域对象传参

1.ModelAndView

@Controller
public class HelloController {
    @RequestMapping("hell")//http://localhost:8080/hell.do
    public ModelAndView hello(){
        ModelAndView mv=new ModelAndView();
        /*
            模型数据：Model
            视图：View
         */
        //(值名字，传递的值）
        mv.addObject("hello","Hello SpringMVC");
        //jsp页面名字
        mv.setViewName("hello");
        return mv;
    }
}

2.其他方法

/**
 * 设置域对象属性
     * 1.ModelAndView
     * 2.ModelMap
     * 3.Model
     * 4.Map
     * 5，HttpServletRequest
 */
@Controller
public class ModelController {

    @RequestMapping("m1")
    public String fun1(HttpServletRequest request){
        request.setAttribute("hello","hello fun1");
        //返回视图名
        return "hello";
    }

    @RequestMapping("m2")
    public String fun2(ModelMap modelMap){
        modelMap.addAttribute("hello","hello fun2");
        //返回视图名
        return "hello";
    }

    @RequestMapping("m3")
    public String fun3(Model model){
        model.addAttribute("hello","hello fun2");
        //返回视图名
        return "hello";
    }

    @RequestMapping("m4")
    public String fun4(Map map){
        map.put("hello","hello fun2");
        //返回视图名
        return "hello";
    }

}
```JAVA