Spring framework uses many Design patterns. Some of these

patterns are:

Singleton – By default beans defined in spring config files are

singleton. These are based on Singleton pattern.

Template – This pattern is used in many classes likeJdbcTemplate, RestTemplate, JmsTemplate, JpaTemplate etc.

Dependency Injection – This pattern is the core behind the design of

BeanFactory and ApplicationContext.

Proxy – Aspect Oriented Programming (AOP) heavily uses proxy

design pattern.

Front Controller – DispatcherServlet in Spring is based on Front

Controller pattern to ensure that incoming requests are dispatched to

other controllers.

Factory pattern – To create an instance of an object, BeanFactory is

used. This is based on Factory pattern.

View Helper – Spring has multiple options to separating core code

from presentation in views. Like- Custom JSP tags, Velocity macros

etc

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public class BookRowMapper implements RowMapper<Book> {

​

    @Override

    public Book mapRow(ResultSet rs, int rowNum) throws SQLException {

​

        Book book = new Book();

        book.setId(rs.getLong("id"));

        book.setTitle(rs.getString("title"));

        book.setAuthor(rs.getString("author"));

        return book;

    }

}

https://www.baeldung.com/spring-framework-design-patterns#:~:text=In%20this%20tutorial%2C%20we'll,Proxy%20pattern