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// For complete examples and data files, please go to https://github.com/groupdocs-viewer/GroupDocs.Viewer-for-Java
try {
	// Setup GroupDocs.Viewer config
	ViewerConfig config = Utilities.getConfiguration();
	// Create image handler
	ViewerImageHandler imageHandler = new ViewerImageHandler(config);
	String guid = fileName;

	// Perform page reorder
	ReorderPageOptions options = new ReorderPageOptions(pageNumber, newPosition);
	imageHandler.reorderPage(guid, options);

	ImageOptions imageOptions = new ImageOptions();
	imageOptions.setTransformations(Transformation.Reorder);

	List<PageImage> pages = imageHandler.getPages(guid, imageOptions);
	int pageNumberCount = 1;
	for (PageImage page : pages) {
		Utilities.saveAsImage(pageNumberCount + "_" + fileName, "png", page.getStream());
		pageNumberCount++;
	}

} catch (Exception exp) {
	System.out.println("Exception: " + exp.getMessage());
	exp.printStackTrace();
}