java.sql.SQLException: No operations allowed after connection closed.Connection was implicitly clos
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出现这种情况是因为在数据库链接时，没有手动关闭资源，而是让JVM自动关闭资源的。Mysql服务器默认的“wait_timeout”是8小时，也就是说一个connection空闲超过8个小时，Mysql将自动断开该connection。可以每次建立数据链接时都创建对象，结束时，手动关闭一下，如：
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