对象保存进MySQL数据库，从MySQL中读取出对象信息的源码

<div id="Article">
<h1><a href="https://www.2cto.com/database/" target="_blank" class="keylink">数据库</a>表设计：</h1>
<p>数据库名：db_file_test</p>
<p>表名：obj</p>
<p><img alt="\" height="345" src="/uploadfile/Collfiles/20171114/2017111409064361.jpg" width="516" /></p>
<h2>实体类：</h2>
<pre class="brush:java;">
package com.bean;

import java.io.Serializable;

public class User implements Serializable {