base64图片压缩示例

爱被打了一巴掌 2023-09-30 09:21 1阅读 0赞

> 压缩图片大小

@Log4j2
    public class Base64Util {
        
    
        /**
         * 压缩图片在40k内
         *
         * @param base64Img
         * @return
         */
        public static String resizeImageTo40K(String base64Img) {
        
            try {
        
                BufferedImage src = base64String2BufferedImage(base64Img);
                BufferedImage output = Thumbnails.of(src).size(src.getWidth() / 3, src.getHeight() / 3).asBufferedImage();
                String base64 = imageToBase64(output);
                if (base64.length() - base64.length() / 8 * 2 > 40000) {
        
                    output = Thumbnails.of(output).scale(1 / (base64.length() / 40000)).asBufferedImage();
                    base64 = imageToBase64(output);
                }
                return base64;
            } catch (Exception e) {
        
                return base64Img;
            }
        }
    
    
        /**
         * base64转换成BufferedImage
         *
         * @param base64string
         * @return
         */
        public static BufferedImage base64String2BufferedImage(String base64string) {
        
            BufferedImage image = null;
            try {
        
                InputStream stream = BaseToInputStream(base64string);
                image = ImageIO.read(stream);
            } catch (IOException e) {
        
                log.info("");
            }
            return image;
        }
    
        /**
         * Base64转换成InputStream
         *
         * @param base64string
         * @return
         */
        private static InputStream BaseToInputStream(String base64string) {
        
            ByteArrayInputStream stream = null;
            try {
        
                BASE64Decoder decoder = new BASE64Decoder();
                byte[] bytes1 = decoder.decodeBuffer(base64string);
                stream = new ByteArrayInputStream(bytes1);
            } catch (Exception e) {
        
                // TODO: handle exception
            }
            return stream;
        }
    
        /**
         * BufferedImage转换成base64
         *
         * @param bufferedImage
         * @return
         */
        public static String imageToBase64(BufferedImage bufferedImage) {
        
            Base64 encoder = new Base64();
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            try {
        
                ImageIO.write(bufferedImage, "jpg", baos);
            } catch (IOException e) {
        
                log.info("");
            }
            return new String(encoder.encode((baos.toByteArray())));
        }
    
    }