基于Spring Boot在线学习系统代码

以下是一个简单的基于Spring Boot的在线学习系统的示例代码：

// 学习资源实体类
@Entity
public class LearningResource {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String title;
    private String description;
    // 省略其他属性和方法
}

// 学习资源存储库
@Repository
public interface LearningResourceRepository extends JpaRepository<LearningResource, Long> {
    // 自定义查询方法
    List<LearningResource> findByTitleContaining(String keyword);
}

// 学习资源服务类
@Service
public class LearningResourceService {
    private final LearningResourceRepository learningResourceRepository;

    public LearningResourceService(LearningResourceRepository learningResourceRepository) {
        this.learningResourceRepository = learningResourceRepository;
    }

    public LearningResource getLearningResourceById(Long id) {
        return learningResourceRepository.findById(id).orElse(null);
    }

    public List<LearningResource> searchLearningResources(String keyword) {
        return learningResourceRepository.findByTitleContaining(keyword);
    }

    public void saveLearningResource(LearningResource learningResource) {
        learningResourceRepository.save(learningResource);
    }

    public void deleteLearningResource(Long id) {
        learningResourceRepository.deleteById(id);
    }
}

// 学习资源控制器
@RestController
@RequestMapping("/learning-resources")
public class LearningResourceController {
    private final LearningResourceService learningResourceService;

    public LearningResourceController(LearningResourceService learningResourceService) {
        this.learningResourceService = learningResourceService;
    }

    @GetMapping("/{id}")
    public ResponseEntity<LearningResource> getLearningResourceById(@PathVariable Long id) {
        LearningResource learningResource = learningResourceService.getLearningResourceById(id);
        return ResponseEntity.ok().body(learningResource);
    }

    @GetMapping("/search")
    public ResponseEntity<List<LearningResource>> searchLearningResources(@RequestParam String keyword) {
        List<LearningResource> learningResources = learningResourceService.searchLearningResources(keyword);
        return ResponseEntity.ok().body(learningResources);
    }

    @PostMapping
    public ResponseEntity<?> saveLearningResource(@RequestBody LearningResource learningResource) {
        learningResourceService.saveLearningResource(learningResource);
        return ResponseEntity.ok().build();
    }

    @DeleteMapping("/{id}")
    public ResponseEntity<?> deleteLearningResource(@PathVariable Long id) {
        learningResourceService.deleteLearningResource(id);
        return ResponseEntity.ok().build();
    }
}

// Spring Boot应用程序入口
@SpringBootApplication
public class OnlineLearningSystemApplication {
    public static void main(String[] args) {
        SpringApplication.run(OnlineLearningSystemApplication.class, args);
    }
}

以上代码是一个简单的基于Spring Boot的在线学习系统的示例，包括学习资源实体类、存储库、服务类和控制器等组件。你可以根据实际需求进行修改和扩展。