loginaction.java

基于struts框架编写的在线考试系统

package examonline.struts.actions;

import org.apache.struts.action.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import examonline.struts.forms.UserLoginForm;
import examonline.service.*;
import examonline.beans.*;
import examonline.utils.Constants;


public class LoginAction
    extends Action {
  public ActionForward execute(ActionMapping actionMapping,
                               ActionForm actionForm,
                               HttpServletRequest servletRequest,
                               HttpServletResponse servletResponse) {
    ActionErrors errors =new ActionErrors();
    UserLoginForm userLoginForm = (UserLoginForm) actionForm;
    String id=userLoginForm.getId();
    UserDAO dbm=ManagerFactory.getUserManager();
    User user=dbm.findUserById(id);
    if(user==null)
    {
      System.out.println("user doesn't exist");
      errors.add(ActionErrors.GLOBAL_ERROR,new ActionError("error.user.notexist",id));
      this.saveErrors(servletRequest,errors);
      return actionMapping.getInputForward();
    }
    else
    {
    System.out.println("user  exist");
    servletRequest.getSession().setAttribute(Constants.LOGIN_USER_KEY,user);
    return actionMapping.findForward("success");
    }
  }
}