java给word添加平铺水印无法解决，求帮助

Question

这是我的代码，想要用java给word添加平铺水印，代码不报错，但是水印没加上，只有doc那个红头文字，求帮助，急
import com.spire.doc.Document;
import com.spire.doc.FileFormat;
import com.spire.doc.HeaderFooter;
import com.spire.doc.Section;
import com.spire.doc.documents.Paragraph;
import com.spire.doc.documents.ShapeLineStyle;
import com.spire.doc.documents.ShapeType;
import com.spire.doc.fields.ShapeObject;
import java.awt.*;
public class multiTextWatermark {
public static void main(String[] args) {
//加载示例文档
Document doc = new Document();
doc.loadFromFile("C:\Users\Test1\Desktop\Sample.docx");
//添加艺术字并设置大小
ShapeObject shape = new ShapeObject(doc, ShapeType.Text_Plain_Text);
shape.setWidth(60);
shape.setHeight(20);
//设置艺术字文本内容、颜色，位置及样式
shape.setVerticalPosition(30);
shape.setHorizontalPosition(20);
shape.setRotation(315);
shape.getWordArt().setText("内部使用");
shape.setFillColor(Color.green);
shape.setLineStyle(ShapeLineStyle.Single);
shape.setStrokeColor(new Color(192, 192, 192, 255));
shape.setStrokeWeight(1);

     Section section;
     HeaderFooter header;
     for (int n = 0; n < doc.getSections().getCount(); n++) {
         section = doc.getSections().get(n);
         //获取section的页眉
         header = section.getHeadersFooters().getHeader();
         Paragraph paragraph1;
         for (int i = 0; i < 4; i++) {
             //添加段落到页眉
             paragraph1 = header.addParagraph();
             for (int j = 0; j < 3; j++) {
                 //复制艺术字并设置多行多列位置
                 shape = (ShapeObject) shape.deepClone();
                 shape.setVerticalPosition(50 + 150 * i);
                 shape.setHorizontalPosition(20 + 160 * j);
                 paragraph1.getChildObjects().add(shape);
             }
         }
     }
     //保存文档
     doc.saveToFile("output/multi-lineTextwatermark.docx", FileFormat.Docx_2013);
 }

}

Answer 1

增加一行，字体的设定：

shape.getWordArt().setFontFamily("宋体");

效果：