[Spring] MVC 프레임워크 만들기

영우·2026년 7월 19일

MVC Spring

프론트 컨트롤러 패턴 소개

프론트 컨트롤러 패턴 소개

FrontController 패턴 특징

프론트 컨트롤러 서블릿 하나로 클라이언트의 요청을 받음
프론트 컨트롤러가 요청에 맞는 컨트롤러를 찾아서 호출
공통 처리 가능
프론트 컨트롤러를 제외한 나머지 컨트롤러는 서블릿을 사용하지 않아도 됨

스프링 웹 MVC와 프론트 컨트롤러

스프링 웹 MVC의 핵심도 바로 FrontController
스프링 웹 MVC의 DispatcherServlet이 FrontController 패턴으로 구현되어 있음

프론트 컨트롤러 도입 - v1

프론트 컨트롤러 도입 - v1

ControllerV1

package hello.servlet.web.frontcontroller.v1;

import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

public interface ControllerV1 {

  void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException;

}

서블릿과 비슷한 모양의 컨트롤러 인터페이스를 도입한다.
각 컨트롤러들은 이 인터페이스를 구현하면 된다.
프론트 컨트롤러는 이 인터페이스를 호출해서 구현과 관계없이 로직의 일관성을 가져갈 수 있다.

MemberFormControllerV1 - 회원 등록 컨트롤러

package hello.servlet.web.frontcontroller.v1.controller;

import hello.servlet.web.frontcontroller.v1.ControllerV1;
import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

public class MemberFormControllerV1 implements ControllerV1 {

  @Override
  public void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String viewPath = "/WEB-INF/views/new-form.jsp";
    RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
    dispatcher.forward(request, response);
  }
}

MemberSaveControllerV1 - 회원 저장 컨트롤러

package hello.servlet.web.frontcontroller.v1.controller;

import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
import hello.servlet.web.frontcontroller.v1.ControllerV1;
import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

public class MemberSaveControllerV1 implements ControllerV1 {

  private MemberRepository memberRepository = MemberRepository.getInstance();

  @Override
  public void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    System.out.println("MemberSaveServlet.service");
    String username = request.getParameter("username");
    int age = Integer.parseInt(request.getParameter("age"));

    Member member = new Member(username, age);
    memberRepository.save(member);

    //Model에 데이터를 보관한다.
    request.setAttribute("member", member);

    String viewPath = "/WEB-INF/views/save-result.jsp";
    RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
    dispatcher.forward(request, response);
  }
}

MemberListControllerV1 - 회원 목록 컨트롤러

package hello.servlet.web.frontcontroller.v1.controller;

import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
import hello.servlet.web.frontcontroller.v1.ControllerV1;
import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.List;

public class MemberListControllerV1 implements ControllerV1 {

  private MemberRepository memberRepository = MemberRepository.getInstance();

  @Override
  public void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    List<Member> members = memberRepository.findAll();

    request.setAttribute("members", members);

    String viewPath = "/WEB-INF/views/members.jsp";
    RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
    dispatcher.forward(request, response);
  }
}

FrontControllerServletV1 - 프론트 컨트롤러

package hello.servlet.web.frontcontroller.v1;

import hello.servlet.web.frontcontroller.v1.controller.MemberFormControllerV1;
import hello.servlet.web.frontcontroller.v1.controller.MemberListControllerV1;
import hello.servlet.web.frontcontroller.v1.controller.MemberSaveControllerV1;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@WebServlet(name = "frontControllerServletV1", urlPatterns = "/front-controller/v1/*")
public class FrontControllerServletV1 extends HttpServlet {

  private Map<String, ControllerV1> contorllerMap = new HashMap<>();

  public FrontControllerServletV1() {
    contorllerMap.put("/front-controller/v1/members/new-form", new MemberFormControllerV1());
    contorllerMap.put("/front-controller/v1/members/save",  new MemberSaveControllerV1());
    contorllerMap.put("/front-controller/v1/members",  new MemberListControllerV1());
  }

  @Override
  protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    System.out.println("FrontControllerServletV1.service");

    String requestURI = request.getRequestURI();

    ControllerV1 controller = contorllerMap.get(requestURI);
    if(controller == null) {
      response.setStatus(HttpServletResponse.SC_NOT_FOUND);
      return;
    }

    controller.process(request, response);
  }
}

urlPatterns = "/front-controller/v1/*" : /front controller/v1 를 포함한 하위 모든 요청은 이 서블릿에서 받아들인다.

