// LojaVirtualServlet.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class LojaVirtualServlet extends HttpServlet {
class ItemObject {
public ItemObject(String nome, double preco) {
this.nome = nome;
this.preco = preco;
}
public String getNome() {
return nome;
}
public double getPreco() {
return preco;
}
private String nome;
private double preco;
}
public void init() {
itemList = new Vector();
for (int i = 1; i <= 10; i++) {
itemList.addElement(new ItemObject("Item " + i, 10 * i));
}
}
public void doGet(
HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
HttpSession sessao = request.getSession(true);
Vector itemCurr = (Vector) sessao.getAttribute("itemCurr");
if (itemCurr == null) {
itemCurr = new Vector();
}
String cmd = request.getParameter("cmd");
if (cmd != null) {
if (cmd.equals("Add")) {
itemCurr.addElement(new ItemObject(
request.getParameter("itemNome"),
Double.parseDouble(request.getParameter("itemPreco"))));
}
if (cmd.equals("Remove")) {
itemCurr.removeElementAt(
Integer.parseInt(request.getParameter("itemAt")));
}
}
sessao.setAttribute("itemCurr", itemCurr);
StringBuffer output = new StringBuffer();
output.append("Loja Virtual Servlet");
output.append("Itens disponiveis
");
int i;
ItemObject itob;
for (i = 0; i < itemList.size(); i++) {
itob = (ItemObject) itemList.elementAt(i);
output.append("| " + itob.getNome() +
" | " + itob.getPreco() + " | |
");
}
output.append("
Itens na cesta
");
for (i = 0; i < itemCurr.size(); i++) {
itob = (ItemObject) itemCurr.elementAt(i);
output.append("| " + itob.getNome() +
" | " + itob.getPreco() + " | |
");
}
output.append("
");
response.setContentType("text/html");
response.getWriter().println(output);
}
public String encodeAddCmd(HttpServletResponse response, ItemObject itob) {
return response.encodeURL("LojaVirtualServlet?cmd=Add&itemNome=" +
itob.getNome() + "&itemPreco=" + itob.getPreco());
}
public String encodeRemoveCmd(HttpServletResponse response, int pos) {
return response.encodeURL("LojaVirtualServlet?cmd=Remove&itemAt=" + pos);
}
private Vector itemList;
}