Servlet을 사용하기 위한 세팅하고,
CookieGetServlet.java
/*
* Cookie
* 1. 상태정보(Status)를 클라이언트에 저장하는 메커니즘
* 2. 클라이언트에 저장하기 때문에 서버에 부하를 줄일 수는 있지만, 그만큼 보안에 취약하다.
* 3. 도메인당 300개까지 저장가능
* 4. 요새 대부분의 브라우저는 쿠키를 설정하지 못하도록 하는 제약이 있다.
* 5. 브라우저 메모리 혹은 OS 파일에 저장가능
* 6. 기본저장은 브라우저 메모리이기 때문에, 브라우저를 종료하면 자동으로 쿠키는 폐기됨
* 7. 쿠키만료시간을 지정하면 지정된 시간까지 OS 파일에 저장된다.
*
* Cookie 생성자
* javax.servlet.http.Cookie;
* public Cookie(java.lang.String name, java.lang.String value)
*
* 주요메소드
* 1) response.addCookie(cookie인스턴스);
* 2) request.getCookies()
* 3) setMaxAge(second)
* 4) getMaxAge()
* 5) setValue(value)
* 6) getValue()
* 7) getName()
* 8) length
*/
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;
public class CookieGetServlet extends HttpServlet{
/*@Override
public void service(ServletRequest req, ServletResponse res)
throws ServletException, IOException{
HttpServletRequest request = (HttpServletRequest)req;
if(request.getMethod().equalsIgnoreCase("POST")){
this.doPost((HttpServletRequest)req, (HttpServletResponse)res);
}else if(request.getMethod().equalsIgnoreCase("GET")){
this.doGet((HttpServletRequest)req, (HttpServletResponse)res);
}
}*/
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<h1>Cookie 추출</h1>");
Cookie [] array = req.getCookies();
if(array != null && array.length > 0){
out.println("<p>다음과 같은 쿠키 정보가 전달됐습니다.</p>");
out.println("<ul>");
for(int i = 0 ; i < array.length ; i++){
out.println("<li>Cookie Name : " + array[i].getName() + "</li>");
out.println("<li>Cookie Value : " + array[i].getValue() + "</li>");
}
out.println("</ul>");
}else{ //Cookie 가 없다면
out.println("<font color='red' size='6'>전달된 Cookie 가 없습니다.</font>");
}
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
this.doGet(req, resp);
}
}
CookieSetServlet.java
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;
public class CookieSetServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
Cookie c1 = new Cookie("discount", "20");
Cookie c2 = new Cookie("item", "sports");
res.setContentType("text/html;charset=utf-8");
res.addCookie(c1);
c2.setMaxAge(60 * 60 * 3); //3시간
res.addCookie(c2);
PrintWriter out = res.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<h1>Cookie 추출완료</h1>");
out.println("</body></html>");
out.close();
}
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
this.doGet(req, res);
}
}
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0"
metadata-complete="true">
<display-name>Welcome to 0613 Web Project </display-name>
<servlet>
<servlet-class>CookieGetServlet</servlet-class>
<servlet-name>CookieGet</servlet-name>
</servlet>
<servlet>
<servlet-class>CookieSetServlet</servlet-class>
<servlet-name>CookieSet</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>CookieGet</servlet-name>
<url-pattern>/servlet/CookieGet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CookieSet</servlet-name>
<url-pattern>/servlet/CookieSet</url-pattern>
</servlet-mapping>
</web-app>
브라우저켜서
http://localhost/0613/servlet/CookieGet 해서
http://localhost/0613/servlet/CookieSet 으로 쿠키를 셋 해주고
http://localhost/0613/servlet/CookieGet 다시 오면 두개의 쿠키정보가 나온다. 브라우저 종료 후,
http://localhost/0613/servlet/CookieGet 오면 쿠키가 하나사라진 것을 볼 수 있다.
이유는 c2에는 유효시간을 주어 유효시간동안 쿠키가 남아있지만, c1은 브라우저를 종료하면 사라진다.
