我有個問題。當(dāng)我有其他實體時，我不知道如何創(chuàng)建 API。我與 Postman 合作，當(dāng)我請求查看數(shù)據(jù)庫中的所有項目時，我也想接收實體。例如，這是我的實體：@Entity@Table(name = "project")public class Project {    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)    @Column(name = "proj_id")    private int projectId;    @Column(name = "project_name")    private String projectName;    @Column(name = "dg_number")    private int dgNumber;    @ManyToMany    @JoinTable(name = "project_gate_relation", joinColumns = @JoinColumn(name = "proj_id"), inverseJoinColumns = @JoinColumn(name = "gate_id"))    @JsonBackReference    private  List<Gate> gates;    @ManyToMany    @JoinTable(name = "project_threshold_relation", joinColumns = @JoinColumn(name = "proj_id"), inverseJoinColumns = @JoinColumn(name = "thresholdgates_id"))    @JsonBackReference    private  List<Threshold> thresholds;這是門實體@Entity@Table(name = "gate")public class Gate {    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)    @Column(name = "gate_id")    private int gateId;    @Column(name = "gate_type")    private String gateType;    @Column(name = "gate_value")    private float value;閾值實體@Entity@Table(name = "threshold")public class Threshold {    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)    @Column(name = "threshold_id")    private int thresholdId;    @Column(name = "threshold_value")    private int thresholdValue;    @Column(name = "threshold_type")    private String thresholdType;控制器@RestController@RequestMapping(ProjectController.PROJECT_URL)public class ProjectController {    public static final String PROJECT_URL = "/cidashboard/projects";    @Autowired    private final ProjectService projectService;    public ProjectController(ProjectService projectService) {        this.projectService = projectService;    }    @GetMapping    public List<Project> getAllProjects(){        return projectService.findAllProjects();    }    @GetMapping("/{id}")    public Project getProjectById(@PathVariable int id) {        return projectService.findProjectById(id);    }