java读取excel文件为base64实现方式

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>5.2.3</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>5.2.3</version>
</dependency>

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Base64;

public class ExcelToBase64 {

    public static String convertExcelToBase64(String filePath) throws IOException {
        // 读取 Excel 文件为字节数组
        FileInputStream fis = new FileInputStream(filePath);
        Workbook workbook = WorkbookFactory.create(fis);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        workbook.write(bos);
        byte[] excelBytes = bos.toByteArray();

        // 关闭资源
        bos.close();
        workbook.close();
        fis.close();

        // 转换为 Base64
        return Base64.getEncoder().encodeToString(excelBytes);
    }

    public static void main(String[] args) {
        try {
            String base64 = convertExcelToBase64("example.xlsx");
            System.out.println("Base64: " + base64);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>3.3.2</version>
</dependency>

import com.alibaba.excel.EasyExcel;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Base64;

public class ExcelToBase64Easy {

    public static String convertToBase64(String filePath) throws IOException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        EasyExcel.write(bos).withTemplate(new FileInputStream(filePath)).sheet().doWrite();
        byte[] bytes = bos.toByteArray();
        bos.close();
        return Base64.getEncoder().encodeToString(bytes);
    }

    public static void main(String[] args) throws IOException {
        String base64 = convertToBase64("large_file.xlsx");
        System.out.println("Base64: " + base64.substring(0, 50) + "...");
    }
}