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쇼핑몰 쿠키
product.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>상품페이지</title>
</head>
<body>
<h1>상품 목록</h1>
<form action="/0613/servlet/CartSave" method="post">
<input type="radio" name="product" value="Computer">Computer<br />
<input type="radio" name="product" value="Sonata">Sonata<br />
<input type="radio" name="product" value="Keyboard">Keyboard<br />
<input type="radio" name="product" value="Book">Book<br />
<input type="submit" value="담기">
</form>
</body>
</html>
ShoppingCartCookiesServlet.java
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;
public class ShoppingCartCookieServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<h1>장바구니 리스트</h1>");
Cookie [] array = req.getCookies();
if(array != null && array.length > 0){ //Cookie 가 있다면
for(Cookie c : array)
out.println(c.getName() + " --> " + c.getValue() + "<br />");
}else{
out.println("<p style='color:red;font-size:1.5em;'>");
out.println("장바구니가 비었습니다.</div>");
}
out.println("<a href='/0613/product.html'>상품 선택 페이지</a>");
out.println("<a href='/0613/servlet/CartDelete'>장바구니 비우기</a>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
this.doGet(req, resp);
}
}
CartSaveServlet.java
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;
public class CartSaveServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
String product = req.getParameter("product");
Cookie [] array = req.getCookies(); //기존의 쿠키
Cookie c = null;
if(array == null || array.length == 0){ //기존의 쿠키가 없다면
c = new Cookie("product", product);
}else{
c = new Cookie("product" + (array.length + 1), product);
}
resp.addCookie(c);
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<a href='/0613/servlet/ShoppingCartCookie'>");
out.println("장바구니 보기</a>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
this.doGet(req, resp);
}
}
CartDeleteServlet.java
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;
public class CartDeleteServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<h1>장바구니 비우기</h1>");
Cookie [] array = req.getCookies();
if(array != null){
for(Cookie c : array) {
c.setMaxAge(1); //1초
resp.addCookie(c);
}
}else{
out.println("<div style='color:red;font-size:1.5em;'>");
out.println("장바구니는 이미 비어있음</div>");
}
out.println("<a href='/0613/product.html'>상품선택페이지</a>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
this.doGet(req, resp);
}
}
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0"
metadata-complete="true">
<display-name>Welcome to 0613 Web Project </display-name>
<servlet>
<servlet-class>CookieGetServlet</servlet-class>
<servlet-name>CookieGet</servlet-name>
</servlet>
<servlet>
<servlet-class>CookieSetServlet</servlet-class>
<servlet-name>CookieSet</servlet-name>
</servlet>
<servlet>
<servlet-class>ShoppingCartCookieServlet</servlet-class>
<servlet-name>ShoppingCartCookie</servlet-name>
</servlet>
<servlet>
<servlet-class>CartSaveServlet</servlet-class>
<servlet-name>CartSave</servlet-name>
</servlet>
<servlet>
<servlet-class>CartDeleteServlet</servlet-class>
<servlet-name>CartDelete</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>CookieGet</servlet-name>
<url-pattern>/servlet/CookieGet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CookieSet</servlet-name>
<url-pattern>/servlet/CookieSet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ShoppingCartCookie</servlet-name>
<url-pattern>/servlet/ShoppingCartCookie</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartSave</servlet-name>
<url-pattern>/servlet/CartSave</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartDelete</servlet-name>
<url-pattern>/servlet/CartDelete</url-pattern>
</servlet-mapping>
</web-app>
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SessionTestServlet.java
/*
* Session Tracking
*
* 1. http protocol은 stateless protocol 즉 상태를 저장하지 않는 프로토콜이다.
* 2. 클라이언트가 웹 서버에 요청하고 응답을 받으면 즉시 연결과 정보를 끊는 방식이다.
* 3. http 프로토콜의 문제점을 극복하기 위해서 사용자의 상태 정보를 관리하는 매커니즘이 필요
* 4. 세션트래킹(세션관리)의 방법
* 1)HttpSession 클래스를 이용한 세션 처리 방법
* 2)Cookie 를 이용한 쿠리 처리 방법
*
* 5. 세션이란?
* - 사용자의 상태정보를 웹 서버의 메모리에 저장하는 매커니즘을 의미
* - 세션 정보는 클라이언트가 웹 서버에 접근해서 종료할 때까지(브라우저를 종료할 때까지) 유지
* - 상태 정보를 서버에 저장하기 때문에 서버의 부하가 클 수 있다.
