java 图片质量压缩

/**
     * 图片质量压缩
     * @param file 要压缩的图片文件
     * @param input 文件输入流
     * @param quality 压缩质量（0-1）
     * @author ouyangyaxiong
     * 2016年2月23日 上午9:10:54
     * @throws IOException 
     *
     */
    public static void imgCompress(File file, InputStream input, float quality ) throws IOException{
        Iterator<ImageWriter> imgWriters = ImageIO.getImageWritersByFormatName("jpg");
        ImageWriter imgWriter = imgWriters.next();
        ImageWriteParam param = imgWriter.getDefaultWriteParam();
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionQuality(quality);
        OutputStream output = new FileOutputStream(file);//创建输出流
        ImageOutputStream imgOutput = ImageIO.createImageOutputStream(output);
        imgWriter.setOutput(imgOutput);
        BufferedImage bufferedImg = ImageIO.read(input);
        IIOImage iioimg = new IIOImage(bufferedImg, null, null);
        imgWriter.write(null, iioimg, param);
        output.close();
        imgOutput.close();
        imgWriter.dispose();
        
    }

注意：这里如果压缩透明背景的png图片会出现背景变黑的情况

参考：http://www.tutorialspoint.com/java_dip/image_compression_technique.htm,http://stackoverflow.com/questions/22812325/java-image-compression