在 Spring MVC 中重定向期间传递模型属性并在 URL 中避免相同

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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