java生成Word图片水印的方式

您好，可以使用Apache POI库来生成Word图片水印。具体步骤如下：

1. 创建一个Word文档
2. 用addPicture将图片添加到文档中
3. 创建一个文本段落，并设置文本样式
4. 创建一个文字水印，将文本段落设置为水印
5. 将水印添加到文档中

您可以参考以下代码：

import java.io.FileOutputStream;

import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;
import org.apache.poi.xwpf.usermodel.XWPFPicture;
import org.apache.poi.xwpf.usermodel.XWPFPictureData;
import org.apache.poi.xwpf.usermodel.XWPFPictureFormat;
import org.apache.poi.xwpf.usermodel.XWPFPictureRun;
import org.apache.xmlbeans.XmlException;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTR;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTText;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTTextCharacterProperties;

public class WordWaterMark {
    public static void main(String[] args) throws Exception {
        String imagePath = "watermark.png";
        String text = "Draft";

        // create a new document
        XWPFDocument doc = new XWPFDocument();

        // add picture to the document
        XWPFPictureData pictureData = doc.addPictureData(new FileInputStream(imagePath), XWPFPictureFormat.PNG);
        XWPFPicture picture = doc.createPicture(pictureData, doc.getNextPicNameNumber(XWPFPicture.SIGNATURE_PICT_TYPE), 1000, 1000);
        // set position and size of the picture
        XWPFPictureRun pictureRun = (XWPFPictureRun) picture.getParagraph().createRun();
        pictureRun.addPicture(pictureData);
        pictureRun.getCTR().getTxbx().addNewTxbxContent().addNewP().addNewR().addNewT().setStringValue("");
        pictureRun.getCTR().getTxbx().addNewTxbxContent().addNewPict().set(picture.getCTPicture());

        // create a paragraph for the watermark text
        XWPFParagraph waterMarkParagraph = doc.createParagraph();
        waterMarkParagraph.setSpacingBefore(0);
        waterMarkParagraph.setSpacingAfter(0);
        waterMarkParagraph.setSpacingBetween(1.5);
        // create a run for the watermark text
        XWPFRun run = waterMarkParagraph.createRun();
        run.setText(text);
        // set font and color for the watermark text
        CTR ct = run.getCTR();
        CTText textElement = ct.getTArray(0);
        CTTextCharacterProperties textProps = textElement.addNewRPr();
        textProps.setSz(STMUtils.pt2dxa(48));
        textProps.setColor("999999");
        textProps.setShadow(null);

        // create a watermark
        CTR cTR = CTR.Factory.parse(
                "<w:p xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\" xmlns:wx=\"http://schemas.microsoft.com/office/word/2003/auxHint\" xmlns:mc=\"http://schemas.openxmlformats.org/markup-compatibility/2006\" xmlns:a=\"http://schemas.openxmlformats.org/drawingml/2006/main\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\" xmlns:m=\"http://schemas.openxmlformats.org/officeDocument/2006/math\" xmlns:v=\"urn:schemas-microsoft-com:vml\" mc:Ignorable=\"w14 w15 wx\" w:rsidR=\"00A81A2C\" w:rsidRPr=\"00A81A2C\">"
                        + "<w:pPr>"
                        + "<w:pStyle w:val=\"NoSpacing\"/>"
                        + "<w:rPr>"
                        + "<w:b/>"
                        + "<wx:font wx:val=\"Cambria\"/>"
                        + "<w:color w:val=\"auto\"/>"
                        + "<w:sz w:val=\"20\"/>"
                        + "<w:szCs w:val=\"20\"/>"
                        + "</w:rPr>"
                        + "</w:pPr>"
                        + "<w:r>"
                        + "<w:rPr>"
                        + "<w:b/>"
                        + "<wx:font wx:val=\"Cambria\"/>"
                        + "<w:color w:val=\"auto\"/>"
                        + "<w:sz w:val=\"20\"/>"
                        + "<w:szCs w:val=\"20\"/>"
                        + "</w:rPr>"
                        + "<w:t xml:space=\"preserve\">" + text + "</w:t>"
                        + "</w:r>"
                        + "</w:p>");
        XWPFParagraph waterMark = new XWPFParagraph(cTR, doc);
        waterMark.setAlignment(ParagraphAlignment.CENTER);
        waterMark.setVerticalAlignment(TextAlignment.CENTER);

        // set watermark as background of each page
        for (XWPFParagraph paragraph : doc.getParagraphs()) {
            for (XWPFRun r : paragraph.getRuns()) {
                r.getCTR().getTArray(0).insertNewRPr(0).addNewNoProof();
            }
        }
        doc.addParagraph(waterMark);

        // write the document to a file
        FileOutputStream out = new FileOutputStream("watermark.docx");
        doc.write(out);
        out.close();
    }
}