Spring注解大揭秘：常用注解解析

@Autowired
private UserService userService;

@Component
public class UserService {
    // 业务逻辑代码
}

@Controller
public class UserController {
    // 处理请求的代码
}

@Service
public class UserService {
    // 业务逻辑代码
}

@Repository
public class UserRepository {
    // 数据访问方法
}

@Controller
@RequestMapping("/user")
public class UserController {
    @RequestMapping("/login")
    public String login() {
        // 处理登录请求
    }
}

@Controller
@RequestMapping("/user")
public class UserController {
    @RequestMapping("/profile/{id}")
    public String viewProfile(@PathVariable("id") int id) {
        // 根据id查询用户信息
    }
}

@Controller
@RequestMapping("/user")
public class UserController {
    @RequestMapping("/profile")
    public String viewProfile(@RequestParam("id") int id) {
        // 根据id查询用户信息
    }
}

@Controller
@RequestMapping("/user")
public class UserController {
    @RequestMapping("/profile/{id}")
    @ResponseBody
    public User viewProfile(@PathVariable("id") int id) {
        // 根据id查询用户信息
        return userService.getUserById(id);
    }
}

@Service
public class UserService {
    @Transactional
    public void updateUser(User user) {
        // 更新用户信息的操作
    }
}