Backend/Jsp

Jsp 게시판 만들기 - 17. 게시글 보기 기능 구현

saintclair 2023. 3. 30. 12:22

1. BbsDAO.jsp 코드수정

package bbs;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.util.ArrayList;

public class BbsDAO {

 

private Connection conn;

private ResultSet rs;

 

public BbsDAO() { //데이터 접근 객체

try {

String dbURL = "jdbc:mysql://localhost:3306/BBS";

String dbID ="root";

String dbPassword = "1234";

Class.forName("com.mysql.jdbc.Driver");

conn = DriverManager.getConnection(dbURL, dbID, dbPassword );

} catch (Exception e) {

e.printStackTrace();

}

}

 

public String getDate() {

String SQL = "SELECT NOW()";

try {

PreparedStatement pstmt = conn.prepareStatement(SQL);

rs = pstmt.executeQuery();

if(rs.next()) {

return rs.getString(1);

}

} catch (Exception e) {

e.printStackTrace();

}

return ""; //데이터베이스 오류

}

 

public int getNext() {

String SQL = "SELECT bbsID FROM BBS ORDER BY bbsID DESC";

try {

PreparedStatement pstmt = conn.prepareStatement(SQL);

rs = pstmt.executeQuery();

if(rs.next()) {

return rs.getInt(1) + 1;

}

return 1; //첫 버째 게시물인 경우

} catch (Exception e) {

e.printStackTrace();

}

return -1; //데이터베이스 오류

}

 

public int write(String bbsTitle, String userID, String bbsContent) {

String SQL = "INSERT INTO BBS VALUES(?, ?, ?, ?, ?, ?)";

try {

PreparedStatement pstmt = conn.prepareStatement(SQL);

pstmt.setInt(1, getNext());

pstmt.setString(2, bbsTitle);

pstmt.setString(3, userID);

pstmt.setString(4, getDate());

pstmt.setString(5, bbsContent);

pstmt.setInt(6, 1);

return pstmt.executeUpdate();

} catch (Exception e) {

e.printStackTrace();

}

return -1; //데이터베이스 오류

}

public ArrayList<Bbs> getList(int pageNumber){

String SQL = "SELECT * FROM BBS WHERE bbsID < ? AND bbsAvailable = 1 ORDER BY bbsID DESC LIMIT 10";

ArrayList<Bbs> list = new ArrayList<Bbs>();

try {

PreparedStatement pstmt = conn.prepareStatement(SQL);

pstmt.setInt(1, getNext() - (pageNumber - 1) * 10);

rs = pstmt.executeQuery();

while (rs.next()) {

Bbs bbs = new Bbs();

bbs.setBbsID(rs.getInt(1));

bbs.setBbsTitle(rs.getString(2));

bbs.setUserID(rs.getString(3));

bbs.setBbsDate(rs.getString(4));

bbs.setBbsContent(rs.getString(5));

bbs.setBbsAvailable(rs.getInt(6));

list.add(bbs);

}

} catch (Exception e) {

e.printStackTrace();

}

return list;

}

public boolean nextPage(int pageNumber) {

String SQL = "SELECT * FROM BBS WHERE bbsID < ? AND bbsAvailable = 1 ORDER BY bbsID DESC LIMIT 10";

try {

PreparedStatement pstmt = conn.prepareStatement(SQL);

pstmt.setInt(1, getNext() - (pageNumber - 1) * 10);

rs = pstmt.executeQuery();

if(rs.next()) {

return true;

}

} catch (Exception e) {

e.printStackTrace();

}

return false;

 

}

 

//하나의 글 내용을 불러오는 함수 추가

public Bbs getBbs(int bbsID) {  

String SQL = "SELECT * FROM BBS WHERE bbsID = ?"//특정한 아이디에 해당하는 글을 가져오도록 

try {

PreparedStatement pstmt = conn.prepareStatement(SQL);

pstmt.setInt(1, bbsID);

rs = pstmt.executeQuery();

if(rs.next()) {

Bbs bbs = new Bbs();

bbs.setBbsID(rs.getInt(1));

bbs.setBbsTitle(rs.getString(2));

bbs.setUserID(rs.getString(3));

bbs.setBbsDate(rs.getString(4));

bbs.setBbsContent(rs.getString(5));

bbs.setBbsAvailable(rs.getInt(6));

return bbs;   //결과로 나온 6개 변수를 bbs 인스턴스에 넣어 이 함수를 불러온 대상에게 반환

}

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

 

}

 

 

2. view.jsp 생성

실제로 특정한 게시글의 내용을 보여주는 페이지

 

특수문자, 공백 글에 표시되게 기능 구현

로그인 했을 때 수정/삭제 버튼 구현

 

