关于springmvc重定向如何携带参数的问题

//从虚拟班级中删除学生的方法
@RequestMapping(value="deleteUserFromVirtualGradeClass")
public String deleteUserFromVirtualGradeClass(Integer userid,HttpServletResponse response,Model model){
AgencyUserClass agencyUserClass= new AgencyUserClass();
agencyUserClass.setUserId(userid);
List<AgencyUserClass> exitAgencyUserClass = agencyUserClassService.findAgencyUserClassByEntity(agencyUserClass);

int a =
agencyUserClassService.deleteUserFromVirtualGradeClass(exitAgencyUserClass.get(0).getId());
System.out.println(a);
model.addAttribute("agencyClassid", exitAgencyUserClass.get(0).getAgencyClassId());
return "redirect:/manager/checkVirtualGradeClassStudents";
}

直接的使用model就是可以把参数带过去了