asp.net core通过hosting.json指定web启动时的端口号

{
  "server.urls": "http://*:5000;http://*:8001",
  "environment": "Development"
}

public static void Main(string[] args)
        {
            CreateWebHostBuilder(args)
                .Build()
                .Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args)
        {
            var config = new ConfigurationBuilder()
                   .AddJsonFile("hosting.json", optional: true)   //增加hosting.json
                   .Build();

            return WebHost
                    .CreateDefaultBuilder(args)
                    .UseConfiguration(config)
                    .UseStartup<Startup>();
        }