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UserController.java
@RestController(/v1)

@API(tag=”用戶相關接口”)
public class UserController {
 
    @Autowired
    private UserJPARepository userJPARepository;
    /**
     * 查詢用戶列表
     * @return
     */
    @GetMapping(value = "/user")
    public List<User> findUserList(){
        return userJPARepository.findAll();
    }
    /**
     * 根據Id查詢一個用戶
     * @param id
     * @return
     */
    @GetMapping(value = "/user/query/{id}")
    public User findUserOne(@PathVariable("id") Integer id){
        return userJPARepository.findOne(id);
    }
    /**
     * 添加用戶
     * @param name
     * @param age
     * @param country
     * @return
     */
    @PostMapping(value = "/user")
    public User addUser(@RequestParam("name") String name, @RequestParam("age") int age,
                        @RequestParam("country") String country){
        User user = new User();
        user.setName(name);
        user.setAge(age);
        user.setCountry(country);
        return userJPARepository.save(user);
    }
    /**
     * 刪除用戶
     * @param id  用戶編號
     * @return
     */
    @deleteMapping(value = "/user/{id}")
    public  List<User> deleteUser(@PathVariable("id") Integer id){
        userJPARepository.delete(id);
        return userJPARepository.findAll();
    }
    /**
     * 更新用戶
     * @param id
     * @param name
     * @param age
     * @param country
     * @return
     */
    @PutMapping(value = "/user/{id}")
    public User updateUser(@PathVariable("id") Integer id, @RequestParam("name") String name,
                           @RequestParam("age") int age, @RequestParam("country") String country){
        User user = userJPARepository.findById(id);
        user.setName(name);
        user.setAge(age);
        user.setCountry(country);
        return userJPARepository.save(user);
    }
    /**
     * 根據國家查詢用戶
     * @param country
     * @return
     */
    @GetMapping(value = "/user/{country}")
    public List<User> findByCountry(@PathVariable("country") String country){
        return userJPARepository.findByCountry(country);
    }
}