먼저 requestURI 를 조회해서 실제 호출할 컨트롤러를 controllerMap 에서 찾는다. 만약 없다면 404(SC_NOT_FOUND) 상태 코드를 반환한다

View 분리 - v2

View 분리 - v2

모든 컨트롤러에서 뷰로 이동하는 부분에 중복이 있다.

String viewPath = "/WEB-INF/views/new-form.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
dispatcher.forward(request, response);

MyView

package hello.servlet.web.frontcontroller;

import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.Map;

public class MyView {
  private String viewPath;

  public MyView(String viewPath) {
    this.viewPath = viewPath;
  }

  public void render(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
    dispatcher.forward(request, response);
  }

ControllerV2

package hello.servlet.web.frontcontroller.v2;

import hello.servlet.web.frontcontroller.MyView;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

public interface ControllerV2 {

  MyView process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException;

}

MemberFormControllerV2 - 회원 등록 폼

package hello.servlet.web.frontcontroller.v2.controller;

import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
import hello.servlet.web.frontcontroller.MyView;
import hello.servlet.web.frontcontroller.v2.ControllerV2;
import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

public class MemberSaveControllerV2 implements ControllerV2 {

  private MemberRepository memberRepository = MemberRepository.getInstance();

  @Override
  public MyView process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    System.out.println("MemberSaveServlet.service");
    String username = request.getParameter("username");
    int age = Integer.parseInt(request.getParameter("age"));

    Member member = new Member(username, age);
    memberRepository.save(member);

    //Model에 데이터를 보관한다.
    request.setAttribute("member", member);

    return new MyView("/WEB-INF/views/save-result.jsp");
  }
}

MemberListControllerV2 - 회원 목록

package hello.servlet.web.frontcontroller.v2.controller;

import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
import hello.servlet.web.frontcontroller.MyView;
import hello.servlet.web.frontcontroller.v2.ControllerV2;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.List;

public class MemberListControllerV2 implements ControllerV2 {

  private MemberRepository memberRepository = MemberRepository.getInstance();

  @Override
  public MyView process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    List<Member> members = memberRepository.findAll();
    request.setAttribute("members", members);
    return new  MyView("/WEB-INF/views/members.jsp");
  }
}

프론트 컨트롤러 V2

package hello.servlet.web.frontcontroller.v2;

import hello.servlet.web.frontcontroller.MyView;
import hello.servlet.web.frontcontroller.v1.ControllerV1;
import hello.servlet.web.frontcontroller.v2.controller.MemberFormControllerV2;
import hello.servlet.web.frontcontroller.v2.controller.MemberListControllerV2;
import hello.servlet.web.frontcontroller.v2.controller.MemberSaveControllerV2;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@WebServlet(name = "frontControllerServletV2", urlPatterns = "/front-controller/v2/*")
public class FrontControllerServletV2 extends HttpServlet {

  private Map<String, ControllerV2> contorllerMap = new HashMap<>();

  public FrontControllerServletV2() {
    contorllerMap.put("/front-controller/v2/members/new-form", new MemberFormControllerV2());
    contorllerMap.put("/front-controller/v2/members/save",  new MemberSaveControllerV2());
    contorllerMap.put("/front-controller/v2/members",  new MemberListControllerV2());
  }

  @Override
  protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String requestURI = request.getRequestURI();

    ControllerV2 controller = contorllerMap.get(requestURI);
    if(controller == null) {
      response.setStatus(HttpServletResponse.SC_NOT_FOUND);
      return;
    }

    MyView view = controller.process(request, response);
    view.render(request, response);
  }
}

ControllerV2의 반환 타입이 MyView 이므로 프론트 컨트롤러는 컨트롤러의 호출 결과로 MyView 를 반환 받는다.
그리고 view.render() 를 호출하면 forward 로직을 수행해서 JSP가 실행된다.

public void render(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
	dispatcher.forward(request, response);
}

프론트 컨트롤러의 도입으로 MyView 객체의 render() 를 호출하는 부분을 모두 일관되게 처리할 수 있다. 각각의 컨트롤러는 MyView 객체를 생성만 해서 반환하면 된다.

