Netbus 2 0 Server And Client Java

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This section shows you how to write a server and the client that goes with it. The server in the client/server pair serves up Knock Knock jokes. Knock Knock jokes are favored by children and are usually vehicles for bad puns. They go like this: Server: 'Knock knock!' Client: 'Who's there?' Server: 'Dexter.'

Client: 'Dexter who?' Server: 'Dexter halls with boughs of holly.' Client: 'Groan.' The example consists of two independently running Java programs: the client program and the server program. The client program is implemented by a single class,, and is very similar to the example from the previous section.

The server program is implemented by two classes: and. KnockKnockServer, which is similar to, contains the main method for the server program and performs the work of listening to the port, establishing connections, and reading from and writing to the socket. The class serves up the jokes. It keeps track of the current joke, the current state (sent knock knock, sent clue, and so on), and returns the various text pieces of the joke depending on the current state.

This object implements the protocol—the language that the client and server have agreed to use to communicate. The following section looks in detail at each class in both the client and the server and then shows you how to run them. The Knock Knock Server This section walks through the code that implements the Knock Knock server program,. The server program begins by creating a new object to listen on a specific port (see the statement in bold in the following code segment). When running this server, choose a port that is not already dedicated to some other service. For example, this command starts the server program KnockKnockServer so that it listens on port 4444.

Int portNumber = Integer.parseInt(args[0]); try ( ServerSocket serverSocket = new ServerSocket(portNumber); Socket clientSocket = serverSocket.accept(); PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true); BufferedReader in = new BufferedReader( new InputStreamReader(clientSocket.getInputStream())); ) { ServerSocket is a class that provides a system-independent implementation of the server side of a client/server socket connection. The constructor for ServerSocket throws an exception if it can't listen on the specified port (for example, the port is already being used). In this case, the KnockKnockServer has no choice but to exit. If the server successfully binds to its port, then the ServerSocket object is successfully created and the server continues to the next step—accepting a connection from a client (the next statement in the try-with-resources statement). ClientSocket = serverSocket.accept(); The method waits until a client starts up and requests a connection on the host and port of this server.

(Let's assume that you ran the server program KnockKnockServer on the computer named knockknockserver.example.com.) In this example, the server is running on the port number specified by the first command-line argument. When a connection is requested and successfully established, the accept method returns a new object which is bound to the same local port and has its remote address and remote port set to that of the client.

The server can communicate with the client over this new Socket and continue to listen for client connection requests on the original ServerSocket This particular version of the program doesn't listen for more client connection requests. However, a modified version of the program is provided in. After the server successfully establishes a connection with a client, it communicates with the client using this code.

String hostName = args[0]; int portNumber = Integer.parseInt(args[1]); try ( Socket kkSocket = new Socket(hostName, portNumber); PrintWriter out = new PrintWriter(kkSocket.getOutputStream(), true); BufferedReader in = new BufferedReader( new InputStreamReader(kkSocket.getInputStream())); ) When creating its socket, the KnockKnockClient example uses the host name of the first command-line argument, the name of the computer on your network that is running the server program KnockKnockServer. The KnockKnockClient example uses the second command-line argument as the port number when creating its socket. This is a remote port number—the number of a port on the server computer—and is the port to which KnockKnockServer is listening. For example, the following command runs the KnockKnockClient example with knockknockserver.example.com as the name of the computer that is running the server program KnockKnockServer and 4444 as the remote port number. Java KnockKnockClient knockknockserver.example.com 4444 The client's socket is bound to any available local port—a port on the client computer. Remember that the server gets a new socket as well. If you run the KnockKnockClient example with the command-line arguments in the previous example, then this socket is bound to local port number 4444 on the computer from which you ran the KnockKnockClient example.