载入配置文件来引入 Value 的值

@SuppressWarnings("all")

// 配置当前类为配置类

@Configuration

// 扫描路径，扫描配置为 bean 实例的类

@ComponentScan("com.dkx.spring")

// 加载配置文件配置

@PropertySource("a.properties")

public class SpringConfig {

}

@SuppressWarnings("all")

@Repository("bookDao1")

public class BookDaoImpl implements BookDao {

    @Value("${name}")

    private String name;

    public void save(){

        System.out.println("BookDaoImpl save rning..."+","+name);

    }

}

public void test(){

        ApplicationContext c = new AnnotationConfigApplicationContext(SpringConfig.class);

        BookService service = c.getBean("bookService",BookService.class);

        service.save();

    }