使用Apache POI打开.docx并使用密码保存它

要使用Apache POI打开.docx文件并使用密码保存，您首先需要确保已经安装了Apache POI库

导入依赖项

在项目的pom.xml文件中，添加以下依赖项：

<dependencies>
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml</artifactId>
        <version>5.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml-schemas</artifactId>
        <version>4.1.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.xmlbeans</groupId>
        <artifactId>xmlbeans</artifactId>
        <version>5.1.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-collections4</artifactId>
        <version>4.4</version>
    </dependency>
</dependencies>

编写代码

import java.io.*;

import org.apache.poi.poifs.crypt.*;
import org.apache.poi.poifs.crypt.standard.*;
import org.apache.poi.xwpf.usermodel.*;

public class DocxWithPassword {
    public static void main(String[] args) throws Exception {
        String inputFilePath = "example.docx";
        String outputFilePath = "example_password_protected.docx";
        String password = "your_password_here";

        try (FileInputStream fis = new FileInputStream(inputFilePath)) {
            XWPFDocument document = new XWPFDocument(fis);

            // 创建POIFS文档加密对象
            POIFSFileSystem fs = new POIFSFileSystem();
            EncryptionInfo info = new EncryptionInfo(EncryptionMode.xor);

            // 创建加密对象
            Encryptor encryptor = info.getEncryptor();
            encryptor.confirmPassword(password);

            // 使用加密对象对文档进行加密
            try (FileOutputStream fos = new FileOutputStream(outputFilePath)) {
                document.write(encryptor.getDataStream(fs));
                fs.writeFilesystem(fos);
            }

            System.out.println("Document successfully encrypted with password: " + password);
        }
    }
}