ResponseMessageDto.java

package com.codepuran.dto;

import java.util.List;

public class ResponseMessageDto {

  private Integer port;
  private List<Student> students;

  public Integer getPort() {
    return port;
  }

  public void setPort(Integer port) {
    this.port = port;
  }

  public List<Student> getStudents() {
    return students;
  }

  public void setStudents(List<Student> students) {
    this.students = students;
  }

  public ResponseMessageDto(Integer port, List<Student> students) {
    super();
    this.port = port;
    this.students = students;
  }
}

Student.java

package com.codepuran.dto;

public class Student {
  private Long id;
  private String name;

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public Student(Long id, String name) {
    super();
    this.id = id;
    this.name = name;
  }
}

UserController.java

package com.codepuran.controller;

import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.codepuran.dto.ResponseMessageDto;
import com.codepuran.dto.Student;

@RestController
public class UserController {
  @GetMapping("/students")
  public ResponseEntity<?> getAllStudent(HttpServletRequest request) {
    request.getLocalPort();
    List<Student> students = new ArrayList<>();
    students.add(new Student(1l, "Akshay"));
    students.add(new Student(2l, "Karan"));
    students.add(new Student(3l, "Hasmukh"));
    students.add(new Student(4l, "Keyur"));
    students.add(new Student(5l, "Prashant"));
    return ResponseEntity.ok(new ResponseMessageDto(request.getLocalPort(), students));
  }
}