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 * @pa<div style="color:transparent">来源gaodai.ma#com搞##代!^码网</div>ram 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 +interval+ imgicon.geticonheight()) { for (int weight + imgicon.geticonwidth(); </div><p><strong>第三步：在实现上传成功的地方，调用该类，如：<br /></strong></p><div class="gaodaimacode"><pre class="prettyprint linenums"> /** * 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);