如何重定向到另一个URI并访问来自前一个modelAndView的对象

Question

我有以下代码。我想在nextPage.jsp上访问booleanValueObj。这是如何做到的呢?对象并不总是对每个请求的nextPage()方法可用，所以requestParam似乎不合适。

@RequestMapping(method=RequestMethod.POST)
public ModelAndView sendEmail()
{
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.addObject(booleanValueObj, true);
    modelAndView.setViewName("redirect: /nextPageClass");
    return modelAndView;
}
@RequestMapping("/nextPageClass")
public class NextPageController 
{
    @RequestMapping(method = RequestMethod.GET)
    public ModelAndView nextPage() 
    {
        ModelAndView modelAndView = new ModelAndView("/nextPage");
        return modelAndView;
    }
}

Answer 1

不能将booleanValueObj传递给重定向页面。如果boolean valueobj只是一个布尔值，那么通过请求参数传递给/nextPageClass似乎是合适的。

@RequestMapping(method=RequestMethod.POST)
public ModelAndView sendEmail(HttpServletResponse resp)
{
    resp.sendRedirect("/nextPageClass?booleanValueObj=true");
    return null;
}
@RequestMapping("/nextPageClass")
public class NextPageController 
{
    @RequestMapping(method = RequestMethod.GET)
    public ModelAndView nextPage(HttpServletRequest req) 
    {
        ModelAndView modelAndView = new ModelAndView("/nextPage");
        Boolean booleanValueObj = null;
        String booleanValueParam = req.getParameter("booleanValueObj");
        if (booleanValueParam != null)
             booleanValueObj = Boolean.parse(booleanValueParse);
        modelAndView.addObject("booleanValueObj", booleanValueObj);
        return modelAndView;
    }
}

Answer 2

对于Spring 3。

@RequestMapping(value = "/item/delete.htm", method = RequestMethod.GET)
public ModelAndView deleteItem(@RequestParam("id") String id) {
    if (isOk(id)) {
       itemService.delete(id);
       return new ModelAndView("/item/list");
    } else {
       return new ModelAndView("redirect:/item/error.htm");  // <== here redirect
    }
}