java关于如何实现读取各种类型的文件核心属性方法，比如获取标题和作者、主题等；附带远程的https的地址文件读取方法；

有两种方法：

通过提供的现成api进行调用读取pdf文件，或doc、xlsx、pptx文件；可能商业需要付费

https://www.e-iceblue.cn/pdf_java_document_operation/set-pdf-document-properties-in-java.html

Spire.PDF for Java

java 复制代码

import com.spire.pdf.*;
import java.io.*;

public class getPDFProperties {
    public static void main(String[] args) throws IOException {
        //创建 PdfDocument 类的对象
        PdfDocument pdf = new PdfDocument();

        //从磁盘加载PDF文档
        pdf.loadFromFile("" + "setPDFProperties.pdf");

        //创建 StringBuilder 的对象以储存获取的属性数据
        StringBuilder stringBuilder = new StringBuilder();

        //获取PDF文档的属性数据并储存于创建的 StringBuilder
        stringBuilder.append("标题：" + pdf.getDocumentInformation().getTitle() + "\r\n");
        stringBuilder.append("作者" + pdf.getDocumentInformation().getAuthor() + "\r\n");
        stringBuilder.append("主题：" + pdf.getDocumentInformation().getSubject() + "\r\n");
        stringBuilder.append("关键词：" + pdf.getDocumentInformation().getKeywords() + "\r\n");
        stringBuilder.append("创建者：" + pdf.getDocumentInformation().getCreator() + "\r\n");
        stringBuilder.append("创建时间：" + pdf.getDocumentInformation().getCreationDate() + "\r\n");
        stringBuilder.append("制作工具：" + pdf.getDocumentInformation().getProducer() + "\r\n");

        //创建一个TXT文件
        File file = new File("getPDFProperties.txt");
        file.createNewFile();

        //将 StringBuilder 写入TXT文件
        FileWriter fileWriter = new FileWriter(file, true);
        BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
        bufferedWriter.write(stringBuilder.toString());
        bufferedWriter.flush();
    }
}

第二种方法：

通过Apache POI进行读取实现；另外不同版本方法实现也会有所不同；

Apache POI 的不同版本

引入依赖

java 复制代码

        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.24</version> <!-- 请检查最新版本 -->
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.11.0</version> <!-- 检查是否有更新的版本 -->
        </dependency>

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.17.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>5.2.2</version> <!-- 请检查最新版本 -->
            <exclusions>
                <exclusion>
                    <groupId>org.apache.logging.log4j</groupId>
                    <artifactId>log4j-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

最后直接提供方法实现：

java 复制代码

package com.ruoyi.project.backstage.pdf;


import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDDocumentInformation;
import org.apache.poi.ooxml.POIXMLDocument;
import org.apache.poi.ooxml.POIXMLProperties;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.xslf.usermodel.XMLSlideShow;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.CTProperties;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.XmlOptions;
import org.apache.xmlbeans.impl.values.XmlComplexContentImpl;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

/**
 * @className: FileUtils
 * @author: 3.0
 * @date: 2024/10/16
 * @Version: 1.0
 * @description:
 */

public class FileUtils {

//    public static void main(String[] args) {
//        try (PDDocument document = PDDocument.load(new File("E:\\project\\" + "1.pdf"))) {
//            PDDocumentInformation info = document.getDocumentInformation();
//            System.out.println("Title: " + info.getTitle());
//            System.out.println("Author: " + info.getAuthor());
//            System.out.println("Subject: " + info.getSubject());
//            // 其他属性...
//        } catch (IOException e) {
//            e.printStackTrace();
//        }
//
//    }

