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public final class ConnectionUtil {
private ConnectionUtil() {}
private static final ThreadLocal<Connection> conn = new ThreadLocal<>();
public static Connection getConn() {
Connection con = conn.get();
if (con == null) {
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("url", "userName", "password");
conn.set(con);
} catch (ClassNotFoundException | SQLException e) {
// ...
}
}
return con;
}
}