Itext 7 getNumberOfPages in QRCode in event Handler 从第 2 页开始，带有 END_PAGE

如何解决Itext 7 getNumberOfPages in QRCode in event Handler 从第 2 页开始，带有 END_PAGE

我有一个包含 2 页的文档，我在每页上生成一个 QR 码，并使用 getNumberOfPages() 将页数插入到 QR 文本中，但使用 END_PAGE 时，页数始终以 2 开头。它仅适用于 START_PAGE。

public interface IWetherFinder {
    public double getTemperature(String cityName);
    public double getTemperatureByZipcode(String zipCode);
}

class WeatherFinder implements IWetherFinder{
   @Override
   public double getTemperature(String cityName){
    // some logic to get temp by city
     return 40;
   }
  
    
   @Override
   public double getTemperatureByZipcode(String zipCode){
    String city = getCityName(zipCode);
   //some logic to get the temp by city name
     return 40;
   }
   

   private String getCityName(String zipCode) {
        return "Banaglore";
    }

}