ImageUtil.java 文件源码

/**
 * 根据质量压缩图片，不改变图片的尺寸
 * 
 * @param imgContent
 *            图片内容
 * @param quality
 *            缩放比例
 * @param extName
 *            后缀名
 * @return
 */
public byte[] compress(byte[] imgContent, float quality, String extName) {
    if (quality > 1 || quality <= 0 || imgContent == null || WakaUtils.string.isEmpty(extName)) {
        throw new ZhhrUtilException("压缩文件失败！入参为空");
    }
    try (InputStream is = new ByteArrayInputStream(imgContent);
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            ImageOutputStream ios = ImageIO.createImageOutputStream(os);) {
        BufferedImage image = ImageIO.read(is);

        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName(extName);
        ImageWriter writer = writers.next();
        writer.setOutput(ios);

        ImageWriteParam param = writer.getDefaultWriteParam();
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionQuality(quality);

        writer.write(null, new IIOImage(image, null, null), param);
        writer.dispose();

        return os.toByteArray();
    } catch (IOException e) {
        throw new ZhhrUtilException(e.getMessage(), e);
    }
}