java图片添加水印实例代码分享

本文为大家介绍了java图片添加水印实例代码，java实现水印还是非常方便的，水印可以是图片或者文字，具体内容如下

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; 

/**
 * 图片水印
 * @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";
  // 给图片添加水印
  ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath);
  // 给图片添加水印,水印旋转-45
  ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath2,
    -45); 

 } 

 /**
  * 给图片添加水印
  * @param iconPath 水印图片路径
  * @param srcImgPath 源图片路径
  * @param targerPath 目标图片路径
  */
 public static void markImageByIcon(String iconPath, String srcImgPath,
   String targerPath) {
  markImageByIcon(iconPath, srcImgPath, targerPath, null);
 } 

 /**
  * 给图片添加水印、可设置水印图片旋转角度
  * @param iconPath 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 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); 

   // 得到画笔对象
   // Graphics g= buffImg.getGraphics();
   Graphics2D g = buffImg.createGraphics(); 

   // 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); 

   if (null != degree) {
    // 设置水印旋转
    g.rotate(Math.toRadians(degree),
      (double) buffImg.getWidth() / 2, (double) buffImg
        .getHeight() / 2);
   } 

   // 水印图象的路径 水印一般为gif或者png的，这样可设置透明度
   ImageIcon imgIcon = new ImageIcon(iconPath); 

   // 得到Image对象。
   Image img = imgIcon.getImage(); 

   float alpha = 0.5f; // 透明度
   g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
     alpha)); 

   // 表示水印图片的位置
   g.drawImage(img, 150, 300, null); 

   g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); 

   g.dispose(); 

   os = new FileOutputStream(targerPath); 

   // 生成图片
   ImageIO.write(buffImg, "JPG", os); 

   System.out.println("图片完成添加Icon印章。。。。。。");
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   try {
    if (null != os)
     os.close();
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
 }
} 

再为大家分享一例：

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"); }
  */

 /**
  * 把图片印刷到图片上
  *
  * @param pressImg --
  *   水印文件
  * @param targetImg --
  *   目标文件
  * @param x
  *   --x坐标
  * @param y
  *   --y坐标
  */
 public final static void pressImage(String pressImg, String targetImg,
   int x, int y) {
  try {
   //目标文件
   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);
   //水印文件结束
   g.dispose();
   FileOutputStream out = new FileOutputStream(targetImg);
   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
   encoder.encode(image);
   out.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 /**
  * 打印文字水印图片
  *
  * @param pressText
  *   --文字
  * @param targetImg --
  *   目标图片
  * @param fontName --
  *   字体名
  * @param fontStyle --
  *   字体样式
  * @param color --
  *   字体颜色
  * @param fontSize --
  *   字体大小
  * @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);
 }
}

希望本文所述对大家用java语言实现图片添加水印有所帮助。