表单校验和业务逻辑校验

表单校验：请求参数->ActionForm->ActionForm.validate->表单校验错误返回errors->reguser.jsp->显示错误信息。

业务逻辑校验：请求参数->ActionForm->ActionForm.validate->表单校验成功则调用Action.execute方法->逻辑校验错误->产生errors->返回reguser.jsp显示错误信息。


public class RegUser extends Action {
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
UserForm userForm = (UserForm)form;
ActionMessages errors = new ActionMessages();
if(userForm.getUser().getUsername().trim().equals("wxx")) {
errors.add("username", new ActionMessage("error.username.wrong"));
/* request.setAttribute(Globals.ERROR_KEY, errors);
return mapping.findForward("failure"); */
saveErrors(request, errors);
return mapping.getInputForward();
}
return mapping.findForward("success");
}
}



<action input="/WEB-INF/user/regUser.jsp" name="userForm" path="/RegUser" type="cn.user.strutsdemo.actions.RegUser">
<forward name="success" path="/WEB-INF/user/main.jsp"></forward>
</action>



Action提供两个方法来保存消息：saveErrors,saveMessage,前者：jsp画面<html:errors>可以取到错误消息，后者<html:messages>取到的是非错误消息，相当于一个是好人一个是坏人。