java图片无损压缩

一，提供一张原图，原图大小2.1mb

 

 

 二，处理后图片大小对比,大小772kb,对比原图占用内存减少三分之二

 

 

 

  三 ，java代码

 

/**
     * 
     * @param srcFilePath 原图路径
     * @param descFilePath 保存路径
     * @return
     * @throws IOException
     */
    public static boolean compressPic(String srcFilePath, String descFilePath) throws IOException  {
        File file = null;
        BufferedImage src = null;
        FileOutputStream out = null;
        // 指定写图片的方式为 jpg
        ImageWriter  imgWrier = ImageIO.getImageWritersByFormatName("jpg").next();
        ImageWriteParam imgWriteParams = new ImageWriteParam(null);
        // 要使用压缩，必须指定压缩方式为MODE_EXPLICIT
        imgWriteParams.setCompressionMode(imgWriteParams.MODE_EXPLICIT);
        // 这里指定压缩的程度，参数qality是取值0~1范围内，
        imgWriteParams.setCompressionQuality((float)1);
        imgWriteParams.setProgressiveMode(imgWriteParams.MODE_DISABLED);
        ColorModel colorModel = ImageIO.read(new File(srcFilePath)).getColorModel();// ColorModel.getRGBdefault();

        imgWriteParams.setDestinationType(new javax.imageio.ImageTypeSpecifier(
                colorModel, colorModel.createCompatibleSampleModel(16, 16)));
        try {
            if (StringUtils.isEmpty(srcFilePath)) {
                return false;
            } else {
                file = new File(srcFilePath);
                System.out.println(file.length());
                src = ImageIO.read(file);
                out = new FileOutputStream(descFilePath);
                imgWrier.reset();
                // 必须先指定 out值，才能调用write方法, ImageOutputStream可以通过任何
                // OutputStream构造
                imgWrier.setOutput(ImageIO.createImageOutputStream(out));
                // 调用write方法，就可以向输入流写图片
                imgWrier.write(null, new IIOImage(src, null, null),
                        imgWriteParams);
                out.flush();
                out.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

 

public static void main(String[] args) throws IOException {
        String stpa="D:\\文件表\\test1.jpg";
        String st1="D:\\文件表\\test2.jpg";
        compressPic(stpa, st1);
    }

 

来源：https://www.cnblogs.com/KdeS/p/11898805.html