Learning Network Programming with Java

Creating a simple echo server

We will start with the definition of the SimpleEchoServer class as shown next. In the main method, an initial server message will be displayed:

public class SimpleEchoServer {
    public static void main(String[] args) {
        System.out.println("Simple Echo Server");
        ...
    }
}

The remainder of the method's body consists of a series of try blocks to handle exceptions. In the first try block, a ServerSocket instance is created using 6000 as its parameter. The ServerSocket class is a specialized socket that is used by a server to listen for client requests. Its argument is its port number. The IP of the machine on which the server is located is not necessarily of interest to the server, but the client will ultimately need to know ...