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>