Spring MVC的Model和ModelMap使用

不念不忘少年蓝@ 2021-07-24 18:03 368阅读 0赞

**一 控制器**

package org.fkit.controller;
    
    import org.fkit.domain.User;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.ui.ModelMap;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    
    // Controller注解用于指示该类是一个控制器，可以同时处理多个请求动作
    @Controller
    public class ModelController{
    
        @RequestMapping(value="/modelTest")
         public String modelTest(Model model){
            System.out.println("modelTest");
            User user = new User();
            // 设置user对象的username属性
            user.setUsername("疯狂软件1");
            // 将User对象添加到Model当中
            model.addAttribute("user", user);
            return "result1";
        }
        
        @RequestMapping(value="/ModelMapTest")
         public String ModelMapTest(ModelMap modelMap){
            System.out.println("ModelMapTest");
            User user = new User();
            // 设置user对象的username属性
            user.setUsername("疯狂软件2");
            // 将User对象添加到ModelMap当中
            modelMap.addAttribute("user", user);
            return "result2";
        }
    }

**二  领域模型**

package org.fkit.domain;
    import java.io.Serializable;
    // 域对象，实现序列化接口
    public class User implements Serializable{
         
         private static final long serialVersionUID = 1L;
         
         // 私有字段
         private String loginname;
         private String password;
         private String username;
         
         // 公共构造器
         public User() {
               super();
         }
         
         public User(String loginname, String password, String  username) {
               super();
               this.loginname = loginname;
               this.password = password;
               this.username = username;
         }
         // set/get方法
         public String getLoginname() {
               return loginname;
         }
         public void setLoginname(String loginname) {
               this.loginname = loginname;
         }
         public String getPassword() {
               return password;
         }
         public void setPassword(String password) {
               this.password = password;
         }
         public String getUsername() {
               return username;
         }
         public void setUsername(String username) {
               this.username = username;
         }
         @Override
         public String toString() {
               return "User [loginname=" + loginname + ", password="  + password
                         + ", username=" + username + "]";
         }
         
    }

**三 配置文件**

<?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:p="http://www.springframework.org/schema/p"
        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">
            
        
        <context:component-scan base-package="org.fkit.controller"/>
         
        <mvc:annotation-driven/>
         
        <mvc:default-servlet-handler/>
        
        
         <bean id="viewResolver"
               class="org.springframework.web.servlet.view.InternalResourceViewResolver"
              p:prefix="/WEB-INF/content/" p:suffix=".jsp"/>
        
    </beans>

**四 视图**

1 result1.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!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>测试Model</title>
    </head>
    <body>
    访问request作用范围域中的model对象：${requestScope.user.username  }
    
    </body>
    </html>

2 result2.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!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>测试modelMap</title>
    </head>
    <body>
    访问request作用范围域中的Model对象：${requestScope.user.username  }
    
    </body>
    </html>

**五 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2][]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/fda41c66464d445ca3f41167809c1076.png
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