1676
No
login.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>로그인창</title>
</head>
<body>
<form name="frmLogin" method="post" action="loginTest" encType="utf-8">
아이디 :<input type="text" name="id"><br>
비밀번호:<input type="password" name="pw"><br>
<input type="submit" value="로그인">
<input type="reset" value="다시입력">
</form>
</body>
</html>
LoginVO.java
public class LoginVO {
private String id;
private String sessionid;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getSessionid() {
return sessionid;
}
public void setSessionid(String sessionid) {
this.sessionid = sessionid;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
LoginVO other = (LoginVO) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
return true;
}
}
LoginTest.java
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@WebServlet("/loginTest")
public class LoginTest extends HttpServlet{
//전역변수
public static List<LoginVO> userList=new ArrayList<LoginVO>();
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");
PrintWriter out=response.getWriter();
HttpSession session=request.getSession();
String id=request.getParameter("id");
String pw=request.getParameter("pw");
// 로그인 성공시
if(pw.equals("1111")) {
System.out.println(" session.getId() :" + session.getId());
LoginImpl loginUser =new LoginImpl(id, pw, session.getId());
LoginVO loginVO=new LoginVO();
session.setAttribute("loginUser", loginUser);
loginVO.setId(id);
loginVO.setSessionid(session.getId());
userList.add(loginVO);
}else {
//로그인 실패시 로그인 페이지로 리다이렉트
response.sendRedirect("login.html");
}
out.print("<html><body>");
out.print("현재 접속 아이디 : "+id+"<br>");
userList(out); //접속자 중복 제거 및 접속자 목록
out.println("<a href='logout.do?id=" + id + "'>로그아웃 </a><br>");
out.println("세션 유효 시간 : " + session.getMaxInactiveInterval() + "<br>");
out.print("</body></html>");
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");
PrintWriter out=response.getWriter();
HttpSession session=request.getSession();
out.print("<html>");
out.println("<head>");
out.println("<script type='text/javascript'>");
out.println("setTimeout('history.go(0);', 3000)"); //3초마다
out.println("</script>");
out.println("</head>");
out.print("<body>");
userList(out); //접속자 중복 제거 및 접속자 목록
LoginImpl loginUser =(LoginImpl)session.getAttribute("loginUser");
if(loginUser==null) {
out.println("<a href='login.html'>로그인 </a><br>");
}else{
out.println("<a href='logout.do?id=" + loginUser.id + "'>로그아웃 </a><br>");
}
out.println("세션 유효 시간 : " + session.getMaxInactiveInterval() + "<br>");
out.print("</body></html>");
}
//접속자 중복 제거 및 접속자 목록
private void userList(PrintWriter out) {
//중복 아이디 제거
HashSet<LoginVO> hs = new HashSet<LoginVO>(userList);
userList = new ArrayList<LoginVO>(hs);
if(userList!=null &&userList.size()>0) {
out.println("*** 접속 자 목록 *** <br>");
for(int i=0; i<userList.size(); i++) {
if(userList.get(i)==null || userList.get(i).equals("")) {
userList.remove(i);
LoginImpl.loginUserCount--;
}else {
out.println(userList.get(i).getId()+"<br>");
}
}
out.print("총 로그인 접속자수는 "+ LoginImpl.loginUserCount + "<br>");
out.print("<a href='loginTest'>접속자 목록</a><br>");
System.out.println("userList(PrintWriter out) userList size : " +userList.size());
}else {
out.print("총 로그인 접속자수는 0 <br>");
}
}
}
LoginImpl.java
@WebListener 해주면 HttpSessionListener 는 실시간으로 세션을 상태를 created , destroyed 반영해 준다.
import java.util.List;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
@WebListener
public class LoginImpl implements HttpSessionListener {
String id;
String pw;
String sessionid;
static int loginUserCount=0;
public LoginImpl() {
}
public LoginImpl(String id, String pw, String sessionid) {
this.id=id;
this.pw=pw;
this.sessionid=sessionid;
}
@Override
public void sessionCreated(HttpSessionEvent se) {
System.out.println("세션 생성");
++loginUserCount;
System.out.printf("생성된 SESSIONID %s \n", se.getSession().getId());
System.out.printf("로그인된 사용자 수 : %d \n", loginUserCount);
}
@Override
public void sessionDestroyed(HttpSessionEvent se) {
System.out.println("세션 소멸");
System.out.printf("세션 소멸된 아이디 SESSIONID %s \n", se.getSession().getId());
List<LoginVO> userList=LoginTest.userList;
//접소자 목록에서 제거
if(userList!=null && userList.size()>0) {
for(int i=0; i<userList.size(); i++) {
if(userList.get(i)!=null || userList.get(i).getSessionid().equals(se.getSession().getId())){
userList.remove(i);
LoginImpl.loginUserCount--;
}
}
}
System.out.printf("로그인된 사용자 수 : %d \n", loginUserCount);
}
}
LogOutServlet.java
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/logout.do")
public class LogOutServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String id = request.getParameter("id");
if(id!=null){
List<LoginVO> userList=LoginTest.userList;
if(userList!=null && userList.size()>0) {
System.out.println("id 제거 : " + id);
for(int i=0; i<userList.size(); i++) {
System.out.println("userList.get(i) : " +userList.get(i));
if(userList.get(i).equals(id)) {
userList.remove(i);
}
}
}
System.out.println("userList size : " +userList.size());
}
request.getSession().invalidate();
response.sendRedirect("login.html");
}
}
web.xml
테스트를 위해 세션유지시간을 1분으로 설정한다.
<session-config> <session-timeout>1</session-timeout> </session-config>
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