[FEAT]회사 목록 전체/4개만 보여지는 기능 추가

src/main/java/goorm_3team/company/controllers/UserController.java

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+package goorm_3team.company.controllers;
+
+import goorm_3team.company.dto.CompanyDetailResponseDto;
+import goorm_3team.company.dto.CompanySimpleResponseDto;
+import goorm_3team.company.dto.DataResponse;
+import goorm_3team.company.dto.JobDescriptionSimpleDto;
+import goorm_3team.company.models.Company;
+import goorm_3team.company.models.JobDescription;
+import goorm_3team.company.services.UserService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
+import org.springframework.data.web.PageableDefault;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import java.util.List;
+
+
+// 사용자용 API 컨트롤러
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/user")
+public class UserController {
+
+    // UserService 주입됨
+    private final UserService userService;
+
+    // 모든 회사 리스트 조회
+    @GetMapping("/companies/all")
+    public ResponseEntity<DataResponse> getCompanies(@PageableDefault(sort = "id", direction = Sort.Direction.DESC, size = 10) Pageable pageable) {
+        //내림차순
+        // true 전달 → 전체 회사 리스트 조회함
+        return ResponseEntity.ok(userService.findCompanies(true, pageable));
+    }
+
+    // 최신 회사 4개만 조회
+    @GetMapping("/companies/latest")
+    public ResponseEntity<DataResponse> getLastestCompanies(@PageableDefault(sort = "id", direction = Sort.Direction.DESC, size = 4) Pageable pageable) {
+        // false 전달 → 최신 회사 4개만 조회함
+        return ResponseEntity.ok(userService.findCompanies(false, pageable));
+    }
+
+    // 특정 회사의 채용공고 리스트 조회
+    @GetMapping("/jobs/company/{id}")
+    public ResponseEntity<CompanyDetailResponseDto> getCompany(@PathVariable Long id) {
+        // 회사 ID 기준으로 JD 리스트 반환함
+        return ResponseEntity.ok(userService.searchJobDescriptionByCompany(id));
+    }
+
+    // 필터 조건(기업유형, 경력)에 따른 채용공고 검색
+    @GetMapping("/jobs/filter")
+    public ResponseEntity<List<JobDescriptionSimpleDto>> searchJobs(
+            @RequestParam(required = false, defaultValue = "") String companyType,
+            @RequestParam(required = false, defaultValue = "0") Integer career) {
+        // 필터 기준에 맞는 JD 리스트 반환함
+        return ResponseEntity.ok(userService.searchJobDescriptionByFilter(companyType, career));
+    }
+}

src/main/java/goorm_3team/company/dto/CompanySimpleResponseDto.java

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+package goorm_3team.company.dto;
+
+import goorm_3team.company.models.Company;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class CompanySimpleResponseDto {
+    private Long id;
+    private String name;
+    private String companyType;
+    private String address;
+
+    public static CompanySimpleResponseDto toDto(Company company) {
+        Long id = company.getId();
+        String name = company.getName();
+        String companyType = company.getCompanyType();
+        String address = company.getAddress();
+        return new CompanySimpleResponseDto(id, name, companyType, address);
+    }
+}

src/main/java/goorm_3team/company/dto/DataResponse.java

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+package goorm_3team.company.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+import java.util.List;
+
+@Data
+@AllArgsConstructor
+public class DataResponse {
+    private boolean hasNext;
+    private List<?> list;
+}

src/main/java/goorm_3team/company/models/Company.java

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+package goorm_3team.company.models;
+
+import goorm_3team.company.dto.CompanyRequestDto;
+import goorm_3team.company.dto.JobDescriptionRequestDto;
+import java.util.List;
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.OneToMany;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+// 회사 정보를 나타내는 JPA 엔티티 클래스
+// DB의 company 테이블과 매핑됨
+@Entity
+@Setter
+@Getter
+@NoArgsConstructor // 기본 생성자 필요 (JPA에서 필수로 사용함)
+public class Company {
+
+    @Id // 기본 키 지정
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // 자동 증가 값 사용 (MySQL 기준)
+    private Long id;
+
+    // 회사명 (예: 삼성전자)
+    private String name;
+
+    // 주소 (예: 서울 강남구 ...)
+    private String address;
+
+    // 회사 유형 (예: 대기업, 스타트업 등)
+    private String companyType;
+
+    @OneToMany(mappedBy = "company", targetEntity = JobDescription.class, cascade = CascadeType.ALL, fetch = FetchType.LAZY)
+    private List<JobDescription> jobDescriptions;
+
+    // DTO를 받아서 Company 객체로 변환하는 생성자
+    public Company(CompanyRequestDto req) {
+        setName(req.getName());
+        setAddress(req.getAddress());
+        setCompanyType(req.getCompanyType());
+    }
+
+    public Company(String name, String address, String companyType) {
+        this.name = name;
+        this.address = address;
+        this.companyType = companyType;
+    }
+}

