等比例缩放多个图片

淩亂°似流年 2023-10-10 18:40 40阅读 0赞

最新做了一个等比例缩放多个图片，保证所有图片宽高相等并不失真的功能，现将代码粘贴出来。

import javax.imageio.ImageIO;
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    
    public class ScaleImage {
        
        public static void main(String[] args) throws IOException {
        
            // 需要合并的图片文件列表
            List<String> imageFiles = new ArrayList<>();
            File file = new File("E:\\ysj");
            File[] files = file.listFiles();
    
            for (int i = 0; i < files.length; i++) {
        
                imageFiles.add(files[i].getName());
                System.err.println(files[i].getName());
            }
            for (String imageFile : imageFiles) {
        
                //加载图片
                File f = new File("E:\\ysj\\" + imageFile);
                BufferedImage image = ImageIO.read(f);
                BufferedImage imag = scaleImage(image, 2400, 4600);
                String[] split = imageFile.split("\\.");
                //保存图片
                File targetFile = new File("E:\\newYsj\\"+ split[0] + ".jpg");
                ImageIO.write(imag, "jpg", targetFile);
            }
        }
    
        // 等比例缩放图片
        private static BufferedImage scaleImage(BufferedImage img, int maxWidth, int maxHeight) {
        
            int width = img.getWidth();
            int height = img.getHeight();
    
            // 计算缩放比例
            double scale = Math.min((double)maxWidth/width, (double)maxHeight/height);
    
            // 缩放后的图片宽度和高度
            int newWidth = (int)(width * scale);
            int newHeight = (int)(height * scale);
    
            // 创建缩放后的图片
            BufferedImage scaledImage = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2d = scaledImage.createGraphics();
            g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g2d.drawImage(img, 0, 0, newWidth, newHeight, null);
            g2d.dispose();
    
            return scaledImage;
        }
    }