spring学习之基于注解的ioc

@component
创建对象和xml配置的bean标签一样
@autowrite
用于注入数据 和bean标签的property一样
@Qualifier
根据component的id获取bean对象

@Autowired
@Qualifier("userMapper")
private UserMapper userMapper;

@Resoure
就是前面两个的结合

@Resource(name = "userMapper")
private UserMapper userMapper;

注入bean

@Component("userService")
public class UserServiceImpl implements UserService {
    
    


    @Autowired
    private UserMapper userMapper;


    @Override
    public void findById() {
    
    
        userMapper.findById();
    }
}

注入字符串
@value

@Value(value = "adb")
private String str;

@Scope
用于改变作用范围
默认是单例singleton

还有bean生命周期注解
@PreDestory 摧毁
@PostConstrast 初始化