Carring data across redirect requests

Redirecting with URL templates

@RequestMapping(value = "save") 
public String saveDutyRelation(HttpServletRequest request, DutyRelation dutyRelation, Model model) throws Exception {
     try {
             requireNonNull(dutyRelation.getId(), "ID不能为空");
             requireNonNull(dutyRelation.getDutyCode(), "职务编码不能为空");
             dutyRelationService.updateById(dutyRelation, dutyRelation.getId());

             result.setMessageSuccess("保存成功");
     } catch (BusinessException e) {
         result.setCode(e.getCode());
         result.setMessage(e.getMessage());
     }
     model.addAttribute("username", dutyRelation.getId());
     model.addAttribute("id", dutyRelation.getId());
     model.addAttribute("code", dutyRelation.getDutyCode());

     return "redirect:/dutyRelation/{username}";
}

重定向的地址是：http://**/dutyRealtion/username?id=某个值&code=某个值

Working with flash attrbutes

@RequestMapping(value = "save") 
public String saveDutyRelation(HttpServletRequest request, DutyRelation dutyRelation, RedirectAttributes attributes) throws Exception {
     result = new Result();
     try {
             requireNonNull(dutyRelation.getId(), "ID不能为空");
             requireNonNull(dutyRelation.getDutyCode(), "职务编码不能为空");
             dutyRelationService.updateById(dutyRelation, dutyRelation.getId());

             result.setMessageSuccess("保存成功");
     } catch (BusinessException e) {
         result.setCode(e.getCode());
         result.setMessage(e.getMessage());
     }

     attributes.addAttribute("username",  dutyRelation.getId());
     attributes.addFlashAttribute(dutyRelation); // 可以根据类型推断 key 是 “dutyRelation”

     return "redirect:/dutyRelation/{username}";
}

原理：Flash attrbutes are stored in the session and then retrieved into the modal, surviving a redirect