java实现图片剪裁和加水印代码实现

很高兴回答你的问题！以下是Java实现图片剪裁和加水印的代码示例：

图片剪裁：

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

public class ImageCropExample {
  public static void main(String[] args) throws Exception {
    File input = new File("input.jpg");
    BufferedImage image = ImageIO.read(input);

    // 定义剪裁区域
    Rectangle rect = new Rectangle(10, 10, 100, 100);
    BufferedImage cropped = image.getSubimage(rect.x, rect.y, rect.width, rect.height);

    File output = new File("output.jpg");
    ImageIO.write(cropped, "jpg", output);
  }
}

图片加水印：

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

public class ImageWatermarkExample {
  public static void main(String[] args) throws Exception {
    File input = new File("input.jpg");
    BufferedImage image = ImageIO.read(input);

    // 创建Graphics2D对象
    Graphics2D g2d = image.createGraphics();

    // 设置水印文字字体、颜色和透明度
    g2d.setFont(new Font("Arial", Font.BOLD, 36));
    g2d.setColor(Color.RED);
    g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f));

    // 创建AffineTransform对象，设置水印文字旋转角度
    AffineTransform at = new AffineTransform();
    at.rotate(Math.toRadians(30), image.getWidth() / 2, image.getHeight() / 2);
    g2d.setTransform(at);

    // 绘制水印文字
    g2d.drawString("Watermark", image.getWidth() / 2, image.getHeight() / 2);

    // 释放Graphics2D对象
    g2d.dispose();

    File output = new File("output.jpg");
    ImageIO.write(image, "jpg", output);
  }
}

希望能帮到你，如果还有其他问题，请随时提出！