爬取三一代理、西刺代理和无忧代理三个网站上的免费代理IP信息，并持久化到MySQL，表结构如下所示：
CREATE TABLE `proxy_ip_info` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`proxy_ip` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5085 DEFAULT CHARSET=utf8mb4;注：由于免费IP大概率无法使用，或者存活时间较短；且IP爬取的速率远高于IP校验，所以不建议在爬取信息的同时进行有效性校验。
挂代理访问待爬取的目标网站URL即可
通过并发 + 定时轮询，实现高效且持续的校验 详见源码
React
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