java 压缩图片存储(jpg/png)

public class ImageCompressUtil {
    
    

    public static void reduceImg(String imgsrc, String imgdist) {
    
    
        try {
    
    
            File srcfile = new File(imgsrc);
            // 检查图片文件是否存在
            if (!srcfile.exists()) {
    
    
                System.out.println("文件不存在");
            }
            int[] results = getImgWidthHeight(srcfile);

            int widthdist = results[0];
            int heightdist = results[1];
            // 开始读取文件并进行压缩
            Image src = ImageIO.read(srcfile);

            // 构造一个类型为预定义图像类型之一的 BufferedImage
            BufferedImage tag = new BufferedImage( widthdist,  heightdist, BufferedImage.TYPE_INT_RGB);



            // 这边是压缩的模式设置
            tag.getGraphics().drawImage(src.getScaledInstance(widthdist, heightdist, Image.SCALE_SMOOTH), 0, 0, null);

            //创建文件输出流
            FileOutputStream out = new FileOutputStream(imgdist);
            //将图片按JPEG压缩,保存到out中
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(tag);
            //关闭文件输出流
            out.close();
        } catch (Exception ef) {
    
    
            ef.printStackTrace();
        }
    }


    public static void reduceImg(InputStream imgsrc, String imgdist) throws IOException {
    
    




            Image src = ImageIO.read(imgsrc);

            int[] results = getImgWidthHeight(src);

            int widthdist = results[0];
            int heightdist = results[1];
            // 开始读取文件并进行压缩



            // 构造一个类型为预定义图像类型之一的 BufferedImage
            BufferedImage tag = new BufferedImage( widthdist,  heightdist, BufferedImage.TYPE_INT_RGB);

            // 这边是压缩的模式设置
            tag.getGraphics().drawImage(src.getScaledInstance(widthdist, heightdist, Image.SCALE_SMOOTH), 0, 0, null);

            //创建文件输出流
            FileOutputStream out = new FileOutputStream(imgdist);
            //将图片按JPEG压缩,保存到out中
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(tag);
            //关闭文件输出流
            out.close();
            imgsrc.close();
    }






    /**
     * 获取图片宽度和高度
     *
     * @param file 图片路径
     * @return 返回图片的宽度
     */
    public static int[] getImgWidthHeight(File file) {
    
    
        InputStream is = null;
        BufferedImage src = null;
        int result[] = {
    
     0, 0 };
        try {
    
    
            // 获得文件输入流
            is = new FileInputStream(file);
            // 从流里将图片写入缓冲图片区
            src = ImageIO.read(is);
            // 得到源图片宽
            result[0] =src.getWidth(null);
            // 得到源图片高
            result[1] =src.getHeight(null);
            is.close();  //关闭输入流
        } catch (Exception ef) {
    
    
            ef.printStackTrace();
        }

        return result;
    }


    public static int[] getImgWidthHeight(Image image) {
    
    


        int result[] = {
    
     0, 0 };
        try {
    
    
            // 得到源图片宽
            result[0] =image.getWidth(null);
            // 得到源图片高
            result[1] =image.getHeight(null);
        } catch (Exception ef) {
    
    
            ef.printStackTrace();
        }
        return result;
    }


}

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转载自blog.csdn.net/dndndnnffj/article/details/109641963