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身为Java后端,连Spring都理不顺那可就太水

  • 2025-12-04 13:20:07
身为Java后端,连Spring都理不顺那可就太水

身为Java后端,连Spring都理不顺那可就太水

去年秋招以来面试了不下十家公司的后端岗位,最终斩获了两个offer。我发现很多问题看似基础,却能直接暴露对Spring框架的理解深度。答得好,能让面试官觉得你确实做过项目、有思考。

今天就把几个高频Spring问题和高分回答分享给大家👇

1⃣ 谈谈你对IoC和AOP的理解
❌ 扣分回答:IoC是控制反转,AOP是面向切面,都是Spring的核心。
✅ 我的回答:IoC的本质是将对象的创建和依赖关系的控制权交给容器。比如以前我们需要自己new一个Service,现在用@Autowired注解就能自动注入,实现了代码的解耦。而AOP像是“插桩”,通过动态代理把日志、事务这些横切逻辑无侵入地织入业务方法中,让核心代码更纯粹。

2⃣ Spring事务失效的场景你遇到过哪些?
❌ 扣分回答:不太清楚,我平时直接用@Transactional。
✅ 我的回答:我总结过几种常见场景。比如在同一个类中,一个非事务方法调用另一个有@Transactional的方法会失效,因为代理机制无法生效;还有如果方法抛出的异常不是RuntimeException,但注解又没配置rollbackFor,也不会回滚。

3⃣ Bean的生命周期能简单说下吗?
❌ 扣分回答:就是创建、初始化、销毁。
✅ 我的回答:我理解为几个关键节点:实例化、属性赋值、处理Aware接口、BeanPostProcessor的前后置处理、初始化方法、以及容器关闭时的销毁流程。像我们项目中需要读取配置的Bean,就是通过InitializingBean接口在属性赋值后完成初始化的。

4⃣ Spring怎么解决循环依赖?
❌ 扣分回答:用三级缓存,但具体说不清。
✅ 我的回答:Spring通过三级缓存处理单例Bean的循环依赖。一级存完整Bean,二级存早期暴露的对象,三级存Bean工厂。当A创建时被提前曝光到二级缓存,B需要注入A时就能拿到这个“半成品”,等B创建完再补全A的依赖,从而解决循环引用。但构造函数循环依赖是无解的。

5⃣ 你了解Spring中的设计模式吗?举例说明
❌ 扣分回答:好像有工厂模式和单例模式。
✅ 我的回答:比如BeanFactory是典型的工厂模式;Bean默认是单例;@EventListener用了观察者模式;而像JdbcTemplate这类模板方法模式,固定了流程,我们只需实现变化部分。还有适配器模式,比如SpringMVC的HandlerAdapter就用来适配不同的Controller类型。
#java #编程 #计算机专业 #后端开发 #程序员的出路 #前端后端开发 #java学习 #java面试

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  1. CONNECT:[ UseTime:0.000400s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000512s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000674s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000257s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000480s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000487s ]
  8. SELECT * FROM `article` WHERE `id` = 457276 LIMIT 1 [ RunTime:0.001392s ]
  9. UPDATE `article` SET `lasttime` = 1765115062 WHERE `id` = 457276 [ RunTime:0.114473s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000297s ]
  11. SELECT * FROM `article` WHERE `id` < 457276 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000470s ]
  12. SELECT * FROM `article` WHERE `id` > 457276 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001471s ]
  13. SELECT * FROM `article` WHERE `id` < 457276 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006100s ]
  14. SELECT * FROM `article` WHERE `id` < 457276 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002378s ]
  15. SELECT * FROM `article` WHERE `id` < 457276 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001797s ]
0.200804s