Model/ModelMap 和 ModelAndView 的区别使用

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mob604756f1c0ca 2018-06-26 17:36:00

文章标签 html spring java 3c mvc 文章分类 代码人生

Model/ModelMap 和 ModelAndView 的区别使用

Model/ModelMap

controller:

package springmvc.controller;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import springmvc.model.User;

@Controller
public class HelloController {

    private static final Log logger = LogFactory.getLog(HelloController.class);

    @ModelAttribute
    public void userModel(String name, String password, Model model)
    {
        logger.info("userModel");
        //创建userModel
        User user = new User();
        user.setName(name);
        user.setPassword(password);
        //user对象存在model当中
        model.addAttribute("user", user);
    }


    @RequestMapping(value="/hello", method=RequestMethod.GET)
    public String hello()
    {      
        return "index";
    }


    @RequestMapping(value="/login", method=RequestMethod.POST)
    public String post(Model model)
    {
        //从model中取出之前存的user对象
        User user = (User) model.asMap().get("user");
        System.out.println(user);
        //设置user对象
        user.setName("测试");
        model.addAttribute("sucess", "ok");
        System.out.println(user);
        return "post";
    }








}

jsp:

index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>hello-index</title>
</head>
<body>


<form:form method="post" action="/gu2/login" modelAttribute="user">
  姓名：<form:input path="name"  id="name"/>
  <br>
  密码：<form:password path="password" id="password"/>
  <br>
  <input type="submit" vlaue="提交">
</form:form>



</body>
</html>

post.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"   pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page isELIgnored="false"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>post</title>
</head>
<body>

<h3>post</h3>
name: ${user.name}<br>
passwod: ${user.password}<br>
${sucess}

</body>
</html>

ModelAndView

controller:

package springmvc.controller;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import springmvc.model.User;

@Controller
public class Hello2Controller {


  private static final Log logger = LogFactory.getLog(Hello2Controller.class);

  @ModelAttribute
  public void userModel(String name, String password, ModelAndView mv)
  {
    logger.info("usermodel");
    User user = new User();
    user.setName(name);
    user.setPassword(password);

    mv.addObject("user", user);
  }

  @RequestMapping(value="/h2", method=RequestMethod.GET)
  public ModelAndView  index()
  {
    //return new ModelAndView("hello2_index", "commond", new User());
     return new ModelAndView("h2_index", "command", new User());
  }

  @RequestMapping(value="/lh2",method=RequestMethod.POST)
  public ModelAndView post( ModelAndView mv)
  {
    logger.info("hello2_index_h2");
    //从modelAndView中的model里获取user
    User user = (User) mv.getModel().get("user");
    System.out.println(user);

    if( user !=null)
      user.setName("ccccc");

    mv.setViewName("h2_post");
    return mv;
  }

}

jsp

index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>h2-index</title>
</head>
<body>


<form:form method="post" action="/gu2/lh2" command="user">
  name: <form:input path="name" id="name"/>
  password: <form:input path="password" id="password"/>
  <input type="submit" value="提交"/>
</form:form>

</body>
</html>

h2_post.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"   pageEncoding="utf-8"%>
<%@ page isELIgnored="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>h2-post</title>
</head>
<body>

<h3>post</h3>
name: ${user.name}<br>
password:  ${user.password}<br>


</body>
</html>