19.05.26 jsp 게시판 답글 작성 (model 2 동영상 18강)

Back-End/JSP 2019. 5. 26. 13:33

답글 작성 구현





BoardReWriteForm.jsp (답글 작성 페이지)

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<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
    <center>
        <h2>답변글 입력하기</h2>
 
        <form action="BoardReWriteProcCon.do" method="post">
            <!-- 답변글 처리 페이지로 자료를 전달 -->
            <table width="600" border="1" bordercolor="gray" bgcolor="skyblue">
 
                <tr height="40">
                    <td width="150" align="center">작성자</td>
                    <td width="450"><input type="text" name="writer" size="60"></td>
                </tr>
 
                <tr height="40">
                    <td width="150" align="center">제목</td>
                    <td width="450"><input type="text" name="subject" value="[답변]"
                        size="60"></td>
                </tr>
 
                <tr height="40">
                    <td width="150" align="center">이메일</td>
                    <td width="450"><input type="email" name="email" size="60"></td>
                </tr>
 
                <tr height="40">
                    <td width="150" align="center">비밀번호</td>
                    <td width="450"><input type="password" name="password"
                        size="60"></td>
                </tr>
 
                <tr height="40">
                    <td width="150" align="center">글내용</td>
                    <td width="450"><textarea rows="10" cols="60" name="content"></textarea></td>
                </tr>
                <!-- form에서 사용자로부터 입력 받지 않고 데이터를 넘김 -->
                <tr height="40">
                    <!-- 각 데이터에 맞는 버튼을 만들어준다. -->
                    <td align="center" colspan="2"><input type="hidden" name="ref"
                        value="${ref }"> <input type="hidden" name="re_step"
                        value="${re_step }"> <input type="hidden" name="re_level"
                        value="${re_level }"> <input type="submit" value="답글쓰기완료">
                        &nbsp;&nbsp; <input type="reset" value="취소"> &nbsp;&nbsp;
                        <input type="button" onclick="location.href='BoardListCon.do'"
                        value="전체글보기"></td>
                    <!-- 리스트 화면으로 돌아가는 버튼 -->
                </tr>
 
            </table>
        </form>
    </center>
</body>
</html>
cs



BoardReWriteCon.java (답글 작성 서블릿)

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.package control;
 
import java.io.IOException;
 
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 model.BoardBean;
import model.BoardDAO;
 
/**
 * Servlet implementation class BoardWriteProcCon
 */
// 글쓰기 처리 서블릿 선언
@WebServlet("/BoardReWriteCon.do")
public class BoardReWriteCon extends HttpServlet {
 
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        reqPro(request, response);
    }
 
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        reqPro(request, response);
    }
 
    protected void reqPro(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
 
        // 한글타입이 아니기 때문에 한글처리는 안해도됨
        // 답글쓰기 같은 경우는 시퀀스가 있기때문에 자동으로 부여되서
        // 궂이 num값을 받아서 할 필요가 없다
        // Integer.pareInt는 문자를 int형식으로 변환할때 사용
        int ref = Integer.parseInt(request.getParameter("ref"));
        int re_step = Integer.parseInt(request.getParameter("re_step"));
        int re_level = Integer.parseInt(request.getParameter("re_level"));
 
        // 글관련 정보들을 다른페이지로 넘겨주기 위해서 담아놓는다.
        request.setAttribute("ref", ref);
        request.setAttribute("re_step", re_step);
        request.setAttribute("re_level", re_level);
 
        // BoardReWriteForm.jsp파일에 request, response에 담아놓은 자료들을 넘겨준다.
        RequestDispatcher dis = request.getRequestDispatcher("BoardReWriteForm.jsp");
        dis.forward(request, response);
    }
}
cs



BoardReWriteProcCon.java (답글 처리 서블릿)

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.package control;
 
import java.io.IOException;
 
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 model.BoardBean;
import model.BoardDAO;
 
/**
 * Servlet implementation class BoardReWriteProcCon
 */
@WebServlet("/BoardReWriteProcCon.do")
public class BoardReWriteProcCon extends HttpServlet {
 
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        reqPro(request, response);
    }
 
