[Servlet] Cookie(쿠키)/ Session(세션)

Coding/JSP

[Servlet] Cookie(쿠키)/ Session(세션)

Soocong 2022. 4. 4. 11:29

Cookie(쿠키)

- 클라이언트 쿠키 폴더에 저장

- 예: 장바구니

Session(세션)

- 서버에 저장

- 예: 로그인/로그아웃

웹 브라우저에서 서버로 어떤 데이터를 요청하면, 서버측에서는 알맞은 로직을 수행한 후 데이터를 웹 브라우저에 응답한 후 서버는 웹 브라우저와의 관계를 종료한다.
연결이 끊어졌을 때 어떤 정보를 지속적으로 유지하기 위한 수단으로 쿠키라는 방식을 사용한다.
쿠키는 서버에서 생성하여 서버가 아닌 클라이언트측에 특정 정보를 저장한다.(4KB 용량 제한)
세션도 쿠키와 마찬가지로 서버와의 관계를 유지하기 위한 수단입니다.
단, 쿠키와 달리 클라이언트의 특정 위치에 저장되는 것이 아니라, 서버상에 객체로 존재한다.
따라서 세션은 서버에서만 접근이 가능하여 보안에 좋고, 데이터 용량 한계가 없다.

[예제] 장바구니 페이지를 만들어서 쿠키를 사용해보자.

09_example.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<!-- 장바구니 저장, 보기, 삭제  -->
	<form action="http://localhost:8181/webTesting/com/java/servlet/Example09_CookieSet" method="post">
		<table>
			<tr>
				<td>
					<img src="./../img/image1.jpg" width="200" height="150" />
				</td>
				<td>
					<img src="./../img/image2.jpg" width="200" height="150" />
				</td>
				<td>
					<img src="./../img/image3.jpg" width="200" height="150" />
				</td>
			</tr>
			<tr>
				<td align="center">
					<input type="checkbox" name="food" value="image1"/>고구마
				</td>
				<td align="center">
					<input type="checkbox" name="food" value="image2"/>옥수수
				</td>
				<td align="center">
					<input type="checkbox" name="food" value="image3"/>블루베리
				</td>	
			</tr>
			<tr>
				<td colspan="3" align="center">
					<input type="submit" value="장바구니"/>
					<input type="reset" value="취소"/>
				</td>
			</tr>
		</table>
		
		<div>
			<a href="http://localhost:8181/webTesting/com/java/servlet/Example09_CookieGet">
				장바구니 보기</a><br /><br />
			<a href="http://localhost:8181/webTesting/com/java/servlet/Example09_CookieDel">
				장바구니 삭제</a>
		</div>
	
	</form>
</body>
</html>

Example09_CoockieSet.java

package com.java.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Example09
 */
public class Example09_CookieSet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Example09_CookieSet() {
        super();
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		String[] food = request.getParameterValues("food");
		System.out.println(food.length);
		
		// sessionScope : context(webTesting) 안에 모든 page에서 공유
		// response : 쿠키 설정(저장), request : 쿠키 읽기
		
		if(food.length != 0) {
			for(int i=0; i<food.length; i++) {
				// key, value
				String key = "food" + (i+1);
				String value = food[i];
				System.out.println(key + "\t" + value);
				
				Cookie cookie = new Cookie(key, value);
				// 쿠키가 살아있는 시간 10분
				cookie.setMaxAge(60*10);  //초*분*시*일 (60*60*24*365)
										  //사용자가 쿠키 폴더에서 지우면 
				response.addCookie(cookie);
			}
		}
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

Example09_CoockieGet.java

package com.java.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Example09_CookieGet
 */

public class Example09_CookieGet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Example09_CookieGet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		Cookie[] cookies = request.getCookies();
		//System.out.println(cookies.length);
		
