session을 이해하는 회원가입과 탈퇴 로그인 예제

index.jsp

<%@ page contentType="text/html; charset=UTF-8"%>

<%@ page trimDirectiveWhitespaces="true" %>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

String cp = request.getContextPath();

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

</head>

<body>

반갑습니다. 허접 홈페이지 입니다.<br/>

<c:if test="${empty sessionScope.member}">

<a href="<%=cp %>/member/member.kp">회원가입</a>

<a href="<%=cp %>/member/login.kp">로그인</a>

</c:if>

<c:if test="${not empty sessionScope.member}">

${sessionScope.member.userName}님

<a href="<%=cp %>/member/update.kp">정보수정</a>

<a href="<%=cp %>/member/logout.kp">로그아웃</a>

<a href="<%=cp %>/member/delete.kp">회원탈퇴</a>

</c:if>

<br/>

재미있게 놀다 가삼....

</body>

</html>

==================================================================================================================================

<%@ page contentType="text/html; charset=UTF-8"%>

<%@ page trimDirectiveWhitespaces="true" %>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

String cp = request.getContextPath();

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

</head>

<body>

<form action="<%=cp%>/member/login_ok.kp" method="post">

아이디 : <input type="text" name="userId"><br/>

패스워드 : <input type="password" name="userPwd"> <br/>

</form>

</body>

</html>

==================================================================================================================================

created.jsp

<%@ page contentType="text/html; charset=UTF-8"%>

<%@ page trimDirectiveWhitespaces="true" %>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

String cp = request.getContextPath();

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

String.prototype.trim=function(){

var TRIM_PATTERN=/(^\s*)|(\s*$)/g;

return this.replace(TRIM_PATTERN,"");

};

function sendIt(){

var f=document.forms[0];

// 아이디

var str = f.userId.value;

str = str.trim();

if(! /^[a-z][a-z0-9_!@#$%^&*]{4,14}$/i.test(f.userId.value)){

alert("아이디는 영문자로 시작 5~15이내");

f.userId.focus();

return;

}

f.userId.value = str;

//패스워드검사

var str = f.userPwd.value;

str = str.trim();

if(! /(?=.*[_!@#$%^&*]|.*[0-14]).{0,14}$/i.test(f.userPwd.value)){

alert("패스워드는 하나이상의 특수문자를 포함이며 5~15이내 ");

f.userPwd.focus();

return;

}

f.userPwd.value = str;

//패스워드 확인

if(f.userPwd2.value!=f.userPwd.value){

alert("패스워드를 확인해주세요 ");

f.userPwd2.focus();

return;

}

// 이름

var str = f.userName.value;

str = str.trim();

if(! /^[\uac00-\ud7a3]*$/g.test(f.userName.value)){

alert("이름을 제대로 입력하쇼");

f.userName.focus();

return;

}

f.userName.value = str;

//전화번호

if(f.tel1.value==""){

alert("앞번호를 선택하세요");

f.tel1.focus();

return;

}

if(! f.tel2.value){

alert("가운데번호를 입력하세요");

f.tel2.focus();

return;

}

var mode="${mode}";

if(mode=="created")

f.action="<%=cp%>/member/member_ok.kp";

else if(mode=="update")

f.action="<%=cp%>/member/update_ok.kp";

f.submit();

}

</script>

</head>

<body>

</tr>

</table>

<br/>

</td>

</tr>

</td>

</tr>

</td>

</tr>

</td>

</tr>

</select>

<input type="text" name="tel2" size="4" maxlength="4" style="margin-left: 3px" value="${dto.tel2}"> -

</td>

</tr>

</table>

<tr>

</td>

</tr>

</tr>

</table>

</form>

</body>

</html>

==================================================================================================================================

MemberServlet.java

package com.member;

import java.io.IOException;

import javax.servlet.RequestDispatcher;

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("/member/*")

public class MemberServlet extends HttpServlet{

private static final long serialVersionUID = 1L;

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

process(req, resp);

}

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

process(req, resp);

}

protected void forward(HttpServletRequest req,

HttpServletResponse resp, String path)

throws ServletException, IOException {

// 포워딩을 위한 메소드

RequestDispatcher rd=req.getRequestDispatcher(path);

rd.forward(req, resp);

}

protected void process(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

req.setCharacterEncoding("utf-8");

// cp부터 끝까지 주소

String uri=req.getRequestURI();

MemberDAO dao=new MemberDAO();

if(uri.indexOf("member.kp")!=-1) {

req.setAttribute("mode", "created");

forward(req, resp, "/WEB-INF/views/member/created.jsp");

