Java图片添加水印

朱雀 2022-05-21 02:10 446阅读 0赞

## 更新点 ##

## [考拉博客][Link 1] ##

*  文章发布增加首页背景图片
 *  图片增加文本水印,根据图片大小自动设置水印字体大小

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## Java增加水印代码 ##

/** * Created by march on 2018/6/27. * 图片工具类 */
    
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.FileOutputStream;
    import javax.imageio.ImageIO;
    import java.awt.Color;
    import com.sun.image.codec.jpeg.JPEGCodec;
    import com.sun.image.codec.jpeg.JPEGImageEncoder;
    
    public class ImageUtils { 
        public static int MIN_FONT_SIZE = 15; //最小字体大小
        public static int REDUCE_SCALE = 20;  //文字虽小比例，根据图片大小进行动态设置字体大小
        public static String MARK_TEXT = "http://kooola.com";
        public static String FONT_NAME = "华为楷体";
        public static int FONT_STYLE = 5;
        private static Color TEXT_COLOR = Color.GRAY;
    
    
        /** * // * @param text 文本 * @param img 目标图标path // * @param fontName 字体名称 // * @param fontStyle 字体样式 */
        public static void makeWatermark(String img){
            int fontSize = 40;
    
    
            File file = new File(img);
            Image src = null;
            try{
                src = ImageIO.read(file);
            }catch (Exception e){
                e.printStackTrace();
            }
            int width = src.getWidth(null);
            int height = src.getHeight(null);
    
            int size = width > height ? height : width;
            //根据图片大小动态设置字体大小
            fontSize = size / REDUCE_SCALE < MIN_FONT_SIZE ? MIN_FONT_SIZE : size / REDUCE_SCALE;
    
    
            // x,y 为文字开始的相对位置
    // int x = width - fontSize * text.length();
            int x = 0;  //x 设置到左下角开头
            int y = height - fontSize;
    
    
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics graphics = image.createGraphics();
            graphics.drawImage(src, 0, 0, width, height, null);
            graphics.setFont(new Font(FONT_NAME, FONT_STYLE, fontSize));
            graphics.setColor(TEXT_COLOR);
            graphics.drawString(MARK_TEXT, x, y);
    
            graphics.dispose();
            FileOutputStream fileOutputStream = null;
            try{
                fileOutputStream = new FileOutputStream(img);
            }catch (Exception e){
                e.printStackTrace();
            }
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fileOutputStream);
            try{
                encoder.encode(image);
            }catch (Exception e){
                e.printStackTrace();
            }
            try {
                fileOutputStream.close();
            }catch (Exception e){
                e.printStackTrace();
            }
        }
        public static void main(String[] args){
            makeWatermark("/Users/march/Downloads/t9gg6570quh5koe6fqkdil2sqm.jpg");
        }
    }

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## 效果 ##

![Java图片水印][Java]

[Link 1]: http://kooola.com
[Java]: /images/20220521/2a7b7857356541b2a0da5a09ec05f686.png