前言：

欢迎来到探索Spring注解的奇妙之旅！在这篇博客中，我们将深入研究Spring框架中最常用的30个注解，揭示它们的作用和用法，助你更好地掌握Spring的强大功能。

Spring作为一个广泛应用的Java框架，注解是其核心特性之一，为开发人员提供了便捷、灵活的方式来配置和管理应用。无论你是初学者还是有一定经验的开发者，这篇博客都将为你解密Spring注解的奥秘，为你提供实用而有深度的注解应用技巧。

让我们一同踏上Spring注解之旅，深入了解这些神奇的注解，为你的Spring应用增色不少。祝你在这趟注解之旅中有所收获，希望这篇博客成为你学习Spring注解的得力指南！ 🌼🌐

1-10 Spring常用注解解析

1. @Autowired - 自动注入

   @Autowired
   private MyService myService;
   

2. @Controller - 控制器

   @Controller
   public class MyController {// Controller code
   }
   

3. @Service - 服务层

   @Service
   public class MyService {// Service code
   }
   

4. @Repository - 数据仓库

   @Repository
   public class MyRepository {// Repository code
   }
   

5. @RequestMapping - 请求映射

   @Controller
   @RequestMapping("/my")
   public class MyController {// Controller code
   }
   

6. @GetMapping - GET请求映射

   @Controller
   @RequestMapping("/my")
   public class MyController {@GetMapping("/info")public String getInfo() {// Method code}
   }
   

7. @PostMapping - POST请求映射

   @Controller
   @RequestMapping("/my")
   public class MyController {@PostMapping("/create")public String create() {// Method code}
   }
   

8. @PathVariable - 路径变量

   @Controller
   @RequestMapping("/my")
   public class MyController {@GetMapping("/info/{id}")public String getInfo(@PathVariable Long id) {// Method code}
   }
   

9. @RequestParam - 请求参数

   @Controller
   @RequestMapping("/my")
   public class MyController {@GetMapping("/info")public String getInfo(@RequestParam String name) {// Method code}
   }
   

10. @ResponseBody - 返回JSON格式数据

    @Controller
    @RequestMapping("/my")
    public class MyController {@GetMapping("/info")@ResponseBodypublic Map<String, String> getInfo() {// Method code}
    

11-20 Spring进阶注解深度解析

11. @Configuration - 配置类

    @Configuration
    public class AppConfig {// Configuration code
    }
    

12. @Bean - 定义Bean

    @Configuration
    public class AppConfig {@Beanpublic MyService myService() {return new MyServiceImpl();}
    }
    

13. @ComponentScan - 组件扫描

    @Configuration
    @ComponentScan("com.example")
    public class AppConfig {// Configuration code
    }
    

14. @Value - 注入属性值

    @Component
    public class MyComponent {@Value("${my.property}")private String property;
    }
    

15. @Qualifier - 限定符注入

    @Autowired
    @Qualifier("myServiceImpl")
    private MyService myService;
    

16. @Profile - 环境配置

    @Configuration
    @Profile("dev")
    public class DevConfig {// Dev configuration code
    }
    

17. @Scope - Bean作用域

    @Component
    @Scope("prototype")
    public class MyComponent {// Component code
    }
    

18. @Lazy - 懒加载

    @Component
    @Lazy
    public class MyComponent {// Component code
    }
    

19. @Async - 异步方法

    @Service
    public class MyService {@Asyncpublic void asyncMethod() {// Async method code}
    }
    

20. @Scheduled - 定时任务

    @Service
    public class MyService {@Scheduled(fixedRate = 5000)public void scheduledMethod() {// Scheduled method code}
    }
    

21-30 Spring进阶注解深度解析

21. @Transaction - 事务管理

    @Service
    public class MyService {@Transactionalpublic void performTransaction() {// Transactional method code}
    }
    

22. @Cacheable - 缓存数据

    @Service
    public class MyService {@Cacheable("myCache")public String getCachedData() {// Cached data retrieval code}
    }
    

23. @CacheEvict - 清除缓存

    @Service
    public class MyService {@CacheEvict("myCache")public void clearCache() {// Cache clearing code}
    }
    

24. @Validated - 参数验证

    @RestController
    public class MyController {@PostMapping("/validate")public ResponseEntity<String> validateData(@RequestBody @Validated MyDto myDto) {// Validation code}
    }
    

25. @ExceptionHandler - 异常处理

    @ControllerAdvice
    public class GlobalExceptionHandler {@ExceptionHandler(MyException.class)public ResponseEntity<String> handleMyException(MyException ex) {// Exception handling code}
    }
    

26. @ModelAttribute - 模型属性

    @Controller
    public class MyController {@ModelAttribute("myData")public MyData prepareData() {// Model attribute preparation code}
    }
    

27. @CookieValue - 获取Cookie值

    @Controller
    public class MyController {@GetMapping("/getCookie")public String getCookieValue(@CookieValue(name = "myCookie") String cookieValue) {// Cookie value retrieval code}
    }
    

28. @RequestHeader - 获取请求头

    @Controller
    public class MyController {@GetMapping("/getHeader")public String getHeaderValue(@RequestHeader("myHeader") String headerValue) {// Header value retrieval code}
    }
    

29. @ResponseStatus - 设置响应状态

    @RestController
    public class MyController {@ResponseStatus(HttpStatus.CREATED)@PostMapping("/createResource")public void createResource() {// Resource creation code}
    }
    

30. @PropertySource - 加载属性文件

    @Configuration
    @PropertySource("classpath:my.properties")
    public class MyConfig {// Configuration code
    }
    

结语

感谢你的持续关注，希望这30个Spring注解能够为你的Spring项目开发提供更多便利和灵活性。Spring注解的丰富功能，让开发变得更加高效、简洁。

期待下次与你一同探讨更多的Spring框架知识，愿你在Spring的世界中越走越远，创造出更加出色的应用！ 🌺📚