Java如何压缩照片为指定像素大小

你可以使用Java的图像处理库来压缩照片为指定像素大小。下面是一个示例代码：

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

public class ImageCompressor {
    public static void main(String[] args) {
        String inputImagePath = "input.jpg";
        String outputImagePath = "output.jpg";
        int newWidth = 800;
        int newHeight = 600;

        try {
            BufferedImage inputImage = ImageIO.read(new File(inputImagePath));
            BufferedImage outputImage = new BufferedImage(newWidth, newHeight, inputImage.getType());

            Graphics2D graphics2D = outputImage.createGraphics();
            graphics2D.drawImage(inputImage, 0, 0, newWidth, newHeight, null);
            graphics2D.dispose();

            ImageIO.write(outputImage, "jpg", new File(outputImagePath));

            System.out.println("Image compressed successfully!");
        } catch (IOException ex) {
            System.out.println("Error while compressing image.");
            ex.printStackTrace();
        }
    }
}

你需要将inputImagePath变量替换为你要压缩的照片路径，outputImagePath变量替换为压缩后的照片路径，newWidth和newHeight变量替换为你想要的像素大小。这个示例将会将照片压缩为800x600像素大小。压缩后的照片将会保存在outputImagePath指定的路径中