JAVA: Summary of SpringMvc receiving parameter methods

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How to receive parameters:

1.HttpServletRequest method to receive

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 method

 public ModelAndView test2(String userName,
      @RequestParam("password") String pwd){
    System.out.println(userName+","+pwd);
    return new ModelAndView("jsp/hello");
  }

3.Objectmethod to receive

 public ModelAndView test3(User user){
    System.out.println(user);
    return new ModelAndView("jsp/hello");
  }

4.

 /**
  * 使用ModelAndView传出参数 内部 HttpServletRequest的Attribute传递 到jsp页面
　　　* ModelAndView(String viewName,Map data)data是处理结果
  */
@RequestMapping("action")
public ModelAndView test4(User user){
   Map<String, Object> data = new HashMap<String, Object>();
   data.put("user", user);
   return new ModelAndView("jsp/hello",data);
}

5. Session way

/**
   * session存储  可以使用HttpServletRequest的getSession方法访问
   */
  @RequestMapping("action")
  public ModelAndView test7(HttpServletRequest req){
    HttpSession session = req.getSession();
    session.setAttribute("salary", 6000.0);
    return new ModelAndView("jsp/hello");
  }

6. Redirect:

@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. Redirect

@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";
}

The effect of using Model and ModelMap is the same. If you use Model directly, springmvc will instantiate ModelMap.

If you use Model, you don’t need to use the ModelAndView object. The Model object can pass data to the page, and the View object can use the String return value instead. Whether it is Model or ModelAndView, the essence is to use the Request object to transfer data to jsp.

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