pdf文档动态插入文字水印，45度角，旋转倾斜，位于文档中央，多行水印可插入中文

一行水印

/*** @param inputFile 你的PDF文件地址* @param outputFile 添加水印后生成PDF存放的地址* @param waterMarkName 你的水印* @return*/public static boolean waterMark(String inputFile,String outputFile, String waterMarkName){try {PdfReader reader = new PdfReader(inputFile);PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outputFile));//这里的字体设置比较关键，这个设置是支持中文的写法BaseFont base = BaseFont.createFont("STSong-Light","UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);// 使用系统字体int total = reader.getNumberOfPages() + 1;PdfContentByte under;Rectangle pageRect = null;for (int i = 1; i < total; i++) {pageRect = stamper.getReader().getPageSizeWithRotation(i);// 计算水印X,Y坐标float x = pageRect.getWidth()/2;float y = pageRect.getHeight()/2;// 获得PDF最顶层under = stamper.getOverContent(i);under.saveState();// set TransparencyPdfGState gs = new PdfGState();// 设置透明度为0.2gs.setFillOpacity(0.2f);under.setGState(gs);under.beginText();under.setFontAndSize(base, 40);under.setColorFill(BaseColor.GRAY);// 水印文字成45度角倾斜under.showTextAligned(Element.ALIGN_CENTER , waterMarkName, x,y, 55);// 添加水印文字under.endText();under.setLineWidth(1f);under.stroke();under.restoreState();}stamper.close();return true;} catch (Exception e) {e.printStackTrace();return false;}}

两行多行水印可以这样

import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfGState;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
/*** app检测报告加水印** @author: liuhy* @param inputStream 输入流* @param outputStream 输出流* @param waterMarkName1 水印文字1* @param waterMarkName2 水印文字2* @return*/public static boolean apptReportWaterMark(InputStream inputStream,OutputStream outputStream, String waterMarkName1,String waterMarkName2){try {PdfReader reader = new PdfReader(inputStream);PdfStamper stamper = new PdfStamper(reader, outputStream);BaseFont base = BaseFont.createFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.EMBEDDED);//这里的字体设置比较关键，这个设置是支持中文的写法
//            BaseFont base = BaseFont.createFont("STSong-Light","UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);// 使用系统字体int total = reader.getNumberOfPages() + 1;PdfContentByte under;Rectangle pageRect = null;for (int i = 1; i < total; i++) {pageRect = stamper.getReader().getPageSizeWithRotation(i);// 计算水印X,Y坐标float x = pageRect.getWidth()/2;float y = pageRect.getHeight()/2;// 获得PDF最顶层under = stamper.getOverContent(i);under.saveState();// set TransparencyPdfGState gs = new PdfGState();// 设置透明度为0.2gs.setFillOpacity(0.2f);under.setGState(gs);//****第一行水印开始under.beginText();under.setFontAndSize(base, 60);under.setColorFill(BaseColor.GRAY);// 水印文字成45度角倾斜under.showTextAligned(Element.ALIGN_CENTER , waterMarkName1, x,y+50, 20);// 添加水印文字under.endText();//****第一行水印结束//****第二行水印开始under.beginText();under.setFontAndSize(base, 36);under.setColorFill(BaseColor.GRAY);// 水印文字成45度角倾斜under.showTextAligned(Element.ALIGN_CENTER , waterMarkName2, x,y, 20);// 添加水印文字under.endText();//****第二行水印结束under.setLineWidth(1f);under.stroke();under.restoreState();}stamper.close();return true;} catch (Exception e) {e.printStackTrace();return false;}}

 maven

<dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.12</version></dependency><dependency><groupId>com.itextpdf.tool</groupId><artifactId>xmlworker</artifactId><version>5.5.12</version></dependency><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version>
</dependency>