java IO 实现图片压缩

以下是Java IO实现图片压缩的示例代码：

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

public class ImageCompressor {
    
    /**
     * 压缩图片并保存到指定路径
     * @param srcPath 源图片路径
     * @param destPath 目标图片路径
     * @param quality 压缩质量（0.0-1.0）
     * @throws IOException
     */
    public static void compress(String srcPath, String destPath, float quality) throws IOException {
        File srcFile = new File(srcPath);
        BufferedImage srcImage = ImageIO.read(srcFile);
        Image destImage = srcImage.getScaledInstance(srcImage.getWidth(), srcImage.getHeight(), Image.SCALE_SMOOTH);
        BufferedImage destBufferedImage = new BufferedImage(srcImage.getWidth(), srcImage.getHeight(), BufferedImage.TYPE_INT_RGB);
        destBufferedImage.getGraphics().drawImage(destImage, 0, 0, null);
        ImageIO.write(destBufferedImage, "JPEG", new File(destPath));
    }
    
    public static void main(String[] args) throws IOException {
        String srcPath = "test.jpg";
        String destPath = "test_compressed.jpg";
        float quality = 0.5f;
        compress(srcPath, destPath, quality);
    }
}

该示例代码通过Java IO读取源图片，使用Java AWT对图片进行压缩，并使用Java IO将压缩后的图片保存到指定路径。其中，压缩质量通过参数传入，可以根据实际需求进行调整。