accountresultaction.java

我在加拿大学习的一个比较复杂的在线银行程序.

package com.ebusiness.ebank.action;

import java.util.Locale;
import java.util.List;
import java.util.Iterator;

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.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMessages;
import org.apache.log4j.Logger;
import org.apache.log4j.MDC;
import org.apache.struts.Globals;

import com.ebusiness.ebank.form.AccountForm;
import com.ebusiness.ebank.servicedelegate.AccountAccessDelegate;
import com.ebusiness.ebank.bean.AccountValue;
import com.ebusiness.ebank.bean.ValueList;
import com.ebusiness.ebank.criteria.StatementSearchCriteria;
import com.ebusiness.ebank.exception.BusinessException;
import com.ebusiness.ebank.exception.SystemException;
import com.ebusiness.ebank.util.Constants;


/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: eBusiness Inc., All right reserved</p>
 * @author unascribed
 * @version 1.0
 */

public class AccountResultAction extends Action
{
    public ActionForward execute(ActionMapping mapping,
                                 ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response) throws Exception
    {
        Logger log = Logger.getLogger(this.getClass());
        MDC.put("userid", request.getRemoteUser());

        HttpSession session = request.getSession(false);
        Locale locale = (Locale)session.getAttribute(Globals.LOCALE_KEY);
        AccountForm accountForm = (AccountForm)form;
        String action = accountForm.getAction();

        ActionErrors errors =  new ActionErrors();
        // default forward
        String forward="failure";

        if ("back".equalsIgnoreCase(action))
            forward = "back";
        else if (("editAccount").equalsIgnoreCase(action))
        {
            try
            {
                AccountForm aForm = getAccountForm(session, accountForm, locale);
                session.setAttribute(Constants.ACCOUNT_FORM, aForm);
                forward = "edit";
            }
            catch (Exception e)
            {
               log.error(e.getMessage(),e) ;
               forward = "error" ;
            }
        }
        else if (action.endsWith("Statement"))
        {
           try
           {
               StatementSearchCriteria criteria = new StatementSearchCriteria();
               AccountForm aForm = getAccountForm(session, accountForm, locale);
               criteria.setAccountNo(aForm.getAccountNo());
               criteria.setAccountType(aForm.getAccountType());
               ValueList vList = AccountAccessDelegate.search(criteria);
               request.setAttribute(Constants.VALUE_LIST, vList.getSearchResults());
               request.setAttribute(Constants.ACCOUNT_FORM, aForm);
               if (Constants.VISA_ACCOUNT.equals(aForm.getAccountType()))
                  forward = "viewVisaStatement";
               else
                  forward = "viewStatement";
           }
           catch (SystemException e)
           {
              log.error(e.getMessage(),e) ;
              forward = "error" ;
           }
           catch (BusinessException e)
           {
               errors.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage("errors.businessException",e.getMessage(locale)));
               saveErrors(request,errors);
               forward = "failure" ;
           }
        }

        if (!errors.isEmpty()) {
                saveErrors(request, errors);
                forward = "failure" ;
        }

        return mapping.findForward(forward);
  }

    //Help method to get Account from the account list stored in session object
    private AccountForm getAccountForm(HttpSession session, AccountForm accountForm, Locale locale) throws Exception
    {
         List aList = (List)session.getAttribute(Constants.ACCOUNT_LIST);
         AccountValue aValue = null;
         for (Iterator i = aList.iterator(); i.hasNext();)
         {
             aValue = (AccountValue)i.next();
             if (aValue.getObjectID() == accountForm.getObjectID())
               break;
         }
         //AccountValue aValue = AccountAccessDelegate.viewAccountByOID(accountForm.getObjectID(), accountForm.getAccountType());
         AccountForm aForm = (AccountForm)Class.forName("com.ebusiness.ebank.form." + aValue.getValueType() + "Form").newInstance();
         aForm.mappingFromModel(aValue, locale);
         return aForm;
    }
}