JAVA在图片上设置水印图片（源码+注释详解）

淩亂°似流年 2023-10-01 16:06 3阅读 0赞

package suiyin;
    
    import javax.imageio.ImageIO;
    import javax.swing.*;
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    /**
     * @author yeqv
     * @program A2
     * @Classname Timg
     * @Date 2022/1/22 15:51
     * @Email w16638771062@163.com
     */
    public class Timg {
        
        public static void main(String[] args) {
        
            //源图片路径
            String st1 = "C:\\Users\\w1663\\Pictures\\Camera Roll\\img.png";
            //水印图片路径
            String st2 = "C:\\Users\\w1663\\Pictures\\Camera Roll\\sy.png";
            //目标图片路径
            String st3 = "C:\\Users\\w1663\\Pictures\\Camera Roll\\img4.png";
            //水印图片旋转度
            Integer xz = 90;
            timg(st1, st2, st3, xz);
    
        }
    
        public static void timg(String st1, String st2, String st3, Integer xz) {
        
            try {
        
                //读取源图片信息
                var m = ImageIO.read(new File(st1));
                //创建画布
                BufferedImage img = new BufferedImage(m.getWidth(), m.getHeight(), BufferedImage.TYPE_INT_ARGB);
                //创建画笔
                var g = img.createGraphics();
                //将源图片信息画入画布
                g.drawImage(m, 0, 0, m.getWidth(), m.getHeight(), null);
                //设置对线段的锯齿状边缘处理
                g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
                //新建图标对象读取水印图片
                ImageIcon imageIcon = new ImageIcon(st2);
                //获取图标的图片
                Image image = imageIcon.getImage();
                //设置图标的透明度
                g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.5f));
                //设置图标位置
                int x = img.getWidth() - image.getWidth(null) - 10;
                int y = img.getHeight() - 10;
                //判断旋转角度是否为空进行旋转
                if (xz != null) {
        
                    g.rotate(Math.toDegrees(xz), img.getWidth() - image.getWidth(null) / 2 - 10, img.getHeight() - image.getHeight(null) / 2 - 10);
                }
                //将图标画入画布中
                g.drawImage(image, x, y - image.getHeight(null), null);
                //将图标和源图片结合
                g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
                //清空画笔
                g.dispose();
                //建立写入流目标图片对象
                FileOutputStream out = new FileOutputStream(st3);
                //将画布信息传入文件中
                ImageIO.write(img, "png", out);
    
    
            } catch (IOException e) {
        
                e.printStackTrace();
            }
    
        }
    }