所谓包装POJO，就是一在个POJO中包含另一个简单POJO。示范：用户的证件信息。
一、假定基本环境已经具备
二、创建POJO类（两个）
package com.itheima.po; /** * 个人持久化类 */ public class Person { private Integer id; private String name; private Integer age; private String sex; private IdCard card; //个人关联的证件 public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public IdCard getCard() { return card; } public void setCard(IdCard card) { this.card = card; } @Override public String toString() { return "Person [id=" + id + ", name=" + name + ", " + "age=" + age + ", sex=" + sex + ", card=" + card + "]"; } }
package com.itheima.po; /** * 证件持久化类 */ public class IdCard { private Integer id; private String code; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getCode() { return code; } public void setCode(String code) { this.code = code; } @Override public String toString() { return "IdCard [id=" + id + ", code=" + code + "]"; } }
三、创建前台表单页面form3.jsp，位于：mvc目录
<%@ 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>提交POJO类型2</title> </head> <body> <form action="../hello/pojoParameter2" method="post"> 用户id:<input type="text" name="id" value="2"></br> 用户名:<input type="text" name="name" value="Andy"></br> 年龄:<input type="text" name="age" value="30"></br> 性别:<input type="text" name="sex" value="男"></br> 证件id:<input type="text" name="card.id" value="1234"></br> 证件编码:<input type="text" name="card.code" value="321001198701019012"></br> <input type="submit" value="提交"> </form> </body> </html>
注意：【证件id】和【证件编码】中name的写法，它的前缀不是IdCard的类名，而是Person类中IdCard类对应的变量名
四、创建后台控制器类
package com.itheima.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import com.itheima.po.Person; @Controller @RequestMapping(value = "/hello") public class POJOController2 { @RequestMapping("/pojoParameter2") public String pojoParameter(Person person){ System.out.println(person); return "success"; } }
五、测试，打开网页：http://localhost:8080/ssm/mvc/form3.jsp
提交，后台显示：
