Question

我正在尝试将xls文件转换为csv。问题是xls文件（我无法更改）以excel 2工作表版本的形式出现，当您打开它时，您会收到以下消息： “受保护的视图，由于您的策略设置，不允许编辑此文件类型。单击以获取更多详细信息。”

因此，由于出现以下异常，因此无法转换xls文件：

Exception in thread "main" org.apache.poi.poifs.filesystem.NotOLE2FileException: Invalid header signature; read 0x0010000200040009, expected 0xE11AB1A1E011CFD0 - Your file appears not to be a valid OLE2 document
    at org.apache.poi.poifs.storage.HeaderBlock.<init>(HeaderBlock.java:151)
    at org.apache.poi.poifs.storage.HeaderBlock.<init>(HeaderBlock.java:117)
    at org.apache.poi.poifs.filesystem.POIFSFileSystem.<init>(POIFSFileSystem.java:294)
    at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:400)
    at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:381)
    at exceltocsv.ExcelToCSV.main(ExcelToCSV.java:41)

出于测试目的，我删除了保护，因此可以将xls文件保存到新的xls中，并且可以正常工作。但是我不希望用户在运行代码之前操纵文件。

这是我从http://thinktibits.blogspot.com/2012/12/convert-xls-to-csv-in-java-example.html那里获得的代码

try (
  FileInputStream input_document = new FileInputStream(new File("C:\\Users\\afusa\\Documents\\NetBeansProjects\\ExcelToCSV\\src\\exceltocsv\\201904TM.xls"))) {
            HSSFWorkbook my_xls_workbook = new HSSFWorkbook(input_document);
            HSSFSheet my_worksheet = my_xls_workbook.getSheetAt(0);
            Iterator<Row> rowIterator = my_worksheet.iterator();
            FileWriter my_csv = new FileWriter("C:\\Users\\afusa\\Documents\\NetBeansProjects\\ExcelToCSV\\src\\exceltocsv\\convertedCSVFile.csv");
            try (CSVWriter my_csv_output = new CSVWriter(my_csv)) {
                while (rowIterator.hasNext()) {
                    Row row = rowIterator.next();
                    int i = 0;
                    String[] csvdata = new String[35];
                    Iterator<Cell> cellIterator = row.cellIterator();
                    while (cellIterator.hasNext()) {
                        Cell cell = cellIterator.next();
                        CellType cellType = cell.getCellType();
                        if (cellType == CellType.STRING || cellType == CellType.BLANK) {
                            csvdata[i] = cell.getStringCellValue();
                        } else if (cellType == CellType.NUMERIC) {
                            csvdata[i] = String.valueOf(cell.getNumericCellValue());
                        }

                        i = i + 1;
                    }
                    my_csv_output.writeNext(csvdata);
                }
            }
        }

有什么方法可以实现这种转换而无需用户事先操纵excel文件？

Answer 1

Excel到CSV转换

package test;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

public class ExcelReading {

    public static void echoAsCSV(Sheet sheet) throws IOException {
       StringBuffer sb=new StringBuffer();
        Row row = null;
        for (int i = 0; i <= sheet.getLastRowNum(); i++) {
            row = sheet.getRow(i);
            for (int j = 0; j < row.getLastCellNum(); j++) {
                sb.append(row.getCell(j) +",");
            }
            sb.append("\n");

        }

        FileOutputStream filout=new FileOutputStream("D:/fileOut.csv");
        byte[] strToBytes = sb.toString().getBytes();         
        filout.write(strToBytes);
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        InputStream inp = null;
        try {
            inp = new FileInputStream("D:\\Book1.xlsx");
            Workbook wb = WorkbookFactory.create(inp);

            for(int i=0;i<wb.getNumberOfSheets();i++) {
                System.out.println(wb.getSheetAt(i).getSheetName());
                echoAsCSV(wb.getSheetAt(i));
            }
        } catch (InvalidFormatException ex) {
            Logger.getLogger(ExcelReading.class.getName()).log(Level.SEVERE, null, ex);
        } catch (FileNotFoundException ex) {
            Logger.getLogger(ExcelReading.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(ExcelReading.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            try {
                inp.close();
            } catch (IOException ex) {
                Logger.getLogger(ExcelReading.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }
}

将受保护的xls转换为csv java

1 个答案: