struts应用技术

Question

1.在iput页面中加入<html:errors/>
2.在struts-config.xml中里面的<ation中的input="登陆的页面.jsp" validate＝“true”/>
3.在actionform中
    ActionErrors errors = new ActionErrors();
    ActionError error = null;
     if (userid=null) {
      error = new ActionError("error.login.useridnull");
      errors.add("error.news.title", error);
    }
return errors;

Answer 1

这个我知道package web.admin.control.action;import org.apache.struts.action.*;
import javax.servlet.http.*;
import web.baseware.sql.*;
import web.admin.delegate.*;
import web.admin.control.form.*;
import org.apache.struts.actions.DispatchAction;public class AdminLogonAction
    extends DispatchAction {
  public ActionForward execute(ActionMapping actionMapping,
                               ActionForm actionForm,
                               HttpServletRequest httpServletRequest,
                               HttpServletResponse httpServletResponse) {    String successForward = "success";
    String failureForward = "failure";
    String error = "用户不存在或密码错误!请检验你的用户信息!";
    boolean loginOK = false;    //取到查询form
    UserLoginFormBean userLoginFormBean = (UserLoginFormBean) actionForm;
    WebAdminDelegate webAdminDelegate = WebAdminDelegateFactory.getSystemDelegate();    //取得session
    HttpSession session = httpServletRequest.getSession();    //组织查询条件
    UnitCondition a = new UnitCondition("user_name",
                                        UnitCondition.STRING_TYPE,
                                        userLoginFormBean.getUser_name(),
                                        " = ",
                                        "", null);    UnitCondition b = new UnitCondition("user_paswd",
                                        UnitCondition.STRING_TYPE,
                                        userLoginFormBean.getUser_paswd(),
                                        " = ",
                                        "", null);    ComplexCondition cc1 = new ComplexCondition();
    cc1.addUnitCondtion("AND", a);
    cc1.addUnitCondtion("AND", b);    try {
      loginOK = webAdminDelegate.userLoginCheck(cc1);
    }
    catch (Exception ex) {
      ex.printStackTrace();
      httpServletRequest.setAttribute("error", "查询数据库时出错!");
      return (actionMapping.findForward(failureForward));
    }
    System.out.println("login ok = " + loginOK);    if (loginOK) {
      session.setAttribute("loginStatus", "loginOK");
      return actionMapping.findForward(successForward);
    }
    else {
      httpServletRequest.setAttribute("errorMsg",error);
      return actionMapping.findForward(failureForward);
    }  }
}
不设session怎样把errorMsg信息传回登录页面(failureForward)
不使用httpServletRequest.setAttribute("errorMsg",error);
直接使用struts标签怎么取得errorMsg返回登录页面