GET REST Calls

Basic GET Calls

Creating a List of Objects for the Demo Purposes

In the DAO Service

@Getter
@Setter
private static final List<User> users = new ArrayList<>();

Get a list of all the users

Utility methods (Later provided by @CrudRepository)

// Retrieve all users
public List<User> findAll() {
    return getUsers();
}

In the Controller

• No need to create an object of the DAOService.
• Use @Autowired annotation to get the object of the DAOService

    @Autowired
    private UserDAOService userDAOService;
  

• Retrieve all users

    @GetMapping(path = "/users")
    public List<User> retrieveAllUsers(){
        return userDAOService.findAll();
    }
  

http://localhost:8089/api/hardCodedData/users

Get a user based on id (from get request parameter)

• In Controller

    //Retrieve specific users
    @GetMapping(path = "/user/{id}")
    public User retrieveUserById(@PathVariable int id){
        return userDAOService.findById(id);
    }
  

• In User DAOService

    // Retrieve users by Id
    public User findById(int id) {
        if(getUsers().get(id) == null) {
            return null;
        }
        return getUsers().get(id);
        }
  

http://localhost:8089/api/hardCodedData/user/1