}else if(uri.indexOf("member_ok.kp")!=-1){

MemberDTO dto=new MemberDTO();

dto.setUserId(req.getParameter("userId"));

dto.setUserPwd(req.getParameter("userPwd"));

dto.setUserName(req.getParameter("userName"));

String tel="";

tel=req.getParameter("tel1")+"-"+req.getParameter("tel2")+"-"+req.getParameter("tel3");

dto.setTel(tel);

int result=dao.insertMember(dto);

if(result==1){

String cp=req.getContextPath();

resp.sendRedirect(cp);

return;

}

//가입을 실패하면 다시 가입폼으로

req.setAttribute("mode", "created");

req.setAttribute("msg", "회원가입을 실패했습니다.");

forward(req, resp, "/WEB-INF/views/member/created.jsp");

}else if(uri.indexOf("login.kp")!=-1){

// 로그인 폼

forward(req, resp, "/WEB-INF/views/member/login.jsp");

}else if(uri.indexOf("login_ok.kp")!=-1){

// 로그인 처리

String userId=req.getParameter("userId");

String userPwd=req.getParameter("userPwd");

MemberDTO dto=dao.readMember(userId);

if(dto!=null){ // DB에 로그인 화면에서 입력한 userId의 데이터가 존재하면

if(dto.getUserPwd().equals(userPwd)){ // 존재하는 데이터와 넘어온 데이터가 같으면

//로그인 처리. 세션에 정보를 저장

HttpSession session=req.getSession();

session.setMaxInactiveInterval(20*60); //20*60초 -> 20분 로그인 상태 지속할 수 있게 설정함.

SessionInfo info=new SessionInfo();

info.setUserId(dto.getUserId());

info.setUserName(dto.getUserName());

// member 라는 이름으로 로그인한 사람 저장

session.setAttribute("member", info);

String cp=req.getContextPath();

//로그인 후, 로그아웃 후

//테이블에 추가, 수정, 삭제후에는 리다이렉트

resp.sendRedirect(cp);

return; // 메소드 전체를 빠져나온다.

}

//로그인 실패한 경우

req.setAttribute("msg", "아이디 또는 패스워드가 일치하지 않습니다.");

forward(req, resp, "/WEB-INF/views/member/login.jsp");

}else if(uri.indexOf("logout.kp")!=-1){

// 로그아웃

HttpSession session=req.getSession();

session.removeAttribute("member");

session.invalidate();

String cp=req.getContextPath();

resp.sendRedirect(cp);

}else if(uri.indexOf("update.kp")!=-1){

// 수정 폼

HttpSession session=req.getSession();

SessionInfo info=(SessionInfo)session.getAttribute("member"); // member의 세션 데이터를 SessionInfo에 담아둔다.

String cp=req.getContextPath();

if(info==null){

//로그인이 안된 상태. 로그인 페이지로 포워딩

forward(req, resp, "/WEB-INF/views/member/login.jsp");

return;

}

MemberDTO dto=dao.readMember(info.getUserId());

if(dto==null){

session.invalidate(); // 모든것을 지우고 초기화

resp.sendRedirect(cp);

return;

}

//수정페이지로 포워딩

req.setAttribute("mode", "update");

req.setAttribute("dto", dto);

forward(req, resp, "/WEB-INF/views/member/created.jsp");

}else if(uri.indexOf("update_ok.kp")!=-1){

MemberDTO dto=new MemberDTO();

dto.setUserId(req.getParameter("userId"));

dto.setUserPwd(req.getParameter("userPwd"));

String tel="";

tel=req.getParameter("tel1")+"-"+req.getParameter("tel2")+"-"+req.getParameter("tel3");

dto.setTel(tel);

int result=dao.updateMember(dto);

if(result==1){

String cp=req.getContextPath();

resp.sendRedirect(cp);

return;

}

//수정을 실패하면 다시 가입폼으로

req.setAttribute("mode", "update");

req.setAttribute("msg", "수정을 실패했습니다.");

forward(req, resp, "/WEB-INF/views/member/update.jsp");

}else if(uri.indexOf("delete.kp")!=-1){

HttpSession session=req.getSession();

SessionInfo info=(SessionInfo)session.getAttribute("member");

String cp=req.getContextPath();

if(info==null){ // 로그인 안된 상태

forward(req, resp, "/WEB-INF/views/member/login.jsp");

return;

