今天遇到一個需求對上傳的圖鋪滿水印,在網上找了半天都是在指定位置設置水印,下面代碼是我通過在網上找的代碼,然後改造而成的。我們先看一下效果圖
下面講實現方法:
第一步:使用ps或美圖軟件設計水印圖片,比如:
第二步:把下面代碼放入類中:
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; /** 水印圖片旋轉角度*/ private static double degree = 0f; private static int interval = 0; /** * 設置水印參數,不設置就使用默認值* * @param alpha * 水印透明度* @param degree * 水印圖片旋轉角度* * @param interval * 水印圖片間隔*/ 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; } } /** * 給圖片添加水印圖片* * @param waterImgPath * 水印圖片路徑* @param srcImgPath * 源圖片路徑* @param targerPath * 目標圖片路徑*/ public static void waterMarkByImg(String waterImgPath, String srcImgPath, String targerPath) throws Exception { waterMarkByImg(waterImgPath, srcImgPath, targerPath, 0); } /** * 給圖片添加水印圖片* * @param waterImgPath * 水印圖片路徑* @param srcImgPath * 源圖片路徑* @param targerPath * 目標圖片路徑*/ public static void waterMarkByImg(String waterImgPath, String srcImgPath) { try { waterMarkByImg(waterImgPath, srcImgPath, srcImgPath, 0); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 給圖片添加水印圖片、可設置水印圖片旋轉角度* * @param waterImgPath * 水印圖片路徑* @param srcImgPath * 源圖片路徑* @param targerPath * 目標圖片路徑* @param degree * 水印圖片旋轉角度*/ 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、得到畫筆對象Graphics2D g = buffImg.createGraphics(); // 2、設置對線段的鋸齒狀邊緣處理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、設置水印旋轉if (0 != degree) { g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg .getHeight() / 2); } // 4、水印圖片的路徑水印圖片一般為gif或者png的,這樣可設置透明度ImageIcon imgIcon = new ImageIcon(waterImgPath); // 5、得到Image對象。 Image img = imgIcon.getImage(); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 6、水印圖片的位置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、釋放資源g.dispose(); // 8、生成圖片os = new FileOutputStream(targerPath); ImageIO.write(buffImg, "JPG", os); System.out.println("圖片完成添加水印圖片"); } 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("..添加水印圖片開始..."); /** * watermarkPath 水印圖片地址uploadPath 上傳成功後文件地址*/ //修改默認參數//ImageMarkUtil.setImageMarkOptions(0.0f, 0, 20); //ImageMarkUtil.waterMarkByImg(watermarkPath, uploadPath); System.out.println("..添加水印圖片結束..."); }}第三步:在實現上傳成功的地方,調用該類,如:
/** * watermarkPath 水印圖片地址* uploadPath 上傳成功後文件地址*/ ImageMarkUtil.waterMarkByImg(watermarkPath, uploadPath);如果你覺得水印間隔太近了,可以通過下面代碼設置間隔://修改默認參數ImageMarkUtil.setImageMarkOptions(0.0f, 0, 20); ImageMarkUtil.waterMarkByImg(watermarkPath, uploadPath);
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持武林網。