10、IOC容器——Bean管理注解方式(完全注解开发)

完全注解开发

1. 创建配置类，代替xml配置文件

@Configuration      //把当前类作为配置类，代替xml配置文件
@ComponentScan(basePackages = {
    
    "com.demo"})
//等价于<context:component-scan base-package="com.demo.spring5"></context:component-scan>
public class SpringConfig {
    
    
    
}

2. 编写测试类
   不再使用ClassPathXmlApplicationContext(“地址”)了而是使用AnnotationConfigApplicationContext(SpringConfig.class);

  ApplicationContext context=new AnnotationConfigApplicationContext(SpringConfig.class);

public interface UserDao {
    
    
    public void add();
}
@Repository(value = "userDaoImpl1")
public class UserDaoImpl implements UserDao{
    
    
    @Override
    public void add() {
    
    
        System.out.println("若是情短，相思漫长");
    }
}


@Service
public class User {
    
    

    @Resource(name="userDaoImpl1")
    private UserDao userDao;

    @Value(value="abc")
    private String name;

    public void add(){
    
    
        System.out.println("service  add......."+name);
        userDao.add();
    }
}


	@Test
    public void Test01(){
    
    
        ApplicationContext context=new AnnotationConfigApplicationContext(SpringConfig.class);
        User user=context.getBean("user", User.class);
        System.out.println(user);
        user.add();
    }
/**
com.demo.spring5.service.User@3e92efc3
service  add.......abc
若是情短，相思漫长
*/