DelegatingMessageSource.java 文件源码

@Override
public String getMessage(MessageSourceResolvable resolvable, Locale locale) throws NoSuchMessageException {
    if (this.parentMessageSource != null) {
        return this.parentMessageSource.getMessage(resolvable, locale);
    }
    else {
        if (resolvable.getDefaultMessage() != null) {
            return renderDefaultMessage(resolvable.getDefaultMessage(), resolvable.getArguments(), locale);
        }
        String[] codes = resolvable.getCodes();
        String code = (codes != null && codes.length > 0 ? codes[0] : null);
        throw new NoSuchMessageException(code, locale);
    }
}