在Spring MVC中重定向期间传递模型属性，并在URL中避免相同 [英] Passing model attribute during redirect in spring MVC and avoiding the same in URL

问题描述

我是Spring的新手
我也在stackoverflow中搜索了网页和相关帖子。我没有找到我真正需要的那个。

我的目标是在重定向期间将模型属性从控制器传递到jsp页面，并避免在URL中显示属性。
以下是验证使用jdo从数据存储区登录。

I am a newbie to Spring
I have searched web and related posts in stackoverflow too. I didn't find the one that i actually need.
My objective is to pass model attributes from controller to jsp page during a redirect and avoid the attribute being displayed in URL.
The below is validating login from datastore using jdo.

我的控制器：

 @Controller
 public class LoginController {
int count;
PersistenceManager pm = PMF.get().getPersistenceManager();

//Instance of data class
    User user;
ModelAndView modelAndView=new ModelAndView();

@RequestMapping(value="/Login",method = RequestMethod.POST)
public ModelAndView loginValidate(HttpServletRequest req){

         //Getting login values
    String uname=req.getParameter("nameLogin");
    String pswd1=req.getParameter("pswdLogin");
    count=0;


    user=new User();

            //Generating Query
    Query q = pm.newQuery(User.class);
    q.setFilter("userName == userNameParam");
    q.declareParameters("String userNameParam");

    try{
        List<User> results = (List<User>) q.execute(uname);  
        for (User u: results) {

            String userName=u.getUserName();

                if(userName.equals(uname)){

                    System.out.println(u.getPassword());

                    if(u.getPassword().equals(pswd1)){
                        count=count+1;
                            modelAndView.setViewName("redirect:welcome");
                        modelAndView.addObject("USERNAME",uname);
                        return modelAndView;

                    }
     //rest of the logic 
  }

JSP：

  <h1>Welcome ${USERNAME} </h1>

我的网址是/ welcome？USERNAME = robin

我的目标是显示它作为/ welcome

此外，我的页面应该显示Welcome robin，而它只显示Welcome。请让我知道如何解决它。

提前致谢！

My URL is /welcome?USERNAME=robin
My objective is to show it as /welcome
Also, my page is supposed to display "Welcome robin" whereas it displays only Welcome. Please let me know how can i resolve it.
Thanks in advance!

推荐答案

您应该使用 flash属性工具Spring MVC。如果希望在重定向后可以访问数据，则不要将其添加到模型中（模型， ModelMap 或 ModelAndView ）但是你在控制器方法中作为参数得到的 RedirectAttributes 。

You should use the flash attribute facility of Spring MVC. When you want data to be accessible after a redirect, you do not add it to the model (Model, ModelMap or ModelAndView) but to a RedirectAttributes that you get as parameter in your controller method.

@RequestMapping(value="/Login",method = RequestMethod.POST)
public ModelAndView loginValidate(HttpServletRequest req, RedirectAttributes redir){
...

    modelAndView.setViewName("redirect:welcome");
    redir.addFlashAttribute("USERNAME",uname);
    return modelAndView;
}

这些 flash属性通过会话传递（并在使用后立即销毁 - 有关详细信息，请参阅Spring参考手册。这有两个兴趣：

Those flash attributes are passed via the session (and are destroyed immediately after being used - see Spring Reference Manual for details). This has two interests :

• 它们在URL中不可见


• 您不限于String ，但可以传递任意对象。

这篇关于在Spring MVC中重定向期间传递模型属性，并在URL中避免相同的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！