java实现倾斜水印铺满整张图

package org.platform.framework.commons.util;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;import javax.swing.ImageIcon;import com.founder.cms.watermark.util.ImageMarkLogoUtil;/** *  * 生成水印 *  */public class ImageMarkUtil { /** 水印透明度 */ private static float alpha = 0.5f; /** 水印图片旋转角度 */ private static double degree = 0f; private static int interval = 0; /** * 设置水印参数，不设置就使用默认值 *  * @param alpha *   水印透明度 * @param degree *   水印图片旋转角度 * * @param interval *   水印图片间隔 */ public static void setImageMarkOptions(float alpha, int degree, int interval) { if (alpha != 0.0f) { ImageMarkUtil.alpha = alpha; } if (degree != 0f) { ImageMarkUtil.degree = degree; } if (interval != 0f) { ImageMarkUtil.interval = interval; } } /** * 给图片添加水印图片 *  * @param waterImgPath *   水印图片路径 * @param srcImgPath *   源图片路径 * @param targerPath *   目标图片路径 */ public static void waterMarkByImg(String waterImgPath, String srcImgPath, String targerPath) throws Exception { waterMarkByImg(waterImgPath, srcImgPath, targerPath, 0); } /** * 给图片添加水印图片 *  * @param waterImgPath *   水印图片路径 * @param srcImgPath *   源图片路径 * @param targerPath *   目标图片路径 */ public static void waterMarkByImg(String waterImgPath, String srcImgPath) { try { waterMarkByImg(waterImgPath, srcImgPath, srcImgPath, 0); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 给图片添加水印图片、可设置水印图片旋转角度 *  * @param waterImgPath *   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 waterMarkByImg(String waterImgPath, String srcImgPath, String targerPath, double degree) throws Exception { 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); // 1、得到画笔对象 Graphics2D g = buffImg.createGraphics(); // 2、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); // 3、设置水印旋转 if (0 != degree) { g.rotate(Math.toRadians(degree),  (double) buffImg.getWidth() / 2, (double) buffImg  .getHeight() / 2); } // 4、水印图片的路径 水印图片一般为gif或者png的，这样可设置透明度 ImageIcon imgIcon = new ImageIcon(waterImgPath); // 5、得到Image对象。 Image img = imgIcon.getImage(); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,  alpha)); // 6、水印图片的位置 for (int height = interval + imgIcon.getIconHeight(); height < buffImg  .getHeight(); height = height +interval+ imgIcon.getIconHeight()) { for (int weight = interval + imgIcon.getIconWidth(); weight < buffImg  .getWidth(); weight = weight +interval+ imgIcon.getIconWidth()) {  g.drawImage(img, weight - imgIcon.getIconWidth(), height  - imgIcon.getIconHeight(), null); } } g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); // 7、释放资源 g.dispose(); // 8、生成图片 os = new FileOutputStream(targerPath); ImageIO.write(buffImg, "JPG", os); System.out.println("图片完成添加水印图片"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (null != os)  os.close(); } catch (Exception e) { e.printStackTrace(); } } } public static void main(String[] args) { System.out.println("..添加水印图片开始..."); /** * watermarkPath 水印图片地址 uploadPath 上传成功后文件地址 */ //修改默认参数 //ImageMarkUtil.setImageMarkOptions(0.0f, 0, 20); //ImageMarkUtil.waterMarkByImg(watermarkPath, uploadPath); System.out.println("..添加水印图片结束..."); }}

 /** * watermarkPath 水印图片地址 * uploadPath 上传成功后文件地址 */ ImageMarkUtil.waterMarkByImg(watermarkPath, uploadPath);如果你觉得水印间隔太近了，可以通过下面代码设置间隔：//修改默认参数 ImageMarkUtil.setImageMarkOptions(0.0f, 0, 20); ImageMarkUtil.waterMarkByImg(watermarkPath, uploadPath);