在Java中将XLS转换为XLSX的实现方案

// 引入必要依赖（Maven）
<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>

// 核心转换逻辑
public class ExcelConverter {
    public static void convertXlsToXlsx(String inputPath, String outputPath) {
        try (InputStream inp = new FileInputStream(inputPath);
             Workbook wb = new HSSFWorkbook(inp)) { // 使用HSSF处理XLS
            
            XSSFWorkbook xssfWorkbook = new XSSFWorkbook();
            XSSFSheet xssfSheet = xssfWorkbook.createSheet("Converted Sheet");
            
            // 手动复制内容（需处理合并单元格/公式等复杂情况）
            for (int i = 0; i <= wb.getSheetAt(0).getLastRowNum(); i++) {
                Row srcRow = wb.getSheetAt(0).getRow(i);
                XSSFRow destRow = xssfSheet.createRow(i);
                
                for (int j = 0; j < srcRow.getLastCellNum(); j++) {
                    Cell srcCell = srcRow.getCell(j);
                    XSSFCell destCell = destRow.createCell(j);
                    
                    destCell.setCellValue(srcCell.getStringCellValue());
                }
            }
            
            FileOutputStream fileOut = new FileOutputStream(outputPath);
            xssfWorkbook.write(fileOut);
            fileOut.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

// 添加Maven依赖
<dependency>
    <groupId>com.github.Cloudmersive</groupId>
    <artifactId>Cloudmersive.APIClient.Java</artifactId>
    <version>v4.25</version>
</dependency>

// 调用云端API
public class CloudConverter {
    public static void main(String[] args) {
        ApiClient client = Configuration.getDefaultApiClient();
        client.setApiKey("YOUR_API_KEY");
        
        ConvertDocumentApi api = new ConvertDocumentApi();
        File inputFile = new File("input.xls");
        
        try {
            byte[] result = api.convertDocumentXlsToXlsx(inputFile);
            Files.write(Paths.get("output.xlsx"), result);
            System.out.println("Conversion completed successfully!");
        } catch (ApiException | IOException e) {
            System.err.println("Error during conversion: " + e.getMessage());
        }
    }
}