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        reqPro(request, response);
    }
 
    protected void reqPro(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // 빈클래스안에 받아온 데이터를 저장
        BoardBean bean = new BoardBean();
 
        request.setCharacterEncoding("euc-kr");
 
        bean.setWriter(request.getParameter("writer"));
        bean.setSubject(request.getParameter("subject"));
        bean.setEmail(request.getParameter("email"));
        bean.setPassword(request.getParameter("password"));
        bean.setContent(request.getParameter("content"));
 
        bean.setRef(Integer.parseInt(request.getParameter("ref")));
        bean.setRe_step(Integer.parseInt(request.getParameter("re_step")));
        bean.setRe_level(Integer.parseInt(request.getParameter("re_level")));
 
        BoardDAO bdao = new BoardDAO();
        // DAO클래스에 Insert메서드에 빈을 매개변수로 넘겨준다.
        bdao.reInsertBoard(bean);
 
        RequestDispatcher dis = request.getRequestDispatcher("BoardListCon.do");
        dis.forward(request, response);
 
    }
}
 
cs



BoardDAO.java (DB연결)

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.package model;
 
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Vector;
 
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
 
public class BoardDAO {
 
    Connection con;
    PreparedStatement pstmt;
    ResultSet rs;
 
    // 데이터 베이스에 연결 메소드
    public void getCon() {
        try {
            Context initctx = new InitialContext();
            Context envctx = (Context) initctx.lookup("java:comp/env");
            // 타입이 데이터 소스이므로 데이터소스로 (타입변환해서) 받는다.
            DataSource ds = (DataSource) envctx.lookup("jdbc/pool");
            // 얻은 데이터소스를 사용해 연결한다.
            con = ds.getConnection(); // 커넥션 연결 해주는 메소드
 
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    // 전체 게시글의 갯수를 리턴하는 메소드
    public int getAllCount() {
        getCon();
        // 개시글의 갯수를 세야하기 때문에 카운트 변수를 추가하고 초기값을 선언한다.
        int count = 0;
 
        try {
            // sql 쿼리 준비함
            String sql = "select count(*) from board";
            pstmt = con.prepareStatement(sql);
            // ?표가 없으므로 바로 결과실행후 리턴시켜주면 된다.
            rs = pstmt.executeQuery();
            // 전체게시글은 한칸에서 밖에 출력이 되지 않으므로 1칸만 있으면 된다. 반복문 말고 if문으로 사용한다.
            if (rs.next()) { // 데이터가 있다면 카운트에 넣는다.
                // 전체 게시글 수
                count = rs.getInt(1);
            }
            con.close();
 
        } catch (Exception e) {
            e.printStackTrace();
        }
        return count;
    }
 
    // 화면에 보여질 데이터를 10개씩 추출해서 리턴하는 메소드
    public Vector<BoardBean> getAllBoard(int startRow, int endRow) {
        // 리턴할객체 선언
        getCon();
        Vector<BoardBean> v = new Vector<>();
        try {
            // 쿼리 작성
            String sql = "select * from (select A.*, Rownum Rnum from (select * from board order by ref desc, re_step asc)A)"
                    + "where Rnum >= ? and Rnum <= ?";
            // 쿼리 실행할 객체를 선언
            pstmt = con.prepareStatement(sql);
            pstmt.setInt(1, startRow);
            pstmt.setInt(2, endRow);
            // 쿼리실행후 결과 저장
            rs = pstmt.executeQuery();
            // 데이터 개수가 몇개인지 모르기에 반복문을 이용하여 데이터를 추출
            while (rs.next()) {
                // 데이터를 패키징 ( BoardBean 클래스를 이용) 해줌
                BoardBean bean = new BoardBean();
                bean.setNum(rs.getInt(1));
                bean.setWriter(rs.getString(2));
                bean.setEmail(rs.getString(3));
                bean.setSubject(rs.getString(4));
                bean.setPassword(rs.getString(5));
                bean.setReg_date(rs.getDate(6).toString());
                bean.setRef(rs.getInt(7));
                bean.setRe_step(rs.getInt(8));
                bean.setRe_level(rs.getInt(9));
                bean.setReadcount(rs.getInt(10));
                bean.setContent(rs.getString(11));
                // 패키징한 데이터를 벡터에 저장
                v.add(bean);
            }
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return v;
    }
 
    // 하나의 게시글을 저장하는 메소드 호출
    public void insertBoard(BoardBean bean) {
 
        getCon();
        // 초기값 지정
        int ref = 0;
        int re_step = 1;// 새글이기에
        int re_level = 1;// 새글이기에
 
        try {
            // 쿼리 작성
            // 이 sql에서 1만 더하면 되기때문에 가장큰값을 검색
            String refsql = "select max(ref) from board";
            pstmt = con.prepareStatement(refsql);
            // 쿼리 실행후 결과를 리턴
            rs = pstmt.executeQuery();
            if (rs.next()) {
                ref = rs.getInt(1) + 1; // ref가장 큰 값에 1을 더해줌
                // 최신글은 글번호가 가장 크기 때문에 원래 있던 글에서 1을 더해줌
 
