10. Networking

Review the presentation Network

Tasks

1. If necessary, change the value of the variable static final int port = 7700 in the class TttNet.java and the value of port in the src/resources/appplication.properties settings file to another number, e.g. 7701
2. Explore the jtm.activity10 package

3. Run the TttCli class in a terminal to see how it works in a terminal using standard input and output:

   java -cp target/classes/ jtm.activity10.TttCli

   and enter the cell numbers.

4. Implement the TttNet class to run it as a server (if the port is available) or a client (a server is already listening on the port).
5. When the class is running as a server:

   1. Run TttNet in one terminal:

      java -cp target/classes/ jtm.activity10.TttNet

   2. Check if the server is listening by running the command in another terminal:

      ss -ntlp|grep 7700

   3. Check how the server part works with the nc program as a client in another terminal:

      nc 127.0.1.1 7700

      and it should work the same as TttCli, with the only difference
      that the data is sent over a network socket.

6. When the TttNet class has a client part implemented, in another terminal:

   java -cp target/classes/ jtm.activity10.TttNet

   it should work the same as TttCli, except that the data is sent over a network socket.

7. If necessary, check all running Java processes with the command:

   ps -efaw|grep java

8. If necessary, you can stop the application with the command:

   kill -9 pid
   where pid is the process ID from the previous command

Additional information (in Latvian)

• Databases
• Networks