把带main方法的jar包直接放到linux环境下或windows环境下执行看效果，导出jar包然后执行命令过程

package hello;

import java.io.File;
import java.io.IOException;

public class AA {

	public static void main(String[] args) {
		String exportpath = "D:\AA\";		
		String fileName = "孟子乡.txt";				
		File file = new File(exportpath,fileName);
		try {
			file.createNewFile();
		} catch (IOException e) {			
			e.printStackTrace();
		}
	}

}

放到C盘执行方便：