Atlantic City’s casinos won about 4 percent more from gamblers in September than they did a year earlier. Figures released Thursday by the New Jersey Division of Gaming Enforcement show the seven casinos and online gambling outlets won $235.8 million, an increase of 4.1 percent compared with September 2016. When the now-shuttered Trump Taj Mahal is excluded, Atlantic City’s casino revenue was up by 7.9 percent from a year ago. The Trump Taj Mahal shut down last October. Matthew Levinson, chairman of the Casino Control Commission, said that gaming revenue is up more than 9 percent over the last nine months. “This isn’t just luck. Business is building,” he said.