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Annotation | Description | Example |
---|---|---|
@SpringBootApplication | Marks a class as a Spring Boot application. Enables auto-configuration and component scanning. | @SpringBootApplication |
@RestController | Indicates that a class provides RESTful endpoints. It combines @Controller and @ResponseBody annotations. | @RestController |
@RequestMapping | Maps HTTP requests to handler methods of RESTful controllers. | @RequestMapping("/api") |
@Autowired | Injects dependencies into a Spring bean. It can be used for constructor, setter, or field injection. | @Autowired private MyService myService; |
@Component | Indicates that a class is a Spring-managed component. It is automatically detected during component scanning. | @Component |
@Repository | Marks a class as a Spring Data repository. It handles data access and persistence logic. | @Repository |
@Service | Marks a class as a service component in the business layer. It is used to separate business logic from presentation logic. | @Service |
@Configuration | Indicates that a class provides bean definitions. It is used along with @bean to define beans in Java-based configuration. | @Configuration |
@Value | Injects values from properties files or environment variables into Spring beans. | @Value("${my.property}") private String property; |
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- ???: Spring Boot? ?????? ??? ???? Bean? ?? ???? ?????.
- ???? ??: ????, ???, ???? ?? ????? ?? Spring ??
- ? ??: Spring? ??? ??? ???? ?? ???? ???? ?????.
- ?? ??: ???? HTTP ??? ?? ??? ???? ???? ???? ?????.
- ??: ???? ???? ??? ???? ???? ?? ???? ??? ?????.
- ?? ???: Spring? ??? ?? ?? ??? HTTP ??(?: JSON)?? ?????.
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Spring Boot ?? ??? ?? ??
?? ??? ??? ??????? ???? ? ?? ??? ?????. Spring Boot? ??? ??? ???? ???? ?? ?? ????? ???? ??? ??? ??? ?????.
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- ????? ??: 400 ??? ?? ?? 404 ?? ? ?? ? ??? ????? ???? ?? ??? ?????.
- ?? ??: 500 ?? ?? ?? ? ?? ??? ???? ?????.
- ?? ??: ??? ?? ?? ??? ?? ??? ?? ??
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1. ???? ??
- @ControllerAdvice: Spring MVC?? ?? ?? ???? ???? ? ???? ?????.
- @ExceptionHandler: ???? ?? ??? ?? ??? ???? ? ???? ?????.
- ?:
@ControllerAdvice public class GlobalExceptionHandler { @ExceptionHandler(MyException.class) public ResponseEntity<ErrorResponse> handleMyException(MyException ex) { ErrorResponse response = new ErrorResponse("My error message"); return new ResponseEntity<>(response, HttpStatus.BAD_REQUEST); } @ExceptionHandler(Exception.class) public ResponseEntity<ErrorResponse> handleException(Exception ex) { ErrorResponse response = new ErrorResponse("Internal server error"); return new ResponseEntity<>(response, HttpStatus.INTERNAL_SERVER_ERROR); } }
ResponseEntityExceptionHandler
- ResponseEntityExceptionHandler: ???? Spring MVC ??? ???? ?? ?? ??????.
- ???: handlerMethodArgumentNotValid, handlerHttpMessageNotReadable ?? ?? ???? ??????.
- ?:
@ControllerAdvice public class CustomExceptionHandler extends ResponseEntityExceptionHandler { @Override protected ResponseEntity<Object> handleMethodArgumentNotValid( MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status, WebRequest request) { ErrorResponse response = new ErrorResponse("Validation failed"); return new ResponseEntity<>(response, HttpStatus.BAD_REQUEST); } // Other overrides for handling specific exceptions
3. ?? ??
- ErrorAttributes: ?? ??? ??? ??? ??? ???? ? ???? ????????.
- DefaultErrorAttributes: Spring Boot?? ???? ?? ?????.
@Component public class CustomErrorAttributes extends DefaultErrorAttributes { @Override public Map<String, Object> getErrorAttributes(WebRequest webRequest, boolean includeStackTrace) { Map<String, Object> errorAttributes = super.getErrorAttributes(webRequest, includeStackTrace); errorAttributes.put("customAttribute", "Custom value"); return errorAttributes; } }
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- application.properties: ?? ??, ?????? URL ?? ?? ?????? ?? ??? ?????.
- ??? ?? ?? ??: ??? ??? ?? ??? ?? ?? ??? ?????(?: application-dev.properties).
- ?? ???: @Value ?? ?? Spring? Environment API? ???? ??? ??????.
?? ????
- Maven: mvn clean install? ???? ????? ???? ?? ??? JAR? ?????.
- Gradle: ./gradlew build? ???? ????? ???? ?? ??? JAR? ?????.
?? ??
- Spring Boot Starters: ???? ???? ????? ???? ?? ??? ?????.
- ??: Logback, Log4j ?? Java Util Logging? ???? ??? ?????.
- ?? ??: @ControllerAdvice? ???? ?? ?? ??? ?????.
- ???: JUnit, Mockito ? SpringBootTest? ???? ?? ??? ? ?? ???? ?????.
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