* - time-out 제한을 두어서 일정시간(기본 30분)동안 요청이 없으면, 서버는 세션 정보를 폐기
*
* 6. 주요 메소드
* 1)request.getSession(), request.getSession(true)
* - 만일 세션이 없으면 새로 생성하고, 있으면 생성된 세션을 참조
* - 일반적으로 세션을 처음 생성하는 서블릿에서 사용
* 2)request.getSession(false)
* - 만일 세션이 없으면 null 값을 리턴하고, 있으면 생성된 세션을 참조
* - 일반적으로 세션을 사용해야 하는 경우에 사용
* 3) session.getId()
* 4) session.setAttribute(key, value)
* 5) session.getAttribuet(key)
* 6) session.removeAttribute(key)
* 7) session.setMaxInactiveInterval(second)
* 8) session.getMaxInactiveInterval()
* 9) session.invalidate()
*
* 7. 세션을 제거하는 방법
* 1) time-out을 지정하는 방법
* - session.setMaxInactiveInterval(second)
* session.setMaxInactiveInterval(60 * 60 * 24); //24시간
* -web.xml 에서
* <web-app>
* <session-config> 단위는 분단위
* <session-timeout>60</session-timeout>
* </session-config>
* </web-app>
* 2) 즉시 제거하는 방법
* - invalidate()
* session.invalidate()
* 3) 세션에 특정 값만을 지울 때
* removeAttribute(key)
* session.removeAttribute(key)
*/
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;
public class SessionTestServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
res.setContentType("text/html;charset=utf-8");
PrintWriter out = res.getWriter();
HttpSession session = null;
String msg = null;
String param = req.getParameter("comm");
if(param.equals("create")){
session = req.getSession(); //req.getSession(true);
if(session.isNew()){
msg = "방금 세션이 생성됐습니다.";
}else{
msg = "이미 세션이 생성되어 있습니다.";
}
}else if(param.equals("destroy")){
session = req.getSession(false);
if(session != null) {
session.invalidate();
msg = "세션이 방금 삭제됐습니다.";
}else{
msg = "사용할 수 없는 명령입니다.";
}
}
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<h1>처리 결과 : " + msg + "</h1>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
this.doGet(req, res);
}
}
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0"
metadata-complete="true">
<display-name>Welcome to 0613 Web Project </display-name>
<servlet>
<servlet-class>SessionTestServlet</servlet-class>
<servlet-name>SessionTest</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>SessionTest</servlet-name>
<url-pattern>/servlet/SessionTest</url-pattern>
</servlet-mapping>
</web-app>
//실행은 http://localhost/0613/servlet/SessionTest?comm=destroy 해보고
http://localhost/0613/servlet/SessionTest?comm=create 해보고
http://localhost/0613/servlet/SessionTest?comm=destroy 해봄.
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CountServlet.java
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;
public class CountServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
res.setContentType("text/html;charset=utf-8");
PrintWriter out = res.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<h1>누적시킬 숫자를 입력하세요.</h1>");
out.println("<form method='post'>");
out.println("<p><input type='number' name='number'></p>");
out.println("<p><input type='submit' value='전송'></p>");
out.println("</form>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
HttpSession session = req.getSession();
if(session.isNew()){
session.setAttribute("number", new int[]{0});
}
int [] sum = (int [])session.getAttribute("number");
int su = Integer.parseInt(req.getParameter("number"));
sum[0] += su;
res.setContentType("text/html;charset=utf-8");
PrintWriter out = res.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<h3>누적된 값 : " + sum[0] + "</h3>");
out.println("Session ID : " + session.getId() + "<br />");
out.print("Session 생성시간 : ");
out.println(new java.util.Date(session.getCreationTime()) + "<br />");
out.println("<a href='/0613/servlet/Count'>이전페이지</a>");
out.println("</body></html>");
out.close();
}
}
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0"
metadata-complete="true">
<display-name>Welcome to 0613 Web Project </display-name>
<servlet-class>CountServlet</servlet-class>
<servlet-name>Count</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>Count</servlet-name>
<url-pattern>/servlet/Count</url-pattern>
</servlet-mapping>
</web-app>
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session으로 쇼핑몰 .
