本文為大家介紹了java圖片添加水印實例代碼，java實現水印還是非常方便的，水印可以是圖片或者文字，具體內容如下
package michael.io.image; import java.awt.AlphaComposite; import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageDecoder; import com.sun.image.codec.jpeg.JPEGImageEncoder; /** * 圖片水印* @blog http://sjsky.iteye.com * @author Michael */ public class ImageMarkLogoByIcon { /** * @param args */ public static void main(String[] args) { String srcImgPath = "d:/test/michael/myblog_01.png"; String iconPath = "d:/test/michael/blog_logo.png"; String targerPath = "d:/test/michael/img_mark_icon.jpg"; String targerPath2 = "d:/test/michael/img_mark_icon_rotate.jpg"; // 給圖片添加水印ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath); // 給圖片添加水印,水印旋轉-45 ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath2, -45); } /** * 給圖片添加水印* @param iconPath 水印圖片路徑* @param srcImgPath 源圖片路徑* @param targerPath 目標圖片路徑*/ public static void markImageByIcon(String iconPath, String srcImgPath, String targerPath) { markImageByIcon(iconPath, srcImgPath, targerPath, null); } /** * 給圖片添加水印、可設置水印圖片旋轉角度* @param iconPath 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 markImageByIcon(String iconPath, String srcImgPath, String targerPath, Integer degree) { 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); // 得到畫筆對象// Graphics g= buffImg.getGraphics(); Graphics2D g = buffImg.createGraphics(); // 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); if (null != degree) { // 設置水印旋轉g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg .getHeight() / 2); } // 水印圖像的路徑水印一般為gif或者png的，這樣可設置透明度ImageIcon imgIcon = new ImageIcon(iconPath); // 得到Image對象。 Image img = imgIcon.getImage(); float alpha = 0.5f; // 透明度g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 表示水印圖片的位置g.drawImage(img, 150, 300, null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); g.dispose(); os = new FileOutputStream(targerPath); // 生成圖片ImageIO.write(buffImg, "JPG", os); System.out.println("圖片完成添加Icon印章。。。。。。"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (null != os) os.close(); } catch (Exception e) { e.printStackTrace(); } } } }再為大家分享一例：
import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Image;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import javax.imageio.ImageIO;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder; public final class ImageUtils { public ImageUtils() { } /** * public final static String getPressImgPath() { return ApplicationContext * .getRealPath("/template/data/util/shuiyin.gif"); } */ /** * 把圖片印刷到圖片上* * @param pressImg -- * 水印文件* @param targetImg -- * 目標文件* @param x * --x坐標* @param y * --y坐標*/ public final static void pressImage(String pressImg, String targetImg, int x, int y) { try { //目標文件File _file = new File(targetImg); Image src = ImageIO.read(_file); int wideth = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(wideth, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.createGraphics(); g.drawImage(src, 0, 0, wideth, height, null); //水印文件File _filebiao = new File(pressImg); Image src_biao = ImageIO.read(_filebiao); int wideth_biao = src_biao.getWidth(null); int height_biao = src_biao.getHeight(null); g.drawImage(src_biao, (wideth - wideth_biao) / 2, (height - height_biao) / 2, wideth_biao, height_biao, null); //水印文件結束g.dispose(); FileOutputStream out = new FileOutputStream(targetImg); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(image); out.close(); } catch (Exception e) { e.printStackTrace(); } } /** * 打印文字水印圖片* * @param pressText * --文字* @param targetImg -- * 目標圖片* @param fontName -- * 字體名* @param fontStyle -- * 字體樣式* @param color -- * 字體顏色* @param fontSize -- * 字體大小* @param x -- * 偏移量* @param y */ public static void pressText(String pressText, String targetImg, String fontName, int fontStyle, int color, int fontSize, int x, int y) { try { File _file = new File(targetImg); Image src = ImageIO.read(_file); int wideth = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(wideth, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.createGraphics(); g.drawImage(src, 0, 0, wideth, height, null); g.setColor(Color.RED); g.setFont(new Font(fontName, fontStyle, fontSize)); g.drawString(pressText, wideth - fontSize - x, height - fontSize / 2 - y); g.dispose(); FileOutputStream out = new FileOutputStream(targetImg); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(image); out.close(); } catch (Exception e) { System.out.println(e); } } public static void main(String[] args) { pressImage("F:/logo.png", "F:/123.jpg", 0, 0); }}希望本文所述對大家用java語言實現圖片添加水印有所幫助。