Java图片加水印

分为文字水印和透明图片水印

package com.qms.report.util;

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

public class ImageWatermark {
    /**
     * @param waterMarkType 1时代表水印是文本，2代表水印是透明图片
     */
    private void imageWatermark(int waterMarkType) {
        // 原始图片路径
        String imagePath = "/Users/jaki/Desktop/BSQ/QMS/QMS/qms-qc-report/src/main/java/com/qms/report/util/images.jpg";
        // 书印文字
        String watermarkText = "Your Watermark";
        // 书印透明图片地址
        String watermarkImagePath = "path_to_watermark_image.png";
        // 输出路径
        String outputImagePath = "/Users/jaki/Desktop/BSQ/QMS/QMS/qms-qc-report/src/main/java/com/qms/report/util/imagesRemark.jpg";

        try {
            // 原始图片
            BufferedImage originalImage = ImageIO.read(new File(imagePath));
            // 副本（水印）图片
            BufferedImage watermarkedImage = new BufferedImage(originalImage.getWidth(), originalImage.getHeight(), BufferedImage.TYPE_INT_RGB);
            // 获取图形
            Graphics2D graphics = (Graphics2D) watermarkedImage.getGraphics();
            // 绘制图片
            graphics.drawImage(originalImage, 0, 0, null);
            graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f));

            if (waterMarkType == 1) {
                // 1时代表水印是文本
                // 字体
                Font font = new Font("Arial", Font.BOLD, 36);
                graphics.setFont(font);
                graphics.setColor(Color.RED);
                // 获取指定字体的规格
                FontMetrics fontMetrics = graphics.getFontMetrics(font);
                int textwidth = fontMetrics.stringWidth(watermarkText);
                int textheight = fontMetrics.getHeight();
                int x = (originalImage.getWidth() - textwidth);
                int y = (originalImage.getHeight() - textheight);
                // 绘制水印
                graphics.drawString(watermarkText, x, y);
            } else {
                // 读取水印图片
                BufferedImage watermarkImage = ImageIO.read(new File(watermarkImagePath));
                int x = (originalImage.getWidth() - watermarkImage.getWidth());
                int y = (originalImage.getHeight() - watermarkImage.getHeight());
                graphics.drawImage(watermarkImage, x, y, null);
            }
            ImageIO.write(watermarkedImage, "jpg", new File(outputImagePath));
            graphics.dispose();
            System.out.println("添加水印结束！");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) {
    }
}