product1.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>상품페이지</title>
</head>
<body>
<h1>상품 목록</h1>
<form action="/0613/servlet/CartSaveSession" method="post">
<input type="radio" name="product" value="Computer">Computer<br />
<input type="radio" name="product" value="Sonata">Sonata<br />
<input type="radio" name="product" value="Keyboard">Keyboard<br />
<input type="radio" name="product" value="Book">Book<br />
<input type="submit" value="담기">
</form>
</body>
</html>
ShoppingSaveSessionServlet.java
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class CartSaveSessionServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
String product = req.getParameter("product");
HttpSession session = req.getSession(true);
ArrayList<String> cart = (ArrayList<String>)session.getAttribute("product");
if(cart == null){
cart = new ArrayList<String>();
cart.add(product);
session.setAttribute("product", cart);
}else{
cart.add(product);
}
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body><h1>장바구니추가</h1>");
out.println("<a href='/0613/servlet/ShoppingCartSession'>");
out.println("장바구니 보기</a>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
this.doGet(req, resp);
}
}
ShoppingCartSessionServlet.java
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class ShoppingCartSessionServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<h1>장바구니 리스트</h1>");
HttpSession session = req.getSession(false);
session.setMaxInactiveInterval(60 * 15); //15분
if(session != null){
ArrayList<String> cart = (ArrayList<String>)session.getAttribute("product");
out.println("<ul>상품목록");
for(int i = 0 ; i < cart.size() ; i++){
out.println("<li>" + cart.get(i) + "</li>");
}
out.println("</ul>");
}else{
out.print("<div style='color:red;font-size:1.5em;'>");
out.println("세션이 없습니다.</div>");
}
out.println("<a href='/0613/product1.html'>상품 선택 페이지</a>");
out.println("<a href='/0613/servlet/CartDeleteSession'>장바구니 비우기</a>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
this.doGet(req, resp);
}
}
CartDeleteSessionServlet.java
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;
public class CartDeleteSessionServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body>");
out.println("<h1>장바구니 비우기</h1>");
HttpSession sesson = req.getSession(false);
if(sesson != null) sesson.invalidate();
else{
out.println("<div style='color:red;font-size:1.5em;'>");
out.println("세션이 없습니다.</div>");
}
out.println("<a href='/0613/product1.html'>상품선택페이지</a>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
this.doGet(req, resp);
}
}
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0"
metadata-complete="true">
<display-name>Welcome to 0613 Web Project </display-name>
<servlet>
<servlet-class>CookieGetServlet</servlet-class>
<servlet-name>CookieGet</servlet-name>
</servlet>
<servlet>
<servlet-class>CookieSetServlet</servlet-class>
<servlet-name>CookieSet</servlet-name>
</servlet>
<servlet>
<servlet-class>ShoppingCartCookieServlet</servlet-class>
<servlet-name>ShoppingCartCookie</servlet-name>
</servlet>
<servlet>
<servlet-class>ShoppingCartSessionServlet</servlet-class>
<servlet-name>ShoppingCartSession</servlet-name>
</servlet>
<servlet>
<servlet-class>CartSaveServlet</servlet-class>
<servlet-name>CartSave</servlet-name>
</servlet>
<servlet>
<servlet-class>CartSaveSessionServlet</servlet-class>
<servlet-name>CartSaveSession</servlet-name>
</servlet>
<servlet>
<servlet-class>CartDeleteServlet</servlet-class>
<servlet-name>CartDelete</servlet-name>
</servlet>
<servlet>
<servlet-class>CartDeleteSessionServlet</servlet-class>
<servlet-name>CartDeleteSession</servlet-name>
</servlet>
<servlet>
<servlet-class>SessionTestServlet</servlet-class>
<servlet-name>SessionTest</servlet-name>
</servlet>
<servlet>
<servlet-class>CountServlet</servlet-class>
<servlet-name>Count</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>Count</servlet-name>
<url-pattern>/servlet/Count</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>SessionTest</servlet-name>
<url-pattern>/servlet/SessionTest</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CookieGet</servlet-name>
<url-pattern>/servlet/CookieGet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CookieSet</servlet-name>
<url-pattern>/servlet/CookieSet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ShoppingCartCookie</servlet-name>
<url-pattern>/servlet/ShoppingCartCookie</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ShoppingCartSession</servlet-name>
<url-pattern>/servlet/ShoppingCartSession</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartSave</servlet-name>
<url-pattern>/servlet/CartSave</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartSaveSession</servlet-name>
<url-pattern>/servlet/CartSaveSession</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartDelete</servlet-name>
<url-pattern>/servlet/CartDelete</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartDeleteSession</servlet-name>
<url-pattern>/servlet/CartDeleteSession</url-pattern>
</servlet-mapping>
</web-app>
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==========================================
forward vs redirect
ForwardDemoServlet.java
/*
* Request Dispatcher (요청재전송) --> Forwarding
* 1. 사용자의 요청을 받은 서블릿 혹은 JSP 에서 다른 컴포넌트(다른 서블릿, 다른 JSP, html)로
* 요청을 위임할 수 있는 방법
* 2. 사용이유는 1)보안, 2) 처리작업의 모듈화
* 3. 직접 요청을 받은 서블릿 혹은 JSP는 모든 작업을 직접 처리하지 않고 모듈화시킨 다른
* 컴포넌트로 요청을 위임하여 처리할 수 있는 방법
* 4. 재사용성이 높아지고, 유지보수가 쉬워짐
* 5. 일반적으로 MVC패턴에서 서블릿이 JSP 페이지로 포워딩할 때 주로 사용함.
