四种方式向request域对象共享数据

1.ModelAndView

2.Model

3.Map

4.ModelMap

@Controller
public class ScopeController {
    //使用servletAPI想request域对象共享数据
    @RequestMapping("/testRequestByServletAPI")
    public String testRequestByServletAPI(HttpServletRequest request){
        request.setAttribute("testRequestScope","hello,servletAPI");
        return "success";
    }
    @RequestMapping("/testModelAndView")
    public ModelAndView testModelAndView(){
        ModelAndView mav=new ModelAndView();
        //处理模型数据，即向request共享数据
        mav.addObject("testRequestScope","hello,ModelAndView");
                //设置视图名称
        mav.setViewName("success");
        return mav;

    }

    @RequestMapping("/testModel")
    public String testModel(Model model){
        model.addAttribute("testRequestScope","hello,Model");
        return "success";
    }
    @RequestMapping("/testMap")
    public String testMap(Map<String,Object> map){
        map.put("testRequestScope","testMap");
        return "success";
    }
    @RequestMapping("/testModelMap")
    public String testModelMap(ModelMap modelMap){
        modelMap.addAttribute("testRequestScope","hello,ModelMap");
        return "success";
    }
}

Model ModelMap和Map之间的关系

Model、ModelMap、Map类型的参数其实本质上都是BindingAwareModelMap类型.

向session域共享数据

建议使用原生servletapi

@RequestMapping("/testSession")
    public String testSession(HttpSession session){
        session.setAttribute("testSessionScope","hello,session");
        return "success";

    }

向Application域共享数据

    @RequestMapping("/testApplication")
    public String testApplication(HttpSession session){
        ServletContext application = session.getServletContext();
        application.setAttribute("testApplicationScope","hello,application");
        return "success";
    }