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);