* 6. 사용자로부터 요청을 받은 페이지와 사용자에게 응답을 처리하는 페이지를 구별할 수 있다.
* 7. 일반적으로 이러한 패턴을 FrontController 패턴이라고 한다.
* 8. 요청을 받는 페이지는 서블릿으로 구현하고, 응답을 처리하는 페이지는 JSP 로 구현할 수 있다.
* 9. Model2(MVC) 의 핵심기능이다.
* 10. 요청한 자원의 포워딩 방법 2가지
* 1) RequestDispatcher의 forward() 메소드
* 2) ServletResponse 의 sendRedirect() 메소드
*/
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ForwardDemoServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
ServletContext context = this.getServletContext();
RequestDispatcher rd =
context.getRequestDispatcher("/product.html");
rd.forward(req, res);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
this.doGet(req, res);
}
}
VisitServlet.java
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.io.IOException;
import java.util.Date;
import java.text.SimpleDateFormat;
public class VisitServlet extends HttpServlet{
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html;charset=utf-8");
PrintWriter out = res.getWriter();
out.println("<!DOCTYPE html><html lang=\"ko\">");
out.println("<head><title>Welcome Hello Servlet!</title>");
out.println("<meta charset='utf-8'>");
out.println("<style>");
out.println("body { background-color:yellow;font-size:1.5em;}");
out.println("div { color:blue;font-weight:900; }");
out.println("span {color:red;}");
out.println("</style></head><body>");
out.println("<div>");
String pattern = "귀하가 방문한 날짜와 시간은 Y년 M월 d일 H시 m분 s초 입니다.";
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
String str = sdf.format(new Date());
out.println("<span>" + str + "</span></div>");
out.println("</body></html>");
out.close();
}
}
-----------------------
ForwardTestServlet.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ForwardTestServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
res.setContentType("text/html;charset=utf-8");
PrintWriter out = res.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body bgcolor='red'>");
out.println("<h1>이 페이지는 절대로 보여지지 않아야 합니다.</h1>");
out.println("</body></html>");
ServletContext context = this.getServletContext();
RequestDispatcher rd =
context.getRequestDispatcher("/servlet/ForwardTest1");
rd.forward(req, res);
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
this.doGet(req, res);
}
}
ForwardTestServlet1.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ForwardTestServlet1 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
res.setContentType("text/html;charset=utf-8");
PrintWriter out = res.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body bgcolor='yellow'>");
out.println("<h1>나는 ForwardTestServlet1페이지입니다.</h1>");
out.println("<a href='/0613/servlet/ForwardTest'>원래 페이지</a>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
this.doGet(req, res);
}
}
-------------------------------
RedirectDemoServlet.java
/*
* Redirect
* 1. Forward와 마찬가지로 다른 웹 컴포넌트에게 페이지를 위임하는 방법
* 2. 차이점은 응답을 먼저하고 클라이언트의 브라우저가 다시 재요청하기 때문에,
* 브라우저의 URL 과 새로 응답하는 페이지가 같다.
