Java为图片加水印的代码详解编程语言

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..."); 
} 
}