Generating document preview - advanced Leave feedback

public static void getPreview()
{
    // The path to the documents directory.
    String filePath = "C:\signed.pdf";
 
    Signature signature = new Signature(filePath);
    try
    {
        // create preview options object
        PreviewOptions previewOption = new PreviewOptions(new PageStreamFactory() {
            @Override
            public OutputStream createPageStream(int pageNumber) {
                return generateStream(pageNumber);
            }
 
            @Override
            public void closePageStream(int pageNumber, OutputStream pageStream) {
                releasePageStream(pageNumber, pageStream);
            }
        });
        previewOption.setPreviewFormat(PreviewFormats.JPEG);
        previewOption.setHideSignatures(true);
        // generate preview
        signature.generatePreview(previewOption);
 
    }catch (Exception e){
        throw new GroupDocsSignatureException(e.getMessage());
    }
}
 
 
private static OutputStream generateStream(int pageNumber)
{
    try {
        Path path = Paths.get("C:\\GeneratePreviewHideSignatures\\");
 
        if (!Files.exists(path)) {
 
            Files.createDirectory(path);
            System.out.println("Directory created");
        } else {
 
            System.out.println("Directory already exists");
        }
        File filePath = new File(path+"\\image-"+pageNumber+".jpg");
 
        return new FileOutputStream(filePath);
    }catch (Exception e){
        throw new GroupDocsSignatureException(e.getMessage());
    }
 
}
 
private static void releasePageStream(int pageNumber, OutputStream pageStream)
{
    try {
        pageStream.close();
        String imageFilePath = new File("C:\\GeneratePreviewHideSignatures", "image-" +pageNumber +  ".jpg").getPath();
        System.out.print("Image file "+imageFilePath+" is ready for preview");
    }catch (Exception e){
        throw new GroupDocsSignatureException(e.getMessage());
    }
}