            }
            // 데이터를 삽입하는 쿼리
            String sql = "insert into board values(board_seq.NEXTVAL,?,?,?,?,sysdate,?,?,?,0,?)";
            pstmt = con.prepareStatement(sql);
            // ?에 값을 매핑한다.
            pstmt.setString(1, bean.getWriter());
            pstmt.setString(2, bean.getEmail());
            pstmt.setString(3, bean.getSubject());
            pstmt.setString(4, bean.getPassword());
            pstmt.setInt(5, ref);
            pstmt.setInt(6, re_step);
            pstmt.setInt(7, re_level);
            pstmt.setString(8, bean.getContent());
 
            pstmt.executeUpdate();
            con.close();
 
        } catch (Exception e) {
            e.printStackTrace();
        }
 
    }
 
    // 하나의 게시글을 읽어들이는 메소드 작성
    // 게시글을 읽었다는 뜻은 조회수가 1증가된다는 뜻
    // 게시글을 누르면 조회수도 올라가야함
    public BoardBean getOneBoard(int num) {
        getCon();
        // 초기값이니까 null을 준다.
        BoardBean bean = null;
        try {
            // 하나의 게시글을 읽었을때 조회수 증가
            String countsql = "update board set readcount = readcount+1 where num=?";
            pstmt = con.prepareStatement(countsql);
            pstmt.setInt(1, num);
            // 쿼리를 실행
            pstmt.executeUpdate();
 
            // 한 게시글에 대한 정보를 리턴해주는 쿼리를 작성
            String sql = "select * from board where num=?";
            pstmt = con.prepareStatement(sql);
            // ?에 값을 집어넣기
            pstmt.setInt(1, num);
            // 쿼리실행후 결과를 리턴
            rs = pstmt.executeQuery();
            if (rs.next()) {
                bean = new BoardBean();
                bean.setNum(rs.getInt(1));
                bean.setWriter(rs.getString(2));
                bean.setEmail(rs.getString(3));
                bean.setSubject(rs.getString(4));
                bean.setPassword(rs.getString(5));
                bean.setReg_date(rs.getDate(6).toString());
                bean.setRef(rs.getInt(7));
                bean.setRe_step(rs.getInt(8));
                bean.setRe_level(rs.getInt(9));
                bean.setReadcount(rs.getInt(10));
                bean.setContent(rs.getString(11));
 
            }
 
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bean;
 
    }
 
    // 답변글을 저장하는 메소드
    public void reInsertBoard(BoardBean bean) {
        getCon();
        // 초기값 지정
        int ref = bean.getRef();
        int re_step = bean.getRe_step();
        int re_level = bean.getRe_level();
 
        try {
            // 쿼리 작성
            // 이 sql에서 1만 더하면 되기때문에 가장큰값을 검색
            // 답변형 게시판의 특징인 글을 쓰면 먼저쓴글이 가장 위로 올라가야 하기 때문에 다른글들은 다 밑으로 내려야한다.
            String relevelsql = "update board set re_level=re_level+1 where ref=? and re_level >?";
            pstmt = con.prepareStatement(relevelsql);
            pstmt.setInt(1, ref);
            pstmt.setInt(2, re_level);
 
            // 쿼리 실행후 결과를 리턴
            pstmt.executeUpdate();
 
            // 데이터를 삽입하는 쿼리
            String sql = "insert into board values(board_seq.NEXTVAL,?,?,?,?,sysdate,?,?,?,0,?)";
            pstmt = con.prepareStatement(sql);
            // ?에 값을 매핑한다.
            pstmt.setString(1, bean.getWriter());
            pstmt.setString(2, bean.getEmail());
            pstmt.setString(3, bean.getSubject());
            pstmt.setString(4, bean.getPassword());
            pstmt.setInt(5, ref);
            pstmt.setInt(6, re_step + 1); // 기존 부모글에 스텝보다 1을 증가시켜야 한다.
            pstmt.setInt(7, re_level + 1); // 기존 부모글에 스텝보다 1을 증가시켜야 한다.
            pstmt.setString(8, bean.getContent());
 
            pstmt.executeUpdate();
            con.close();
 
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
cs




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