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SpringMvc receives parameters

Jun 26, 2017 am 11:32 AM
springmvc parameter take over

接收参数的方式:
1.HttpServletRequest方式接收
 public ModelAndView test1(HttpServletRequest req){
        String userName = req.getParameter("userName");
        String password = req.getParameter("password");
        System.out.println(userName);
        System.out.println(password);
        return new ModelAndView("jsp/hello");
    }
2.@RequestParam方式
  public ModelAndView test2(String userName,
            @RequestParam("password") String pwd){
        System.out.println(userName+","+pwd);
        return new ModelAndView("jsp/hello");
    }
3.对象的方式接收
 public ModelAndView test3(User user){
        System.out.println(user);
        return new ModelAndView("jsp/hello");
    }
4.
   /**
* Use ModelAndView to pass out parameters. The Attribute of the internal HttpServletRequest is passed to the jsp page
* ModelAndView(String viewName,Map data)data is the processing result
*/
@RequestMapping("action")
public ModelAndView test4(User user){
     Map data = new HashMap();
     data.put("user", user);
     return new ModelAndView("jsp/hello",data);
}
 
5. Session的方式
/**
* session storage can be accessed using the getSession method of HttpServletRequest
*/
    @RequestMapping("action")
    public ModelAndView test7(HttpServletRequest req){
        HttpSession session = req.getSession();
        session.setAttribute("salary", 6000.0);
        return new ModelAndView("jsp/hello");
    }
 
6.重定向:
@RequestMapping("/updateitem")
//spirngMvc可以直接接收pojo类型:要求页面上input框的name属性名称必须等于pojo的属性名称
public ModelAndView updateitem(Items items){
 
itemsService.updateitems(items);
 
//不可以加斜杠 解析不了 itemList.action
return new ModelAndView(new RedirectView("itemList.action"));
}
 
7.重定向
@RequestMapping("/updateitem")
//spirngMvc可以直接接收pojo类型:要求页面上input框的name属性名称必须等于pojo的属性名称
public String updateitem(Items items){
 
itemsService.updateitems(items);
//重定向到action 可以加斜杠 redirect:/itemList.action 解析的了
return "redirect:itemList.action";
}
 
 
 

使用Model和ModelMap的效果一样,如果直接使用Model,springmvc会实例化ModelMap。

如果使用Model则可以不使用ModelAndView对象,Model对象可以向页面传递数据,View对象则可以使用String返回值替代。不管是Model还是ModelAndView,其本质都是使用Request对象向jsp传递数据。

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