依赖

        <!--poi-tl--><dependency><groupId>com.deepoove</groupId><artifactId>poi-tl</artifactId><version>1.12.1</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>5.2.2</version></dependency>

DocxUtil

import com.microsoft.schemas.office.office.CTLock;
import com.microsoft.schemas.vml.*;
import org.apache.poi.wp.usermodel.HeaderFooterType;
import org.apache.poi.xwpf.model.XWPFHeaderFooterPolicy;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFHeader;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.*;import java.io.InputStream;
import java.util.stream.Stream;import static org.openxmlformats.schemas.officeDocument.x2006.sharedTypes.STTrueFalse.FALSE;
import static org.openxmlformats.schemas.officeDocument.x2006.sharedTypes.STTrueFalse.T;/*** @author wangshuai9776* @date 2024/8/8 13:37*/
public class DocxUtil {//	public final static String DEFAULT_WATERMARK = "XXX科技有限公司"; // 后续按 系统设置获取public final static String DEFAULT_FONT_COLOR = "#d8d8d8";// 字体大小public static final String FONT_SIZE = "0.5pt";// 文本旋转角度public static final String STYLE_ROTATION = "-45";/*** 水印参数*/// private static final String fontColor = "#D3D3D3"; // 字体颜色/*** 艺术字水印参数*/private static final String fontName = "Microsoft YaHei"; // word字体// private static final String fontSize = "0.5pt"; // 字体大小private static final int widthPerWord = 10; // 一个字平均长度，单位pt，用于：计算文本占用的长度（文本总个数*单字长度）// private static final String styleRotation = "-45"; // 文本旋转角度private static final String SHAPE_TYPE = "#_x0000_t136"; // 形状类型：多边形private static final String SHAPE_SPID = "_x0000_s102";/*** word文字水印(调用poi封装的createWatermark方法)* @param doc XWPFDocument对象* @param markStr 水印文字*/public static void setWordWaterMark(XWPFDocument doc, String markStr,String fontColor) {XWPFParagraph paragraph = doc.createParagraph();XWPFHeaderFooterPolicy headerFooterPolicy = doc.getHeaderFooterPolicy();if (headerFooterPolicy == null) {headerFooterPolicy = doc.createHeaderFooterPolicy();}// create default Watermark - fill color black and not rotatedheaderFooterPolicy.createWatermark(markStr);// get the default header// Note: createWatermark also sets FIRST and EVEN headers// but this code does not updating those other headersXWPFHeader header = headerFooterPolicy.getHeader(XWPFHeaderFooterPolicy.DEFAULT);paragraph = header.getParagraphArray(0);
//            // get com.microsoft.schemas.vml.CTShape where fill color and rotation is setparagraph.getCTP().newCursor();org.apache.xmlbeans.XmlObject[] xmlobjects = paragraph.getCTP().getRArray(0).getPictArray(0).selectChildren(new javax.xml.namespace.QName("urn:schemas-microsoft-com:vml", "shape"));if (xmlobjects.length > 0) {CTShape ctshape = (CTShape) xmlobjects[0];ctshape.setFillcolor(fontColor);ctshape.setStyle(ctshape.getStyle() + ";rotation:315");}}/*** 以艺术字方式加上水印(平铺)* @param docx XWPFDocument对象* @param customText 水印文字*/public static void makeFullWaterMarkByWordArt(XWPFDocument docx, String customText,String fontColor,String fontSize,String styleRotation) {customText = customText + repeatString(" ", 16); // 水印文字之间使用8个空格分隔customText = repeatString(customText, 3); // 一行水印重复水印文字次数 //重复次数不能太多，内容过长会导致字体展示不出来。String styleTop = "0pt";  // 与顶部的间距if (docx == null) {return;}// 遍历文档，添加水印for (int lineIndex = -10; lineIndex < 20; lineIndex++) {styleTop = 200 * lineIndex + "pt";waterMarkDocXDocument(docx, customText, styleTop, 1,fontColor, fontSize ,styleRotation);}}/*** 以艺术字方式加上水印(单个)* @param docx XWPFDocument对象* @param customText 水印文字*/public static void makeWaterMarkByWordArt(XWPFDocument docx, String customText,String fontColor,String fontSize,String rotation) {String styleTop = "0pt";  // 与顶部的间距if (docx == null) {return;}// 添加水印waterMarkDocXDocument(docx, customText, styleTop, 2,fontColor,fontSize,rotation);}/*** 将指定的字符串重复repeats次.