Java代码实现给图片添加水印

public static void main(String[] args) throws IOException {
    long start = System.currentTimeMillis();
    // 输入图片路径
    String inputFile = "C:/Users/admin/Desktop/2023.jpg";
    // 输出图片路径
    String outputFile = "C:/Users/admin/Desktop/水印/2023_Graphics2D_ " + i + ".jpg";
    // 水印文本内容,中文转Unicode
    String watermarkText = "添加水印";
    shuiyin2.markWithContent(inputFile, FONT, Color.darkGray, watermarkText, outputFile);
    long end = System.currentTimeMillis();
    System.out.println("水印添加时间：" + (end -start) + "毫秒");
}



// 水印字体
private static final Font FONT = new Font("微软雅黑", Font.PLAIN, 24);

// 透明度
private static final AlphaComposite COMPOSITE = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.6f);

// 水印之间的间隔
private static final int X_MOVE = 150;

// 水印之间的间隔
private static final int Y_MOVE = 200;

public static void markWithContent(String inputImgPath, Font font, Color markContentColor,
                                   String waterMarkContent,
                                   String outImgPath) throws IOException {

    // 读取原图片信息
    File srcFile = new File(inputImgPath);
    File outFile = new File(outImgPath);
    BufferedImage srcImg = ImageIO.read(srcFile);

    // 图片宽、高
    int imgWidth = srcImg.getWidth();
    int imgHeight = srcImg.getHeight();

    // 图片缓存
    BufferedImage bufImg = new BufferedImage(imgWidth, imgHeight, BufferedImage.TYPE_INT_RGB);

    // 创建绘图工具
    Graphics2D graphics = bufImg.createGraphics();

    // 画入原始图像
    graphics.drawImage(srcImg, 0, 0, imgWidth, imgHeight, null);

    // 设置水印颜色
    graphics.setColor(markContentColor);

    // 设置水印透明度
    graphics.setComposite(COMPOSITE);

    // 设置倾斜角度
    graphics.rotate(Math.toRadians(-35), (double) bufImg.getWidth() / 2,
            (double) bufImg.getHeight() / 2);

    // 设置水印字体
    graphics.setFont(font);

    // 消除java.awt.Font字体的锯齿
    graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    int xCoordinate = -imgWidth / 2, yCoordinate;
    // 字体长度
    int markWidth = FONT.getSize() * getTextLength(waterMarkContent);
    // 字体高度
    int markHeight = FONT.getSize();

    // 循环添加水印
    while (xCoordinate < imgWidth * 1.5) {
        yCoordinate = -imgHeight / 2;
        while (yCoordinate < imgHeight * 1.5) {
            graphics.drawString(waterMarkContent, xCoordinate, yCoordinate);
            yCoordinate += markHeight + Y_MOVE;
        }
        xCoordinate += markWidth + X_MOVE;
    }

    // 释放画图工具
    graphics.dispose();

    try (FileOutputStream fos = new FileOutputStream(outFile)) {
        // 输出图片
        ImageIO.write(bufImg, "jpg", fos);
        fos.flush();
    }
}


/**
 * 计算水印文本长度
 * 中文长度即文本长度
 * 英文长度为文本长度二分之一
 */
public static int getTextLength(String text) {
    //水印文字长度
    int length = text.length();

    for (int i = 0; i < text.length(); i++) {
        String s = String.valueOf(text.charAt(i));
        if (s.getBytes().length > 1) {
            length++;
        }
    }
    length = length % 2 == 0 ? length / 2 : length / 2 + 1;
    return length;
}