mvc获取主机域名

public ActionResult Index()
{
    string hostName = Request.Url.Host;
    // 其他逻辑
    return View();
}

@Controller
public class HomeController {

    @RequestMapping("/")
    public String index(HttpServletRequest request) {
        String hostName = request.getServerName();
        // 其他逻辑
        return "index";
    }
}

public class HomeController : Controller
{
    private readonly IConfiguration _configuration;

    public HomeController(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    public IActionResult Index()
    {
        string hostName = _configuration.GetValue<string>("HostName");
        // 其他逻辑
        return View();
    }
}

@Controller
public class HomeController {

    @Value("${app.host}")
    private String hostName;

    @RequestMapping("/")
    public String index() {
        // 其他逻辑
        return "index";
    }
}