, 0, revceiveNumber));
Console.WriteLine(Encoding.ASCII.GetString(result, 0, revceiveNumber));
if (myClientSocket == clientSocketA)
{
Console.WriteLine("receive from A");
if (clientSocketB!=null&&clientSocketB.IsBound)
{
Console.WriteLine("a IS BOUND");
clientSocketB.Send(result, 0, revceiveNumber, SocketFlags.None);
}
else
{
myClientSocket.Send(Encoding.ASCII.GetBytes("the people is not online! Send Failed!"));
Console.WriteLine("對方不在線上，發送失敗！");
}
}
else
{
Console.WriteLine("receive from B");
if (clientSocketA != null && clientSocketA.IsBound)
{
Console.WriteLine("a IS BOUND");
clientSocketA.Send(result, 0, revceiveNumber, SocketFlags.None);
}
else
{
myClientSocket.Send(Encoding.ASCII.GetBytes("the people is not online! Send Failed!"));
Console.WriteLine("對方不在線上，發送失敗！");
}
}
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
myClientSocket.Shutdown(SocketShutdown.Both);
myClientSocket.Close();
break;
}
}
}
}
}
Client端代碼(因為都差不多 就只貼一個了)
namespace SocketClient
{
class Program
{
private static byte[] result = new byte[1024];
private static Socket clientSocket;
private static void ListenServer()
{
while (true)
{
result = new byte[1024];
int receiveLength = clientSocket.Receive(result);
Console.WriteLine("{0}", Encoding.ASCII.GetString(result, 0, receiveLength));
}
}
static void Main(string[] args)
{
IPAddress ip = IPAddress.Parse("127.0.0.1");
clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
clientSocket.Connect(ip, 8885);
Console.WriteLine("連接成功！");
}
catch (Exception e)
{
Console.WriteLine("連接失敗！");
return;
}
Thread threadRead = new Thread(ListenServer);
threadRead.Start();
while(true)
{
try
{
Thread.Sleep(1000);
string sendMessage = Console.ReadLine();
clientSocket.Send(Encoding.ASCII.GetBytes("Sylvia:"+sendMessage));
}
catch (Exception ex)
{
clientSocket.Shutdown(SocketShutdown.Both);
clientSocket.Close();
break;
}
}
Console.WriteLine("發送完畢 按回車退出");
Console.ReadKey();
}
}
}
寫的時候要特別注意一下Send信息的時候，注意byte[]的傳輸大小，很容易變成byte[]數組的大小而不是內容的大小。
這個大家就自己嘗試吧。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。
