转载：java实现给图片加水印
周末在家上围脖，看到sina围脖上图片都有水印，想到Java有专门Image的处理包，同样应该可以实现水印功能，查了资料小试下来发现java实现水印还是非常方便的，水印可以是图片或者文字，而且还可以选择不同的角度旋转呢，以后有需要可以写个代码批量处理自己的图片了。本门目录：
图片水印
文字水印
[一]、图片水印
package michael.io.image; import java.awt.AlphaComposite; import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageDecoder; import com.sun.image.codec.jpeg.JPEGImageEncoder; /** * 图片水印 * @blog http://sjsky.iteye.com * @author Michael */ public class ImageMarkLogoByIcon { /** * @param args */ public static void main(String[] args) { String srcImgPath = "d:/test/michael/myblog_01.png"; String iconPath = "d:/test/michael/blog_logo.png"; String targerPath = "d:/test/michael/img_mark_icon.jpg"; String targerPath2 = "d:/test/michael/img_mark_icon_rotate.jpg"; // 给图片添加水印 ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath); // 给图片添加水印,水印旋转-45 ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath2, -45); } /** * 给图片添加水印 * @param iconPath 水印图片路径 * @param srcImgPath 源图片路径 * @param targerPath 目标图片路径 */ public static void markImageByIcon(String iconPath, String srcImgPath, String targerPath) { markImageByIcon(iconPath, srcImgPath, targerPath, null); } /** * 给图片添加水印、可设置水印图片旋转角度 * @param iconPath 水印图片路径 * @param srcImgPath 源图片路径 * @param targerPath 目标图片路径 * @param degree 水印图片旋转角度 */ public static void markImageByIcon(String iconPath, String srcImgPath, String targerPath, Integer degree) { OutputStream os = null; try { Image srcImg = ImageIO.read(new File(srcImgPath)); BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null), srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB); // 得到画笔对象 // Graphics g= buffImg.getGraphics(); Graphics2D g = buffImg.createGraphics(); // 设置对线段的锯齿状边缘处理 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null), srcImg .getHeight(null), Image.SCALE_SMOOTH), 0, 0, null); if (null != degree) { // 设置水印旋转 g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg .getHeight() / 2); } // 水印图象的路径 水印一般为gif或者png的，这样可设置透明度 ImageIcon imgIcon = new ImageIcon(iconPath); // 得到Image对象。 Image img = imgIcon.getImage(); float alpha = 0.5f; // 透明度 g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 表示水印图片的位置 g.drawImage(img, 150, 300, null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); g.dispose(); os = new FileOutputStream(targerPath); // 生成图片 ImageIO.write(buffImg, "JPG", os); System.out.println("图片完成添加Icon印章。。。。。。"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (null != os) os.close(); } catch (Exception e) { e.printStackTrace(); } } } }
原始图片myblog_01.jpg:
http://dl.iteye.com/upload/attachment/540325/83a1d25d-f6fc-3811-a0ad-1ac9db1d3f4b.jpg
水印图片blog_logo.png：
http://dl.iteye.com/upload/attachment/540327/9ad25442-c564-3ac9-bbc2-af385cd017d4.png
添加水印后的效果图：
http://dl.iteye.com/upload/attachment/540329/812c74ce-8464-37a3-9abb-97cb59d9b63b.jpg
水印图标旋转的效果图：
http://dl.iteye.com/upload/attachment/540331/c9cd8419-85a1-3d36-b543-75a596873aab.jpg
[二]、文字水印
package michael.io.image; import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import javax.imageio.ImageIO; /** * 文字水印 * @blog http://sjsky.iteye.com * @author Michael */ public class ImageMarkLogoByText { /** * @param args */ public static void main(String[] args) { String srcImgPath = "d:/test/michael/myblog_01.jpg"; String logoText = "[ 测试文字水印 http://sjsky.iteye.com ]"; String targerPath = "d:/test/michael/img_mark_text.jpg"; String targerPath2 = "d:/test/michael/img_mark_text_rotate.jpg"; // 给图片添加水印 ImageMarkLogoByText.markByText(logoText, srcImgPath, targerPath); // 给图片添加水印,水印旋转-45 ImageMarkLogoByText.markByText(logoText, srcImgPath, targerPath2, -45); } /** * 给图片添加水印 * @param logoText * @param srcImgPath * @param targerPath */ public static void markByText(String logoText, String srcImgPath, String targerPath) { markByText(logoText, srcImgPath, targerPath, null); } /** * 给图片添加水印、可设置水印的旋转角度 * @param logoText * @param srcImgPath * @param targerPath * @param degree */ public static void markByText(String logoText, String srcImgPath, String targerPath, Integer degree) { // 主图片的路径 InputStream is = null; OutputStream os = null; try { Image srcImg = ImageIO.read(new File(srcImgPath)); BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null), srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB); // 得到画笔对象 // Graphics g= buffImg.getGraphics(); Graphics2D g = buffImg.createGraphics(); // 设置对线段的锯齿状边缘处理 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null), srcImg .getHeight(null), Image.SCALE_SMOOTH), 0, 0, null); if (null != degree) { // 设置水印旋转 g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg .getHeight() / 2); } // 设置颜色 g.setColor(Color.red); // 设置 Font g.setFont(new Font("宋体", Font.BOLD, 30)); float alpha = 0.5f; g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y) . g.drawString(logoText, 150, 300); g.dispose(); os = new FileOutputStream(targerPath); // 生成图片 ImageIO.write(buffImg, "JPG", os); System.out.println("图片完成添加文字印章。。。。。。"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (null != is) is.close(); } catch (Exception e) { e.printStackTrace(); } try { if (null != os) os.close(); } catch (Exception e) { e.printStackTrace(); } } } }
添加文字水印后的效果图如下：
http://dl.iteye.com/upload/attachment/540335/771e9a38-56bc-3bfb-bf59-a26c1e6e86ce.jpg
文字旋转后的效果图如下：
http://dl.iteye.com/upload/attachment/540333/26c55ac2-1ecf-36a6-bd98-51c484ef1638.jpg
原文出处：http://sjsky.iteye.com/blog/1154390
页:
[1]