<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.12.RELEASE</version>
</dependency>
@Autowired的这个注解来进行自动装配@Autowired：自动注入，默认优先按照类型去容器中去找对应的组件：applicationContext.getBean(BookDao.class);如果找到了则进行赋值；如果找到了多个相同类型的组件，再将属性的名称作为组件的id去容器中查找applicationContext.getBean(“bookDao”)//在IOC容器里面默认就是类名的首字母小写
@Repository
public class BookDao {
private String lable = "1";
public String getLable() {
return lable;
}
public void setLable(String lable) {
this.lable = lable;
}
@Override
public String toString() {
return "BookDao{" +
"lable='" + lable + '\'' +
'}';
}
}
@Service
public class BookService {
@Autowired
private BookDao bookDao2;
public void print() {
System.out.println(bookDao2);
}
@Override
public String toString() {
return "BookService{" +
"bookDao=" + bookDao2 +
'}';
}
}
/**
* 自动装配：
* Spring利用依赖注入（DI）完成对IOC容器中各个组件的依赖关系赋值
* 1) @Autowired：自动注入
* (1)默认优先按照类型去容器中去找对应的组件：applicationContext.getBean(BookDao.class);如果找到了则进行赋值；
* public class BookService {
* @Autowired
* BookDao bookDao;
* }
*/
@Configuration
@ComponentScan({"com.ldc.service","com.ldc.dao","com.ldc.controller"})
public class MainConfigOfAutowired {
@Bean("bookDao2")
public BookDao bookDao() {
BookDao bookDao = new BookDao();
bookDao.setLable("2");
return bookDao;
}
}
@Test
public void test01() {
//1.创建IOC容器
AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfigOfAutowired.class);
BookService bookService = applicationContext.getBean(BookService.class);
System.out.println(bookService);
}
BookService{bookDao=BookDao{lable=‘2’}}