<dependencies>
    <!-- Spire.Doc for Java（Free 版本示例，版本號可按需調整） -->
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.doc.free</artifactId>
        <version>5.2.0</version>
    </dependency>
</dependencies>
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<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <url>https://repo.e-iceblue.cn/repository/maven-public/</url>
    </repository>
</repositories>

import com.spire.doc.Document;
import com.spire.doc.FileFormat;
import com.spire.doc.TextWatermark;
import com.spire.doc.documents.WatermarkLayout;
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import java.awt.Color;
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public class DocxWatermarkExample {
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    public static void addWatermarkToDocx(String inputPath, String outputPath, String watermarkText) {
        // 1. 加載 DOCX 文檔
        Document document = new Document();
        document.loadFromFile(inputPath, FileFormat.Docx);
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        // 2. 創(chuàng)建文字水印
        TextWatermark watermark = new TextWatermark();
        watermark.setText(watermarkText);              // 如："xx公司"
        watermark.setFontSize(40);                     // 字號
        watermark.setColor(Color.lightGray);           // 顏色
        watermark.setLayout(WatermarkLayout.Diagonal); // 斜對角
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        // 3. 通過 Section 的 Document 設置水?。ü俜酵扑]方式）
        if (document.getSections().getCount() > 0) {
            document.getSections().get(0).getDocument().setWatermark(watermark);
        } else {
            // 極端情況下沒有 section，可退回到直接設置
            document.setWatermark(watermark);
        }
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        // 4. 保存為新的 DOCX
        document.saveToFile(outputPath, FileFormat.Docx);
        document.close();
    }
}

import com.spire.doc.Document;
import com.spire.doc.FileFormat;
import com.spire.doc.TextWatermark;
import com.spire.doc.documents.WatermarkLayout;
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import java.awt.Color;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
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public class DocxWatermarkUtil {
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    public static byte[] addWatermarkToDocx(InputStream inputStream, String watermarkText) throws Exception {
        try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            Document document = new Document();
            document.loadFromStream(inputStream, FileFormat.Docx);
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            TextWatermark watermark = new TextWatermark();
            watermark.setText(watermarkText);
            watermark.setFontSize(40);
            watermark.setColor(Color.lightGray);
            watermark.setLayout(WatermarkLayout.Diagonal);
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            if (document.getSections().getCount() > 0) {
                document.getSections().get(0).getDocument().setWatermark(watermark);
            } else {
                document.setWatermark(watermark);
            }
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            document.saveToStream(out, FileFormat.Docx);
            document.close();
            return out.toByteArray();
        }
    }
}

import com.spire.doc.Document;
import com.spire.doc.FileFormat;
import com.spire.doc.TextWatermark;
import com.spire.doc.documents.WatermarkLayout;
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import java.awt.Color;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
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public class DocWatermarkUtil {
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    public static byte[] addWatermarkToDoc(InputStream inputStream, String watermarkText) throws Exception {
        try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            Document document = new Document();
            document.loadFromStream(inputStream, FileFormat.Doc);
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            TextWatermark watermark = new TextWatermark();
            watermark.setText(watermarkText);
            watermark.setFontSize(40);
            watermark.setColor(Color.lightGray);
            watermark.setLayout(WatermarkLayout.Diagonal);
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            if (document.getSections().getCount() > 0) {
                document.getSections().get(0).getDocument().setWatermark(watermark);
            } else {
                document.setWatermark(watermark);
            }
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            document.saveToStream(out, FileFormat.Doc);
            document.close();
            return out.toByteArray();
        }
    }
}