Tomcat報錯
嚴重：The web application [web01] appears to have started a thread named [PooledThread-1] but has failed to stop it. This is very likely to create a memory leak.
沒有關閉ResultSet，PreparedStatement，Connection的后果。用完ResultSet，PreparedStatement，Connection對象后一定要關閉，不然占用很多內存。