client-server application that allows clients to store data on the server in JSON format.

• JSON (Gson)
• Sockets
• Multithreading (threads, executors, synchronization, shared data)
• Collections framework (list, set and map interfaces)
• Design patterns (command)
• Reading and writing files
• Input and output streams
• JCommander
• Maven

to build the project

mvn clean package

this should generate two jars in the target folder:

• server-jar-with-dependencies.jar
• client-jar-with-dependencies.jar

first run the server

java -jar target/server-jar-with-dependencies.jar

then run the client with the request args

java -jar target/client-jar-with-dependencies.jar -t set -k "some key" -v "some value"

or with a file containing the request as json, for example a file set.json has the following content:

{
  "type": "set",
  "key": "some key",
  "value": "some value"
}

java -jar target/client-jar-with-dependencies.jar -in set.json

the output should be something like

Sent: {
  "type": "set",
  "key": "some key",
  "value": "some value"
}
Received: {
  "response": "OK"
}