1. 导入相关库

import org.apache.tika.Tika;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.AutoDetectParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.PasswordProvider;
import org.apache.tika.parser.Parser;
import org.apache.tika.parser.pdf.PDFParserConfig;
import org.apache.tika.sax.BodyContentHandler;

2. 设置密码提供程序

PasswordProvider passwordProvider = new PasswordProvider() {
   @Override
   public String getPassword(Metadata metadata) {
       return "example_password"; //修改为实际密码
   }
};

3. 设置 PDF 解析器配置

PDFParserConfig pdfParserConfig = new PDFParserConfig();
pdfParserConfig.setExtractInlineImages(true); // 修改为实际需要的设置

4. 创建解析器和解析内容

String filePath = "/path/to/protected.pdf"; // 修改为实际的文件路径
Parser parser = new AutoDetectParser();
ParseContext parseContext = new ParseContext();
parseContext.set(PasswordProvider.class, passwordProvider);
parseContext.set(PDFParserConfig.class, pdfParserConfig);
Metadata metadata = new Metadata();
StringWriter writer = new StringWriter();
try {
   InputStream stream = new FileInputStream(new File(filePath));
   parser.parse(stream, new BodyContentHandler(writer), metadata, parseContext);
} catch (IOException | SAXException | TikaException e) {
   e.printStackTrace();
}

5. 获取解析结果

String plainText = writer.toString();
String contentType = new Tika().detect(new File(filePath));

通过以上步骤，我们可以成功解析密码保护的 PDF 文件。