springBoot 给图片添加文字水印

项目要求给每个考生制作证书。这里我们有每个公司需要的背景图片模板，而我现在要做的就是把每个考生的考试信息和个人信息，以水印的形式添加到图片的指定位置。（现在这个灵活性不高）下面就直接上代码。

首先我这边先写了一个工具类waterMarkUtils 。在这个工具类里面主要设置每个水印的位置以及字体还有存放位置。(我这边因为要上传到服务器，所以就稍微处理了一下，还有我这个可以添加多个水印,图片的来源是网络路径)代码如下：

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.math.BigDecimal;
import java.net.HttpURLConnection;
import java.net.URL;public class WaterMarkUtils {/*** @param srcImgPath 源图片路径* @param tarImgPath 保存的图片路径* @param waterMarkContent 水印内容* @param markContentColor 水印颜色* @param font 水印字体* @param workerNames*/public static Object addWaterMark(String srcImgPath, String tarImgPath, String waterMarkContent, String workerNames,String workerCardNums, String allStaffOrgNames, BigDecimal studentScores, String certNums, String trainCredentialNames,String templateContents, Color markContentColor, Font font) {try {//new一个url对象URL url = new URL(srcImgPath);//打开链接HttpURLConnection  conn = (HttpURLConnection)url.openConnection();//设置请求方式/*conn.setRequestMethod("GET");*///超时相应时间为5秒conn.setConnectTimeout(5*1000);//通过输入流获取图片数据InputStream inputStream = null;try {inputStream = conn.getInputStream();}catch (Exception e){e.printStackTrace();}//文件转化为图片Image srcImg = null;try {srcImg = ImageIO.read(inputStream);}catch (Exception e){e.printStackTrace();}//获取图片的宽int srcImgWidth = srcImg.getWidth(null);//获取图片的高int srcImgHeight = srcImg.getHeight(null);// 加水印BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);Graphics2D g = bufImg.createGraphics();g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);//根据图片的背景设置水印颜色g.setColor(markContentColor);//设置字体g.setFont(font);//设置时间水印的坐标int x = (int) (srcImgWidth - 1.64*getWatermarkLength(waterMarkContent, g));int y = (int) (srcImgHeight - 1.15*getWatermarkLength(waterMarkContent, g));int x2 = 0;int y2 = 0;//设置姓名水印坐标if (workerNames.length() == 3){x2 = (int) (srcImgWidth - 7.4*getWatermarkLength(workerNames,g));y2 = (int) (srcImgHeight - 7.27*getWatermarkLength(workerNames,g));}else if (workerNames.length() == 2){x2 = (int) (srcImgWidth - 11*getWatermarkLength(workerNames,g));y2 = (int) (srcImgHeight - 10.9*getWatermarkLength(workerNames,g));}else if (workerNames.length() == 4){x2 = (int) (srcImgWidth - 5.9*getWatermarkLength(workerNames,g));y2 = (int) (srcImgHeight - 5.45*getWatermarkLength(workerNames,g));}int x3 =0;int y3 =0;if (workerCardNums.length() == 18){//设置身份证号水印坐标x3 = (int) (srcImgWidth - 1.6*getWatermarkLength(workerCardNums,g));y3 = (int) (srcImgHeight - 0.4*getWatermarkLength(workerCardNums,g));}else if (workerCardNums.length() == 17){x3 = (int) (srcImgWidth - 1.7*getWatermarkLength(workerCardNums,g));y3 = (int) (srcImgHeight - 0.42*getWatermarkLength(workerCardNums,g));}else if (workerCardNums.length() == 