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替代繁琐XML，让配置更简洁

XML 配置文件多、结构复杂、维护麻烦； 注解写在代码旁边，简洁直观，大幅减少配置量。

传统XML方式

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<!-- applicationContext.xml -->
<bean id="userService" class="com.example.service.UserService">
    <property name="userMapper" ref="userMapper"/>
</bean>

<bean id="userMapper" class="com.example.mapper.UserMapper">
</bean>

注解方式

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;
}