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();

		out.print("<html>");
		out.print("<head><title></title></head>");
		out.print("<body>");
		
		if(cookies != null) {
			for(int i=0; i<cookies.length;i++) {
				out.print("<h3>" + cookies[i].getName() + "</h3>");
				out.print("<h3>" + cookies[i].getValue() + "</h3>");
			}
			String contextPath = request.getContextPath();
			for(int i=0; i<cookies.length;i++) {
				String imgStr = contextPath+"/img/"+ cookies[i].getValue() + ".jpg";
				System.out.println(imgStr);
				out.print("<img src='"+ imgStr +"' width='200' height='150' />");
			}
		}else {
			out.print("<h3>장바구니가 비었습니다.</h3>");
		}
		
		out.print("</body>");				
		out.print("</html>");				
		out.close();
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

Example09_CoockieDel.java

package com.java.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Example09_CookieDel
 */
@WebServlet("/Example09_CookieDel")
public class Example09_CookieDel extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Example09_CookieDel() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		Cookie[] cookies = request.getCookies();
		if(cookies!=null) {
			for(int i=0; i<cookies.length; i++) {
				// 쿠키를 지운다.
				cookies[i].setMaxAge(0);
				response.addCookie(cookies[i]);
			}
		}
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.print("<html>");
		out.print("<head><title></title></head>");
		out.print("<body>");
		
		out.print("<script type='text/javascript'>");
		out.print("alert('장바구니를 비웠습니다.');");
		out.print("location.href='http://localhost:8181/webTesting/Servlet/09_example.html';");
		out.print("</script>");
		out.print("</body>");				
		out.print("</html>");				
		out.close();
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0">
  <display-name>webTesting</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
	<servlet-name>Example09_CookieSet</servlet-name>
	<servlet-class>com.java.servlet.Example09_CookieSet</servlet-class>	
  </servlet>

  <servlet-mapping>
	<servlet-name>Example09_CookieSet</servlet-name>
	<url-pattern>/com/java/servlet/Example09_CookieSet</url-pattern>
  </servlet-mapping>
  
  <servlet>
	<servlet-name>Example09_CookieGet</servlet-name>
	<servlet-class>com.java.servlet.Example09_CookieGet</servlet-class>	
  </servlet>

  <servlet-mapping>
	<servlet-name>Example09_CookieGet</servlet-name>
	<url-pattern>/com/java/servlet/Example09_CookieGet</url-pattern>
  </servlet-mapping>
  
  <servlet>
	<servlet-name>Example09_CookieDel</servlet-name>
	<servlet-class>com.java.servlet.Example09_CookieDel</servlet-class>	
  </servlet>

  <servlet-mapping>
	<servlet-name>Example09_CookieDel</servlet-name>
	<url-pattern>/com/java/servlet/Example09_CookieDel</url-pattern>
  </servlet-mapping>
  
</web-app>

쿠키 확인

크롬 설정 > 개인정보 및 보안 > 사이트 설정 > 쿠키 및 사이트 데이터 > 모든 쿠키 및 사이트 데이터 보기

선택한 고구마, 옥수수 쿠키를 볼 수 있다

설정한 유효시간인 10분 후 쿠키가 사라졌음을 확인할 수 있다.

고구마, 옥수수, 블루베리 선택 후 장바구니 추가

장바구니 비우기 클릭

비운 후 장바구니 보기 클릭

[예제] 로그인 페이지를 만들어서 세션을 사용해보자.

10_example.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
  <form action="http://localhost:8181/webTesting/com/java/servlet/Example10_SessionSet" method="post">
 	<label>아이디</label>
	<input type="text" name="id"/>
	<br /><br />
	
	<label>비밀번호</label>
	<input type="text" name="pwd"/>
	<br /><br />
   
   	<input type="submit" value="로그인"/>
	<input type="reset" value="취소" />
   </form>
   <br /><br />
   
   <div>
	<a href="http://localhost:8181/webTesting/com/java/servlet/Example10_SessionGet">
		세션 보기</a><br /><br />
	<a href="http://localhost:8181/webTesting/com/java/servlet/Example10_SessionDel">
		로그아웃</a>
	</div>
</body>
</html>

