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..."); 
    } 
 
}