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。