16){x3 = (int) (srcImgWidth - 1.8*getWatermarkLength(workerCardNums,g));y3 = (int) (srcImgHeight - 0.45*getWatermarkLength(workerCardNums,g));}//设置组织名称水印坐标int x4 = srcImgWidth - 2*getWatermarkLength(allStaffOrgNames,g);int y4 = srcImgHeight - 3*getWatermarkLength(allStaffOrgNames,g);int x5 = 0;int y5 = 0;if (studentScores.longValue() >= 100){//设置分数水印坐标x5 = (int) (srcImgWidth - 11.8*getWatermarkLength(String.valueOf(studentScores),g));y5 = (int) (srcImgHeight - 9.7*getWatermarkLength(String.valueOf(studentScores),g));}else if (studentScores.longValue() <10 && studentScores.longValue()>= 0){//设置分数水印坐标x5 = (int) (srcImgWidth - 35*getWatermarkLength(String.valueOf(studentScores),g));y5 = (int) (srcImgHeight - 28.99*getWatermarkLength(String.valueOf(studentScores),g));}else if (studentScores.longValue() <= 99 && studentScores.longValue()> 10){//设置分数水印坐标x5 = (int) (srcImgWidth - 17.4*getWatermarkLength(String.valueOf(studentScores),g));y5 = (int) (srcImgHeight - 14.5*getWatermarkLength(String.valueOf(studentScores),g));}//设置证书编号水印坐标int x6 = 0;int y6 = 0;if (certNums.length() == 15){x6 = (int) (srcImgWidth - 2.09*getWatermarkLength(certNums,g));y6 = (int) (srcImgHeight - 4.14*getWatermarkLength(certNums,g));}//设置证书名称水印坐标int x7 = srcImgWidth - 3*getWatermarkLength(trainCredentialNames,g);int y7 = srcImgHeight - 2*getWatermarkLength(trainCredentialNames,g);//设置模板内容水印坐标int x8 = srcImgWidth - 1*getWatermarkLength(templateContents,g);int y8 = srcImgHeight - 1*getWatermarkLength(templateContents,g);//画出水印g.drawString(waterMarkContent,x,y);g.drawString(workerNames,x2,y2);g.drawString(workerCardNums,x3,y3);/* g.drawString(allStaffOrgNames,x4,y4);*/g.drawString(String.valueOf(studentScores),x5,y5);g.drawString(certNums,x6,y6);/*g.drawString(trainCredentialNames,x7,y7);g.drawString(templateContents,x8,y8);*/g.dispose();// 输出图片
//            FileOutputStream outImgStream = new FileOutputStream(tarImgPath);
//            ImageIO.write(bufImg, "jpeg", outImgStream);System.out.println("添加水印完成");return bufImg;} catch (Exception e) {// TODO: handle exception}return null;}private byte[] readInputStream(InputStream inputStream) throws IOException {ByteArrayOutputStream outStream = new ByteArrayOutputStream();//创建一个Buffer字符串byte[] buffer = new byte[1024];//每次读取的字符串长度，如果为-1，代表全部读取完毕int len = 0;//使用一个输入流从buffer里把数据读取出来while( (len=inputStream.read(buffer)) != -1 ){//用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度outStream.write(buffer, 0, len);}//关闭输入流inputStream.close();//把outStream里的数据写入内存return outStream.toByteArray();}public static int getWatermarkLength(String waterMarkContent, Graphics2D g) {return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());}
}

