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，并避免该属性显示在 URL 中.下面的源代码使用 java 数据对象验证来自数据存储的登录.

My objective is to pass model attributes from controller to JSP page during a redirect and avoid the attribute being displayed in URL. The source code below is validating login from datastore using java data objects.

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>

我当前的 URL 是 /welcome?USERNAME=robin
我的目标是将其显示为 /welcome
另外，我的页面应该显示Welcome robin"，而它只显示 Welcome.

My current URL is /welcome?USERNAME=robin
My goal is to display it as /welcome
Also, my page is supposed to display "Welcome robin" whereas it displays only Welcome.

推荐答案

RedirectAttributes 只适用于 RedirectView，请同理

RedirectAttributes only work with RedirectView, please follow the same

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

    redirectView= new RedirectView("/foo",true);
    redir.addFlashAttribute("USERNAME",uname);
    return redirectView;
}

那些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).这有两个利益:

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
• 您不仅限于字符串，还可以传递任意对象.

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