【SpringMVC】SpringMVC方式，向作用域对象共享数据（ModelAndView、Model、map、ModelMap）

/**
 * @author .29.
 * @create 2023-03-05 15:30
 */
@Controller
public class ScopeController {
    //使用原生ServletAPI 向请求作用域共享数据
    @RequestMapping(value = "/testRequestByServletAPI")
    public String testRequestByServletAPI(HttpServletRequest request){
        request.setAttribute("testRequestScope","use-ServletAPI-setAttribute(request请求作用域)");
        return "success";
    }
}

/**
 * @author .29.
 * @create 2023-03-05 15:30
 */
@Controller
public class ScopeController {
    //SpringMVC方式：通过ModelAndView，向请求作用域共享数据
    @RequestMapping(value = "/testModelandView")
    public ModelAndView testModelAndView(){
        ModelAndView mdv = new ModelAndView();
        //addObject() : 处理模型数据，即：向request请求作用域 共享数据
        mdv.addObject("testRequestScope","use-ModelAndView-setAttribute(request请求作用域)");
        //setViewName() : 设置视图名称
        mdv.setViewName("success");
        return mdv;     //设置完视图名称后，返回ModelAndView对象即可。
    }
}

/**
 * @author .29.
 * @create 2023-03-05 15:30
 */
@Controller
public class ScopeController {
    //SpringMVC方式：通过Model，向请求作用域共享数据
    @RequestMapping(value = "/testModel")
    public String testModel(Model model){
        model.addAttribute("testRequestScope","use-Model-setAttribute(request请求作用域)");
        System.out.println("model:"+model);
        System.out.println(model.getClass().getName());
        return "success";
    }

/**
 * @author .29.
 * @create 2023-03-05 15:30
 */
@Controller
public class ScopeController {
    ///SpringMVC方式：通过map，向请求作用域共享数据
    @RequestMapping(value = "/testMap")
    public String testMap(Map<String,Object> map){
        map.put("testRequestScope","use-Map-setAttribute(request请求作用域)");
        System.out.println("map:"+map);
        System.out.println(map.getClass().getName());
        return "success";
    }
}

/**
 * @author .29.
 * @create 2023-03-05 15:30
 */
@Controller
public class ScopeController {
    ///SpringMVC方式：通过ModelMap，向请求作用域共享数据
    @RequestMapping(value = "/testModelMap")
    public String testModelMap(ModelMap modelMap){
        modelMap.addAttribute("testRequestScope","use-ModelMap-setAttribute(request请求作用域)");
        System.out.println("modelMap:"+modelMap);
        System.out.println(modelMap.getClass().getName());
        return "success";
    }
}

/**
     * 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 {}
     */

/**
 * @author .29.
 * @create 2023-03-05 15:30
 */
@Controller
public class ScopeController {
    //用原生ServletAPI,向session作用域共享数据
    @RequestMapping(value = "/testSession")
    public String testSession(HttpSession session){
        session.setAttribute("testSessionScope","use-ServletAPI-setAttribute(session作用域)");
        return "success";
    }
    //用原生ServletAPI,向session作用域共享数据
    @RequestMapping(value = "/testApplication")
    public String testApplication(HttpSession session){
        ServletContext application = session.getServletContext();
        application.setAttribute("testApplicationScope","use-ServletAPI-setAttribute(Application作用域)");
        return "success";
    }
}