JSP 게시판 만들기 - loginAction.jsp (2020.08.27 완성)

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="board.UserDAO"%>
<%@ page import="java.io.PrintWriter"%>
<%
    request.setCharacterEncoding("UTF-8");
%>
<jsp:useBean id="board" class="board.Board" scope="page" />
<jsp:setProperty name="board" property="userID" />
<jsp:setProperty name="board" property="userPassword" />
<!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('이미 로그인이 되어 있습니다.')");
        script.println("location.href='main.jsp'"); //이미 로그인이 되면 또 로그인 못하게 해줌
        script.println("</script>");
    }
    UserDAO userDAO = new UserDAO();
    int result = userDAO.login(board.getUserID(), board.getUserPassword());
    if (result == 1) {
        session.setAttribute("userID", board.getUserID());
        PrintWriter script = response.getWriter();
        script.println("<script>");
        script.println("location.href='main.jsp'");
        script.println("</script>");
    } else if (result == 0) {
        PrintWriter script = response.getWriter();
        script.println("<script>");
        script.println("alert('비밀번호가 틀렸습니다.')");
        script.println("history.back()"); //이전 페이지 즉 로그인페이지로 돌아가게 만듬
        script.println("</script>");
    } else if (result == -1) {
        PrintWriter script = response.getWriter();
        script.println("<script>");
        script.println("alert('존재하지 않는 아이디입니다.')");
        script.println("history.back()"); //이전 페이지 즉 로그인페이지로 돌아가게 만듬
        script.println("</script>");
    } else if (result == -2) {
        PrintWriter script = response.getWriter();
        script.println("<script>");
        script.println("alert('오류가 발생했습니다.')");
        script.println("history.back()"); //이전 페이지 즉 로그인페이지로 돌아가게 만듬
        script.println("</script>");
    }
    %>
 
</body>
 
</html>
 
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