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14. Networking
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Table 14-12. The Mapping Between the Java Socket Class and the .NET TcpClient Class
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java.net.Socket bind() close() connect()
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TcpClient N/A Close() Connect()
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Both classes will automatically connect to the server if the host name and port number are provided as arguments to the constructor.
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N/A getChannel() N/A getInetAddress() getLocalAddress() getLocalPort() getLocalSocketAddress() getPort() The NetworkStream class is responsible for both getInputStream() GetStream() input and output. getOutputStream() getKeepAlive() N/A getOOBInline() getReuseAddress() getSoTimeout() getReceiveBufferSize() ReceiveBufferSize setReceiveBufferSize() getSendBufferSize() SendBufferSize setSendBufferSize() getSoLinger() LingerState setSoLinger() getTcpNoDelay() NoDelay setTcpNoDelay() N/A isClosed() This property is protected. isConnected() Active N/A Input is shut down with the Close method. isInputShutdown() isOutputShutdown() shutdownInput() shutdownOutput()
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The System.Net.Sockets.TcpListener class is used to create server applications. Like the TcpClient class, TcpListener provides a simple wrapper around the socket classes and provides a substitute for the java.net.ServerSocket class. Here is a simple TCP server that accepts a single client connection and writes the current time to the server console:
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14. Networking using System; using System.Net.Sockets; using System.IO; namespace SimpleTcpServer { class Server { Server() { TcpListener x_listener = new TcpListener(20172); x_listener.Start(); Console.WriteLine("Waiting for a connection"); TcpClient x_client = x_listener.AcceptTcpClient(); Console.WriteLine("Accepted connection"); StreamWriter x_writer = new StreamWriter(x_client.GetStream()); x_writer.WriteLine("The time is {0}", DateTime.Now.ToShortTimeString()); x_writer.Flush(); Console.WriteLine("Sent time to client"); x_client.Close(); x_listener.Stop(); Console.WriteLine("Finished");
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static void Main(string[] args) { new Server(); } } }
The TcpListener constructor accepts a port number, which will be used to receive client connections. The Start method begins listening for connections, and the class will continue to do so until the Stop method is called. New client connections are accepted using either the AcceptTcpClient or AcceptSocket method. The AcceptTcpClient method returns an instance of TcpClient, discussed in the preceding section. The AcceptSocket method returns an instance of System.Net.Sockets.Socket, which is covered in the "Programming with Native Sockets" section of this chapter.
Note
The Stop method ensures that TcpListener won't accept new client connections but it won't terminate connections already accepted with the AcceptTcpClient and AcceptSocket methods. Socket and TcpClient instances must be closed explicitly before the underlying socket can be released.
Once a connection has been accepted, the resulting type can be used to communicate with the client. These operations can be handed off to threaded delegates, but the process of accepting new connections is synchronous. The Socket class allows connections to be accepted asynchronously; see the "Programming with Native Sockets" section for more details.
14. Networking
Table 14-13 illustrates the System.Net.Sockets.TcpListener.
mapping
between
java.net.ServerSocket
Table 14-13. The Mapping Between the Java ServerSocket Class and the .NET TcpListener Class
Java Class accept()
ServerSocket .NET TcpListener Comments Class AcceptTcpClient() TcpListener won't begin to listen for client connections until the Start method is called. AcceptSocket() N/A bind() N/A Starts listening for client connections. Start() close() Stop() N/A isClosed() N/A getChannel() Returns the EndPoint instance for the LocalEndpoint getInetAddress() TcpListener that contains the address and port details. getPort() getLocalSocketAddress() N/A getReceiveBufferSize() N/A getReuseAddress() getSoTimeout() N/A Pending() Returns true if there are pending client connection requests.
Using UDP
The UdpClient is responsible for handling both point-to-point and multicast messages with the UDP protocol; since UDP is a connectionless protocol, the UdpClient class is used by all endpoints. This provides functionality equivalent to that of the java.net.DatagramSocket and java.net.MulticastSocket classes from the Java API. The UdpClient can be constructed with details of a default host, and the programmer has the choice of supplying host details for each message or using the default by invoking different forms of the Send method. The class provides a Receive method that blocks until a datagram is received. The mapping between the Java DatagramSocket and MulticastSocket classes and the .NET UdpClient class is shown in Table 14-14.
Table 14-14. The Mapping Between the Java DatagramSocket and MulticastSocket Classes and the .NET UdpClient Class
Java DatagramSocket and MulticastSocket .NET Classes Class N/A DatagramSocket.bind() DatagramSocket.isBound() DatagramSocket.close() Close()
UdpClient Comments
14. Networking
DatagramSocket.connect()
Connect()
Binds the UdpClient to a specific host and port.
DatagramSocket.disconnect() DatagramSocket.getChannel() DatagramSocket.getInetAddress() DatagramSocket.getLocalAddress() DatagramSocket.getLocalPort() DatagramSocket.getLocalSocketAddress() DatagramSocket.getReceiveBufferSize() DatagramSocket.getRemoteSocketAddress() DatagramSocket.getReuseAddress() DatagramSocket.getSoTimeout() DatagramSocket.send() DatagramSocket.receive() MulticastSocket.joinGroup() MulticastSocket.leaveGroup()
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