src/main/java/goorm_3team/company/repositories/CompanyRepository.java

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+package goorm_3team.company.repositories;
+
+import goorm_3team.company.models.Company;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+// 회사 엔티티(Company)에 대한 DB 접근 인터페이스
+// JpaRepository를 상속받으면 기본적인 CRUD 메서드가 자동으로 생성됨
+public interface CompanyRepository extends JpaRepository<Company, Long> {
+
+    // 회사 유형(companyType)에 따라 회사 목록을 조회함
+    // 예: "대기업", "스타트업" 등으로 필터링할 때 사용함
+    List<Company> findByCompanyType(String companyType);
+}

src/main/java/goorm_3team/company/services/UserService.java

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+package goorm_3team.company.services;
+
+import goorm_3team.company.dto.CompanyDetailResponseDto;
+import goorm_3team.company.dto.CompanySimpleResponseDto;
+import goorm_3team.company.dto.DataResponse;
+import goorm_3team.company.dto.JobDescriptionSimpleDto;
+import goorm_3team.company.models.Company;
+import goorm_3team.company.models.JobDescription;
+import goorm_3team.company.repositories.CompanyRepository;
+import goorm_3team.company.repositories.JobDescriptionRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Sort;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+// 사용자 요청을 처리하는 서비스 클래스
+// 회사 목록 조회, JD 검색 등의 기능을 제공함
+@Service
+@RequiredArgsConstructor
+public class UserService {
+
+    private final CompanyRepository companyRepository;
+    private final JobDescriptionRepository jobDescriptionRepository;
+
+    // 회사 목록 조회
+    // isAll이 true면 전체, false면 최신 4개만 반환함
+    public DataResponse findCompanies(boolean isAll, Pageable pageable) {
+        Page<Company> companies; // 변수 선언
+        if (isAll) {
+            // 전체 회사 리스트 반환
+            companies = companyRepository.findAll(pageable);
+        } else {
+            // 최신 회사 4개만 조회 (ID 기준 내림차순 정렬)
+            companies = companyRepository.findAll(PageRequest.of(0, 4, Sort.Direction.DESC, "id"));
+        }
+        List<CompanySimpleResponseDto> companyDtos =  companies.stream().map(company -> CompanySimpleResponseDto.toDto(company)).collect(Collectors.toList());
+        //여기서는 각 Company 객체를 → CompanySimpleResponseDto로 바꿈
+        return new DataResponse(companies.hasNext(), companyDtos);
+    }
+
+    // 회사 유형(companyType)으로 회사 검색
+    //대기업이나 스타트업 회사 유형에ㄷ 따라서 검색!
+    public List<Company> searchCompany(String companyType) {
+        // 빈 문자열로 들어오면 null 처리
+
+        if (companyType.equals("")) {
+            companyType = null;
+        }
+        return companyRepository.findByCompanyType(companyType);
+    }
+
+    // 특정 회사 하나를 기준으로 회사의 모든 채용공고를 함께 조회한다.
+    public CompanyDetailResponseDto searchJobDescriptionByCompany(Long companyId) {
+//        List<JobDescription> jdList = jobDescriptionRepository.findByCompanyId(companyId);
+//        return jdList.stream().map(jobDescription -> JobDescriptionSimpleDto.toDto(jobDescription)).collect(Collectors.toList());
+        Company company = companyRepository.findById(companyId)
+                .orElseThrow(() -> new IllegalArgumentException("해당 ID의 회사가 존재하지 않습니다."));
+        return CompanyDetailResponseDto.toDto(company);
+    }
+
+
+
+
+
+
+    // 회사 유형과 경력 조건으로 JD 리스트 필터링
+    public List<JobDescriptionSimpleDto> searchJobDescriptionByFilter(String companyType, Integer career) {
+        List<JobDescription> jds = jobDescriptionRepository.searchJobsByFilters(companyType, career);
+        return jds.stream().map(jobDescription -> JobDescriptionSimpleDto.toDto(jobDescription)).collect(Collectors.toList());
+    }
+}