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http://devyongsik.tistory.com/290
(예제)
//SessionTest3.java
@WebServlet("/sessionTest3")
public class SessionTest3 extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
HttpSession session = request.getSession();
String name = request.getParameter("fruit");
int number = Integer.parseInt(request.getParameter("number"));
ArrayList<Fruit> cart = null;
if((cart = (ArrayList<Fruit>)session.getAttribute("cart"))==null){
cart = new ArrayList<Fruit>();
cart.add(new Fruit(name,number));
}else{
if(cart.contains(new Fruit(name,number))){
System.out.println("d");
cart.get(cart.indexOf(new Fruit(name,number))).add(number);
}else{
System.out.println("d");
cart.add(new Fruit(name,number));
}
}
session.setAttribute("cart", cart);
response.sendRedirect("fruit2.html");}
}
//ShowCart2.java
@WebServlet("/showCart2")
public class ShowCart2 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
HttpSession session = request.getSession();
ArrayList<Fruit> list = (ArrayList<Fruit>) session.getAttribute("cart");
if (list != null) {
for (Fruit f : list) {
out.print(f.getName()+"("+f.getPrice()+"원):"+f.getNumber()+"개:총"+f.getPrice()*f.getNumber()+"<br>");
}
}
out.close();
}
}
//fruit2.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="/edu/sessionTest3">
<input type="radio" name="fruit" value="apple" checked>사과(500원)<br>
<input type="radio" name="fruit" value="peach">복숭아(600원)<br>
<input type="radio" name="fruit" value="grape">포도(1000원)<br>
<input type="radio" name="fruit" value="watermelon">수박(3000원)<br>
<input type="radio" name="fruit" value="plum">자두(200원)<br>
수량<input type="number" name="number" min="1" max="50" required><br>
<input type="submit" value="장바구니 담기">
</form>
<form action="/edu/showCart2">
<input type="submit" value="장바구니 확인">
</form>
</body>
</html>
//Fruit.java
public class Fruit {
private String name;
private int price;
private int number;
public Fruit(String name, int number) {
this.name = name;
if (name.equals("apple"))
this.price = 500;
else if (name.equals("peach"))
this.price = 600;
else if (name.equals("grape"))
this.price = 1000;
else if (name.equals("watermelon"))
this.price = 3000;
else
this.price = 200;
this.number = number;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public void add(int number) {
this.number += number;
}
@Override
public boolean equals(Object obj) {
Fruit f = (Fruit)obj;
if(f.getName().equals(this.name)) return true;
else return false;
}
}
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