然后就是自己写查询的代码了，我这里是直接在serviceImpl 实现类里面调用的这个工具类代码如下：

service层接口:

serviceImpl实现类:

 /*** 获取证书需要的字段* @return*/@Overridepublic Map<String,Object> getAllStaffTrainWorker(JSONObject jsonParam) {String allStaffWorkerId = jsonParam.getString("allStaffWorkerIds");if (null == allStaffWorkerId){errLog("getAllStaffTrainWorker", ErrorCodeMsg.PARAM_ERROR.getMessage(), "员工id不存在");throw new AttemptException(ErrorCodeMsg.PARAM_ERROR,"员工id不存在");}//员工表查询出员工的基本信息Example example = new Example(AllStaffTrainWorker.class);Example.Criteria criteria = example.createCriteria();criteria.andEqualTo("isDeleted", CmnConstants.IS_DELETED_NO);criteria.andEqualTo("isEnabled", CmnConstants.IS_ENABLED_YES);String [] allStaffWorkerArry = allStaffWorkerId.split(",");List<Long> allStaffWorkerIds = new ArrayList<>();for (String allStaffWorkerIdss :allStaffWorkerArry){allStaffWorkerIds.add(Long.valueOf(allStaffWorkerIdss));}criteria.andIn("allStaffWorkerId",allStaffWorkerIds);List<AllStaffTrainWorker> allStaffTrainWorkerList = this.allStaffTrainWorkerMapper.selectByExample(example);//姓名String workerName = null;//身份证号String workerCardNum = null;//组织名称String allStaffOrgName = null;//学员得分BigDecimal studentScore = null;//证书编号String certNum = null;//证书名称String trainCredentialName = null;//获取模板内容String templateContent = null;//获取背景图片路径String imgUrl =null;if (null != allStaffTrainWorkerList){for (AllStaffTrainWorker allStaffTrainWorker1 : allStaffTrainWorkerList){workerName= allStaffTrainWorker1.getWorkerName();workerCardNum = allStaffTrainWorker1.getWorkerCardNum();allStaffOrgName = allStaffTrainWorker1.getAllStaffOrgName();}//考试表获取分数Example example1 = new Example(AllStaffTrainWorkerExam.class);Example.Criteria criteria1 = example1.createCriteria();criteria1.andEqualTo("isDeleted", CmnConstants.IS_DELETED_NO);criteria1.andEqualTo("isEnabled", CmnConstants.IS_ENABLED_YES);criteria1.andEqualTo("allStaffWorkerId",allStaffWorkerId);List<AllStaffTrainWorkerExam> allStaffTrainWorkerExamList = this.allStaffTrainWorkerExamMapper.selectByExample(example1);for (AllStaffTrainWorkerExam allStaffTrainWorkerExam : allStaffTrainWorkerExamList){studentScore =  allStaffTrainWorkerExam.getStudentScore();}//证书表得到证书编号Example example2 = new Example(AllStaffTrainWorkerCert.class);Example.Criteria criteria2 = example2.createCriteria();criteria2.andEqualTo("isDeleted", CmnConstants.IS_DELETED_NO);criteria2.andEqualTo("isEnabled", CmnConstants.IS_ENABLED_YES);criteria2.andEqualTo("allStaffWorkerId",allStaffWorkerId);List<AllStaffTrainWorkerCert> allStaffTrainWorkerCertList = this.allStaffTrainWorkerCertMapper.selectByExample(example2);Long allStaffTrainCertId = null;for (AllStaffTrainWorkerCert allStaffTrainWorkerCert : allStaffTrainWorkerCertList){certNum =  allStaffTrainWorkerCert.getCertNum();allStaffTrainCertId = allStaffTrainWorkerCert.getAllStaffTrainCertId();}//配置证书表获取证书名称Example example3= new Example(AllStaffTrainCert.class);Example.Criteria criteria3 = example3.createCriteria();criteria3.andEqualTo("isDeleted", CmnConstants.IS_DELETED_NO);criteria3.andEqualTo("isEnabled", CmnConstants.IS_ENABLED_YES);criteria3.andEqualTo("allStaffTrainCertId",allStaffTrainCertId);List<AllStaffTrainCert> allStaffTrainCertList = this.allStaffTrainCertMapper.selectByExample(example3);//模板idLong allStaffTrainTemplateId = null;//图片idLong allStaffTrainImgId = null;for (AllStaffTrainCert allStaffTrainCert : allStaffTrainCertList){trainCredentialName = allStaffTrainCert.getTrainCredentialName();allStaffTrainTemplateId = allStaffTrainCert.getAllStaffTrainTemplateId();allStaffTrainImgId = allStaffTrainCert.getAllStaffTrainImgId();}Example example4 = new Example(AllStaffTrainCertTemplate.class);Example.Criteria criteria4 = example4.createCriteria();criteria4.andEqualTo("isDeleted", CmnConstants.IS_DELETED_NO);criteria4.andEqualTo("isEnabled", CmnConstants.IS_ENABLED_YES);criteria4.andEqualTo("allStaffTrainTemplateId",allStaffTrainTemplateId);AllStaffTrainCertTemplate