Model 추가 - v3

Model 추가 - v3

서블릿 종속성 제거
컨트롤러 입장에서 HttpServletRequest, HttpServletResponse이 꼭 필요할까?
요청 파라미터 정보는 자바의 Map으로 대신 넘기도록 하면 지금 구조에서는 컨트롤러가 서블릿 기술을 몰라도 동작할 수 있다.

그리고 request 객체를 Model로 사용하는 대신에 별도의 Model 객체를 만들어서 반환하면 된다.

뷰 이름 중복 제거
컨트롤러에서 지정하는 뷰 이름에 중복이 있는 것을 확인할 수 있다.
컨트롤러는 뷰의 논리 이름을 반환하고, 실제 물리 위치의 이름은 프론트 컨트롤러에서 처리하도록 단순화 하자.
이렇게 해두면 향후 뷰의 폴더 위치가 함께 이동해도 프론트 컨트롤러만 고치면 된다.

ModelView

package hello.servlet.web.frontcontroller;

import java.util.HashMap;
import java.util.Map;

public class ModelView {
  private String viewName;
  private Map<String, Object> model = new HashMap<>();

  public ModelView(String viewName) {
    this.viewName = viewName;
  }

  public String getViewName() {
    return viewName;
  }

  public void setViewName(String viewName) {
    this.viewName = viewName;
  }

  public Map<String, Object> getModel() {
    return model;
  }

  public void setModel(Map<String, Object> model) {
    this.model = model;
  }
}

ControllerV3

package hello.servlet.web.frontcontroller.v3;

import hello.servlet.web.frontcontroller.ModelView;

import java.util.Map;

public interface ControllerV3 {

  ModelView process(Map<String, String> paramMap);

}

이 컨트롤러는 서블릿 기술을 전혀 사용하지 않는다.
HttpServletRequest가 제공하는 파라미터는 프론트 컨트롤러가 paramMap에 담아서 호출해주면 된다.
응답 결과로 뷰 이름과 뷰에 전달할 Model 데이터를 포함하는 ModelView 객체를 반환하면 된다.

MemberFormControllerV3 - 회원 등록 폼

package hello.servlet.web.frontcontroller.v3.controller;

import hello.servlet.web.frontcontroller.ModelView;
import hello.servlet.web.frontcontroller.v3.ControllerV3;

import java.util.Map;

public class MemberFormControllerV3 implements ControllerV3 {

  @Override
  public ModelView process(Map<String, String> paramMap) {
    return new ModelView("new-form");
  }
}

ModelView 를 생성할 때 new-form 이라는 view의 논리적인 이름을 지정한다. 실제 물리적인 이름은 프론트 컨트롤러에서 처리한다.

MemberSaveControllerV3 - 회원 저장

package hello.servlet.web.frontcontroller.v3.controller;

import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
import hello.servlet.web.frontcontroller.ModelView;
import hello.servlet.web.frontcontroller.v3.ControllerV3;

import java.util.Map;

public class MemberSaveControllerV3 implements ControllerV3 {

  private MemberRepository memberRepository = MemberRepository.getInstance();

  @Override
  public ModelView process(Map<String, String> paramMap) {
    String username = paramMap.get("username");
    int age = Integer.parseInt(paramMap.get("age"));

    Member member = new Member(username, age);
    memberRepository.save(member);

    ModelView mv = new ModelView("save-result");
    mv.getModel().put("member", member);
    return mv;
  }
}

