Zxing系列之图片添加二维码水印教程

继之前博客PDF添加二维码水印教程：https://smilenicky.blog.csdn.net/article/details/91655064，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-10WaterMarkIMGUtils.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("\n");strBuf.append("材料有效期：").append(commonStuffModel.getValidEndDateStr()).append("\n");strBuf.append("材料名称：").append(commonStuffModel.getStuffName()).append("\n");strBuf.append("材料目录：").append(commonStuffModel.getDirName()).append("\n");strBuf.append("材料版本：").append(commonStuffModel.getVersion()).append("\n");strBuf.append("出具单位：").append(commonStuffModel.getIssueUnit()).append("\n");// 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");//xlsxFILE_TYPES.put("xls", "application/vnd.ms-excel");//xlsFILE_TYPES.put("docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document");//docxFILE_TYPES.put("doc", "application/msword");//docFILE_TYPES.put("jpg", "image/jpeg");//jpgFILE_TYPES.put("png", "image/png");//pngFILE_TYPES.put("gif", "image/gif");//gifFILE_TYPES.put("bmp", "image/bmp");//bmpFILE_TYPES.put("txt", "text/plain");//txtFILE_TYPES.put("pdf", "application/pdf");//pdfFILE_TYPES.put("zip", "application/x-zip-compressed");//zipFILE_TYPES.put("rar", "application/octet-stream");//rar}static{IMG_TYPES.put("jpg", "image/jpeg");//jpgIMG_TYPES.put("png", "image/png");//pngIMG_TYPES.put("gif", "image/gif");//gifIMG_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

程序缺陷：生成的二维码图片背景不是透明的，要实现透明的，可以参考博客：https://smilenicky.blog.csdn.net/article/details/94064286