java 给word文件添加图片水印

好的，您想了解如何使用 Java 给 Word 文档添加图片水印。首先，您需要使用 Apache POI 库来读取和编辑 Word 文件。然后，您可以使用 Java Graphics2D 类来在 Word 文档中添加水印。下面是一个示例代码：

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

public class AddWatermarkToWord {
   public static void main(String[] args) {
      try {
         // 读取 Word 文档
         InputStream inputStream = new FileInputStream("yourfile.docx");
         XWPFDocument document = new XWPFDocument(inputStream);

         // 在每个段落上添加水印
         for (XWPFParagraph paragraph : document.getParagraphs()) {
            // 在段落的开头添加水印
            XWPFRun run = paragraph.createRun();
            run.setText("your watermark text");
            run.getCTR().addNewRPr().addNewNoProof().setVal(org.apache.xmlbeans.XmlBoolean.TRUE);

            // 添加图片水印
            BufferedImage watermarkImage = ImageIO.read(new File("your watermark image file path"));
            int imageWidth = watermarkImage.getWidth();
            int imageHeight = watermarkImage.getHeight();
            int documentWidth = (int) (paragraph.getDocument().getPageSize().getWidth()/XWPFDocument.PT_PER_INCH);
            int documentHeight = (int) (paragraph.getDocument().getPageSize().getHeight()/XWPFDocument.PT_PER_INCH);
            int imageX = (documentWidth/2) - (imageWidth/2);
            int imageY = (documentHeight/2) - (imageHeight/2);

            Graphics2D graphics = run.getCTR().addNewDrawing().addNewInline().addNewGraphic().addNewGraphicData().addNewPic().addNewBlipFill().addNewBlip();
            graphics.setComposite(java.awt.AlphaComposite.getInstance(java.awt.AlphaComposite.SRC_OVER, 0.5f));
            graphics.drawImage(watermarkImage, imageX, imageY, imageWidth, imageHeight, null);
         }

         // 保存 Word 文档
         FileOutputStream outputStream = new FileOutputStream("watermarkedfile.docx");
         document.write(outputStream);
         outputStream.close();
         document.close();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}

这就是如何使用 Java 给 Word 文档添加图片水印。希望能对您有所帮助！