SpringMVC域对象共享数据

使用ServletAPI向request域对象共享数据

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

使用ModelAndView向request域对象共享数据

@RequestMapping("/testModelAndView")
public ModelAndView testModelAndView(){
	/**
	* 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 = new ModelAndView();
	//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;
}

使用Model向request域对象共享数据

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

使用map向request域对象共享数据

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

使用ModelMap向request域对象共享数据

@RequestMapping("/testModelMap")
	public String testModelMap(ModelMap modelMap){
	modelMap.addAttribute("testScope", "hello,ModelMap");
	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 {}

向session域共享数据

@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";
}