使用ImageIO编写具有透明度的BMP

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

public class TransparentBMPWriter {
    public static void main(String[] args) {
        int width = 200;
        int height = 200;

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

        // 设置透明度
        int alpha = 128; // 0-255，128表示半透明
        Color transparentColor = new Color(0, 0, 0, alpha);
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                image.setRGB(x, y, transparentColor.getRGB());
            }
        }

        // 写入图像数据
        try {
            File outputFile = new File("transparent_image.bmp");
            ImageIO.write(image, "BMP", outputFile);
            System.out.println("具有透明度的BMP文件已成功创建。");
        } catch (IOException e) {
            System.out.println("创建具有透明度的BMP文件时出错：" + e.getMessage());
        }
    }
}