今天用jdbc连接MySQL 怎么连接都是Communications link failure，网上查了一圈资料，基本都是mysql﹥ show global variables like ‘wait_timeout‘; wait_timeout的设置问题，按照他们的改了后，还是failure，我还以为是connect/j的版本问题，瞄了一圈，后来发现url写错了，localhost写成了localhose！
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