用TCP/IP实现自己简单的应用程序协议:其余部分（包括完整代码)

public class VoteClientTCP {

public static int CANDIDATEID = 888;//随便写了一个

public static void Main(String[] args) {

int port = 5555;
IPEndPoint ipep = new IPEndPoint(GetLocalhostIPv4Addresses().First(), port);

Socket sock = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
try
{
sock.Connect(ipep);
}
catch (SocketException e)
{
Console.WriteLine("Can not connect {0} ,reason：{1}，NativeErrorCode：{2},SocketErrorCode:{3}", ipep.Address, e.Message, e.NativeErrorCode, e.SocketErrorCode);
Console.ReadKey();
return;
}

IVoteMsgCoder coder = new VoteMsgTextCoder();

IFramer framer = new LengthFramer(sock);

VoteMsg msg = new VoteMsg(true, false, CANDIDATEID, 1);
byte[] encodedMsg = coder.toWire(msg);

// 发送查询
Console.WriteLine("Sending Inquiry (" + encodedMsg.Length + " bytes): ");
framer.frameMsg(encodedMsg);

// 投第一票给候选人888
msg.IsInquiry = false;
encodedMsg = coder.toWire(msg);
Console.WriteLine("Sending Vote (" + encodedMsg.Length + " bytes): ");
framer.frameMsg(encodedMsg);

// 投第二票给候选人888
msg.IsInquiry = false;
encodedMsg = coder.toWire(msg);
Console.WriteLine("Sending Vote (" + encodedMsg.Length + " bytes): ");
framer.frameMsg(encodedMsg);

// 再次查询
msg.IsInquiry = true;
encodedMsg = coder.toWire(msg);
Console.WriteLine("Sending Inquiry (" + encodedMsg.Length + " bytes): ");
framer.frameMsg(encodedMsg);

encodedMsg = framer.nextMsg();
msg = coder.fromWire(encodedMsg);
Console.WriteLine("Received Response (" + encodedMsg.Length
+ " bytes): ");
Console.WriteLine(msg);

msg = coder.fromWire(framer.nextMsg());
Console.WriteLine("Received Response (" + encodedMsg.Length
+ " bytes): ");
Console.WriteLine(msg);

msg = coder.fromWire(framer.nextMsg());
Console.WriteLine("Received Response (" + encodedMsg.Length
+ " bytes): ");
Console.WriteLine(msg);

msg = coder.fromWire(framer.nextMsg());
Console.WriteLine("Received Response (" + encodedMsg.Length
+ " bytes): ");
Console.WriteLine(msg);

sock.Shutdown(SocketShutdown.Both);
sock.Close();
Console.ReadLine();
}

　　　　//辅助方法
public static IPAddress[] GetLocalhostIPv4Addresses()
{
IPHostEntry hostEntry = Dns.GetHostEntry(Dns.GetHostName());
List<IPAddress> list = new List<IPAddress>();
foreach (IPAddress address in hostEntry.AddressList)
{
if (address.AddressFamily == AddressFamily.InterNetwork)
{
list.Add(address);
}
}
return list.ToArray();
}

}

public class VoteServerTCP {

public static void Main(String[] args){

int port = 5555;

Socket servSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );;
//编码对象
IVoteMsgCoder coder = new VoteMsgTextCoder();
//服务对象
VoteService service = new VoteService();
//创建IP终结点
IPAddress localAddress = AddressHelper.GetLocalhostIPv4Addresses().First();
IPEndPoint ipep = new IPEndPoint(localAddress, port);

servSock.Bind(ipep);
servSock.Listen(1);

while (true) {
Socket clntSock = servSock.Accept();
Console.WriteLine("Handling client at " + clntSock.AddressFamily);

IFramer framer = new LengthFramer(clntSock);
try {
byte[] req;
while ((req = framer.nextMsg()) != null) {
Console.WriteLine("Received message (" + req.Length + " bytes)");
VoteMsg responseMsg = service.handleRequest(coder.fromWire(req));
//发回反馈消息
framer.frameMsg(coder.toWire(responseMsg));
}
} catch (SocketException soe) {
//比如说客户端提发送多条消息，又在全部接收前关闭socket时就会引发此类异常。
Console.WriteLine("Error handling client: " + soe.Message);
} finally {
Console.WriteLine("Closing connection");
clntSock.Close();
}
}
}
}

public class VoteMsgTextCoder : IVoteMsgCoder
{
// 下面是需要进行编码的字段
public static readonly String MAGIC = "Voting";
public static readonly String VOTESTR = "v";
public static readonly String INQSTR = "i";
public static readonly String RESPONSESTR = "R";

public static readonly String DELIMSTR = " ";
UTF8Encoding encoder = null;

public static readonly int MAX_WIRE_LENGTH = 2000;

public VoteMsgTextCoder()
{
encoder = new UTF8Encoding();
}

public byte[] toWire(VoteMsg msg)
{
String msgString = MAGIC + DELIMSTR + (msg.IsInquiry ? INQSTR : VOTESTR)
+ DELIMSTR + (msg.IsResponse ? RESPONSESTR + DELIMSTR : "")
+ msg.CandidateID.ToString() + DELIMSTR
+ msg.VoteCount.ToString();
byte[] data = encoder.GetBytes(msgString);
return data;
}

public VoteMsg fromWire(byte[] message)
{

bool isInquiry;
bool isResponse;
int candidateID;
long voteCount;
string token;

string StringSentByClient = Encoding.UTF8.GetString(message);
string[] fields = StringSentByClient.Split(new char[] { ' ' });

try
{
token = fields[0];
if (!token.Equals(MAGIC))
{
throw new IOException("Bad magic string: " + token);
}
token = fields[1];
if (token.Equals(VOTESTR))
{
isInquiry = false;
}
else if (!token.Equals(INQSTR))
{
throw new IOException("Bad vote/inq indicator: " + token);
}
else
{
isInquiry = true;
}

token = fields[2];
if (token.Equals(RESPONSESTR))
{
isResponse = true;
token = fields[3];
}
else
{
isResponse = false;
}

candidateID = int.Parse(token);
if (isResponse)
{
token = fields[4];
voteCount = long.Parse(token);
}
else
{
voteCount = 0;
}
}
catch (IOException ioe)
{
throw new IOException("Parse error...");
}

return new VoteMsg(isInquiry, isResponse, candidateID, voteCount);

}
}