旋转图像的Java程序

问题陈述是将图像顺时针旋转 90 度，在这里我们将使用 BufferedImage 类和 Color c 的一些内置方法

执行操作所需的类如下：

• 读取和写入 图像文件我们必须导入 File 类。此类通常表示文件和目录路径名。
• 为了处理错误，我们使用 IOException 类。
• 为了保存图像，我们使用 BufferedImage 类创建了 BufferedImage 对象。该对象用于在 RAM 中存储图像。
• 为了执行图像读写操作，我们将导入 ImageIO 类。此类具有读取和写入图像的静态方法。
• 此 Graphics2D 类扩展了 Graphics 类，以提供对几何、坐标转换、颜色管理和文本布局的更复杂的控制。这是在Java(tm) 平台上呈现二维形状、文本和图像的基本类。

例子：

Java

// Java program to rotate image by 90 degrees clockwise
 
// Importing classes from java.awt package for
// painting graphics and images
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
// Importing input output classes
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
 
// Main class
public class GFG {
 
    // Method 1
    // To return rotated image
    public static BufferedImage rotate(BufferedImage img)
    {
 
        // Getting Dimensions of image
        int width = img.getWidth();
        int height = img.getHeight();
 
        // Creating a new buffered image
        BufferedImage newImage = new BufferedImage(
            img.getWidth(), img.getHeight(), img.getType());
 
        // creating Graphics in buffered image
        Graphics2D g2 = newImage.createGraphics();
 
        // Rotating image by degrees using toradians()
        // method
        // and setting new dimension t it
        g2.rotate(Math.toRadians(90), width / 2,
                  height / 2);
        g2.drawImage(img, null, 0, 0);
 
        // Return rotated buffer image
        return newImage;
    }
 
    // Method 2
    // Main driver method
    public static void main(String[] args)
    {
        // try block to check for exceptions
        try {
 
            // Reading orignal image
            BufferedImage orignalImg = ImageIO.read(
                new File("D:/test/Image.jpeg"));
 
            // Getting and Printing dimensions of orignal
            // image
            System.out.println("Orignal Image Dimension: "
                               + orignalImg.getWidth() + "x"
                               + orignalImg.getHeight());
 
            // Creating a subimage of given dimensions
            BufferedImage SubImg = rotate(orignalImg);
 
            // Printing Dimensions of new image created
            // (Rotated image)
            System.out.println("Cropped Image Dimension: "
                               + SubImg.getWidth() + "x"
                               + SubImg.getHeight());
 
            // Creating new file for rotated image
            File outputfile
                = new File("D:/test/ImageRotated.jpeg");
 
            // Writing image in new file created
            ImageIO.write(SubImg, "jpg", outputfile);
 
            // Printing executed message
            System.out.println(
                "Image rotated successfully: "
                + outputfile.getPath());
        }
 
        // Catch block to handle the exception
        catch (IOException e) {
 
            // Print the line number where exception
            // occurred
            e.printStackTrace();
        }
    }
}

输出：执行程序后，控制台将显示尺寸和执行消息，并在输入的路径上创建一个新的旋转图像，如下所示：