Spring Boot 常用注解大全

@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

@RestController
public class HelloController {
    @GetMapping("/hello")
    public String hello() {
        return "Hello, World!";
    }
}

@Service
public class UserService {
    // Service logic here
}

@Repository
public class UserRepository {
    // Data access logic here
}

@Component
public class MyComponent {
    // Component logic here
}

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;

    // Service logic here
}

@Service
public class UserService {
    @Autowired
    @Qualifier("userDatabaseRepository")
    private UserRepository userRepository;

    // Service logic here
}

@RestController
@RequestMapping("/api")
public class MyController {
    @GetMapping("/hello")
    public String hello() {
        return "Hello, World!";
    }
}

@RestController
@RequestMapping("/api")
public class MyController {
    @GetMapping("/get")
    public String get() {
        return "GET Request";
    }

    @PostMapping("/post")
    public String post() {
        return "POST Request";
    }

    @PutMapping("/put")
    public String put() {
        return "PUT Request";
    }

    @DeleteMapping("/delete")
    public String delete() {
        return "DELETE Request";
    }
}

@GetMapping("/user")
public String getUserById(@RequestParam Long id) {
    // logic to fetch user by id
}

@GetMapping("/user/{id}")
public String getUserById(@PathVariable Long id) {
    // logic to fetch user by id
}

@GetMapping("/user")
@ResponseBody
public User getUser() {
    // logic to fetch user
    return user;
}

@PostMapping("/user")
public String addUser(@RequestBody User user) {
    // logic to add user
}

@ResponseStatus(HttpStatus.NOT_FOUND)
public class ResourceNotFoundException extends RuntimeException {
    // Exception handling logic here
}

@ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(Exception.class)
    public String handleException(Exception ex) {
        // Exception handling logic here
        return "error";
    }
}

@Configuration
public class AppConfig {
    @Bean
    public UserService userService() {
        return new UserService();
    }
}

@Component
public class MyComponent {
    @Value("${my.property}")
    private String myProperty;

    // Component logic here
}