Java 图片加文字水印和图片水印

1：将字节数组转换为本地图片

 /**
         * 将字节数组转换为本地图片
         * @param data
         * @param path
         */
    public static void byte2image(byte[] data, String path) {
            if (data.length < 3 || path.equals("")){
                return;
            }
            try {
                FileImageOutputStream imageOutput = new FileImageOutputStream(new File(path));
                imageOutput.write(data, 0, data.length);
                imageOutput.close();
                System.out.println("生成图片成功：" + path);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
    }

2：给图片加图片水印

/**
 * 为背景图片增加水印图片
 *
 * @param path          水印图片，本地地址，未做网络图片转换
 * @param bgPath        背景图片，同上
 * @param x              横坐标,左上角0，往右递增
 * @param y              纵坐标,左上角0，往下递增
 * @param width          水印图片宽度
 * @param height         水印图片高度
 * @return
 */
public static byte[] generateImage(String path,String bgPath , int x, int y, int width, int height) {
    try {
        BufferedImage watermarkImage = ImageIO.read(new File(path));
        BufferedImage bgImage = ImageIO.read(new File(bgPath));
        int bgWidth = bgImage.getWidth(null);
        int bgHeight = bgImage.getHeight(null);
        BufferedImage image = new BufferedImage(bgWidth, bgHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = image.createGraphics();
        g.drawImage(bgImage, 0, 0, bgWidth, bgHeight, null);
        width = width == 0 ? watermarkImage.getWidth() : width;
        height = height == 0 ? watermarkImage.getHeight() : height;
        g.drawImage(watermarkImage, x, y, width, height, null);
        g.dispose();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", out);
        return out.toByteArray();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

测试

public static void main(String[] args) {
    String path = "D:/image/src/main/picture/1218395382.jpg";
    String waterPath = "D:/image/src/main/picture/sijiali_s1.jpg";
    String imgResult = "D:/image/src/mina/picture/水印.jpg";
    byte[] bytes = generateImage(waterPath,path, 250, 10,  80, 100);
    byte2image(bytes,imgResult);
}

效果：

原图

水印图片

结果图片

3：给图片加文字水印

/**
 * 添加文字水印的方法
 * @param pressText 要添加的文字
 * @param path 文件路径，这里只处理了了本地文件，未处理网络图片
 * @param x 文字在图片的横坐标，左上角为0，往右递增
 * @param y 文字在图片的纵坐标，左上角为0，往下递增
 * @param fontName 文字的字体名称
 * @param fontSize 文字的大小
 * @param fontColor 文字的眼神
 * @param style 文字的格式，如Font.BOLD++Font.ITALIC表示粗体斜体
 * @return
 */
private static byte[] generateText(String pressText, String path, int x, int y, String fontName,
                         int fontSize, Color fontColor, int style){
    try {
        BufferedImage bgImage= ImageIO.read(new File(path));
        int wideth = bgImage.getWidth(null);
        int height = bgImage.getHeight(null);
        BufferedImage image = new BufferedImage(wideth, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = image.createGraphics();
        g.drawImage(bgImage, 0, 0, wideth, height, null);

        //设置字体大小、颜色等
        g.setColor(fontColor);
        g.setFont(new Font(fontName, style, fontSize));

        g.drawString(pressText, x, y);
        g.dispose();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", out);
        return out.toByteArray();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

测试

public static void main(String[] args) {
    String path = "D:/image/src/main/picture/1218395382.jpg";
    String path2 = "D:/image/src/main/picture/文字水印.jpg";
    //Font.BOLD+Font.ITALIC表示加粗且斜体
    byte[] bytes = generateText("斯嘉丽", path, 210, 50, "微软雅黑", 30, Color.RED, Font.BOLD+Font.ITALIC);
    byte2image(bytes,path2);
}

结果：

原图