无法从单个图像保存多个图像opencv（Java）

我正在使用opencv 3.1和Eclipse将图像分割成更多的图像。 问题是，当我试图保存它们时，仅保存9个图像中的第一个（例如）。 奇怪的是，控制台显示图像已保存，但我只能看到一个。 代码如下：

import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Range;
import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class prova {

public static void main(String[] args) {
    // TODO Auto-generated method stub

    System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); 

    Imgcodecs imageCodecs = new Imgcodecs(); 

       String file 
="C:/Users/Zast/Desktop/workspacePR2/tesina/images/img.jpg"; 
      Mat mat= imageCodecs.imread(file); 

      System.out.println("Image Loaded");     



   // Creating an empty matrix to store the result
     // Mat dst = new Mat();

       for (int i=0; i<3; i++){
             for (int j=0; j<3; j++){
            int a1=i*200;
            int b1=i*200+199;
            int a2=j*200; 
            int b2=j*200+199;
            Mat mat2= mat.submat(a1,b1,a2,b2); 
            imshow ("filtro", mat2);

            String file2 = 
"C:/Users/Zast/Desktop/workspacePR2/tesina/images/img1.jpg";

            imageCodecs.imwrite(file2, mat2); 
            System.out.println("Image Saved ............"); 
             }}
}



    private static String String(int i) {

    return null;
}



    public static void imshow(String windowname, Mat m){
        int type = BufferedImage.TYPE_BYTE_GRAY;
        if ( m.channels() > 1 ) 
            type = BufferedImage.TYPE_3BYTE_BGR;
        int bufferSize = m.channels()*m.cols()*m.rows();
        byte [] b = new byte[bufferSize];
        m.get(0,0,b); // get all the pixels
        BufferedImage image = new BufferedImage(m.cols(),m.rows(), type);
        final byte[] targetPixels = ((DataBufferByte) 
        image.getRaster().getDataBuffer()).getData();
        System.arraycopy(b, 0, targetPixels, 0, b.length);
        ImageIcon icon=new ImageIcon(image);
        JFrame frame=new JFrame(windowname);
        JLabel lbl=new JLabel(icon);
        frame.add(lbl);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

      System.out.println("Image Processed");
   } }

Image Loaded
Image Processed
Image Saved ............
Image Processed
Image Saved ............
Image Processed
Image Saved ............
Image Processed
Image Saved ............
Image Processed
Image Saved ............
Image Processed
Image Saved ............
Image Processed
Image Saved ............
Image Processed
Image Saved ............
Image Processed
Image Saved ............

---

如果输出的文件名在for循环的每次迭代中始终相同。。。。然后您将只保存一个文件（应该是最后一个您处理的文件）。。。试着在每次迭代中改变“img1.jpg”，比如img2.jpg、img3.jpg等等，它奏效了，我错过了这件事。非常感谢：D。