怎么将数据存入session
默认数据都是存入request ,需要自己设置存入session 。

1.方式1 原生session代码

@RequestMapping("/selectUser")
public String  selectUser(HttpServletRequest request)
{
    User user=new User("zhangsan","123",23,new Address("湖北","武汉","汉口大道100号"));

    HttpSession session= request.getSession();

    session.setAttribute("sessionuser",user);

    return "showUser4";
}

测试取值:

${sessionScope.sessionuser.uname}

2.通过注解的方式
2.1先将值存入model

@Controller

//@SessionAttributes(value="sessionuser2")
@RequestMapping("/user4")
public class UserController4 {

 

    @RequestMapping("/selectUser2")
    public ModelAndView selectUser2()
    {
        User user=new User("zhangsan2","123",23,new Address("湖北","武汉","汉口大道100号"));

        User user2=new User("zhangsan22","123",23,new Address("湖北","武汉","汉口大道100号"));


        ModelAndView modelAndView=new ModelAndView();

        modelAndView.addObject("sessionuser2",user);

        modelAndView.addObject("user2",user2);

        modelAndView.setViewName("showUser5");


        return modelAndView;

    }
}

2.2在 类上加入注解

@SessionAttributes("存入model中的key")

@Controller
// 通过注解的方式将数据存入session
@SessionAttributes("sessionuser2")
//@SessionAttributes(value="sessionuser2")
@RequestMapping("/user4")
public class UserController4 {

 

    @RequestMapping("/selectUser2")
    public ModelAndView selectUser2()
    {
        User user=new User("zhangsan2","123",23,new Address("湖北","武汉","汉口大道100号"));

        User user2=new User("zhangsan22","123",23,new Address("湖北","武汉","汉口大道100号"));


        ModelAndView modelAndView=new ModelAndView();

        modelAndView.addObject("sessionuser2",user);

        modelAndView.addObject("user2",user2);

        modelAndView.setViewName("showUser5");


        return modelAndView;

    }
}