* 3. response.sendRedirect(target)
* 4. target은 동일 컨텍스트의 서브릿, 혹은 JSP, 혹은 Html, 다른 컨텍스트, 다른 도메인,
* 다른 웹 서버도 가능
*
*/
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;
public class RedirectDemoServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
res.setContentType("text/html;charset=utf-8");
PrintWriter out = res.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body bgcolor='red'>");
//res.sendRedirect("http://www.javaexpert.co.kr"); 1. 첫번째 방법
out.println("<script>"); //2. 두번째 방법
out.println("location.href = 'http://www.naver.com';");
out.println("</script>");
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
this.doGet(req, res);
}
}
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0"
metadata-complete="true">
<display-name>Welcome to 0613 Web Project </display-name>
<servlet>
<servlet-class>CookieGetServlet</servlet-class>
<servlet-name>CookieGet</servlet-name>
</servlet>
<servlet>
<servlet-class>ForwardDemoServlet</servlet-class>
<servlet-name>ForwardDemo</servlet-name>
</servlet>
<servlet>
<servlet-class>CookieSetServlet</servlet-class>
<servlet-name>CookieSet</servlet-name>
</servlet>
<servlet>
<servlet-class>ShoppingCartCookieServlet</servlet-class>
<servlet-name>ShoppingCartCookie</servlet-name>
</servlet>
<servlet>
<servlet-class>ShoppingCartSessionServlet</servlet-class>
<servlet-name>ShoppingCartSession</servlet-name>
</servlet>
<servlet>
<servlet-class>CartSaveServlet</servlet-class>
<servlet-name>CartSave</servlet-name>
</servlet>
<servlet>
<servlet-class>CartSaveSessionServlet</servlet-class>
<servlet-name>CartSaveSession</servlet-name>
</servlet>
<servlet>
<servlet-class>CartDeleteServlet</servlet-class>
<servlet-name>CartDelete</servlet-name>
</servlet>
<servlet>
<servlet-class>CartDeleteSessionServlet</servlet-class>
<servlet-name>CartDeleteSession</servlet-name>
</servlet>
<servlet>
<servlet-class>SessionTestServlet</servlet-class>
<servlet-name>SessionTest</servlet-name>
</servlet>
<servlet>
<servlet-class>CountServlet</servlet-class>
<servlet-name>Count</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>ForwardDemo</servlet-name>
<url-pattern>/servlet/ForwardDemo</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Count</servlet-name>
<url-pattern>/servlet/Count</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>SessionTest</servlet-name>
<url-pattern>/servlet/SessionTest</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CookieGet</servlet-name>
<url-pattern>/servlet/CookieGet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CookieSet</servlet-name>
<url-pattern>/servlet/CookieSet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ShoppingCartCookie</servlet-name>
<url-pattern>/servlet/ShoppingCartCookie</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ShoppingCartSession</servlet-name>
<url-pattern>/servlet/ShoppingCartSession</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartSave</servlet-name>
<url-pattern>/servlet/CartSave</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartSaveSession</servlet-name>
<url-pattern>/servlet/CartSaveSession</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartDelete</servlet-name>
<url-pattern>/servlet/CartDelete</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CartDeleteSession</servlet-name>
<url-pattern>/servlet/CartDeleteSession</url-pattern>
</servlet-mapping>
</web-app>
ㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡ
include
myimage.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<h1 style='text-align:center'>여신</h1>
<div style='text-align:center'><img src="/0613/images/jimin.jpg"></div>
</body>
</html>
IncludeDemoServlet.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class IncludeDemoServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
res.setContentType("text/html;charset=utf-8");
PrintWriter out = res.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html lang='ko'>");
out.println("<body bgcolor='red'>");
ServletContext context = this.getServletContext();
RequestDispatcher rd =
context.getRequestDispatcher("/myimage.html");
rd.include(req, res);
out.println("<hr>");
rd = context.getRequestDispatcher("/servlet/Visit");
rd.include(req, res);
out.println("</body></html>");
out.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{
this.doGet(req, res);
}
}
web.xml
<servlet>
<servlet-class>IncludeDemoServlet</servlet-class>
<servlet-name>IncludeDemo</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>IncludeDemo</servlet-name>
<url-pattern>/servlet/IncludeDemo</url-pattern>
</servlet-mapping>
//이렇게 두개의 페이지를 붙이면 close가 두번 일어나므로, 포함되는 페이지는 close 하면 안된다. 그래서 위의 VisitServlet.java 에서 out.close(); 를 삭제한다.
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