Jsp 게시판 만들기 - 17. 게시글 보기 기능 구현
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(" ", " ").replaceAll("<","<").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(" ", " ").replaceAll("<","<").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>