SpringMVC 域对象共享数据

文章目录

1、使用ServletAPI向request域对象共享数据

@RequestMapping("/testServletAPI")publicStringtestServletAPI(HttpServletRequest request){
    request.setAttribute("testScope","hello,servletAPI");return"success";}

2、使用ModelAndView向request域对象共享数据

@RequestMapping("/testModelAndView")publicModelAndViewtestModelAndView(){/**
     * ModelAndView有Model和View的功能
     * Model主要用于向请求域共享数据
     * View主要用于设置视图，实现页面跳转
     */ModelAndView mav =newModelAndView();//向请求域共享数据
    mav.addObject("testScope","hello,ModelAndView");//设置视图，实现页面跳转
    mav.setViewName("success");return mav;}

3、使用Model向request域对象共享数据

@RequestMapping("/testModel")publicStringtestModel(Model model){
    model.addAttribute("testScope","hello,Model");return"success";}

4、使用map向request域对象共享数据

@RequestMapping("/testMap")publicStringtestMap(Map<String,Object> map){
    map.put("testScope","hello,Map");return"success";}

5、使用ModelMap向request域对象共享数据

@RequestMapping("/testModelMap")publicStringtestModelMap(ModelMap modelMap){
    modelMap.addAttribute("testScope","hello,ModelMap");return"success";}

6、Model、ModelMap、Map的关系

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

public interface Model{}
public class ModelMap extends LinkedHashMap<String, Object> {}
public class ExtendedModelMap extends ModelMap implements Model {}
public class BindingAwareModelMap extends ExtendedModelMap {}

7、向session域共享数据

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

8、向application域共享数据

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