thumb

gistfile1.txt

public class ImageCompressUtil {


    /**
     * 强制压缩/放大图片到固定的大小
     *
     * @param fileName     压缩文件("c:\\1.png")
     * @param targetHeight
     * @param targetWidth
     * @return
     */
    public static BufferedImage resize(String fileName, int targetWidth, int targetHeight) {
        BufferedImage img = null;//原图
        BufferedImage compressImg = null;//压缩后图
        int width, height;
        try {
            File file = new File(fileName);
            img = ImageIO.read(file);

            double srcHeight = img.getHeight();
            double srcWidth = img.getWidth();

            if (img.getWidth() > img.getHeight()) {
                // 宽
                double scalingFactor = targetWidth / srcWidth;
                width = targetWidth;
                height = (int) (img.getHeight() * scalingFactor);
            } else {
                // 高
                double scalingFactor = targetWidth / srcHeight;
                width = (int) (img.getWidth() * scalingFactor);
                height = targetHeight;
            }

            compressImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            compressImg.getGraphics().drawImage(img, 0, 0, width, height, null); // 绘制缩小后的图
        } catch (IOException e) {
            e.printStackTrace();
        }
        return compressImg;
    }

    /**
     * @param file 存放位置("c:\\1.png")
     * @param img
     */
    public static void writeToFile(String file, BufferedImage img) {
        try {
            File destFile = new File(file);
            FileOutputStream out = new FileOutputStream(destFile); // 输出到文件流
            ImageIO.write(img, "png", out);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}