261. Writing a blocking TCP server/client application

In this problem, we will write a blocking TCP server/client application. More precisely, let’s start with a single-thread blocking TCP echo server.

Writing a single-thread blocking TCP echo server

In order to write a single-thread blocking TCP echo server, we will follow these steps:

1. Create a new server socket channel
2. Configure the blocking mechanism
3. Set the server socket channel options
4. Bind the server socket channel
5. Accept connections
6. Transmit data over a connection
7. Close the channel

So, let’s start with the first step.

Creating a new server socket channel

Creating and opening a new server socket channel (stream-oriented listening socket) can be done via the thread-safe java.nio.channels.ServerSocketChannel API as follows:

ServerSocketChannel serverSC = ServerSocketChannel.open();

The resulting server socket channel is not bound/connected...