[JSP] ch04-02. 장바구니

4-2. 장바구니

main.html

<!DOCTYPE html>
<html lang="ko">
<head>
<title></title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
</head>
<body>
    <h2>메인</h2>
    <a href="listProd.jsp"><button type="button">상품목록</button></a>
    <a href="cartProc.jsp"><button type="button">장바구니</button></a>
</body>
</html>​

 

listProd.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<h2>상품 목록</h2>
<form action="cartProc.jsp" method="post">
    <ul>
        <li>노트북<input type="checkbox" name="wishProd" value="노트북"></li>
        <li>전기차<input type="checkbox" name="wishProd" value="전기차"></li>
        <li>아파트<input type="checkbox" name="wishProd" value="아파트"></li>
        <li>북한산<input type="checkbox" name="wishProd" value="북한산"></li>
    </ul>
    <a href="main.html"><button type="button">메인으로</button></a>
    <button type="submit">장바구니에 담기</button>
</form>

 

 

cartProc.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="java.net.URLEncoder, java.net.URLDecoder"%>
<%@ page import="java.util.StringTokenizer"%>
<%@ page import="java.util.HashSet, java.util.Set"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
    request.setCharacterEncoding("utf-8");

    //찜한 상품들
    String[] wishProds = request.getParameterValues("wishProd");
    //장바구니에서 삭제한 상품들
    String[] delProds = request.getParameterValues("delProd");
    //장바구니
    Set<String> cart = new HashSet<>();
    
    //장바구니에 상품들을 담는다.
    Cookie[] cookies = request.getCookies();
    for(Cookie cookie:cookies){
        if(cookie.getName().equals("cart")){
            String tmp = URLDecoder.decode(cookie.getValue(), "utf-8");
            StringTokenizer st = new StringTokenizer(tmp, ",");
            while(st.hasMoreTokens()) cart.add(st.nextToken());
        }
    }
    
    //상품을 찜하면
    if(wishProds != null)
        for(String prod:wishProds) cart.add(prod);
    //장바구니에서 상품을 삭제하면
    if(delProds != null)
        for(String prod:delProds) cart.remove(prod);
    
    //장바구니를 client에 전달한다.
    String cartStr="";
    for(String prod:cart) cartStr += prod+",";
    cartStr = URLEncoder.encode(cartStr,"utf-8");
    Cookie cookie = new Cookie("cart", cartStr);
    cookie.setMaxAge(60*60*24*365);
    response.addCookie(cookie);
    
    request.setAttribute("cart", cart);
%>
<jsp:forward page="cartOut.jsp"/>

 

cartOut.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="java.util.HashSet, java.util.Set"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<h2>장바구니</h2>
<form action="cartProc.jsp" method="post">
    <ul>

<%
    Set<String> cart = (Set<String>)request.getAttribute("cart");
    if(cart.size()==0){
%>
    <p>장바구니가 비었습니다</p>
<%
    }else{
        for(String prod:cart){
%>            
    <li><%=prod%>
        <input type="checkbox" name="delProd" value="<%=prod %>">
    </li>
<%
        }
    }
%>
    </ul>
    <a href="listProd.jsp"><button type="button">상폼목록</button></a>
    <button type="submit">삭제</button>
</form>