TIL - 21.02.02

[SPRING] 메세지 처리

• MessageUtils : 일관된 메세지 처리를 위해 구현

import org.springframework.context.support.MessageSourceAccessor;

import static com.google.common.base.Preconditions.checkState;

public class MessageUtils {

  private static MessageSourceAccessor messageSourceAccessor;

  public static String getMessage(String key) {
    checkState(null != messageSourceAccessor, "MessageSourceAccessor is not initialized.");
    return messageSourceAccessor.getMessage(key);
  }

  public static String getMessage(String key, Object... params) {
    checkState(null != messageSourceAccessor, "MessageSourceAccessor is not initialized.");
    return messageSourceAccessor.getMessage(key, params);
  }

  public static void setMessageSourceAccessor(MessageSourceAccessor messageSourceAccessor) {
    MessageUtils.messageSourceAccessor = messageSourceAccessor;
  }

}

• messages.properties : 문자열 하드코딩하지 않고 property 사용

error.auth=AuthenticationFailed
error.auth.details=Authentication error (cause: {0})

• Exception 에서 에러메시지 처리

import com.github.prgrms.social.util.MessageUtils;

public class UnauthorizedException extends ServiceRuntimeException {

  public static final String MESSAGE_KEY = "error.auth";

  public static final String MESSAGE_DETAIL = "error.auth.details";

  public UnauthorizedException(String message) {
    super(MESSAGE_KEY, MESSAGE_DETAIL, new Object[]{message});
  }

  @Override
  public String getMessage() {
    return MessageUtils.getMessage(getDetailKey(), getParams());
  }

  @Override
  public String toString() {
    return MessageUtils.getMessage(getMessageKey());
  }

}

REF

• https://whybk.tistory.com/33