1.源码克隆：git clone https://github.com/spring-guides/gs-caching.git
2.包含两个项目initial和complete，initial可以根据文档练习完善，complete是完整项目
3.功能描述：构建应用程序，在图书存储库上启用缓存，获取同一本书的第二次和后续时间要快得多

源码分析

1.POM依赖
<dependencies>
	<!--https://blog.csdn.net/tongxin_tongmeng/article/details/128579882-->
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-cache</artifactId>
	</dependency>

	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-test</artifactId>
		<scope>test</scope>
	</dependency>
</dependencies>

2.入口类
// https://blog.csdn.net/tongxin_tongmeng/article/details/128401278
@SpringBootApplication
@EnableCaching
public class CachingApplication {

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

}

3.图书获取
@Component
public class SimpleBookRepository implements BookRepository {

	@Override
	@Cacheable("books")
	public Book getByIsbn(String isbn) {
		simulateSlowService();
		return new Book(isbn, "Some book");
	}

	// Don't do this at home
	private void simulateSlowService() {
		try {
			long time = 3000L;
			Thread.sleep(time);
		} catch (InterruptedException e) {
			throw new IllegalStateException(e);
		}
	}

}

4.测试类
@Component
// https://blog.csdn.net/tongxin_tongmeng/article/details/128402169
public class AppRunner implements CommandLineRunner {

	private static final Logger logger = LoggerFactory.getLogger(AppRunner.class);

	private final BookRepository bookRepository;

	public AppRunner(BookRepository bookRepository) {
		this.bookRepository = bookRepository;
	}

	@Override
	public void run(String... args) throws Exception {
		logger.info(".... Fetching books");
		logger.info("isbn-1234 -->" + bookRepository.getByIsbn("isbn-1234"));
		logger.info("isbn-4567 -->" + bookRepository.getByIsbn("isbn-4567"));
		logger.info("isbn-1234 -->" + bookRepository.getByIsbn("isbn-1234"));
		logger.info("isbn-4567 -->" + bookRepository.getByIsbn("isbn-4567"));
		logger.info("isbn-1234 -->" + bookRepository.getByIsbn("isbn-1234"));
		logger.info("isbn-1234 -->" + bookRepository.getByIsbn("isbn-1234"));
	}

}