How Do I Open A Socket


  • 3 Jan, 2012

    If you are programming a client, then you would open a socket like this:Socket MyClient;MyClient = new Socket("Machine name", PortNumber);Where Machine name is the machine you are trying to open a connection to, and PortNumber is the port (a number) on which the server you are trying to connect to is running. When selecting a port number, you should note that port numbers between 0 and 1,023 are reserved for privileged users (that is, super user or root). These port numbers are reserved for standard services, such as email, FTP, and HTTP. When selecting a port number for your server, select one that is greater than 1,023!In the example above, we didn't make use of exception handling, however, it is a good idea to handle exceptions. (From now on, all our code will handle exceptions!) The above can be written as:Socket MyClient; try { MyClient = new Socket("Machine name", PortNumber); } catch (IOException e) { System.out.println(e); } If you are programming a server, then this is how you open a socket:ServerSocket MyService; try {MyServerice = new ServerSocket(PortNumber); } catch (IOException e) { System.out.println(e); } When implementing a server you also needto create a socket object from the ServerSocketin order to listen for and accept connectionsfrom clients.Socket clientSocket = null; try { serviceSocket = MyService.accept(); } catch (IOException e) { System.out.println(e); }

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