}

MemberDTO dto=dao.readMember(info.getUserId());

if(dto==null){ //데이터가 없을 때(이미 삭제된경우)

session.invalidate(); // 모든것을 지우고 초기화

resp.sendRedirect(cp);

return;

}

String userId=dto.getUserId();

dao.deleteMember(userId);

session.invalidate();

resp.sendRedirect(cp);

}

==================================================================================================================================

MemberDAO.java

package com.member;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import com.util.DBConn;

public class MemberDAO {

private Connection conn=DBConn.getConnection();

public int insertMember(MemberDTO dto){

int result=0;

PreparedStatement pstmt=null;

String sql;

try{

sql="INSERT INTO join(userId,userPwd,userName,tel) VALUES(?,?,?,?)";

pstmt=conn.prepareStatement(sql);

pstmt.setString(1, dto.getUserId());

pstmt.setString(2, dto.getUserPwd());

pstmt.setString(3, dto.getUserName());

pstmt.setString(4, dto.getTel());

result=pstmt.executeUpdate();

pstmt.close();

}catch(Exception e){

System.out.println(e.toString());

}

return result;

}

public MemberDTO readMember(String userId){

MemberDTO dto=null;

PreparedStatement pstmt=null;

ResultSet rs= null;

String sql;

try{

sql="SELECT userId,userPwd,userName,tel FROM join WHERE userId=?";

pstmt=conn.prepareStatement(sql);

pstmt.setString(1, userId);

rs=pstmt.executeQuery();

if(rs.next()){

dto=new MemberDTO();

dto.setUserId(rs.getString("userId"));

dto.setUserPwd(rs.getString("userPwd"));

dto.setUserName(rs.getString("userName"));

dto.setTel(rs.getString("tel"));

if(dto.getTel()!=null){ //tel이 te1,tel2,tel3으로 합쳐져 있는 것을 수정을 위해 분리하였다. 전화번호 분리

String t[]=dto.getTel().split("-");

if(t.length==3){

dto.setTel1(t[0]);

dto.setTel2(t[1]);

dto.setTel3(t[2]);

}

rs.close();

pstmt.close();

}catch(Exception e){

System.out.println(e.toString());

}

return dto;

}

public int updateMember(MemberDTO dto){

int result=0;

PreparedStatement pstmt=null;

String sql;

try{

sql="UPDATE join SET userPwd=?, tel=? WHERE userId=?";

pstmt=conn.prepareStatement(sql);

pstmt.setString(1,dto.getUserPwd());

pstmt.setString(2, dto.getTel());

pstmt.setString(3, dto.getUserId());

result=pstmt.executeUpdate();

pstmt.close();

}catch(Exception e){

System.out.println(e.toString());

}

return result;

}

public int deleteMember(String userId){

int result=0;

PreparedStatement pstmt=null;

String sql;

try{

sql="DELETE FROM join WHERE userId=?";

pstmt=conn.prepareStatement(sql);

pstmt.setString(1, userId);

result=pstmt.executeUpdate();

pstmt.close();

}catch(Exception e){

System.out.println(e.toString());

}

return result;

}

==================================================================================================================================

MemberDTO.java

package com.member;

public class MemberDTO {

private String userId,userPwd,userName, tel1,tel2,tel3,tel;

public String getUserId() {

return userId;

}

public void setUserId(String userId) {

this.userId = userId;

}

public String getUserPwd() {

return userPwd;

}

public void setUserPwd(String userPwd) {

this.userPwd = userPwd;

}

public String getUserName() {

return userName;

}

public void setUserName(String userName) {

this.userName = userName;

}

public String getTel1() {

return tel1;

}

public void setTel1(String tel1) {

this.tel1 = tel1;

}

public String getTel2() {

return tel2;

}

public void setTel2(String tel2) {

this.tel2 = tel2;

}

public String getTel3() {

return tel3;

}

public void setTel3(String tel3) {

this.tel3 = tel3;

}

public String getTel() {

return tel;

}

public void setTel(String tel) {

this.tel = tel;

}

==================================================================================================================================

SessionInfo.java

package com.member;

//세션에 저장할 객체(DTO형식으로 세션 객체를 저장한다고 생각하면 됨)

public class SessionInfo {

private String userId, userName, roll; //roll은 권한을 위한 변수

public String getUserId() {

return userId;

}

public void setUserId(String userId) {

this.userId = userId;

}

public String getUserName() {

return userName;

}

public void setUserName(String userName) {

this.userName = userName;

}

public String getRoll() {

return roll;

}

public void setRoll(String roll) {

this.roll = roll;

}

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