2021-05-03 10:13  阅读(140)
文章分类:Spring MVC 教程 文章标签:SpringSpring MVC
©  原文作者:一点教程 原文地址:http://www.yiidian.com/springmvc/

上节我们利用List集合来封装多个地址信息,其实把List集合换成Map集合也是可以的。下面,看看Spring MVC如何使用Map集合类型封装表单参数?

1 设计表单

    
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>一点教程网 - www.yiidian.com</title>
    </head>
    <body>
    <h2>Map集合类型参数封装</h2>
    <form action="/param.do" method="post">
        用户名:<input type="text" name="username"><br>
        年龄:<input type="text" name="age"><br>
        省份1:<input type="text" name="address['a1'].province"><br>
        城市1:<input type="text" name="address['a1'].city"><br>
        省份2:<input type="text" name="address['a2'].province"><br>
        城市2:<input type="text" name="address['a2'].city"><br>
        <input type="submit" value="提交">
    </form>
    </body>
    </html>
    

注意:这里的address['a1'].city,a1是赋值给Map的key,city是赋值给Address的city属性

2 设计Pojo

Address对象:

    
    package com.yiidian.domain;
    
    /**
     * 封装用户的地址信息
     * 一点教程网 - www.yiidian.com
     */
    public class Address {
        private String province;
        private String city;
    
        public String getProvince() {
            return province;
        }
        public void setProvince(String province) {
            this.province = province;
        }
        public String getCity() {
            return city;
        }
        public void setCity(String city) {
            this.city = city;
        }
    
        @Override
        public String toString() {
            return "Address{" +
                    "province='" + province + '\'' +
                    ", city='" + city + '\'' +
                    '}';
        }
    }
    

User对象:

    
    package com.yiidian.domain;
    
    import java.util.List;
    import java.util.Map;
    
    /**
     * 用于封装表单数据
     * 一点教程网 - www.yiidian.com
     */
    public class User {
        private String username;
        private Integer age;
    
        private Map<String,Address> address;//这里使用Map集合接收表单多个地址信息
    
        public Map<String, Address> getAddress() {
            return address;
        }
    
        public void setAddress(Map<String, Address> address) {
            this.address = address;
        }
    
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username;
        }
    
        public Integer getAge() {
            return age;
        }
    
        public void setAge(Integer age) {
            this.age = age;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "username='" + username + '\'' +
                    ", age=" + age +
                    ", address=" + address +
                    '}';
        }
    
    }
    

在User对象使用Map集合来封装多个地址信息

3 编写Controller

    
    package com.yiidian.controller;
    import com.yiidian.domain.Address;
    import com.yiidian.domain.User;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import java.util.Map;
    
    /**
     * Map集合参数封装
     * 一点教程网 - www.yiidian.com
     */
    @Controller
    public class ParamController {
    
        @RequestMapping("/param.do")
        public String save(User user){
            System.out.println("用户名:"+user.getUsername());
            System.out.println("年龄:"+user.getAge());
            //遍历所有地址信息
            Map<String, Address> address = user.getAddress();
            for(Map.Entry entry:address.entrySet()){
                System.out.println(entry.getKey()+"--"+entry.getValue());
            }
            return "success";
        }
    }
    

4 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>

5 运行测试

202105031013241891.png

控制台输出:

202105031013246232.png

源码下载:https://pan.baidu.com/s/1MqqrdwtcrCLVJUggRfMTeg

点赞(0)
版权归原创作者所有,任何形式转载请联系作者; Java 技术驿站 >> Spring MVC Map集合参数封装
上一篇
Spring MVC List集合参数封装
下一篇
Spring MVC 自定义类型转换