图片添加二维码水印教程

本博客介绍一下用jdk awt实现图片加文字水印和图片水印的方法

一、图片文字水印

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;
import javax.swing.ImageIcon;


public class WaterMarkIMGUtils {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String srcImgPath = "C:/Users/zhaoh/Desktop/test.jpg";
        String targerPath1 = "C:/Users/zhaoh/Desktop/target1.jpg";
        WaterMarkIMGUtils.setWaterMarkForIMGByFontString(srcImgPath, targerPath1,
                Color.blue, "公司内部资料");
    }

    public static void setWaterMarkForIMGByFontString(String srcImgPath, String targerPath, Color markContentColor, String waterMarkContent){
    	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
            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);
           
            Font font = new Font("宋体", Font.PLAIN, 20);
            g.setColor(markContentColor); // 根据图片的背景设置水印颜色
            g.setFont(font);
            int srcImgWidth = srcImg.getWidth(null);
            int srcImgHeight = srcImg.getHeight(null);
            int waterMarkLength = g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
            int x = srcImgWidth - waterMarkLength - 3;
            int y = srcImgHeight - 3;
            g.drawString(waterMarkContent, x, y);
            
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
            g.dispose();

            os = new FileOutputStream(targerPath);
            // 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();
           }
       }
    }
}

原来图片

加上文字水印后图片

二、图片加图片水印

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;
public class WaterMarkIMGUtils {
/**
     * 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
     * @param imgType
     * 			上传附件的类型
     */
    public static void setWaterMarkForIMGByIcon(BufferedImage bufferedImage, InputStream in, OutputStream os, String imgType) {
    	setWaterMarkForIMG(iconPath, srcImgPath, targerPath, null, imgType);
    }

    /**
     * 给图片添加水印
     * @date   2019年6月12日下午2:11:11
     * @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
     * 			选择角度
     * @param imgType
     * 			上传附件的类型
     */
    public static void setWaterMarkForIMGByIcon(String iconPath, String srcImgPath, String targerPath, Integer degree,String imgType) {
        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
            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, imgType, os);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != os)
                    os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
 public static void main(String[] args) {
        String srcImgPath = "C:/Users/admin/Desktop/test.jpg";
        String iconPath = "C:/Users/admin/Desktop/logo.png";
        String targerPath1 = "C:/Users/admin/Desktop/target1.jpg";
        String targerPath2 = "C:/Users/admin/Desktop/target2.jpg";
        // 给图片添加水印
        WaterMarkIMGUtils.setWaterMarkForIMGByIcon(iconPath, srcImgPath, targerPath1,"JPG");
        // 给图片添加水印,水印旋转-10
        WaterMarkIMGUtils.setWaterMarkForIMGByIcon(iconPath, srcImgPath, targerPath2, -10,"JPG");

    }

}

原来图片：

水印图片：

添加水印后的图片：

【拓展功能】
上面代码参考网上教程，很多地方都有分享代码，然后下面对其进行拓展

业务场景，基于图片加图片水印的功能，现在要求上传图片时候就给加上二维码，用户可以扫描二维码获取对应数据

首先二维码里面其实也就是一些数据，比如一个链接，或者一堆文字等等，这里可以通过Google开源的zxing库来事项生成二维码图片，然后附加到图片，形成水印

maven配置zxing对应jar：

<!-- 条形码、二维码生成 -->
		<dependency>
			<groupId>com.google.zxing</groupId>
			<artifactId>core</artifactId>
			<version>2.2</version>
		</dependency>
		<dependency>
			<groupId>com.google.zxing</groupId>
			<artifactId>javase</artifactId>
			<version>2.2</version>
		</dependency>

写个工具类用于生成二维码图片：

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Hashtable;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * 二维码生成工具类
 */
public class QrCodeUtils {
	