//    public static void main(String[] args) throws Exception {
//        XWPFDocument doc = new XWPFDocument(new FileInputStream(new File("E:\\project\\log.sh用法(1).docx")));
        CTProperties coreProps = doc.getProperties().getCoreProperties();
//        POIXMLProperties.CoreProperties coreProps = doc.getProperties().getCoreProperties();
//        System.out.println("Title: " + coreProps.getTitle());
//        System.out.println("Author: " + coreProps.getCreator());
//        System.out.println("主题: " + coreProps.getSubject());
//        // 更多属性...
//        doc.close();
//    }


    public static void main(String[] args) throws Exception {
        Workbook workbook = WorkbookFactory.create(new FileInputStream(new File("E:\\project\\工作簿1 - 副本.xls")));
        if (workbook instanceof POIXMLDocument) {
            POIXMLDocument poixmlDocument = (POIXMLDocument) workbook;
            POIXMLProperties properties = poixmlDocument.getProperties();
            POIXMLProperties.CoreProperties coreProperties = properties.getCoreProperties();

            // 现在你可以访问核心属性了
            String title = coreProperties.getTitle();
            String subject = coreProperties.getSubject();
            String creator = coreProperties.getCreator();
            // ... 其他属性

            // 打印属性到控制台
            System.out.println("Title: " + title);
            System.out.println("Subject: " + subject);
            System.out.println("Creator: " + creator);
            // ...
        } else {
            System.out.println("The workbook is not a POIXMLDocument (not an .xlsx file?).");
        }

        // 关闭工作簿（在try-with-resources中自动关闭fis，但这里显式关闭workbook以强调）
        workbook.close();
    }
//
//    public static void main(String[] args) throws Exception {
//        XMLSlideShow ppt = new XMLSlideShow(OPCPackage.open(new FileInputStream(new File("E:\\project\\演示文稿1.pptx"))));
//        System.out.println("Title: " + ppt.getProperties().getCoreProperties().getTitle());
//        System.out.println("Author: " + ppt.getProperties().getCoreProperties().getCreator());
//        System.out.println("主题: " + ppt.getProperties().getCoreProperties().getSubject());
//        // 更多属性...
//        ppt.close();
//    }

}

如果有需要读取https地址的需求；可以实现下面的：

从远程 HTTPS URL 读取文件并将其转换为 FileInputStream 对象，你可以先将远程文件下载到本地磁盘，然后再使用 FileInputStream 打开它。以下是实现这一过程的一种方法：

下载文件到本地：

1、使用 Java 的 HttpURLConnection 或者 HttpClient 等工具来下载文件。

2、创建 FileInputStream：使用下载后的本地文件路径创建 FileInputStream。

java 复制代码

    public static void main(String[] args) throws Exception {
        String remoteUrl = "http://s3.api.com/diaoyun//survey/answer/.xlsx";
        String localPath = "E:\\project\\file11.xlsx"; // 本地临时文件路径
        downloadFileFromURL(remoteUrl, localPath);
        File file = new File(localPath);
        FileInputStream fileInputStream = new FileInputStream(file);
        Workbook workbook = WorkbookFactory.create(fileInputStream);
//        Workbook workbook = WorkbookFactory.create(new FileInputStream(new File("E:\\project\\工作簿1 - 副本.xls")));
        if (workbook instanceof POIXMLDocument) {
            POIXMLDocument poixmlDocument = (POIXMLDocument) workbook;
            POIXMLProperties properties = poixmlDocument.getProperties();
            POIXMLProperties.CoreProperties coreProperties = properties.getCoreProperties();

            // 现在你可以访问核心属性了
            String title = coreProperties.getTitle();
            String subject = coreProperties.getSubject();
            String creator = coreProperties.getCreator();
            // ... 其他属性

            // 打印属性到控制台
            System.out.println("Title: " + title);
            System.out.println("Subject: " + subject);
            System.out.println("Creator: " + creator);
            // ...
        } else {
            System.out.println("The workbook is not a POIXMLDocument (not an .xlsx file?).");
        }

        // 关闭工作簿（在try-with-resources中自动关闭fis，但这里显式关闭workbook以强调）
        workbook.close();
        file.delete();
    }

    private static void downloadFileFromURL(String urlStr, String localPath) throws IOException {
        URL url = new URL(urlStr);
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        try (InputStream in = urlConnection.getInputStream();
             FileOutputStream out = new FileOutputStream(localPath)) {
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = in.read(buffer)) != -1) {
                out.write(buffer, 0, bytesRead);
            }
        }
    }