tcp-ip-sockets-in-java

My follow-on code from reading the TCP/IP Sockets in Java book

InetAddressExample

A simple example demonstrating the creation of an InetAddress and retrieving the metadata around that connection.

A single argument can be provided with an IP address or a DNS resolvable name.

Example use:

gradle inetaddress --args="192.168.1.1"
gradle inetaddress --args="www.google.com"

Demonstrating a basic TCP echo client using a TCP Socket connection (on port 7 unless specified).

In order for this to work, the client needs to connect to a server; you can do this easily by running the following in a terminal window:

socat -v tcp-l:7,fork exec:'/bin/cat'

You can also use netcat to create the server for this (installed as part of the nmap package:

ncat -e /bin/cat -k -l 7

To test the server from the command-line - in a separate terminal session, run:

echo hello | netcat localhost 7

To run the example:

gradle tcpecho --args="localhost hello"

Demonstrating a basic TCP echo Server using a TCP ServerSocket connection

To run the Server (on TCP Port 7)

gradle tcpechoserver --args="7"

To test with a client, run this in a new terminal tab/window:

echo hello | netcat localhost 7

lsof -i 4tcp:8080 -sTCP:LISTEN