	/**
	 * 生成二维码
	 * @author nicky.ma
	 * @date   2019年6月11日下午4:39:16
	 * @param contents 二维码的内容
     * @param width 二维码图片宽度
     * @param height 二维码图片高度
	 */
	public static BufferedImage createQrCodeBufferdImage(String contents, int width, int height){
		Hashtable hints= new Hashtable();   
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  
        BufferedImage image = null;
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(
                    contents,BarcodeFormat.QR_CODE, width, height, hints);
            image = toBufferedImage(bitMatrix);
        } catch (WriterException e) {
            e.printStackTrace();
        } 
        return image;
	}

	public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
          for (int y = 0; y < height; y++) {
            image.setRGB(x, y, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
          }
        }
        return image;
    }
}

写个图片添加图片水印的工具类，代码仅供参考
注意：二维码要清晰度要求比较高，就不要设置透明效果了

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;

import com.itextpdf.text.BadElementException;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfGState;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfStructTreeController.returnType;
import com.itextpdf.text.pdf.parser.PdfImageObject.ImageBytesType;
import com.stuff.stuffmanage.model.CommonStuffModel;
/**
 * 
 * <pre>
 *  水印处理工具类. <br>
 * </pre>
 *
 * @author nicky.ma
 * @date 2019/06/11
 */
public class WaterMarkUtils {
	

	/**
	 *  生成二维码
	 * @author nicky.ma
	 * @date   2019年6月12日下午2:15:51
	 * @param commonStuffModel
	 * @return
	 */
	private static BufferedImage createQrCodeImg(CommonStuffModel commonStuffModel){
		StringBuffer strBuf = new StringBuffer();
		strBuf.append("材料入库时间：").append(new SimpleDateFormat("yyyy-MM-dd").format(new Date())).append("
");
		strBuf.append("材料有效期：").append(commonStuffModel.getValidEndDateStr()).append("
");
		strBuf.append("材料名称：").append(commonStuffModel.getStuffName()).append("
");
		strBuf.append("材料目录：").append(commonStuffModel.getDirName()).append("
");
		strBuf.append("材料版本：").append(commonStuffModel.getVersion()).append("
");
		strBuf.append("出具单位：").append(commonStuffModel.getIssueUnit()).append("
");
		// 生成二维码
		BufferedImage bufferedImage = QrCodeUtils.createQrCodeBufferdImage(strBuf.toString(), 175, 175);
		return bufferedImage;
	}
	
	/**
	 * 图片附件添加二维码水印
	 * @author  nicky.ma
	 * @date   2019年6月12日下午2:13:29
	 * @param bos
	 * 			文件保存 IO stream
	 * @param input
	 * 			获取文件上传IO stream
	 * @param commonStuffModel
	 * 			公共材料库信息实体
	 * @param imgType
	 * 			附件类型
	 */
	public static void setQrCodeForIMG(BufferedOutputStream bos, InputStream input, 
			ApprCommonStuffModel apprCommonStuffModel, String imgType){
		BufferedImage bufferedImage = createQrCodeImg(apprCommonStuffModel);
		//图片附件加上二维码水印
		setWaterMarkForIMG(bufferedImage, input, bos, imgType);
	}
	
	/**
     * 给图片添加水印
     * @param bufferedImage
     * 			水印图片
     * @param in
     * 			获取附件上传stream
     * @param os
     * 			附件保存stream
     * @param imgType
     * 			上传附件的类型
     */
    public static void setWaterMarkForIMG(BufferedImage bufferedImage, InputStream in, OutputStream os, String imgType) {
    	setWaterMarkForIMG(bufferedImage, in, os, null, imgType);
    }

