java - 重定向到接收 Controller 后传递 modelAndView 对象

Question

我有一个后 Controller ，它接受输入表单字段，经过一些计算并检索数据库值后，它重定向到带有两个参数的获取 Controller 。

@RequestMapping(value = "/user/calculate", method = RequestMethod.POST )
public String compareClients(@Valid UserInfo calculate, BindingResult bindingResult) {

   /*some calculations*/
    long firstClient=calculate.getFirstId();
    long secondClient=calculate.getSecondId();
    ModelAndView modelAndView=new ModelAndView();
    modelAndView.addObject("firstInfo",firstInfo);
    modelAndView.addObject("secondInfo",secondInfo);
    modelAndView.addObject("infoId",id);

return "redirect:/user/calculate?firstId=" + firstClient + "&secondId=" + secondClient;

我想将firstInfo、secondInfo和infoId传递给另一个 Controller ，以便从那里我将其显示在thymeleaf上

@RequestMapping(value = "user/calculate", method = RequestMethod.GET, params = { "firstId", "secondId" })
public ModelAndView comparison(@RequestParam(value = "firstId", required = true) String firstId,@RequestParam(value = "secondId", required = true) String secondId) {
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.addObject("firstClient", firstId);
    modelAndView.addObject("secondClient", secondId);
 return modelAndView;
}

我该如何实现这一目标？请帮忙。我尝试使用转发而不是重定向，但响应时间太长，并且不会转发到获取 Controller 。无法使用 flashAttributes，因为如果刷新页面，我需要 Thymeleaf 上的信息。我无法通过 URL 传递所有 5 个对象。如果将这些内容隐藏起来，那就更好了。

Answer 1

我对 Thymeleaf 不太了解，但您可以使用 RedirectAttributes 将所需的值传递给另一个 Controller 。由于您的评论希望在刷新页面时保留该值。所以我给你一个使用 SessionAttributes

的例子

public class YourInfo{
    private String firstInfo;
    private String secondInfo;

    //setter and getter
}

您的 Controller 类添加 session 属性注释

@Controller
@SessionAttributes("myInfo")

现在移至请求部分。

@RequestMapping(value = "/user/calculate", method = RequestMethod.POST )
public String compareClients(@Valid UserInfo calculate, BindingResult bindingResult, Model model) {

   /*some calculations*/
    long firstClient=calculate.getFirstId();
    long secondClient=calculate.getSecondId();
    ModelAndView modelAndView=new ModelAndView();
    modelAndView.addObject("firstInfo",firstClient);
    modelAndView.addObject("secondInfo",secondClient);
    modelAndView.addObject("infoId",id);
    if(!model.containsAttribute("myInfo")){
        YourInfo yourInfo = new YourInfo();
        yourInfo.setFirstInfo(String.valueOf(firstClient));
        yourInfo.setSecondInfo(String.valueOf(secondClient));
        model.addAttribute("myInfo",yourInfo);
    }

    return "redirect:/user/calculate";
}

和你的获取 Controller (假设你的firstInfo和secondInfo将是字符串)

@RequestMapping(value = "user/calculate", method = RequestMethod.GET)
public ModelAndView comparison(@ModelAttribute("myInfo") YourInfo yourInfo) {
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.addObject("firstClient", yourInfo.getFirstInfo());
    modelAndView.addObject("secondClient", yourInfo.getSecondInfo());
    return modelAndView;
}