MemberListControllerV3 - 회원 목록

package hello.servlet.web.frontcontroller.v3.controller;

import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
import hello.servlet.web.frontcontroller.ModelView;
import hello.servlet.web.frontcontroller.v3.ControllerV3;

import java.util.List;
import java.util.Map;

public class MemberListControllerV3 implements ControllerV3 {

  private MemberRepository memberRepository = MemberRepository.getInstance();


  @Override
  public ModelView process(Map<String, String> paramMap) {
    List<Member> members;
    members = memberRepository.findAll();
    ModelView mv = new ModelView("members");
    mv.getModel().put("members", members);

    return mv;
  }
}

FrontControllerServletV3

package hello.servlet.web.frontcontroller.v3;

import hello.servlet.web.frontcontroller.ModelView;
import hello.servlet.web.frontcontroller.MyView;
import hello.servlet.web.frontcontroller.v3.controller.MemberFormControllerV3;
import hello.servlet.web.frontcontroller.v3.controller.MemberListControllerV3;
import hello.servlet.web.frontcontroller.v3.controller.MemberSaveControllerV3;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.jspecify.annotations.NonNull;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@WebServlet(name = "frontControllerServletV3", urlPatterns = "/front-controller/v3/*")
public class FrontControllerServletV3 extends HttpServlet {

  private Map<String, ControllerV3> contorllerMap = new HashMap<>();

  public FrontControllerServletV3() {
    contorllerMap.put("/front-controller/v3/members/new-form", new MemberFormControllerV3());
    contorllerMap.put("/front-controller/v3/members/save",  new MemberSaveControllerV3());
    contorllerMap.put("/front-controller/v3/members",  new MemberListControllerV3());
  }

  @Override
  protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String requestURI = request.getRequestURI();

    ControllerV3 controller = contorllerMap.get(requestURI);
    if(controller == null) {
      response.setStatus(HttpServletResponse.SC_NOT_FOUND);
      return;
    }

    Map<String, String> paramMap = createParamMap(request);
    ModelView mv = controller.process(paramMap);

    String viewName = mv.getViewName();
    MyView view = viewResolver(viewName);

    view.render(mv.getModel(), request, response);
  }

  private static @NonNull MyView viewResolver(String viewName) {
    return new MyView("/WEB-INF/views/" + viewName + ".jsp");
  }

  private static @NonNull Map<String, String> createParamMap(HttpServletRequest request) {
    Map<String, String> paramMap = new HashMap<>();
    request.getParameterNames().asIterator()
        .forEachRemaining(paramName -> paramMap.put(paramName, request.getParameter(paramName)));
    return paramMap;
  }
}

MyView

package hello.servlet.web.frontcontroller;

import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.util.Map;

public class MyView {
  private String viewPath;

  public MyView(String viewPath) {
    this.viewPath = viewPath;
  }

  public void render(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
    dispatcher.forward(request, response);
  }

  public void render(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    modelToReqeustAttribute(model, request);
    RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
    dispatcher.forward(request, response);
  }

  private static void modelToReqeustAttribute(Map<String, Object> model, HttpServletRequest request) {
    model.forEach((key, value) -> request.setAttribute(key, value));
  }
}

단순하고 실용적인 컨트롤러 - v4

단순하고 실용적인 컨트롤러 - v4

ControllerV4

package hello.servlet.web.frontcontroller.v4;

import java.util.Map;

public interface ControllerV4 {

  String process(Map<String, String> paramMap, Map<String, Object> model);
}

이번 버전은 인터페이스에 ModelView가 없다.
model 객체는 파라미터로 전달되기 때문에 그냥 사용하면 되고 결과로 뷰의 이름만 반환해주면 된다.

MemberFormControllerV4

package hello.servlet.web.frontcontroller.v4.controller;

import hello.servlet.web.frontcontroller.v4.ControllerV4;

import java.util.Map;

public class MemberFormControllerV4 implements ControllerV4 {


  @Override
  public String process(Map<String, String> paramMap, Map<String, Object> model) {
    return "new-form";
  }
}

정말 단순하게 new-form 이라는 뷰의 논리 이름만 반환하면 된다.

