JSP 게시판 만들기 - deleteAction.jsp(2020.08.27 완성)

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<%@ 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">
<!-- 뷰포트 -->
<meta name="viewport" content="width=device-width" initial-scale="1">
<title>프로젝트 게시판 웹사이트</title>
 
</head>
 
<body>
 
    <%
        String userID = null; //로그인이 된 유저는 로그인, 회원가입 페이지에 못들어오게 해야함
    if (session.getAttribute("userID") != null) {
        userID = (String) session.getAttribute("userID"); //해당 세션값 넣어줌 
    }
    if (userID == null) {
        PrintWriter script = response.getWriter();
        script.println("<script>");
        script.println("alert('로그인이 필요합니다.')");
        script.println("location.href='login.jsp'"); //이미 로그인이 되면 또 로그인 못하게 해줌
        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('선택한 글이 없습니다.')");
        script.println("location.href='bbs.jsp'"); //이미 로그인이 되면 또 로그인 못하게 해줌
        script.println("</script>");
    }
    Bbs bbs = new BbsDAO().getBbs(bbsID);
    if (!userID.equals(bbs.getUserID())) {
        PrintWriter script = response.getWriter();
        script.println("<script>");
        script.println("alert('이 글에 대한 권한이 없습니다.')");
        script.println("location.href='bbs.jsp'"); //이미 로그인이 되면 또 로그인 못하게 해줌
        script.println("</script>");
    }
    //권한이 있을 때 성공적으로 넘어온다음 bbsID를 매개변수로 받아와서 삭제
    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()"); //이전 페이지 즉 로그인페이지로 돌아가게 만듬
            script.println("</script>");
        } else {
            PrintWriter script = response.getWriter();
            script.println("<script>");
            script.println("location.href='bbs.jsp'");
            script.println("</script>");
        }
    }
    %>
 
</body>
 
</html>
 
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