// 自定义验证码图片背景
SimpleBackgroundFactory backgroundFactory = new SimpleBackgroundFactory(alpha);
configurableCaptchaService.setBackgroundFactory(backgroundFactory);
// 图片滤镜设置
ConfigurableFilterFactory filterFactory = new ConfigurableFilterFactory();
java.util.List<BufferedImageOp> filters = new ArrayList<BufferedImageOp>();
WobbleImageOp wobbleImageOp = new WobbleImageOp();
wobbleImageOp.setEdgeMode(BufferedImage.TYPE_INT_ARGB);
wobbleImageOp.setxAmplitude(X_AMPLITUDE);
wobbleImageOp.setyAmplitude(Y_AMPLITUDE);
filters.add(wobbleImageOp);
filterFactory.setFilters(filters);
configurableCaptchaService.setFilterFactory(filterFactory);
// 文字渲染器设置
textRenderer = new BestFitTextRenderer();