MemberSaveControllerV4

package hello.servlet.web.frontcontroller.v4.controller;

import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
import hello.servlet.web.frontcontroller.v4.ControllerV4;

import java.util.Map;

public class MemberSaveControllerV4 implements ControllerV4 {

  private MemberRepository memberRepository = MemberRepository.getInstance();

  @Override
  public String process(Map<String, String> paramMap, Map<String, Object> model) {
    String username = paramMap.get("username");
    int age = Integer.parseInt(paramMap.get("age"));

    Member member = new Member(username, age);
    memberRepository.save(member);

    model.put("member", member);
    return "save-result";
  }
}

model.put("member", member)
모델이 파라미터로 전달되기 때문에, 모델을 직접 생성하지 않아도 된다.

MemberListControllerV4

package hello.servlet.web.frontcontroller.v4.controller;

import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
import hello.servlet.web.frontcontroller.v4.ControllerV4;

import java.util.List;
import java.util.Map;

public class MemberListControllerV4 implements ControllerV4 {

  private MemberRepository memberRepository = MemberRepository.getInstance();

  @Override
  public String process(Map<String, String> paramMap, Map<String, Object> model) {
    List<Member> members = memberRepository.findAll();
    model.put("members", members);
    return "members";

  }
}

FrontControllerServletV4

package hello.servlet.web.frontcontroller.v4;

import hello.servlet.web.frontcontroller.ModelView;
import hello.servlet.web.frontcontroller.MyView;
import hello.servlet.web.frontcontroller.v4.controller.MemberFormControllerV4;
import hello.servlet.web.frontcontroller.v4.controller.MemberListControllerV4;
import hello.servlet.web.frontcontroller.v4.controller.MemberSaveControllerV4;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.jspecify.annotations.NonNull;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@WebServlet(name = "frontControllerServletV4", urlPatterns = "/front-controller/v4/*")
public class FrontControllerServletV4 extends HttpServlet {

  private Map<String, ControllerV4> contorllerMap = new HashMap<>();

  public FrontControllerServletV4() {
    contorllerMap.put("/front-controller/v4/members/new-form", new MemberFormControllerV4());
    contorllerMap.put("/front-controller/v4/members/save",  new MemberSaveControllerV4());
    contorllerMap.put("/front-controller/v4/members",  new MemberListControllerV4());
  }

  @Override
  protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String requestURI = request.getRequestURI();

    ControllerV4 controller = contorllerMap.get(requestURI);
    if(controller == null) {
      response.setStatus(HttpServletResponse.SC_NOT_FOUND);
      return;
    }

    Map<String, String> paramMap = createParamMap(request);
    Map<String, Object> model = new HashMap<>();
    String viewName = controller.process(paramMap, model);

    MyView view = viewResolver(viewName);
    view.render(model, request, response);
  }

  private static @NonNull MyView viewResolver(String viewName) {
    return new MyView("/WEB-INF/views/" + viewName + ".jsp");
  }

  private static @NonNull Map<String, String> createParamMap(HttpServletRequest request) {
    Map<String, String> paramMap = new HashMap<>();
    request.getParameterNames().asIterator()
        .forEachRemaining(paramName -> paramMap.put(paramName, request.getParameter(paramName)));
    return paramMap;
  }
}

뷰의 논리 이름을 직접 반환

String viewName = controller.process(paramMap, model);
MyView view = viewResolver(viewName);

컨트롤로가 직접 뷰의 논리 이름을 반환하므로 이 값을 사용해서 실제 물리 뷰를 찾을 수 있다.

영우

이전 포스트

[Java] 프로그래머스 LV.2 [1차] 뉴스 클러스터링

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프론트 컨트롤러 패턴 소개

프론트 컨트롤러 도입 - v1

View 분리 - v2

Model 추가 - v3

단순하고 실용적인 컨트롤러 - v4

[Java] 프로그래머스 LV.2 [1차] 뉴스 클러스터링

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