Client communication in a distributed Java application

Svrha rada bila je kreirati distribuiranu aplikaciju uz njenu praktičnu primjenu. Prikazana je i objašnjena izrada REST API servisa pomoću kojeg su se dohvaćali i spremali podaci te njegovo naseljavanja na server. Prikazana je izrada forme pomoću koje se izvršavalo spremanje studenata unutar baze podataka pozivanjem REST servisa. Dokazano je da je HTTP protokol kao podloga REST servisa idealan za ostvarenje komunikacije izmeĎu dva sustava. Objašnjen je način kreiranja POST metode kroz formu kreiranu pomoću HTML-a, te dohvaćanje podataka s REST servisa pomoću GET metode unutar API-a. Prikazana je i objašnjena metoda koja koristi API unutar klijentske aplikacije te način na koji su dohvaćeni podaci pretvoreni iz JSON formata zapisa u objekte korisne klijentskoj Java aplikaciji. Objašnjena je primjena Hibernate ORM-a koji je uvelike olakšao kreiranje baze te njeno povezivanje s klijentskom aplikacijom. Demonstriran je rad klijentske java aplikacije, te je dokazano kako se može primijeniti za bilo koji studentski dom.The purpose of the paper was to create a distributed application with its practical use. It was displayed and explained making of The REST API service by which the data was taken and saved and its population on the server. It is shown making of form which is used to save students inside the database by calling the REST service. It has been proven that the HTTP protocol as a base of REST service is ideal for communication between two systems. It was explained how to create POST methods through a form created using HTML, and fetching data from REST service using the GET method within the API. It was showed and explained the method that uses the API within the client application and the way in which the retrieved data is converted from JSON format records to objects useful for client Java application. It was explained appliance of Hibernate ORM which greatly facilitated the creation of a database and its connection with client applications. It was demonstrated the work of client java applications, and has been proven to be applicable to any student dorm