? ? ? ? 在word生成pdf后，或者上傳pdf文件，用戶希望給pdf文檔添加水印信息，具體代碼如下

? 一. 首先pom中需要引入

<!-- PDF水印-->
 <dependency>
     <groupId>com.itextpdf</groupId>
     <artifactId>itextpdf</artifactId>
       <version>5.5.13</version>
 </dependency>
 <!-- 中文字體 -->
 <dependency>
     <groupId>com.itextpdf</groupId>
     <artifactId>itext-asian</artifactId>
     <version>5.2.0</version>
 </dependency>

核心代碼如下，寫在某個(gè) service 下面

public void signPdf(InputStream is, Supplier<OutputStream> os, List<WaterMarkInfoRequest> signList) {
       PdfStamper stamper = null;
       PdfReader reader = null;
       try {
           reader = new PdfReader(is);
           stamper = new PdfStamper(reader, os.get());
           for (WaterMarkInfoRequest s : signList) {
               TextWaterMarkRequest textWaterMark = s.getTextWaterMark();
               if (textWaterMark != null) {
                   //添加文字
                   BaseFont baseFont;
                   try {
                       baseFont = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
                   } catch (DocumentException | IOException e) {
                       log.info("pdf簽名獲取字體信息異常:{}", e.getMessage(), e);
                       throw new BusinessException(IO_ERROR.toErrorInfos("pdf簽名獲取字體信息異常"));
                   }
                   PdfContentByte content = stamper.getOverContent(textWaterMark.getPageNo());
                   PdfGState gState = new PdfGState();
                   //設(shè)置透明度
                   gState.setFillOpacity(textWaterMark.getAlpha());
                   content.setGState(gState);
                   content.beginText();
                   //設(shè)置字體
                   content.setFontAndSize(baseFont, textWaterMark.getFontSize());
                   //設(shè)置顏色
                   content.setColorFill(new BaseColor(0xFF << 24 | Integer.parseInt(textWaterMark.getFontColor(), 16)));

                   //設(shè)置水印內(nèi)容和位置
                   content.showTextAligned(Element.ALIGN_MIDDLE, textWaterMark.getText(), textWaterMark.getIntervalVertical(), textWaterMark.getIntervalHorizontal(), 0f);
                   content.endText();
               }
               ImageWaterMarkRequest imageWaterMark = s.getImageWaterMark();
               if (imageWaterMark != null) {
                   //添加圖片
                   PdfContentByte content = stamper.getOverContent(imageWaterMark.getPageNo());
                   PdfGState gState = new PdfGState();
                   //設(shè)置透明度
                   gState.setFillOpacity(imageWaterMark.getAlpha());
                   //image
                   Image image = Image.getInstance(EncryptUtil.base64DecoderToBytes(imageWaterMark.getBase64Str()));
                   image.setAbsolutePosition(imageWaterMark.getPositionX(), imageWaterMark.getPositionY());
                   if (imageWaterMark.getScaleAbsoluteX() != null && imageWaterMark.getScaleAbsoluteY() != null) {
                       image.scaleToFit(imageWaterMark.getScaleAbsoluteX(), imageWaterMark.getScaleAbsoluteY());
                   } else if (imageWaterMark.getScalePercent() != null && imageWaterMark.getScalePercent() > 0) {
                       image.scalePercent(imageWaterMark.getScalePercent());
                   }
                   content.addImage(image);
                   content.stroke();
               }

           }

       } catch (Exception e) {
           e.printStackTrace();
           log.info("添加簽名失?。簕}", e.getLocalizedMessage(), e);
           WM_WRITE_ERR.throwException();
       } finally {
           if (null != stamper) {
               try {
                   stamper.close();
               } catch (Exception e) {
                   log.info("關(guān)閉失?。簕}", e.getMessage(), e);
               }
           }
           if (null != reader) {
               reader.close();
           }
       }

   }

用到的實(shí)體類

public class ImageWaterMarkRequest{

    @ApiModelProperty(value = "需要添加的頁碼，默認(rèn)所有頁碼都添加")
    private Integer pageNo;
    @ApiModelProperty(value = "水平位置  左下角坐標(biāo)(0,0)")
    private Integer positionX;
    @ApiModelProperty(value = "垂直位置  左下角坐標(biāo)(0,0)")
    private Integer positionY;
    @ApiModelProperty(value = "指定圖像寬度  ")
    private Integer scaleAbsoluteX;
    @ApiModelProperty(value = "指定圖像高度 ")
    private Integer scaleAbsoluteY;
    @ApiModelProperty(value = "縮放比例 與指定尺寸沖突 優(yōu)先使用指定圖像尺寸")
    private Integer scalePercent;
    @ApiModelProperty(value = "圖片的二進(jìn)制數(shù)據(jù)")
    @NotNull
    private String base64Str;
    @ApiModelProperty(value = "透明度  0--1")
    private Float alpha;

    @ApiModelProperty(value = "透明度  0--1",hidden = true)
    private Float opacity;
    @ApiModelProperty(value = "是否水印打在最頂層  默認(rèn)true")
    private Boolean isTop;
}

public class WaterMarkInfoRequest {
    @ApiModelProperty(value = "文字水印信息")
    private TextWaterMarkRequest textWaterMark;
    @ApiModelProperty(value = "圖片水印信息")
    private ImageWaterMarkRequest imageWaterMark;
}

?方法測(cè)試文章來源地址http://www.zghlxwxcb.cn/news/detail-699786.html

import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;


public class PdfWaterMarkServiceImplTest {

    public static void main(String[] args) throws Exception {
        InputStream is = Files.newInputStream(Paths.get("/Users/cong/Downloads/a.pdf"));
        OutputStream outputStream = Files.newOutputStream(Paths.get("/Users/cong/Downloads/q-5.pdf"));
        ArrayList<WaterMarkInfoRequest> requests = new ArrayList<>();


        WaterMarkInfoRequest waterMarkInfo = addSign(1);
        WaterMarkInfoRequest waterMarkInfo2 = addSign(1);


        requests.add(waterMarkInfo);
        requests.add(waterMarkInfo2);
        //調(diào)用你自己服務(wù)的pdf水印方法
        new PdfWaterMarkServiceImpl().signPdf(is, () -> outputStream, requests);
        outputStream.close();
    }

    private static WaterMarkInfoRequest addSign(Integer pageNum) {
        WaterMarkInfoRequest waterMarkInfo = new WaterMarkInfoRequest();

        ImageWaterMarkRequest imageWaterMark = new ImageWaterMarkRequest();
        imageWaterMark.setPageNo(pageNum);
        imageWaterMark.setPositionY(200);
        imageWaterMark.setPositionX(200);
        imageWaterMark.setTop(true);
        imageWaterMark.setAlpha(1.0f);
        imageWaterMark.setBase64Str("圖片base64");

        waterMarkInfo.setImageWaterMark(imageWaterMark);

        TextWaterMarkRequest textWaterMark = new TextWaterMarkRequest();
        textWaterMark.setText("我是一個(gè)水印");
        textWaterMark.setRotation(0);
        textWaterMark.setAlpha(1.0f);
        textWaterMark.setFontSize(24);
        textWaterMark.setIntervalHorizontal(10);
        textWaterMark.setIntervalVertical(10);
        textWaterMark.setFontColor("800000");
        textWaterMark.setTop(true);
        textWaterMark.setPageNo(pageNum);

        waterMarkInfo.setTextWaterMark(textWaterMark);

        return waterMarkInfo;
    }

}

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