Example10_SessionSet.java

package com.java.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class Example10_SessionSet
 */
public class Example10_SessionSet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Example10_SessionSet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
    /* 웹 브라우저에서 서버로 어떤 데이터를 요청하면, 서버측에서는 알맞은 로직을 수행한 후
     * 데이터를 웹 브라우저에 응답한 후 서버는 웹 브라우저와의 관계를 종료한다. 
     * 연결이 끊어졌을 때 어떤 정보를 지속적으로 유지하기 위한 수단으로 쿠키라는 방식을 사용한다.
     * 쿠키는 서버에서 생성하여 서버가 아닌 클라이언트측에 특정 정보를 저장한다.(4KB 용량 제한)
     * 
     * 세션도 쿠키와 마찬가지로 서버와의 관계를 유지하기 위한 수단입니다. 
     * 단, 쿠키와 달리 클라이언트의 특정 위치에 저장되는 것이 아니라, 서버상에 객체로 존재한다.
     * 따라서 세션은 서버에서만 접근이 가능하여 보안에 좋고, 데이터 용량 한계가 없다.
     */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		String id = request.getParameter("id");
		String pwd = request.getParameter("pwd");
		System.out.println(id + "\t" + pwd);
		
		// 현재 session 이 존재하면 기존 session 리턴하고, 존재하지 않은 새로운 session 리턴
		HttpSession session = request.getSession();
		String msg = "";
		if(session.isNew()) {
			msg= "새로운 세션이 생성";
			
			session.setAttribute("id", id);
			session.setAttribute("pwd", pwd);
		}else {
			msg= "기존 세션이 반환";
		}
		
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.print("<html>");
		out.print("<head><title></title></head>");
		out.print("<body>");
		
		out.print("<script type='text/javascript'>");
		out.print("alert('"+ msg +": 로그인 성공');");
		out.print("location.href='http://localhost:8181/webTesting/Servlet/10_example.html';");
		out.print("</script>");
		out.print("</body>");				
		out.print("</html>");				
		out.close();
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}
}

Example10_SessionGet.java

package com.java.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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;

/**
 * Servlet implementation class Example10_SessionGet
 */
public class Example10_SessionGet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Example10_SessionGet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		HttpSession session = request.getSession();
		
		if(!session.isNew()) {
			String id= (String) session.getAttribute("id");
			String pwd = (String) session.getAttribute("pwd");
			
			System.out.println(id + "\t" + pwd + "\t" + session.getId());
			
			response.setContentType("text/html;charset=utf-8");
			PrintWriter out = response.getWriter();
			out.print("<html>");
			out.print("<head><title></title></head>");
			out.print("<body>");
			
			out.print("<h3> 아이디:" +id+ "</h3>");
			out.print("<h3> 비밀번호:" +pwd+ "</h3>");

			out.print("</body>");				
			out.print("</html>");				
			out.close();
		}
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}
}

Example10_SessionDel.java

package com.java.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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;

/**
 * Servlet implementation class Example10_SessionDel
 */
public class Example10_SessionDel extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Example10_SessionDel() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		if(request.isRequestedSessionIdValid()) {
			System.out.println("세션 아이디가 유효합니다.");
		}else {
			System.out.println("세션 아이디가 유효하지 않습니다.");
		}
		
		HttpSession session = request.getSession();
		
		if(!session.isNew()) {
			session.invalidate();	//세션종료
			
			if(request.isRequestedSessionIdValid()) {
				System.out.println("세션 아이디가 유효합니다.");
			}else {
				System.out.println("세션 아이디가 유효하지 않습니다.");
			}
		}
		
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.print("<html>");
		out.print("<head><title></title></head>");
		out.print("<body>");
		
		out.print("<h3> 로그아웃 되었습니다. </h3>");
		
		out.print("</body>");
		out.print("</html>");
		
