“保存”按钮不会保存绘图的图像

Question

在我的java中有一个保存按钮，在完成绘图后保存绘图..

来自Button java（已更新）theres以及drawingArea.saveImage（）;

中的错误

   public void actionPerformed(ActionEvent e)
{
    if (e.getSource()==btnClear)
        drawingArea.clear();     
            else if (e.getSource()==infobutton)
            {
        //default title and icon
            JOptionPane.showMessageDialog(this,"Paint java created by bla bla bla bla bla blaa");
            }
            else if  (e.getSource()==colorBtn)
            {
                color = JColorChooser.showDialog(null,"LOL",color);
                drawingArea.setColorBtn(color);
            }
              else if  (e.getSource()==colorBg)
              {
                color = JColorChooser.showDialog(null,"LOL",color);
               drawingArea.setColorBg(color);
               drawingArea.repaint();
              }
                if(e.getSource()==save)
              {
                    drawingArea.saveImage();
        }

    }

这里是来自DrawingArea java（更新）

public void saveImage(DrawingArea drawingArea)
           throws FileNotFoundException, IOException
   {
       BufferedImage image=new BufferedImage(drawingArea.getWidth(), drawingArea.getHeight(),BufferedImage.TYPE_INT_RGB);
       Graphics2D g2=(Graphics2D)image.getGraphics();
       drawingArea.paint(g2);
    try {
        ImageIO.write(image, "png", new File("/tmp/drawingArea.png"));
    } catch (Exception e) {

    }
   }