使用Apache POI API将xlsx转换为csv

我试图将.xlsx文件转换为.csv ，转换正在发生，但数据格式不正确。 请在下面找到代码，并建议更改代码。

在这里，我试图读取一个.xlsx文件并将其写入csv文件，即将xlsx转换为csv但是我没有以正确的格式获取.csv文件所有数据都显示在一个单独但它必须在Excel中显示为行。

import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.Iterator; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class XlsxtoCSV { static void xlsx(File inputFile, File outputFile) { // For storing data into CSV files StringBuffer data = new StringBuffer(); try { FileOutputStream fos = new FileOutputStream(outputFile); // Get the workbook object for XLSX file XSSFWorkbook wBook = new XSSFWorkbook(new FileInputStream(inputFile)); // Get first sheet from the workbook XSSFSheet sheet = wBook.getSheetAt(0); Row row; Cell cell; // Iterate through each rows from first sheet Iterator rowIterator = sheet.iterator(); while (rowIterator.hasNext()) { row = rowIterator.next(); // For each row, iterate through each columns Iterator cellIterator = row.cellIterator(); while (cellIterator.hasNext()) { cell = cellIterator.next(); switch (cell.getCellType()) { case Cell.CELL_TYPE_BOOLEAN: data.append(cell.getBooleanCellValue() + ","); break; case Cell.CELL_TYPE_NUMERIC: data.append(cell.getNumericCellValue() + ","); break; case Cell.CELL_TYPE_STRING: data.append(cell.getStringCellValue() + ","); break; case Cell.CELL_TYPE_BLANK: data.append("" + ","); break; default: data.append(cell + ","); } } } fos.write(data.toString().getBytes()); fos.close(); } catch (Exception ioe) { ioe.printStackTrace(); } } //testing the application public static void main(String[] args) { //reading file from desktop File inputFile = new File("C:\\Users\\user69\\Desktop\\test.xlsx"); //writing excel data to csv File outputFile = new File("C:\\Users\\user69\\Desktop\\test1.csv"); xlsx(inputFile, outputFile); } } 

Answer 1

这是谢谢@Swapnil！

 data.append("\r\n"); // After the columns have been appended. 

Answer 2

 public static void convertToXlsx(File inputFile, File outputFile) { StringBuffer bf = new StringBuffer(); FileOutputStream fos = null; String strGetValue = ""; try { fos = new FileOutputStream(outputFile); XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream(inputFile)); XSSFSheet sheet = wb.getSheetAt(0); Row row; Cell cell; int intRowCounter = 0; Iterator rowIterator = sheet.iterator(); while (rowIterator.hasNext()) { StringBuffer cellDData = new StringBuffer(); row = rowIterator.next(); int maxNumOfCells = sheet.getRow(0).getLastCellNum(); int cellCounter = 0; while ((cellCounter) < maxNumOfCells) { if (sheet.getRow(row.getRowNum()) != null && sheet.getRow(row.getRowNum()).getCell(cellCounter) != null) { cell = sheet.getRow(row.getRowNum()).getCell(cellCounter); switch (cell.getCellType()) { case Cell.CELL_TYPE_BOOLEAN: strGetValue = cell.getBooleanCellValue() + ","; cellDData.append(removeSpace(strGetValue)); break; case Cell.CELL_TYPE_NUMERIC: strGetValue = new BigDecimal(cell.getNumericCellValue()).toPlainString(); if (DateUtil.isCellDateFormatted(cell)) { strGetValue = new DataFormatter().formatCellValue(cell); } else { strGetValue = new BigDecimal(cell.getNumericCellValue()).toPlainString(); } String tempStrGetValue = removeSpace(strGetValue); if (tempStrGetValue.length() == 0) { strGetValue = " ,"; cellDData.append(strGetValue); } else { strGetValue = strGetValue + ","; cellDData.append(removeSpace(strGetValue)); } break; case Cell.CELL_TYPE_STRING: strGetValue = cell.getStringCellValue(); String tempStrGetValue1 = removeSpace(strGetValue); if (tempStrGetValue1.length() == 0) { strGetValue = " ,"; cellDData.append(strGetValue); } else { strGetValue = strGetValue + ","; cellDData.append(removeSpace(strGetValue)); } break; case Cell.CELL_TYPE_BLANK: strGetValue = "" + ","; cellDData.append(removeSpace(strGetValue)); break; default: strGetValue = cell + ","; cellDData.append(removeSpace(strGetValue)); } } else { strGetValue = " ,"; cellDData.append(strGetValue); } cellCounter++; } String temp = cellDData.toString(); if (temp != null && temp.contains(",,,")) { temp = temp.replaceFirst(",,,", ", ,"); } if (temp.endsWith(",")) { temp = temp.substring(0, temp.lastIndexOf(",")); cellDData = null; bf.append(temp.trim()); } bf.append("\n"); intRowCounter++; } fos.write(bf.toString().getBytes()); fos.close(); } catch (Exception ex) { ex.printStackTrace(); } finally { try { if (fos != null) fos.close(); } catch (Exception ex) { ex.printStackTrace(); } } } private static String removeSpace(String strString) { if (strString != null && !strString.equals("")) { return strString.trim(); } return strString; } 

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1. 代码示例句柄和单元格中的空格字符
   

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