给图片加水印

  1. import java.awt.Color;
  2. import java.awt.Font;
  3. import java.awt.Graphics2D;
  4. import java.awt.Image;
  5. import java.awt.image.BufferedImage;
  6. import java.io.File;
  7. import java.io.FileOutputStream;
  9. import javax.imageio.ImageIO;
  11. /**
  12. *
  13. * @use java给图片添加水印文字
  14. * @ProjectName stuff
  15. * @Author <a href="mailto:mhmyqn@qq.com">mumaoqiang</a></br>
  16. * @Date 2012-7-19 下午10:27:54 </br>
  17. * @FullName com.mmq.watermark.WaterMarkUtils.java </br>
  18. * @JDK 1.6.0 </br>
  19. * @Version 1.0 </br>
  20. */
  21. public class WaterMarkUtils {
  22.      /**
  23.      * 图片添加水印
  24.      * @param srcImgPath 需要添加水印的图片的路径
  25.      * @param outImgPath 添加水印后图片输出路径
  26.      * @param markContentColor 水印文字的颜色
  27.      * @param waterMarkContent 水印的文字
  28.      */
  29.      public void mark(String srcImgPath, String outImgPath, Color markContentColor, String waterMarkContent) {
  30.           try {
  31.             // 读取原图片信息
  32.             File srcImgFile = new File(srcImgPath);
  33.             Image srcImg = ImageIO.read(srcImgFile);
  34.             int srcImgWidth = srcImg.getWidth(null);
  35.             int srcImgHeight = srcImg.getHeight(null);
  36.             // 加水印
  37.             BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
  38.             Graphics2D g = bufImg.createGraphics();
  39.             g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
  40.             //Font font = new Font("Courier New", Font.PLAIN, 12);
  41.             Font font = new Font("宋体", Font.PLAIN, 50); 
  42.             g.setColor(markContentColor); //根据图片的背景设置水印颜色
  44.             g.setFont(font);
  45.             int x = srcImgWidth - getWatermarkLength(waterMarkContent, g) - 3;
  46.             int y = srcImgHeight - 3;
  47.             //int x = (srcImgWidth - getWatermarkLength(watermarkStr, g)) / 2;
  48.             //int y = srcImgHeight / 2;
  49.             g.drawString(waterMarkContent, x, y);
  50.             g.dispose();
  51.             // 输出图片
  52.             FileOutputStream outImgStream = new FileOutputStream(outImgPath);
  53.             ImageIO.write(bufImg, "jpg", outImgStream);
  54.             outImgStream.flush();
  55.             outImgStream.close();
  56.         } catch (Exception e) {
  57.             e.printStackTrace();
  58.         }
  59.      }
  61.      /**
  62.      * 获取水印文字总长度
  63.      * @param waterMarkContent 水印的文字
  64.      * @param g
  65.      * @return 水印文字总长度
  66.      */
  67.     public int getWatermarkLength(String waterMarkContent, Graphics2D g) {
  68.         return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
  69.     }
  71.     public static void main(String[] args) {
  72.          // 原图位置, 输出图片位置, 水印文字颜色, 水印文字
  73.         new WaterMarkUtils().mark("d:/postWatermark.jpg", "d:/afterWatermark.jpg", Color.red, "水印效果测试");
  74.    }
  75. }