Jsp 게시판 만들기 - 18. 게시글 수정/삭제 기능구현 <delete 함수 공부해서 내용 추가>
1. BbsDAO.java
함수 추가(수정/삭제 기능)
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;
}
public Bbs getBbs(int bbsID) {
String SQL = "SELECT * FROM BBS WHERE bbsID = ?";
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;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
//여기부터 추가(수정/삭제)
public int update(int bbsID, String bbsTitle, String bbsContent) {
String SQL = "UPDATE BBS SET bbsTitle = ?, bbsContent = ? WHERE bbsID = ?";
try {
PreparedStatement pstmt = conn.prepareStatement(SQL);
pstmt.setString(1, bbsTitle);
pstmt.setString(2, bbsContent);
pstmt.setInt(3, bbsID);
return pstmt.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
return -1; //데이터베이스 오류
}
public int delete(int bbsID) {
String SQL = "UPDATE BBS SET bbsAvailable = 0 WHERE bbsID = ?";
//글을 삭제하더라도 글에 대한 정보가 남아 있을 수 있도록 bbsAvailable 값만 0으로 바꾸는 걸로 delete함수 구현
// 뭔 말인지 모르겠음 다시 찾아서 정보 추가
try {
PreparedStatement pstmt = conn.prepareStatement(SQL);
pstmt.setInt(1, bbsID);
return pstmt.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
return -1; //데이터베이스 오류
}
}
}
}
2. Update.jsp 생성(Write.jsp 내용복사해서 수정)
글수정
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.io.PrintWriter" %>
<%@ page import="bbs.Bbs" %>
<%@ 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">
<link rel="stylesheet" href="css/custom.css">
<title>JSP 게시판 웹 사이트</title>
</head>
<body>
<%
String userID = null;
if (session.getAttribute("userID") !=null){
userID = (String) session.getAttribute("userID");
}
if(userID == null){
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("alert('로그인을 하세요. ')");
script.println("location.href = 'login.jsp'");
script.println("</script>");
}
int bbsID = 0;
if(request.getParameter("bbsID") !=null){
bbsID=Integer.parseInt(request.getParameter("bbsID"));
}
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);
if(!userID.equals(bbs.getUserID())){
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("alert('권한이 없습니다. ')");
script.println("location.href = 'bbs.jsp'");
script.println("</script>");
}
%>
<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>
<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="contatiner">
<div class="row">
<form method="post" action="updateAction.jsp?bbsID=<%= bbsID %>">
<table class="table table-striped" style="text-align:center; border: 1px solid #dddddd">
<thead>
<tr>
<th colspan="2" style="background-color: #eeeeee; text-align: center;">게시판 글수정 양식</th>
</tr>
</thead>
<tbody>
<tr>
<td><input type="text" class="form-control" placeholder="글 제목" name="bbsTitle" maxlength="50" value="<%= bbs.getBbsTitle() %>"></td> //수정 전 제목을 볼 수 있게 해줌
</tr>
<tr>
<td><textarea class="form-control" placeholder="글 내용" name="bbsContent" maxlength="2048" style="height:350px;"><%= bbs.getBbsContent()%></textarea></td> ///수정 전 내용을 볼 수 있께
</tr>
</tbody>
</table>
<input type="submit" class="btn btn-primary pull-right" value="글수정">
</form>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script src="js/bootstrap.js"></script>
</body>
</html>
}3.
3. updateAction.jsp 생성(writeAction.jsp 내용복사 후 수정)
글수정 기능
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import = "bbs.BbsDAO" %>
<%@ page import = "bbs.Bbs" %>
<%@ page import = "java.io.PrintWriter" %>
<% request.setCharacterEncoding("UTF-8"); %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP 게시판 웹 사이트</title>
</head>
<body>
<%
String userID = null;
if(session.getAttribute("userID") !=null){
userID = (String) session.getAttribute("userID");
}
if(userID == null){
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("alert('로그인을 하세요. ')");
script.println("location.href = 'login.jsp'");
script.println("</script>");
}
int bbsID = 0;
if(request.getParameter("bbsID") !=null){
bbsID=Integer.parseInt(request.getParameter("bbsID"));
}
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);
if(!userID.equals(bbs.getUserID())){
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("alert('권한이 없습니다. ')");
script.println("location.href = 'bbs.jsp'");
script.println("</script>");
} else{
if(request.getParameter("bbsTitle") == null || request.getParameter("bbsContent") == null
|| request.getParameter("bbsTitle").equals("") || request.getParameter("bbsContent").equals("")){
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("alert('입력되지 않은 항목이 있습니다.')");
script.println("history.back()");
script.println("</script>");
} else{
BbsDAO bbsDAO = new BbsDAO();
int result = bbsDAO.update(bbsID, request.getParameter("bbsTitle"), request.getParameter("bbsContent"));
if(result == -1){
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("alert('글 수정에 실패했습니다.')");
script.println("history.back()");
script.println("</script>");
}
else {
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("location.href = 'bbs.jsp'");
script.println("</script>");
}
}
}
%>
</body>
</html>
4. deleteAction.jsp 생성
글 삭제 기능
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import = "bbs.BbsDAO" %>
<%@ page import = "bbs.Bbs" %>
<%@ page import = "java.io.PrintWriter" %>
<% request.setCharacterEncoding("UTF-8"); %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP 게시판 웹 사이트</title>
</head>
<body>
<%
String userID = null;
if(session.getAttribute("userID") !=null){
userID = (String) session.getAttribute("userID");
}
if(userID == null){
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("alert('로그인을 하세요. ')");
script.println("location.href = 'login.jsp'");
script.println("</script>");
}
int bbsID = 0;
if(request.getParameter("bbsID") !=null){
bbsID=Integer.parseInt(request.getParameter("bbsID"));
}
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);
if(!userID.equals(bbs.getUserID())){
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("alert('권한이 없습니다. ')");
script.println("location.href = 'bbs.jsp'");
script.println("</script>");
} else{
BbsDAO bbsDAO = new BbsDAO();
int result = bbsDAO.delete(bbsID);
if(result == -1){
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("alert('글 삭제에 실패했습니다. ')");
script.println("history.back()");
script.println("</script>");
}
else {
PrintWriter script = response.getWriter();
script.println("<script>");
script.println("location.href = 'bbs.jsp'");
script.println("</script>");
}
}
%>
</body>
</html>
5. 삭제 여부를 다시 한번 묻는 창 띄우기
view.jsp 수정
"return confirm('정말로 삭제하시겠습니까?')"
추가
}