写一段代码java数组输入长和宽以及旋转角度，输出旋转后的像素

在Java中，我们可以创建一个矩阵类，然后通过给定的长、宽和旋转角度来实现像素矩阵的旋转。这里是一个简单的示例，我们将使用`BufferedImage`类来处理像素数据：

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

public class PixelRotation {
    public static BufferedImage rotateImage(int width, int height, int angle, String inputFilePath) {
        BufferedImage originalImage = ImageIO.read(new File(inputFilePath));
        
        // 计算新的宽度和高度
        double newAspectRatio = (double)width / height;
        double oldAspectRatio = (double)originalImage.getWidth() / originalImage.getHeight();
        int rotatedWidth = (int)Math.ceil(height * Math.sqrt(newAspectRatio * oldAspectRatio));
        int rotatedHeight = (int)Math.floor(width * Math.sqrt(newAspectRatio * oldAspectRatio));

        BufferedImage rotatedImage = new BufferedImage(rotatedWidth, rotatedHeight, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = rotatedImage.createGraphics();

        // 旋转图像并填充背景
        g2d.setTransform(AffineTransform.getRotateInstance(Math.toRadians(angle), rotatedImage.getWidth() / 2, rotatedImage.getHeight() / 2));
        g2d.drawRenderedImage(originalImage, null);

        return rotatedImage;
    }

    public static void main(String[] args) {
        int length = 50; // 长度
        int width = 75;   // 宽度
        int angle = 45; // 旋转角度
        String inputPath = "input.jpg"; // 输入文件路径

        try {
            BufferedImage rotated = rotateImage(length, width, angle, inputPath);
            File outputFile = new File("rotated_" + angle + ".jpg");
            ImageIO.write(rotated, "jpg", outputFile);
            System.out.println("Rotated image saved as " + outputFile.getAbsolutePath());
        } catch (Exception e) {
            System.err.println("Error rotating image: " + e.getMessage());
        }
    }
}

在这个例子中，我们首先读取输入图片，然后计算旋转后的新尺寸，接着创建一个新的图像并应用旋转变换。最后，我们将旋转后的图像保存到指定路径。