Java实现 图片水印或者文字水印详解编程语言

在原图之上再画一张图片(drawImage)或者文本文字(drawString)，Java SE中提供了 java.awt.image包和javax.imageio包可以实现非常方便的实现 图片水印或者文字水印。

1.图片水印

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.FileOutputStream;   
import java.io.OutputStream;   
import javax.imageio.ImageIO;   
import javax.swing.ImageIcon;   
   
/**  
 * 生成图片水印  
 * @author Ricky Fung  
 *  
 */   
public class WaterMarkIconTest {   
   
    /**  
     * @param args  
     */   
    public static void main(String[] args) {   
           
        File srcImageFile = new File("D:/test/myblog.png");   
        File logoImageFile = new File("D:/test/logo.png");   
           
        File outputImageFile = new File("D:/test/myblog_water_icon.jpg");   
        File outputRoateImageFile = new File("D:/test/myblog_water_icon_rotate.jpg");   
           
        createWaterMarkByIcon(srcImageFile, logoImageFile, outputImageFile);   
           
        createWaterMarkByIcon(srcImageFile, logoImageFile, outputRoateImageFile, 45);   
    }   
   
    public static void createWaterMarkByIcon(File srcImageFile, File logoImageFile,   
            File outputImageFile) {   
        createWaterMarkByIcon(srcImageFile, logoImageFile, outputImageFile, 0);   
    }   
   
    public static void createWaterMarkByIcon(File srcImageFile, File logoImageFile,   
            File outputImageFile, double degree) {   
           
        OutputStream os = null;   
        try {   
            Image srcImg = ImageIO.read(srcImageFile);   
   
            BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),   
                    srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);   
   
            Graphics2D g = buffImg.createGraphics();   
   
            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);   
   
            ImageIcon logoImgIcon = new ImageIcon(ImageIO.read(logoImageFile));   
   
            Image logoImg = logoImgIcon.getImage();   
   
            //旋转   
            if (degree>0) {   
                g.rotate(Math.toRadians(degree),   
                        (double) buffImg.getWidth() / 2,   
                        (double) buffImg.getWidth() / 2);   
            }   
               
            float alpha = 0.8f; // 透明度   
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,   
                    alpha));   
   
            //水印 的位置   
            g.drawImage(logoImg, buffImg.getWidth()/3, buffImg.getHeight()/2, null);   
   
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));   
   
            g.dispose();   
   
            os = new FileOutputStream(outputImageFile);   
   
            // 生成图片   
            ImageIO.write(buffImg, "JPG", os);   
   
        } catch (Exception e) {   
            e.printStackTrace();   
        } finally {   
            try {   
                if (null != os)   
                    os.close();   
            } catch (Exception e) {   
                e.printStackTrace();   
            }   
        }   
    }   
   
}  

2.文字水印

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.OutputStream;   
import javax.imageio.ImageIO;   
   
/**  
 * 生成文字水印  
 * @author Ricky Fung  
 *  
 */   
public class WaterMarkTextTest {   
   
    /**  
     * @param args  
     */   
    public static void main(String[] args) {   
           
        File srcImgFile = new File("D:/test/myblog.png");   
        String logoText = "[ 水印文字 电话邦   ]";   
           
        File outputImageFile = new File("D:/test/myblog_water_text.jpg");   
           
        File outputRotateImageFile = new File("D:/test/myblog_water_text_rotate.jpg");   
   
        createWaterMarkByText(srcImgFile, logoText, outputImageFile);   
   
        createWaterMarkByText(srcImgFile, logoText, outputRotateImageFile, 45);   
    }   
   
       
    public static void createWaterMarkByText(File srcImgFile, String logoText,   
            File outputImageFile) {   
        createWaterMarkByText(srcImgFile, logoText, outputImageFile, 0);   
    }   
       
    public static void createWaterMarkByText(File srcImgFile, String logoText,   
            File outputImageFile, double degree) {   
           
        OutputStream os = null;   
        try {   
            Image srcImg = ImageIO.read(srcImgFile);   
   
            BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),   
                    srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);   
   
            Graphics2D g = buffImg.createGraphics();   
   
            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 (degree>0) {   
                g.rotate(Math.toRadians(degree),   
                        (double) buffImg.getWidth() / 2,   
                        (double) buffImg.getHeight() / 2);   
            }   
   
            g.setColor(Color.RED);   
   
            g.setFont(new Font("宋体", Font.BOLD, 36));   
   
            float alpha = 0.8f;   
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,   
                    alpha));   
   
            g.drawString(logoText, buffImg.getWidth()/3, buffImg.getHeight()/2);   
   
            g.dispose();   
   
            os = new FileOutputStream(outputImageFile);   
   
            // 生成图片   
            ImageIO.write(buffImg, "JPG", os);   
   
        } catch (Exception e) {   
            e.printStackTrace();   
        } finally {   
            try {   
                if (null != os)   
                    os.close();   
            } catch (Exception e) {   
                e.printStackTrace();   
            }   
        }   
    }   
   
}