* @param pattern 字符串* @param repeats 重复次数* @return 生成的字符串*/private static String repeatString(String pattern, int repeats) {StringBuilder buffer = new StringBuilder(pattern.length() * repeats);Stream.generate(() -> pattern).limit(repeats).forEach(buffer::append);return new String(buffer);}/*** 为文档添加水印* 实现参考了{@link XWPFHeaderFooterPolicy#(String, int)}* @param doc 需要被处理的docx文档对象* @param customText 水印文本* @param type 类型：1.平铺；2.单个*/private static void waterMarkDocXDocument(XWPFDocument doc, String customText, String styleTop, int type,String fontColor,String fontSize,String rotation) {XWPFHeader header = doc.createHeader(HeaderFooterType.DEFAULT); // 如果之前已经创建过 DEFAULT 的Header，将会复用之int size = header.getParagraphs().size();if (size == 0) {header.createParagraph();}CTP ctp = header.getParagraphArray(0).getCTP();byte[] rsidr = doc.getDocument().getBody().getPArray(0).getRsidR();byte[] rsidrdefault = doc.getDocument().getBody().getPArray(0).getRsidRDefault();ctp.setRsidP(rsidr);ctp.setRsidRDefault(rsidrdefault);CTPPr ppr = ctp.addNewPPr();ppr.addNewPStyle().setVal("Header");for (int i = 0; i < 3; i++) {// 开始加水印CTR ctr = ctp.addNewR();CTRPr ctrpr = ctr.addNewRPr();ctrpr.addNewNoProof();CTGroup group = CTGroup.Factory.newInstance();CTShape shape = group.addNewShape();shape.setSpid(SHAPE_SPID);shape.setType(SHAPE_TYPE);if(type != 2){shape.setStyle(getShapeStyle(customText, styleTop,rotation)); // 设置形状样式（旋转，位置，相对路径等参数）}else{shape.setStyle(getShapeStyle()); // 设置形状样式（旋转，位置，相对路径等参数）}shape.setFillcolor(fontColor);shape.setStroked(FALSE); // 字体设置为实心CTLock lock = shape.addNewLock();lock.setExt(STExt.VIEW);CTTextPath shapeTextPath = shape.addNewTextpath(); // 绘制文本的路径shapeTextPath.setOn(T);shapeTextPath.setFitshape(T);shapeTextPath.setStyle("font-family:" + fontName + ";font-size:" + fontSize); // 设置文本字体与大小shapeTextPath.setString(customText+i);CTPicture pict = ctr.addNewPict();pict.set(group);}}/*** 加载docx格式的word文档* @param inputStream* @return*/private static XWPFDocument loadDocXDocument(InputStream inputStream) {XWPFDocument doc;try {doc = new XWPFDocument(inputStream);} catch (Exception e) {throw new RuntimeException("文档加载失败！！");}return doc;}/*** 构建Shape的样式参数* @param customText 水印文本* @return*/private static String getShapeStyle(String customText, String styleTop,String styleRotation) {StringBuilder sb = new StringBuilder();sb.append("position: ").append("absolute"); // 文本path绘制的定位方式sb.append(";width: ").append(customText.length() * widthPerWord).append("pt"); // 计算文本占用的长度（文本总个数*单字长度）sb.append(";height: ").append("20pt"); // 字体高度sb.append(";z-index: ").append("-251654144");sb.append(";mso-wrap-edited: ").append("f");sb.append(";margin-top: ").append(styleTop);sb.append(";mso-position-horizontal-relative: ").append("margin");sb.append(";mso-position-horizontal: ").append("center");sb.append(";mso-position-vertical-relative: ").append("margin");sb.append(";mso-position-vertical: ").append("left");sb.append(";rotation: ").append(styleRotation);return sb.toString();}/*** 构建Shape的样式参数* @return*/private static String getShapeStyle() {StringBuilder sb = new StringBuilder();sb.append("position: ").append("absolute"); // 文本path绘制的定位方式sb.append(";left: ").append("opt");sb.append(";width: ").append("500pt"); // 计算文本占用的长度（文本总个数*单字长度）sb.append(";height: ").append("150pt"); // 字体高度sb.append(";z-index: ").append("-251654144");sb.append(";mso-wrap-edited: ").append("f");sb.append(";margin-left: ").append("-50pt");sb.append(";margin-top: ").append("270pt");sb.append(";mso-position-horizontal-relative: ").append("margin");sb.append(";mso-position-vertical-relative: ").append("margin");sb.append(";mso-width-relative: ").append("page");sb.append(";mso-height-relative: ").append("page");sb.append(";rotation: ").append("-2949120f");return sb.toString();}}

调用

DocxUtil.makeFullWaterMarkByWordArt(doc, watermark, DocxUtil.DEFAULT_FONT_COLOR, DocxUtil.FONT_SIZE, DocxUtil.STYLE_ROTATION);

遇到的问题

word_256">部分客户给的word无法添加水印

• 在选取模式下 有水印
  
• 编辑模式下就看不见水印了
  

水印文案 过长会导致字变小变形 超过一定长度就会显示异常。消失等情况