modifycartaction.java

网上商城

package store;
import java.util.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.DynaActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;

public class ModifyCartAction extends Action {
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
  HttpSession session=request.getSession();
  DynaActionForm tform=(DynaActionForm)form;
try{
  String action=(String)tform.get("action");
  String pid=(String)tform.get("pid");
  int cid=Integer.parseInt(pid);
  String qu=(String)tform.get("quantity");
  int quantity=Integer.parseInt(qu);
  Vector vc=(Vector)session.getAttribute("cart");
  ProInfo PI = (ProInfo)vc.get(cid);
  if(action.equals("1")){
      PI.setStock(quantity);
      vc.setElementAt(PI,cid);
    }
    if(action.equals("2")){
      vc.removeElementAt(cid);
    }
   if(action.equals("3")){
      session.removeAttribute("cart");
    }
   session.setAttribute("cart",vc);
  }
  catch(Exception e){
    ActionErrors errors=new ActionErrors ();
    ActionError err= new ActionError ("error.global");
    errors.add(ActionErrors.GLOBAL_ERROR,err);
    this.saveErrors(request,errors);
    return mapping.findForward("error");
  }
  return mapping.findForward("ListCart");
 }
}