Java实现给图片加水印
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(); } } }}