java图片旋转90度_Java实现图片内容无损任意角度旋转

可以使用Java的Graphics2D类实现图片内容无损任意角度旋转。以下是一个示例代码：

import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;

public class ImageRotation {
    public static BufferedImage rotate(BufferedImage image, double angle) {
        int width = image.getWidth();
        int height = image.getHeight();

        BufferedImage rotated = new BufferedImage(width, height, image.getType());

        Graphics2D g = rotated.createGraphics();
        g.rotate(Math.toRadians(angle), width / 2, height / 2);
        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return rotated;
    }
}

使用该方法，可以将任意角度的图片旋转，并且不会损失图像内容。以下是一个示例代码：

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

public class Main {
    public static void main(String[] args) throws Exception {
        BufferedImage image = ImageIO.read(new File("image.jpg"));
        BufferedImage rotated = ImageRotation.rotate(image, 90);
        ImageIO.write(rotated, "jpg", new File("rotated.jpg"));
    }
}

该代码会将名为"image.jpg"的图片旋转90度，并将结果保存为"rotated.jpg"。