1.拼接字符串：
return "redirect:/page/second?param1=lay&param2=lay2";


2.采用RedirectAttribute来传参数：

public String first(RedirectAttribute redirectAttribute){
    redirectAttribute.addAttribute("param1", "lay");
    return "redirect:/page/second";
}


3.RedirectAttribute—–addFlashAttribute()的用法：

@Controller
@RequestMapping("/page")
public class redirectDemo{
    @RequestMapping("/first")
    public String first(RedirectAttribute redirectAttribute){
        redirectAttribute.addFlashAttibute("param1", "lay");
        return "redirect:/page/second";
    }
    @RequestMapping("/second")
    public String second(@ModelAttribute("param1") String param1){
        System.out.println(param1);
        return "second";
    }
}

springmvc几种重定向 携带数据的方法