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("\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");//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