Model与ModelMap

Spring MVC应用中，我们经常需要在Controller将数据传递到JSP页面，除了可以通过HttpServletRequest域传递外，Spring MVC还提供了两个Api，分别为Model接口和ModelMap类。接下来看看如何使用？

1 编写控制器数据存入域

package com.yiidian.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 *  Model与ModelMap的使用
 * 一点教程网 - www.yiidian.com
 */
@Controller
public class ModelController {

    /**
     * Model接口的使用
     * @return
     */
    @RequestMapping("/model")
    public String list(Model model){
        model.addAttribute("model","Model-一点教程网");
        return "success";
    }

    /**
     * ModelMap类的使用
     * @return
     */
    @RequestMapping("/modelMap")
    public String list(ModelMap modelMap){
        modelMap.addAttribute("modelMap","ModelMap-一点教程网");
        return "success";
    }
}

2 编写JSP获取域数据

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>一点教程网-提示页面</title>
</head>
<body>
获取Model数据-${requestScope.model}
<hr/>
获取ModelMap数据-${requestScope.modelMap}
</body>
</html>

3 springmvc.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 1.扫描Controller的包-->
    <context:component-scan base-package="com.yiidian.controller"/>

    <!-- 2.配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 2.1 页面前缀 -->
        <property name="prefix" value="/pages/"/>
        <!-- 2.2 页面后缀 -->
        <property name="suffix" value=".jsp"/>
    </bean>

    <!-- 3.创建处理器适配器和处理器映射器-->
    <mvc:annotation-driven/>
</beans>