응답 래퍼 클래스

CookieLowerCaseResponseWrapper.java 

(쿠키 데이터에 포함된 모든 대문자를 소문자로 바꾸는 응답래퍼 클래스)

package filter;

import javax.servlet.ServletResponse;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpServletResponseWrapper;

public class CookieLowerCaseResponseWrapper extends HttpServletResponseWrapper {

     private HttpServletResponse response;

     public CookieLowerCaseResponseWrapper(HttpServletResponse response) {

         super (response);

         // TODO Auto-generated constructor stub

         this .response = response;

        

    }

    

     public void addCookie(Cookie cookie){

        String value = cookie.getValue();

        String newValue = value.toLowerCase();

        cookie.setValue(newValue);

         response.addCookie(cookie);

    }

}

---

CookieLowerCaseFilter.java

(응답 래퍼 클래스를 사용하는 필터 클래스)

package filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.annotation.WebFilter;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet Filter implementation class CookieLowerCaseFilter

 */

@WebFilter ("*.jsp" )

public class CookieLowerCaseFilter implements Filter {

     public void init(FilterConfig config) throws ServletException{

        

    }

    /**

     * Default constructor.

     */

    public CookieLowerCaseFilter() {

        // TODO Auto-generated constructor stub

    }

     /**

     * @see Filter#destroy()

     */

     public void destroy() {

         // TODO Auto-generated method stub

    }

     /**

    

     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)

     */

     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

         // TODO Auto-generated method stub

         // place your code here

        CookieLowerCaseResponseWrapper responseWrapper =

                 new CookieLowerCaseResponseWrapper((HttpServletResponse) response);

         // pass the request along the filter chain

        chain.doFilter(request, responseWrapper);

    }

}

---

CookieSaver.jsp

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

    pageEncoding= "UTF-8" %>

<%

    Cookie cookie = new Cookie("CART" , "Lemon, Apple, Chocolate");

    response.addCookie(cookie);

%>

<! DOCTYPE html>

< html>

< head>

< meta charset= "UTF-8" >

< title> Insert title here </title >

</ head>

< body>

    쿠키가 저장되었습니다.

</ body>

</ html>

---

CookieRetriever.jsp

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

    pageEncoding= "UTF-8" %>

<! DOCTYPE html>

< html>

< head>

< meta charset= "UTF-8" >

< title> Insert title here </title >

</ head>

< body>

    CART = ${cookie.CART.value}

</ body>

</ html>