baseaction.java

基于struts框架编写的在线考试系统

package examonline.struts.actions.admin;

import org.apache.struts.action.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import examonline.utils.Constants;


public abstract class BaseAction extends Action
{
  public BaseAction()
  {
  }

  /**
   * execute
   *
   * @param mapping ActionMapping
   * @param form ActionForm
   * @param request HttpServletRequest
   * @param response HttpServletResponse
   * @return ActionForward
   * @throws Exception
   * @todo Implement this org.apache.struts.action.Action method
   */
  public ActionForward execute(ActionMapping mapping, ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response) throws Exception
  {
    if(!isLoginUser(request))
    {
      ActionErrors errors =new ActionErrors();
       return mapping.findForward(Constants.FORWORD_ADMIN_LOGIN_INFO);
    }
    return executeTask(mapping,form,request,response);
  }
  /**
   * 子类实现自己的业务细节
   * @param mapping ActionMapping
   * @param form ActionForm
   * @param request HttpServletRequest
   * @param response HttpServletResponse
   * @return ActionForward
   * @throws Exception
   */
  public abstract ActionForward executeTask(ActionMapping mapping, ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response) throws Exception;


  private boolean isLoginUser( HttpServletRequest request)
  {
    HttpSession session =request.getSession();
    String adminkey=(String) session.getAttribute(Constants.LOGIN_ADMIN_KEY);
    if(adminkey==null)
      return false;
    return true;
  }

}