allStaffTrainCertTemplate = this.allStaffTrainCertTemplateMapper.selectOneByExample(example4);//获取模板内容templateContent = allStaffTrainCertTemplate.getTemplateContent();Example example5 = new Example(AllStaffTrainCertImg.class);Example.Criteria criteria5 = example5.createCriteria();criteria5.andEqualTo("isDeleted", CmnConstants.IS_DELETED_NO);criteria5.andEqualTo("isEnabled", CmnConstants.IS_ENABLED_YES);criteria5.andEqualTo("allStaffTrainImgId",allStaffTrainImgId);AllStaffTrainCertImg allStaffTrainCertImg = this.allStaffTrainCertImgMapper.selectOneByExample(example5);//获取背景图片路径imgUrl = allStaffTrainCertImg.getImgUrl();}ClassPathResource classPathResource = new ClassPathResource("fonts/msyh.ttc");InputStream inputStream = null;try {inputStream = classPathResource.getInputStream();}catch (Exception e){e.getMessage();}Font dynamicFont = null;try {dynamicFont = Font.createFont(Font.TRUETYPE_FONT, inputStream);}catch (Exception e){e.printStackTrace();}Font font = dynamicFont.deriveFont(Font.PLAIN, 28); //水印字体 方法3//水印字体/*Font font = new Font("微软雅黑", Font.PLAIN, 28);*///源图片地址String srcImgPath="http://"+imgUrl;//待存储的地址String tarImgPath = "F:/证书.jpeg";//格式化时间SimpleDateFormat f=new SimpleDateFormat("yyyy     MM     dd");String format = f.format(new Date());//时间String waterMarkContent=format;//姓名String workerNames = workerName;//身份证号String workerCardNums = workerCardNum;//组织名称String allStaffOrgNames = allStaffOrgName;//学员得分BigDecimal studentScores = studentScore;//证书编号String certNums =certNum;//证书名称String trainCredentialNames = trainCredentialName;//获取模板内容String templateContents = templateContent;//水印图片色彩以及透明度Color color=new Color(79 ,79 ,79);BufferedImage bufferedImage = (BufferedImage) WaterMarkUtils.addWaterMark(srcImgPath, tarImgPath, waterMarkContent, workerNames, workerCardNums, allStaffOrgNames, studentScores, certNums, trainCredentialNames, templateContents, color, font);String sessionToke =jsonParam.getString("sessionToke");String attname = "证书"+".jpeg";String url = null;try {byte[] jpegs = imageToBytes(bufferedImage, "jpeg");url = FastDFSUtils.getDoUpload(sessionToke,attname,jpegs);}catch (Exception e){errLog("getDownloadAllStaffWorkers",ErrorCodeMsg.UNKNOWN_ERROR.getMessage(),e.getMessage());throw new AttemptException(ErrorCodeMsg.UNKNOWN_ERROR,e.getMessage());}Map<String, Object> resultMap = getFastDFSFileInfoMap(url,attname);return resultMap;}public  byte[] imageToBytes(BufferedImage bImage, String format) {ByteArrayOutputStream out = new ByteArrayOutputStream();try {ImageIO.write(bImage, format, out);} catch (IOException e) {e.printStackTrace();}return out.toByteArray();}/*** 返回给前端下载地址** @param url* @param attname* @return*/private Map<String, Object> getFastDFSFileInfoMap(String url, String attname) {String filePath = null;if (StringUtils.isNotEmpty(url)) {JSONObject jsonObject = JSONObject.parseObject(url);String data = jsonObject.getString("data");JSONObject dataObject = JSONObject.parseObject(data);filePath = dataObject.getString("filePath");if (StringUtils.isEmpty(filePath)) {errLog("getFastDFSFileInfoMap", ErrorCodeMsg.UNKNOWN_ERROR.getMessage(), "获取文件服务下载地址为空");throw new AttemptException(ErrorCodeMsg.UNKNOWN_ERROR, "获取文件服务下载地址为空");}}Map<String, Object> map = new HashMap<>(32);map.put("url",fileServer+"/"+filePath);map.put("attname", attname);return map;}

controller层代码

/*** 证书需要的内容* @return*/@PostMapping("/getAllStaffTrainWorker")public ResponseStruct getAllStaffTrainWorker(@RequestBody JSONObject jsonParam){return ResponseStruct.success(this.allStaffTrainWorkerCertInterface.getAllStaffTrainWorker(jsonParam));}

总结：
这里面的坑:
1.图片是我们这边上传到服务器的所以数据库存放的的 url 而且输入到浏览器可以直接下载的。所以读取文件url的时候，我进行了了处理具体代码就在工具类最上面
2.每个水印因为文字的字体和大小变动，位置也会变动
3.刚一开始文字字体用的Windows自带的字体，上传到服务器之后，因为服务器没有字体。要么下载一个要么想我这样把字体包放到项目根目录然后再用流方式获取。
4.字体包位置

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