    /**
     * 给图片添加水印、可设置水印图片旋转角度
     * @author  nicky.ma
     * @date   2019年6月12日下午2:11:11
     * @param bufferedImage
     * 			水印图片
     * @param in
     * 			获取附件上传stream
     * @param os
     * 			附件保存stream
     * @param degree
     * 			选择角度
     * @param imgType
     * 			上传附件的类型
     */
    public static void setWaterMarkForIMG(BufferedImage bufferedImage, InputStream in, OutputStream os, Integer degree,String imgType) {
        //OutputStream os = null;
        long startTime = System.currentTimeMillis();
        System.out.println("图片附件添加图片水印 start");
        try {
            Image srcImg = ImageIO.read(in);
            BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null), srcImg.getHeight(null),
                    BufferedImage.TYPE_INT_RGB);
            // 得到画笔对象
            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);
            }
            //float alpha = 0.2f; // 透明度
            //g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
            
            // 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();
            // 表示水印图片的位置
            g.drawImage(bufferedImage, buffImg.getWidth()-180, 0, null);

            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
            g.dispose();

            //os = new FileOutputStream(targerPath);
            // 生成图片
            ImageIO.write(buffImg, imgType, os);

            long endTime = System.currentTimeMillis();
            System.out.println("图片附件添加图片水印 ok 所用时间:"+(endTime-startTime)+"s");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != os)
                    os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
 }

对于上传的文件，我们怎么知道类型？如果用Spring提供的MultipartFile，这里可以获取ContentType来判断，这里只提供思路

	/**文件类型集合*/
	private static Map<String,String> FILE_TYPES =new HashMap<String,String>();
	/**图片类型集合*/
	private static Map<String,String> IMG_TYPES = new HashMap<String,String>();

	static{
		FILE_TYPES.put("xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");//xlsx
		FILE_TYPES.put("xls", "application/vnd.ms-excel");//xls
		FILE_TYPES.put("docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document");//docx
		FILE_TYPES.put("doc", "application/msword");//doc
		FILE_TYPES.put("jpg", "image/jpeg");//jpg
		FILE_TYPES.put("png", "image/png");//png
		FILE_TYPES.put("gif", "image/gif");//gif
		FILE_TYPES.put("bmp", "image/bmp");//bmp
		FILE_TYPES.put("txt", "text/plain");//txt
		FILE_TYPES.put("pdf", "application/pdf");//pdf
		FILE_TYPES.put("zip", "application/x-zip-compressed");//zip
		FILE_TYPES.put("rar", "application/octet-stream");//rar
	}
	static{
		IMG_TYPES.put("jpg", "image/jpeg");//jpg
		IMG_TYPES.put("png", "image/png");//png
		IMG_TYPES.put("gif", "image/gif");//gif
		IMG_TYPES.put("bmp", "image/bmp");//bmp
	}

	/**
	 * 校验上传附件是否为图片类型的
	 * @author nicky.ma
	 * @date   2019年6月12日上午11:15:30
	 * @param fileContentType 
	 * 			response格式ContentType
	 */
	public static boolean checkContainImgType(String fileContentType){
		if(!StringUtils.isEmpty(fileContentType)){
			return IMG_TYPES.containsValue(fileContentType);
		}
		return false;
	}

	public static String loadFileType(String fileContentType){
		for(Map.Entry<String, String> entry : FILE_TYPES.entrySet()){
			if(entry.getValue().equals(fileContentType)){
				return entry.getKey();
			}
		}
		return null;
	}

有了工具类之后，我们需要获取文件上传的inputStream

public void upload(MultipartFile myfiles,String url,String rootPath,CommonStuffModel commonStuffModel)throws Exception{
	
        if(!myfiles.isEmpty()){   
            File localFile = new File(rootPath+url);  
            File parentFile = localFile.getParentFile();
            if(!parentFile.exists()){
            	parentFile.mkdirs();
			}
           
            String contentType = myfiles.getContentType();
           if(checkContainImgType(contentType)){//上传了图片类型附件
	            	InputStream inputStream = myfiles.getInputStream();
					BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(localFile));
	            	WaterMarkUtils.setQrCodeForIMG(bos, inputStream, 		commonStuffModel,CommonFileUtil.loadFileType(contentType));
	         }else{
	            	myfiles.transferTo(localFile);
	          }
		}
}

ok，生成二维码水印