記錄

세션(session) 본문

Web/JSP

세션(session)

surhommejk 2017. 12. 4. 15:43

정리

1) WAS 상에 만들어지는 객체이므로 보안에 강하고 용량에 제한이 없다

2) 브라우저 하나당 유니크한 객체 1개를 자동으로 jsp 컨테이너가 만든다














session을 이용한 회원 로그인 예제 실습


login.html

<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
</head>
<body>
    <form action="loginCK.jsp" method="post">
        아 이 디 : <input type="text" name="id" size="10"><br />
        비밀번호 : <input type="password" name="pw" size="10"><br/>
        <input type="submit" value="login">
    </form>
</body>
</html>







loginCK.jsp

<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>

<%
String id = request.getParameter("id");
String pw = request.getParameter("pw");

if ((id.equals("abcde")) && (pw.equals("12345"))) {
session.setAttribute("id", id);
response.sendRedirect("welcom.jsp");
} else {
response.sendRedirect("login.html");
}       
%>


</body>
</html>





welcom.jsp

<%@page import="java.util.Enumeration"%>
<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>

    <%
        Enumeration enu = session.getAttributeNames();

        while (enu.hasMoreElements()) {
            String sName = enu.nextElement().toString();
            String sValue = (String) session.getAttribute(sName);

            if (sName.equals("abcde")) {
                out.print(sName + "님 환영합니다. <br/>" );
            }
        }
        
    %>
    
    <a href="logout.jsp">로그아웃</a>



</body>
</html>





logout.jsp

<%@page import="java.util.Enumeration"%>
<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
    <%
        Enumeration enu = session.getAttributeNames();
    
        while(enu.hasMoreElements()){
            String sName = enu.nextElement().toString();
            String sValue = (String)session.getAttribute(sName);
            
            if(sValue.equals("abcde")){
                session.removeAttribute(sName);
            }
            
        }
    
    %>

    <a href="sessionTest.jsp">session test로 이동합니다</a>


</body>
</html>





sessionTest.jsp

<%@page import="java.util.Enumeration"%>
<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>

    <%
        Enumeration enu = session.getAttributeNames();
    
    
    while(enu.hasMoreElements()){
        
        String sName = enu.nextElement().toString();
        String sValue = (String) session.getAttribute(sName);
        
        out.print("sName : " + sName + "<br/>");
        out.print("sValue : " + sValue + "<br/>");
        
    }

    %>
    
    출력할 session이 없습니다.
    

</body>
</html>





------------------------------------------------------------------------------------------------------------------------------




+ 수업내용 추가







session은 브라우저 단위로 생성되어 관리된다





invalidate

public void invalidate()

Invalidates this session then unbinds any objects bound to it.

Throws: java.lang.IllegalStateException - if this method is called on an already invalidated session


>> session을 비우는 것이 아닌 '소멸'시킨다. (자체 소멸)


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