Spring MVC 包装参数封装
在Spring MVC的应用过程中，我们在后端经过需要将表单数据封装在一个包装Pojo类型中，所谓包装Pojo类型，就是Pojo对象中包含另一个Pojo对象，如下所示：
/**
* 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 Address address;//封装地址信息
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>包装Pojo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：<input type="text" name="address.province"><br>
城市：<input type="text" name="address.city"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
注意：这里封装用户的地址信息，name为address.province这种写法，这代表把数据封装到User对象->Address对象的province属性中。
2 设计包装Pojo对象
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;
/**
* 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;
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
private Address address;//封装地址信息
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 +
'}';
}
}
3 编写Controller类
package com.yiidian.controller;
import com.yiidian.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* 包装Pojo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());
System.out.println("省份："+user.getAddress().getProvince());
System.out.println("城市："+user.getAddress().getCity());
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
控制台输出：
源码下载：https://pan.baidu.com/s/1QAceVkE0dLnajUJ_uowNTQ
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