java将.xls转换为csv
我已经使用Apache POI库转换为.xls文件到一个csv文件。 我遍历每行和单元格，放一个逗号，并追加到缓冲的阅读器。 单元格types数字和string完美转换。 如果一个空白单元格出现，我把一个逗号，但没有检测到空白值的代码。 怎么做？ 请帮我一下
import java.io.*; import java.util.Iterator; import java.text.DateFormat; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import java.text.DecimalFormat; import java.text.NumberFormat; import java.math.BigDecimal; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; 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; import org.apache.poi.xssf.usermodel.XSSFRichTextString; import org.apache.poi.hssf.usermodel.HSSFDateUtil; import org.apache.poi.ss.usermodel.DateUtil; class convert { static void convertToXls(File inputFile, File outputFile) { StringBuffer cellDData = new StringBuffer(); String cellDDataString=null; try { FileOutputStream fos = new FileOutputStream(outputFile); HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile)); HSSFSheet sheet = workbook.getSheetAt(0); Cell cell=null; Row row; int previousCell; int currentCell; Iterator<Row> rowIterator = sheet.iterator(); while (rowIterator.hasNext()) { previousCell = -1; currentCell = 0; row = rowIterator.next(); System.out.println("ROW:-->"); Iterator<Cell> cellIterator = row.cellIterator(); while (cellIterator.hasNext()) { // System.out.println("true" +cellIterator.hasNext()); cell = cellIterator.next(); currentCell = cell.getColumnIndex(); System.out.println("CELL:-->" +cell.toString()); try{ switch (cell.getCellType()) { case Cell.CELL_TYPE_BOOLEAN: cellDData.append(cell.getBooleanCellValue() + ","); System.out.println("boo"+ cell.getBooleanCellValue()); break; case Cell.CELL_TYPE_NUMERIC: if (DateUtil.isCellDateFormatted(cell)) { // System.out.println(cell.getDateCellValue()); SimpleDateFormat dateFormat = new SimpleDateFormat( "dd/MM/yyyy"); String strCellValue = dateFormat.format(cell.getDateCellValue()); // System.out.println("date:"+strCellValue); cellDData.append(strCellValue +","); } else { System.out.println(cell.getNumericCellValue()); Double value = cell.getNumericCellValue(); Long longValue = value.longValue(); String strCellValue1 = new String(longValue.toString()); // System.out.println("number:"+strCellValue1); cellDData.append(strCellValue1 +","); } // cellDData.append(cell.getNumericCellValue() + ","); //String i=(new java.text.DecimalFormat("0").format( cell.getNumericCellValue()+"," )); //System.out.println("number"+cell.getNumericCellValue()); break; case Cell.CELL_TYPE_STRING: String out=cell.getRichStringCellValue().getString(); cellDData.append(cell.getRichStringCellValue().getString() + ","); //System.out.println("string"+cell.getStringCellValue()); break; case Cell.CELL_TYPE_BLANK: cellDData.append("" + "THIS IS BLANK"); System.out.print("THIS IS BLANK"); break; default: break; }} catch (NullPointerException e) { //do something clever with the exception System.out.println("nullException"+e.getMessage()); } } int len=cellDData.length() - 1; // System.out.println("length:"+len); // System.out.println("length1:"+cellDData.length()); cellDData.replace(cellDData.length() - 1, cellDData.length() , ""); cellDData.append("\n"); } //cellDData.append("\n"); //String out=cellDData.toString(); //System.out.println("res"+out); //String o = out.substring(0, out.lastIndexOf(",")); //System.out.println("final"+o); fos.write(cellDData.toString().getBytes()); //fos.write(cellDDataString.getBytes()); fos.close(); } catch (FileNotFoundException e) { System.err.println("Exception" + e.getMessage()); } catch (IOException e) { System.err.println("Exception" + e.getMessage()); } } public static void main(String[] args) throws IOException { File inputFile = new File("/bwdev/kadfeb/xls/Accredo_Kadmon_Monthly_02282014.xls"); File outputFile = new File("output1.csv"); convertToXls(inputFile, outputFile); } 我认为HSSFWorkbook默认跳过空白单元格或缺less单元格。 尝试设置HSSFWorkbook对象的MissingCellPolicy。
可以在这里find为MissingCellPolicy设置的可能的值
使用行索引和col索引而不是Iterator。
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile)); workbook.setMissingCellPolicy(Row.CREATE_NULL_AS_BLANK); HSSFSheet sheet = workbook.getSheetAt(0); for(int rowIndex = sheet.getFirstRowNum(); rowIndex < sheet.getLastRowNum(); rowIndex++) { Cell cell=null; Row row = null; previousCell = -1; currentCell = 0; row = sheet.getRow(rowIndex); for(int colIndex=row.getFirstCellNum(); colIndex < row.getLastCellNum(); colIndex++) { cell = row.getCell(colIndex); currentCell = cell.getColumnIndex(); /* Cell processing starts here*/ } }
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.Iterator; import org.apache.commons.io.FilenameUtils; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; 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.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 FileInputStream fis = new FileInputStream(inputFile); Workbook workbook = null; String ext = FilenameUtils.getExtension(inputFile.toString()); if (ext.equalsIgnoreCase("xlsx")) { workbook = new XSSFWorkbook(fis); } else if (ext.equalsIgnoreCase("xls")) { workbook = new HSSFWorkbook(fis); } // Get first sheet from the workbook int numberOfSheets = workbook.getNumberOfSheets(); Row row; Cell cell; // Iterate through each rows from first sheet for (int i = 0; i < numberOfSheets; i++) { Sheet sheet = workbook.getSheetAt(0); Iterator<Row> rowIterator = sheet.iterator(); while (rowIterator.hasNext()) { row = rowIterator.next(); // For each row, iterate through each columns Iterator<Cell> 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 + ","); } } data.append('\n'); // appending new line after each row } } fos.write(data.toString().getBytes()); fos.close(); } catch (Exception ioe) { ioe.printStackTrace(); } } // testing the application public static void main(String[] args) { // int i=0; // reading file from desktop File inputFile = new File(".//src//test//resources//yourExcel.xls"); //provide your path // writing excel data to csv File outputFile = new File(".//src//test//resources//yourCSV.csv"); //provide your path xlsx(inputFile, outputFile); System.out.println("Conversion of " + inputFile + " to flat file: " + outputFile + " is completed"); } }
我replace了
while (cellIterator.hasNext()) { Cell cell = cellIterator.next();
同
for (int cn = 0; cn < row.getLastCellNum(); cn++) { Cell cell = row.getCell(cn, Row.CREATE_NULL_AS_BLANK);