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나는 shopping 웹 응용 프로그램을 만드는 중이라서가 HTTP를 :, 내가 여기에 첫 번째 HTML 양식 세션 계산
<!DOCTYPE html>
<html>
<head>
<META HTTP-EQUIV="Pragma" CONTENT="no cache">
<META HTTP-EQUIV="Cache-control"
CONTENT="no cache">
<META HTTP-EQUIV="Expires" CONTENT="0">
<TITLE>Shopping Cart</TITLE>
<title> Shopping Cart </title>
</head>
<body>
<center>
<h3> Simple Shopping Cart </h3>
<form method=post action="Selection">
<table>
<tr>
<td>
<input type="radio" name="Product" value="Apples" checked>
<font color=blue> Apples </font>
</td>
</tr>
<tr>
<td>
<input type="radio" name="Product" value="Pears">
<font color=blue> Pears </font>
</td>
</tr>
<tr>
<td>
<input type="radio" name="Product" value="Checkout">
<font color=blue> Go To the checkout </p> </font>
</td>
</tr>
</table>
<BR><BR><BR>
<input type="submit" value="Submit">
</form>
</center>
</body>
</html>
을 그리고 이것은 내 Selection Servlet`입니다 :
@WebServlet("/Selection")
public class Selection extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
String currentProduct = request.getParameter("Product");
HttpSession cart = request.getSession();
cart.setAttribute("currentProd", currentProduct);
if (currentProduct.equals("Checkout")) {
response.sendRedirect("Checkout"); // Send to Checkout Servlet
} else {
sendPage(response, currentProduct); //Creates page for selection of weight.
}
}
private void sendPage(HttpServletResponse reply, String product) throws IOException {
reply.setContentType("text/html");
PrintWriter out = reply.getWriter();
out.println("<HTML>");
out.println("<HEAD>");
out.println("<TITLE>" + product + "</TITLE>");
out.println("</HEAD>");
out.println("<BODY>");
out.println("<CENTER>");
out.println("<h1><font color=blue>" + product + " </font> </h1> ");
out.println("<BR><BR><BR>");
out.println(" <form method=post action='Weight' ");
out.println("<TABLE>");
out.println("<TR>");
out.println(" <TD>Quantity required (kg)");
out.println(" <INPUT TYPE='Text' NAME='Qty' VALUE='' SIZE=5></TD>");
out.println("</TR>");
out.println("</TABLE>");
out.println("<BR><BR><BR>");
out.println("<TABLE>");
out.println("<TR>");
out.println(" <TD> <INPUT TYPE = 'radio' NAME='Option' VALUE='Add' Checked> ");
out.println(" <FONT COLOR=blue> "
+ "Add to cart.</FONT></TD>");
out.println("</TR>");
out.println("<TR>");
out.println(" <TD><INPUT TYPE='Radio'"
+ " NAME='Option' VALUE='Remove'>");
out.println(" <FONT COLOR=blue> " +
"Remove item from cart.</FONT></TD>");
out.println("</TR>");
out.println("<TR>");
out.println(" <TD><INPUT TYPE='Radio'"
+ " NAME='Option' VALUE='Next'>");
out.println(" <FONT COLOR=blue> "
+ "Choose next item.</FONT></TD>");
out.println("</TR>");
out.println("<TR>");
out.println(" <TD><INPUT TYPE='Radio'"
+ " NAME='Option' VALUE='Checkout'>");
out.println(" <FONT COLOR=blue> "
+ "Go to checkout.</FONT></TD>");
out.println("</TR>");
out.println("</TABLE>");
out.println("<BR><BR><BR>");
out.println("<INPUT TYPE='Submit' VALUE='Submit'>");
out.println("</FORM>");
out.println("</CENTER>");
out.println("</BODY>");
out.println("</HTML>");
out.flush();
}
}
그리고 마지막으로,이
@WebServlet("/Checkout")
public class Checkout extends HttpServlet {
private final float APPLES_PRICE = 1.45F;
private final float PEARS_PRICE = 1.75F;
//In a real application, the above prices would be
//retrieved from a database, of course.
public void service(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
HttpSession cart = request.getSession();
response.setContentType("text/HTML");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("<HEAD>");
out.println("<TITLE>Checkout</TITLE>");
out.println("</STYLE>");
out.println("</HEAD>");
out.println("<BODY>");
out.println("<BR><BR><BR>");
out.println("<CENTER>");
out.println(
"<H1><FONT COLOR=Blue>Order List</FONT></H1>");
out.println("<BR><BR><BR>");
out.println("<TABLE BGCOLOR=Aqua BORDER=2>");
out.println("<TR>");
out.println("<TH>Item</TH>");
out.println("<TH>Weight(kg)</TH>");
out.println("<TH>Cost(£)</TH>");
out.println("</TR>");
cart.removeAttribute("currentProd");
Enumeration prodNames = cart.getAttributeNames();
float totalCost = 0;
int numProducts = 0;
while (prodNames.hasMoreElements()) {
float wt = 0, cost = 0;
String product = (String) prodNames.nextElement();
String stringWT = (String) cart.getAttribute(product);
wt = Float.parseFloat(stringWT);
if (prodNames.equals("Apples")) {
cost = APPLES_PRICE * wt;
} else if (prodNames.equals("Pears")) {
cost = PEARS_PRICE * wt;
}
out.println("<TR>");
out.println("<TD>" + product + "</TD>");
out.format("<TD> %4.2f </TD>%n", wt);
out.format("<TD> %5.2f </TD>%n", cost);
out.println("</TR>");
totalCost += cost;
numProducts++;
}
if (numProducts == 0) {
out.println("<TD>*** No orders placed! ***</TD></TR>");
} else {
out.println("<TD></TD>"); //Blank cell.
out.println("<TD>Total cost:</TD>");
out.format("<TD> %5.2f </TD>%n", totalCost);
out.println("</TR>");
}
out.println("</TABLE>");
out.println("</CENTER>");
out.println("</BODY>");
out.println("</HTML>");
out.flush();
}
}
내 문제가 calculatin에 있습니다 Checkout 서블릿이다 g가 cost이고 총 비용이 가변적입니다.
결과적으로 모든 쇼핑 결제는 Zero!
내 코드에 어떤 문제가 있습니까?