commandserver.java

this is a trade sale system realized by java. It can run some easy functions and has a good design p

package trader.nw;
import java.io.*;
import java.net.*;
import trader.*;
import trader.db.*;

class CommandServer {
  private int port;
  private ServerSocket serverSocket;
  private BrokerModel broker;

  public CommandServer(int port, BrokerModel broker) {
    this.port = port;
    this.broker = broker;
    try {
      serverSocket = new ServerSocket(port);
      System.out.println
        ("CmdServer created ServerSocket on port " + port);
    } catch(Exception e) {
      System.out.println("CmdServer ctor: " + e);
    }
  }

  public void acceptConnection() {
    Socket skt;
    System.out.println("CmdServer.acceptConnection ");
    while(true) {
      try {
        skt = serverSocket.accept(); // listening;
        System.out.println("Connection + accepted");
        service(skt);
      } catch(Exception e) {
        System.out.println("CmdServer.acceptConnection: " + e);
      }
    }
  }

  private void service(Socket socket) {
    InputStream is;
    ObjectInputStream ois;
    OutputStream os;
    ObjectOutputStream oos;
    try {
      is = socket.getInputStream();
      ois = new ObjectInputStream(is);
      os = socket.getOutputStream();
      oos = new ObjectOutputStream(os);
      while (true) {
        Command cmd = (Command) ois.readObject();
        System.out.println("CmdServer.service " + cmd);
        cmd.execute(broker);
        oos.writeObject(cmd);
      }
    } catch(Exception e) {
      e.printStackTrace();
    }
  }

  public static void main(String args[]) {
    String dbHost = "localhost";
    try {
      if (args.length > 0) {
        dbHost = args[0];
      }
      BrokerModel brokerModel = new BrokerModelDbImpl(dbHost);
      CommandServer server = new CommandServer(6001, brokerModel);
      server.acceptConnection();
    } catch(Exception e) {
      e.printStackTrace();
    }
  }
}