读取文件夹内的所有图片并裁剪返回到指定文件夹。用于图片的快速裁剪，精修图片做不到，毕竟这是程序来做的。

package com.nbomb.route.test;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;public class ImageResize {public static void main(String[] args) {double SCALE_FACTOR = 1.15;String sourceFolderPath = "D:\\下载\\小红书";String targetFolderPath = "D:\\下载\\裁剪小红书";int targetWidth = 900;int targetHeight = 1200;File sourceFolder = new File(sourceFolderPath);File[] sourceFiles = sourceFolder.listFiles();for (File sourceFile : sourceFiles) {if (sourceFile.isFile() && isImageFile(sourceFile)) {try {BufferedImage sourceImage = ImageIO.read(sourceFile);int scaledWidth = (int) (sourceImage.getWidth() * SCALE_FACTOR);if (scaledWidth<900){scaledWidth = 1000;}int scaledHeight = (int) (sourceImage.getHeight() * SCALE_FACTOR);if (scaledHeight<1200){scaledHeight=1200;}BufferedImage scaledImage = scaleImage(sourceImage, scaledWidth, scaledHeight);BufferedImage resizedImage = cropImage(scaledImage, targetWidth, targetHeight);File targetFile = new File(targetFolderPath, sourceFile.getName());ImageIO.write(resizedImage, "jpg", targetFile);System.out.println("Processed: " + sourceFile.getName());} catch (IOException e) {e.printStackTrace();}}}}private static boolean isImageFile(File file) {String extension = getFileExtension(file).toLowerCase();return extension.endsWith("jpg") || extension.endsWith("jpeg") || extension.endsWith("png");}private static String getFileExtension(File file) {String fileName = file.getName();int indexOfLastDot = fileName.lastIndexOf(".");return indexOfLastDot != -1 && indexOfLastDot != 0 ? fileName.substring(indexOfLastDot + 1) : "";}private static BufferedImage scaleImage(BufferedImage sourceImage, int width, int height) {Image scaledImage = sourceImage.getScaledInstance(width, height, Image.SCALE_SMOOTH);BufferedImage bufferedImage = new BufferedImage(width, height, sourceImage.getType());Graphics2D g2d = bufferedImage.createGraphics();g2d.drawImage(scaledImage, 0, 0, null);g2d.dispose();return bufferedImage;}private static BufferedImage cropImage(BufferedImage sourceImage, int width, int height) {int x = (sourceImage.getWidth() - width) / 2;int y = (sourceImage.getHeight() - height) / 2;return sourceImage.getSubimage(x, y, width, height);}
}