第5次的失败原因：
Cannot create PoolableConnectionFactory (Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
MySQL 并发测试中，线程数和数据库连接池的实验
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转载自www.cnblogs.com/qianjinyan/p/10249332.html
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