SpringMvc框架之域对象共享数据

本次请求下数据有效。

@RequestMapping("/login")
	public String getLoginPage(HttpServletRequest request){
		request.setAttribute("user", 1111);
		return "login";
	}

ModelAndView有model 和 view的功能 Model主要用于请求域共享数据。view主要用于设置视图用于页面跳转。

@RequestMapping("/mapper")
public ModelAndView testModelAndView(){

    ModelAndView  mv = new ModelAndView();
    mv.setObject("scope",11);
    mv.setViewName("success");

    return mv;
}

@RequestMapping("/testModel")
	public String testModel(Model model){
		model.addAttribute("name", "张三");
		
		return "error";
	}

@RequestMapping("/testMap")
	public String testMap(Map map){
		map.put("name", "张三");
		
		return "error";
	}

@RequestMapping("/testModelMap")
	public String testModelMap(testModelMap map){
		map.addAttribute("name", "张三");
		
		return "error";
	}

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 LinkHashMap{}

public class ExtendedModelMap extends ModelMap implements Model{}

public class BindingAwareModelMap extends ExtendedModelMap {}