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public Connection getConn() {
try {
if (conn == null || conn.isClosed()) {
conn = DriverManager.getConnection(
"jdbc:mysql://124.173.158.2:3306/tianbao?autoReconnect=true&useUnicode=true&characterEncoding=utf-8",
"tianbao_f", "daige3");
}
} catch (SQLException e) {
e.printStackTrace();
System.out.println("getConnection()错误");
}
return conn;
}