Java为图片加水印的代码

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;
/***

Description: 图片水印工具类 
Copyright: Copyright (c) 2011 
Company: Founder 
Project: CMS

@Author taoxg
@version 1.0
@See 
HISTORY 2011-9-27 taoxg create
**/
public class ImageMarkLogoUtil {
// 水印透明度 
 private static float alpha = 0.5f;
 // 水印横向位置
 private static int positionWidth = 150;
 // 水印纵向位置
 private static int positionHeight = 300;
 // 水印文字字体
 private static Font font = new Font("宋体", Font.BOLD, 30);
 // 水印文字颜色
 private static Color color = Color.red;
 /**


@param alpha 
水印透明度
@param positionWidth 
水印横向位置
@param positionHeight 
水印纵向位置
@param font 
水印文字字体
@param color 
水印文字颜色
*/
public static void setImageMarkOptions(float alpha , int positionWidth , int positionHeight ,Font font,Color color){
if(alpha!=0.0f)ImageMarkLogoUtil.alpha = alpha;
if(positionWidth!=0)ImageMarkLogoUtil.positionWidth = positionWidth;
if(positionHeight!=0)ImageMarkLogoUtil.positionHeight = positionHeight;
if(font!=null)ImageMarkLogoUtil.font = font;
if(color!=null)ImageMarkLogoUtil.color = color;
}
/**

给图片添加水印图片

@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);
}
/**

给图片添加水印图片、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);
// 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 (null != 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(iconPath);
// 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
g.drawImage(img, positionWidth, positionHeight, 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();
}
}
}
/**

给图片添加水印文字

@param logoText 
水印文字
@param srcImgPath
源图片路径
@param targerPath
目标图片路径
*/
public static void markImageByText(String logoText, String srcImgPath,
String targerPath) {
markImageByText(logoText, srcImgPath, targerPath, null);
}
/**

给图片添加水印文字、可设置水印文字的旋转角度

@param logoText
@param srcImgPath
@param targerPath
@param degree
*/
public static void markImageByText(String logoText, String srcImgPath,

 String targerPath, Integer degree) {


InputStream is = null;
 OutputStream os = null;
 try {

 // 1、源图片
 Image srcImg = ImageIO.read(new File(srcImgPath));
 BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);

 // 2、得到画笔对象
 Graphics2D g = buffImg.createGraphics();
 // 3、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);
 // 4、设置水印旋转
 if (null != degree) {
     g.rotate(Math.toRadians(degree),(double) buffImg.getWidth() / 2, (double) buffImg.getHeight() / 2);
 }
 // 5、设置水印文字颜色
 g.setColor(color);
 // 6、设置水印文字Font
 g.setFont(font);
 // 7、设置水印文字透明度
 g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,alpha));
 // 8、第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y)
 g.drawString(logoText, positionWidth, positionHeight);
 // 9、释放资源
 g.dispose();
 // 10、生成图片
 os = new FileOutputStream(targerPath);
 ImageIO.write(buffImg, "JPG", os);

 System.out.println("图片完成添加水印文字");


} catch (Exception e) {

 e.printStackTrace();

} finally {

 try {
     if (null != is)
         is.close();
 } catch (Exception e) {
     e.printStackTrace();
 }
 try {
     if (null != os)
         os.close();
 } catch (Exception e) {
     e.printStackTrace();
 }

}
}
public static void main(String [] args){
 String srcImgPath = "d:/qie.jpg";

 String logoText = "[ I love Qie]";
 String iconPath = "d:/shuimu.jpg";
String targerTextPath = "d:/qie_text.jpg";

 String targerTextPath2 = "d:/qie_text_rotate.jpg";
String targerIconPath = "d:/qie_icon.jpg";

 String targerIconPath2 = "d:/qie_icon_rotate.jpg";
System.out.println("给图片添加水印文字开始...");
 // 给图片添加水印文字

 markImageByText(logoText, srcImgPath, targerTextPath);

 // 给图片添加水印文字,水印文字旋转-45

 markImageByText(logoText, srcImgPath, targerTextPath2, -45);

 System.out.println("给图片添加水印文字结束...");
System.out.println("给图片添加水印图片开始...");
 setImageMarkOptions(0.3f,1,1,null,null);
 // 给图片添加水印图片

 markImageByIcon(iconPath, srcImgPath, targerIconPath);

 // 给图片添加水印图片,水印图片旋转-45

 markImageByIcon(iconPath, srcImgPath, targerIconPath2, -45); 
 System.out.println("给图片添加水印图片结束...");
}




}
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