java - spring 3.0如何从controller向jsp发送数据

Question

我正在尝试将数据发送到 jsp 但它不起作用

public class LoginPageController extends SimpleFormController
{
   public ModelAndView onSubmit(HttpServletRequest request,
       HttpServletResponse response, Object command, BindException errors)
       throws ServletException
   {
       Loginpage lcmd=(Loginpage)command;
       System.out.println("This is LOGIN PAGE");
       System.out.println(lcmd.getUserName());
       System.out.println(lcmd.getPassWord());
       request.setAttribute("MSG","Thank u"); //This code not doing anything.
       return new ModelAndView(new RedirectView("Login.jlc"));
   }
}

Answer 1

您正在更改 request对象，那确实什么都不做。

您想要的是向模型 添加一个变量。因此，您可以这样做:

代替:

request.setAttribute("MSG","Thank u"); //This code not doing anything.
return new ModelAndView(new RedirectView("Login.jlc"));

试试这个:

Map<String, Object> model = new HashMap<String, Object>();
model.put("MSG", "Thank u");
return new ModelAndView(new RedirectView("Login.jlc"), model); // <-- notice this

这将使您能够访问 "Thank u"通过表达式 ${model.MSG} 的值和其他人，如果您将它们添加到 model map 。