Добавлены контроллеры и DTO

src/main/java/ru/IP_LabWorks/IP/University/Contoller/DTO/GroupDTO.java

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+package ru.IP_LabWorks.IP.University.Contoller.DTO;
+
+import ru.IP_LabWorks.IP.University.Model.Group;
+
+public class GroupDTO {
+    private final long id;
+    private final String name;
+
+    public GroupDTO(Group group){
+        this.id = group.getId();
+        this.name = group.getName();
+    }
+
+    public Long getId(){
+        return id;
+    }
+
+    public String getName(){
+        return name;
+    }
+}

src/main/java/ru/IP_LabWorks/IP/University/Contoller/DTO/StudentDTO.java

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+package ru.IP_LabWorks.IP.University.Contoller.DTO;
+
+import ru.IP_LabWorks.IP.University.Model.Student;
+
+import java.time.LocalDate;
+
+public class StudentDTO {
+    private final long id;
+    private final String name;
+    private final LocalDate birthDate;
+
+    public StudentDTO(Student student) {
+        this.id = student.getId();
+        this.name = student.getName();
+        this.birthDate = student.getBirthDate();
+    }
+
+    public Long getId(){
+        return id;
+    }
+
+    public String getName(){
+        return name;
+    }
+
+    public LocalDate getBirthDate(){
+        return birthDate;
+    }
+}

src/main/java/ru/IP_LabWorks/IP/University/Contoller/DTO/SubjectDTO.java

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+package ru.IP_LabWorks.IP.University.Contoller.DTO;
+
+import ru.IP_LabWorks.IP.University.Model.Subject;
+
+public class SubjectDTO {
+    private final long id;
+    private final String name;
+
+    public SubjectDTO(Subject subject){
+        this.id = subject.getId();
+        this.name = subject.getName();
+    }
+
+    public Long getId(){
+        return id;
+    }
+
+    public String getName(){
+        return name;
+    }
+}

src/main/java/ru/IP_LabWorks/IP/University/Contoller/REST/GroupController.java

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+package ru.IP_LabWorks.IP.University.Contoller.REST;
+
+import org.springframework.web.bind.annotation.*;
+import ru.IP_LabWorks.IP.University.Contoller.DTO.GroupDTO;
+import ru.IP_LabWorks.IP.University.Service.GroupService;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/group")
+public class GroupController {
+    private final GroupService groupService;
+
+    public GroupController(GroupService groupService) {
+        this.groupService = groupService;
+    }
+
+    @GetMapping("/{id}")
+    public GroupDTO getGroup(@PathVariable Long id){
+        return new GroupDTO(groupService.findGroup(id));
+    }
+
+    @GetMapping
+    public List<GroupDTO> getGroups(){
+        return groupService.findAllGroups().stream()
+                .map(GroupDTO::new)
+                .toList();
+    }
+
+    @PostMapping
+    public GroupDTO createGroup(@RequestParam("name") String name){
+        return new GroupDTO(groupService.addGroup(name));
+    }
+
+    @PutMapping("/{id}")
+    public GroupDTO updateGroup(@PathVariable Long id,
+                                @RequestParam("name") String name){
+        return new GroupDTO(groupService.updateGroup(id, name));
+    }
+
+    @DeleteMapping("/{id}")
+    public GroupDTO deleteGroup(@PathVariable Long id){
+        return new GroupDTO(groupService.deleteGroup(id));
+    }
+}

src/main/java/ru/IP_LabWorks/IP/University/Contoller/REST/StudentController.java

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+package ru.IP_LabWorks.IP.University.Contoller.REST;
+
+import org.springframework.web.bind.annotation.*;
+import ru.IP_LabWorks.IP.University.Contoller.DTO.StudentDTO;
+import ru.IP_LabWorks.IP.University.Service.StudentService;
+
+import java.time.LocalDate;
+import java.util.List;
+
+@RestController
+@RequestMapping("/student")
+public class StudentController {
+    private final StudentService studentService;
+
+    public StudentController(StudentService studentService) {
+        this.studentService = studentService;
+    }
+
+    @GetMapping("/{id}")
+    public StudentDTO getStudent(@PathVariable Long id){
+        return new StudentDTO(studentService.findStudent(id));
+    }
+
+    @GetMapping
+    public List<StudentDTO> getStudents(){
+        return studentService.findAllStudents().stream()
+                .map(StudentDTO::new)
+                .toList();
+    }
+
+    @PostMapping
+    public StudentDTO createStudent(@RequestParam("name") String name,
+                                    @RequestParam("birthDate")LocalDate birthDate){
+        return new StudentDTO(studentService.addStudent(name, birthDate));
+    }
+
+    @PutMapping("/{id}")
+    public StudentDTO updateStudent(@PathVariable Long id,
+                                    @RequestParam("name") String name,
+                                    @RequestParam("birthDate") LocalDate birthDate){
+        return new StudentDTO(studentService.updateStudent(id, name, birthDate));
+    }
+
+    @DeleteMapping("/{id}")
+    public StudentDTO deleteStudent(@PathVariable Long id){
+        return new StudentDTO(studentService.deleteStudent(id));
+    }
+
+}

src/main/java/ru/IP_LabWorks/IP/University/Contoller/REST/SubjectController.java

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+package ru.IP_LabWorks.IP.University.Contoller.REST;
+
+import org.springframework.web.bind.annotation.*;
+import ru.IP_LabWorks.IP.University.Contoller.DTO.GroupDTO;
+import ru.IP_LabWorks.IP.University.Contoller.DTO.SubjectDTO;
+import ru.IP_LabWorks.IP.University.Service.GroupService;
+import ru.IP_LabWorks.IP.University.Service.SubjectService;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/subject")
+public class SubjectController {
+    private final SubjectService subjectService;
+
+    public SubjectController(SubjectService subjectService) {
+        this.subjectService = subjectService;
+    }
+
+    @GetMapping("/{id}")
+    public SubjectDTO getSubject(@PathVariable Long id){
+        return new SubjectDTO(subjectService.findSubject(id));
+    }
+
+    @GetMapping
+    public List<SubjectDTO> getSubject(){
+        return subjectService.findAllSubjects().stream()
+                .map(SubjectDTO::new)
+                .toList();
+    }
+
+    @PostMapping
+    public SubjectDTO createSubject(@RequestParam("name") String name){
+        return new SubjectDTO(subjectService.addSubject(name));
+    }
+
+    @PutMapping("/{id}")
+    public SubjectDTO updateSubject(@PathVariable Long id,
+                                    @RequestParam("name") String name){
+        return new SubjectDTO(subjectService.updateSubject(id, name));
+    }
+
+    @DeleteMapping("/{id}")
+    public SubjectDTO deleteSubject(@PathVariable Long id){
+        return new SubjectDTO(subjectService.deleteSubject(id));
+    }
+}

src/main/java/ru/IP_LabWorks/IP/University/Contoller/StudentController.java

@@ -1,9 +0,0 @@
-package ru.IP_LabWorks.IP.University.Contoller;
-
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-@RestController
-@RequestMapping("/student")
-public class StudentController {
-}