[Servlet / JSP] 게시판 만들기 등록, 쓰기, 수정, 삭제 CRUD (최종)

BoardController

package controller;
 
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
 
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import dto.BoardDTO;
 
 
@WebServlet("*.do")
public class BoardController extends HttpServlet {
    private static final long serialVersionUID = 1L;
      
    // 클래스에서 변수는 생성만 해주고 다른곳(생성자)에서 값을 주는게 좋다.
    private int boardNum;
    private List<BoardDTO> boardList;
    
    
    
    public BoardController() {
        super();
        boardNum = 1;
        boardList = new ArrayList<>();
      
    }
 
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doProcess(request, response);
    }
 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doProcess(request, response);
    }
 
    public void doProcess(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException{
        
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html; charset=UTF-8");
 
 
        String requestURI = request.getRequestURI();
        String contextPath = request.getContextPath();
        String command = requestURI.substring(contextPath.length());
        System.out.println("command = " + command);
        
        //응답 페이지
        String page = "";
        // 맨 밑 페이지 이동시 쓰는거.
        boolean isRedirect = false;
        
        if(command.equals("/boardList.do"))
        {
            request.setAttribute("list", boardList);
            
            page = "boardList.jsp";
        }
        
        //글쓰기 페이지로 이동
        if(command.equals("/regBoardForm.do"))
        {
            page="board_write_form.jsp";
        }
        
        //글 등록 실행
        if(command.equals("/regBoard.do"))
        {
            //데이터 받기
            String title = request.getParameter("title");
            String content = request.getParameter("content");
            String writer = request.getParameter("writer");
            String createDate = request.getParameter("createDate");
            
            //위에서 전달받은 데이터를 갖는 게시글 생성
            BoardDTO board = new BoardDTO(boardNum, title, content, writer, createDate);
            // BoardDTO의 첫번쨰 boardNum = 글번호
            boardNum++;
            
            
            
            boardList.add(board);
            
            //page="boardList.jsp";
            page ="boardList.do";
            // 맨 밑 페이지 이동시 쓰는거. 일단 page이동 do로 끝내는것만. 기억하자.
            isRedirect = true;
        }
        
        //게시글 상세보기
        if(command.equals("/boardDetail.do"))
        {
            int num = Integer.parseInt(request.getParameter("boardNum"));
            
            //게시글 목록에서 넘겨온 글번호와 같은 게시글 찾기.
            // boardList로 반복할거다. 반복해서 뽑으면 그게 BoardDTO.
            for(BoardDTO board: boardList) {
                if(board.getBoardNum() == num) {
                    request.setAttribute("board", board );
                }
            }
            
            page="boardDetail.jsp";
        }
        
        //게시글 삭제하기
        if(command.equals("/delete.do"))
        {
            //boardNum이라는 문자열을 받아온다. int형 변환을 함께해준다.
            int num = Integer.parseInt(request.getParameter("boardNum"));
            
            for(int i =0; i<boardList.size(); i++)
            {
                //리스트 뒤에 get은 순번. 
                if(boardList.get(i).getBoardNum() == num )
                {
                    boardList.remove(i);
                    
                }
            }
            
            
            
            //page="boarList.jsp"; 이렇게 들고가면 데이터 안가져가준다. 화며네 암것도안봉미.
            page="boarList.do";
        }
        
        //게시글 수정 페이지로 이동
        if(command.equals("/updateBoardForm.do"))
        {
            int num = Integer.parseInt(request.getParameter("boardNum"));
            
            for(BoardDTO board : boardList) {
                if(board.getBoardNum() == num) {
                    request.setAttribute("board", board);
                }
            }
            //수정하고자 하는 게시글의 정보를 jsp에 보내줘야함.
            page = "update_board_form.jsp";
        }
        
        //글 수정
        if(command.equals("/updateBoard.do"))
        {
            String title = request.getParameter("title");
            String writer = request.getParameter("writer");
            String createDate = request.getParameter("createDate");
            String content = request.getParameter("content");
            int num = Integer.parseInt(request.getParameter("boardNum"));
            
            for(BoardDTO board : boardList) {
                if(board.getBoardNum()==num)
                {
                    board.setTitle(title);
                    board.setWriter(writer);
                    board.setContent(content);
                    board.setCreateDate(createDate);
                }
            }
            
            page="boarList.do";
            //page = "boardDetail.do?boardNum=" + num; 왜 이거지?
        }
        
        // 페이지 이동.
        if(isRedirect) {
            response.sendRedirect(page);
        }
        else {
            RequestDispatcher dispatcher = request.getRequestDispatcher(page);
            dispatcher.forward(request, response);
        }
                
        
        
