spring-知识小结之注解为属性赋值

public class UserServiceImpl implements UserService {
        
       //按照类别赋值
       // @Autowired  
     
        //按照名称赋值
       // @Autowired
       // @Qualifier("userDao")
	
       //按照名字赋值
	@Resource
	private UserDao userDao;

	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
}    
public class UserServiceImpl