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

Example11.java

package com.java.servlet;

import java.io.IOException;
import java.util.Date;

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;

/**
 * Servlet implementation class Example11
 */
@WebServlet("/Example11")
public class Example11 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Example11() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		HttpSession session = request.getSession();
		
		// 세션 생성시간
		long createTime = session.getCreationTime();
		
		// 세션 마지막 접근시간
		long lastTime = session.getLastAccessedTime();
		
		// 사이트 머문 시간 = 마지막 접근시간 - 생성시간 
		long userTime = (lastTime - createTime)/60000;
		
		Date date = new Date(createTime);
		System.out.println("생성시간: "+createTime + "\t" + date);
		System.out.println("마지막 접근시간:" +lastTime + "\t" + new Date(lastTime).toString());
		System.out.println("머문시간:" +userTime);
		
		/*if(userTime < 5) { // 5분이 안되면 세션자동으로 끊어준다.
			session.invalidate();
		}*/
		
		int max = session.getMaxInactiveInterval() / 60; // 30분부여 - 서버
		System.out.println(max + "분");
		
		// 액션이 없을 경우 세션 시간 설정으로 자동 종료
		if(request.isRequestedSessionIdValid()) {
			System.out.println("세션 아이디가 유효합니다.");
		}else {
			System.out.println("세션 아이디가 유효하지 않습니다.");
		}
		
		// 액션(마우스나 키보드)이 없을때 세션 시간 설정으로 자동 종료
		session.setMaxInactiveInterval(60); 
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

세션 테스트 클릭

Example11.java

package com.java.servlet;

import java.io.IOException;
import java.util.Date;

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;

/**
 * @author : 김소현
 * @Date : 2020. 6. 10.
 * @Description :
 */

public class Example11 extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Example11() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		HttpSession session = request.getSession();
		
		// 세션 생성시간
		long createTime = session.getCreationTime();
		
		// 세션 마지막 접근시간
		long lastTime = session.getLastAccessedTime();
		
		// 사이트 머문 시간 = 마지막 접근시간 - 생성시간 
		long userTime = (lastTime - createTime)/60000;
		
		Date date = new Date(createTime);
		System.out.println("생성시간: "+createTime + "\t" + date);
		System.out.println("마지막 접근시간:" +lastTime + "\t" + new Date(lastTime).toString());
		System.out.println("머문시간:" +userTime);
		
		/*if(userTime < 5) { // 5분이 안되면 세션자동으로 끊어준다.
			session.invalidate();
		}*/
		
		int max = session.getMaxInactiveInterval() / 60; // 30분부여 - 서버
		System.out.println(max + "분");
		
		// 액션이 없을 경우 세션 시간 설정으로 자동 종료
		if(request.isRequestedSessionIdValid()) {
			System.out.println("세션 아이디가 유효합니다.");
		}else {
			System.out.println("세션 아이디가 유효하지 않습니다.");
		}
		
		// 액션(마우스나 키보드)이 없을때 세션 시간 설정으로 자동 종료
		session.setMaxInactiveInterval(60); 
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

ContextLifeCycle.java

package com.java.contextLifeCycle;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

/**
 * @author : 김소현
 * @Date : 2020. 6. 10.
 * @Description : 웹 어플리케이션(webTesting / context) 생명주기
 * 
 *  
 * <listener>
 * 	<listener-class>com.java.contextLifeCycle.ContextListener</listener-class>
 * </listener>
 *  
 */
public class ContextListener implements ServletContextListener{
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        System.out.println("contextInitialized~~~~~~~~~~~~~~~~~~~~~~~");
    }
    
    @Override
    public void contextDestroyed(ServletContextEvent sce) {
	System.out.println("contextDestroyed~~~~~~~~~~~~~~~~~~~~~~~");
    }
}

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현재글[Servlet] Cookie(쿠키)/ Session(세션)

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