        
    }
    
}
 

BoardDTO

package dto;
 
public class BoardDTO {
   private int boardNum;
   private String title;
   private String content;
   private String writer;
   private String createDate;
   
   public BoardDTO(int boardNum, String title, String content, String writer, String createDate) {
      super();
      this.boardNum = boardNum;
      this.title = title;
      this.content = content;
      this.writer = writer;
      this.createDate = createDate;
   }
 
   public int getBoardNum() {
      return boardNum;
   }
 
   public void setBoardNum(int boardNum) {
      this.boardNum = boardNum;
   }
 
   public String getTitle() {
      return title;
   }
 
   public void setTitle(String title) {
      this.title = title;
   }
 
   public String getContent() {
      return content;
   }
 
   public void setContent(String content) {
      this.content = content;
   }
 
   public String getWriter() {
      return writer;
   }
 
   public void setWriter(String writer) {
      this.writer = writer;
   }
 
   public String getCreateDate() {
      return createDate;
   }
 
   public void setCreateDate(String createDate) {
      this.createDate = createDate;
   }
 
   
}
 
 

board_write_form

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="regBoard.do" method="post">
   <table>
      <tr>
         <td>제목</td>
         <td><input type="text" name="title"></td>
      </tr>
      <tr>
         <td>작성자</td>
         <td><input type="text" name="writer"></td>
      </tr>
      <tr>
         <td>작성일</td>
         <td><input type="date" name="createDate"></td>
      </tr>
      <tr>
         <td>내용</td>
         <td>
            <textarea rows="5" cols="50" name="content"></textarea>
         </td>
      </tr>
   </table>
   <input type="submit" value="글등록">
</form>
</body>
</html>
 

boardDetail

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
 
글번호 : ${board.boardNum }<br>
제목 : ${board.title } <br>
내용 : ${board.content }<br>
작성자 : ${board.writer }<br>
작성일 : ${board.createDate }<br>
 
<input type="button" value="삭제하기" onclick="location.href='delete.do?boardNum=${board.boardNum }';">
<!-- 어떤걸 삭제할건지 보드 번호를 가져가야해서 ?뒤에 문장이나옴. -->
<input type="button" value="수정" onclick="location.href='updateBoardForm.do?boardNum=${board.boardNum }';">
<!-- 상세보기 페이지로 넘어갈때도 글번호 데이터를 넘겨서 가져가야해서 ?뒤에 문장을쓴다. -->
</body>
</html>

boardList

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
table{
   border: 1px solid black;
   border-collapse: collapse;
   text-align: center;
   width: 600px;
}
tr, td{
   border: 1px solid black;
}
</style>
</head>
<body>
<table>
   <colgroup>
      <col width="10%">
      <col width="*">
      <col width="15%">
      <col width="15%">
   </colgroup>
   <tr>
      <td>글번호</td>
      <td>제 목</td>
      <td>작성자</td>
      <td>작성일</td>
   </tr>
   
   <!-- a태그에서 데이터를 넘길때에는 ? 를 쓴다. 
       boardNum이라는 글번호를 가지고 가겠다. -->
      <!-- 게시글 개수만큼 만들어줘야한다.taglib만들어주고. -->
      <c:forEach items="${list }" var="board">
      <tr>
          <td>${board.boardNum }</td>
          <td><a href="boardDetail.do?boardNum=${board.boardNum }">${board.title }</a></td>
          <td>${board.writer }</td>
          <td>${board.createDate }</td>
      </tr>
      </c:forEach>
         
   
</table>
<input type="button" value="글쓰기" onclick="location.href='regBoardForm.do';">
</body>
</html>
 

index

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 프로젝트 실행 시 바로 페이지 이동 -->
<jsp:forward page="boardList.do"></jsp:forward>
</body>
</html>

update_board_form

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="updateBoard.do" method="post">
<input type="hidden" name="boardNum" value="${board.boardNum }">
<table>
    <tr>
        <td>제목</td>
        <td><input type="text" name="title" value="${board.title }"></td>
    </tr>
    <tr>
        <td>작성자</td>
        <td><input type="text" name="writer" value="${board.writer }"></td>
    </tr>
    <tr>
        <td>작성일</td>
        <!-- read온리는 수정은 안되지만, 데이터가 넘어간다. -->
        <td><input type="text" name="createDate" value="${board.createDate }" readonly></td>
    </tr>
    <tr>
        <td>내용</td> <!--textarea는 value가 없다. 여는태그, 닫는태그 사이에 넣어준다.  -->
        <td><textarea rows="5" cols="50">${board.content }</textarea></td>
    </tr>
</table>
<input type="submit" value="글수정">
</form>
</body>
</html>

 

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결과화면

 

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