 

 

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%@ page import="java.io.PrintWriter" %>

<%@ page import="bbs.Bbs" %> //데이터베이스를 사용할 수 있게 Bbs를 그대로 가져올 수 있도록 해줌

<%@ page import="bbs.BbsDAO" %>

<!DOCTYPE html>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<meta name="viewport" content="width=device-width", initial-scale="1">

<link rel="stylesheet" href="css/bootstrap.css">

<title>JSP 게시판 웹 사이트</title>

</head>

<body>

<%

String userID = null;

if (session.getAttribute("userID") !=null){

userID = (String) session.getAttribute("userID");

}

int bbsID = 0;

if(request.getParameter("bbsID") !=null){     //매개변수로 넘어온 bbsID라는 매개변수가 존재한다면

bbsID=Integer.parseInt(request.getParameter("bbsID")); //bbsID가 정상적으로 넘어왔다면 bbsID에 담아 처리할 수 있게 함

}

if(bbsID == 0){

PrintWriter script = response.getWriter();

script.println("<script>");

script.println("alert('유효하지 않은 글입니다.')");

script.println("location.href = 'bbs.jsp'");

script.println("</script>");

}

Bbs bbs = new BbsDAO().getBbs(bbsID);    //해당 글의 구체적인 정보를 가져올 수 있도록 함

유효한 정보라면 getBbs라는 구체적인 정보를 bbs에 담을 수 있도록 함

%>

<nav class="navbar navbar-default">

<div class="navbar-header">

<button type="button" class ="navbar-toggle collapsed"

data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">

<span class="icon-bar"></span>

<span class="icon-bar"></span>

<span class="icon-bar"></span>

</button>

<a class="navbar-brand" href="main.jsp">JSP 게시판 웹 사이트</a>

</div>

<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">

<ul class="nav navbar-nav">

<li><a href="main.jsp">메인</a></li>

<li class="active"><a href="bbs.jsp">게시판</a></li>

</ul>

<%

if(userID == null){

%>

<ul class="nav navbar-nav navbar-right">

<li class="dropdown">

<a href="#" class="dropdown-toggle"

data-toggle="dropdown" role="button" aria-haspopup="true"

aria-expanded="false">접속하기<span class="caret"></span></a>

<ul class="dropdown-menu">

<li><a href="login.jsp">로그인</a></li>

<li><a href="join.jsp">회원가입</a></li>

</ul>

</li>

</ul>

<%

} else {

%>

<ul class="nav navbar-nav navbar-right">

<li class="dropdown">

<a href="#" class="dropdown-toggle"

data-toggle="dropdown" role="button" aria-haspopup="true"

aria-expanded="false">회원관리<span class="caret"></span></a>

<ul class="dropdown-menu">

<li><a href="logoutAction.jsp">로그아웃</a></li>

</ul>

</li>

</ul>

<%

}

%>

</div>

</nav>

<div class="container">

<div class="row">

<table class="table table-striped" style="text-align:center; border: 1px solid #dddddd">

<thead>

<tr>

<th colspan="3" style="background-color: #eeeeee; text-align: center;">게시판 글 보기</th>

</tr>

</thead>

<tbody>

<tr>

<td style="width: 20%;">글 제목</td>

<td colspan="2"><%= bbs.getBbsTitle().replaceAll(" ", "&nbsp;").replaceAll("<","&lt;").replaceAll("\n", "<br>")%></td>

</tr>

<tr>

<td>작성자</td>

<td colspan="2"><%= bbs.getUserID() %></td>

</tr>

<tr>

<td>작성일자</td>

<td colspan="2"><%= bbs.getBbsDate().substring(0,11) + bbs.getBbsDate().substring(11,13) + "시" + bbs.getBbsDate().substring(14,16) + "분" %></td>

</tr>

<tr>

<td>내용</td>

<td colspan="2" style="min-height: 200px; text-align: left;"><%= bbs.getBbsContent().replaceAll(" ", "&nbsp;").replaceAll("<","&lt;").replaceAll("\n", "<br>") %></td>

</tr>

</tbody>

</table>

<a href="bbs.jsp" class="btn btn-primary">목록</a>

<%

if(userID !=null && userID.equals(bbs.getUserID())){     //현재 접속자가 해당 글의 작성자와 동일하다면

%>

<a href="update.jsp?bbsID=<%= bbsID %>" class="btn btn-primary">수정</a>

<a onclick="return confirm('정말로 삭제하시겠습니까?')" href="deleteAction.jsp?bbsID=<%= bbsID %>" class="btn btn-primary">삭제</a>

<%

}

%>

</div>

</div>

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>

<script src="js/bootstrap.js"></script>

</body>

</html>