Question

我将.xls转换为.csv文件，代码工作正常。但最终输出的最后一个逗号将出现，我不想在我的代码中使用逗号，例如我的输出看起来像ss，dd，ee ，但我不需要最后一个逗号，如何纠正它。

在这里输入代码

 import java.io.*;

import java.util.Iterator;

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;


class convert {

     static void convertToXls(File inputFile, File outputFile)
    {
      // For storing data into CSV files
       StringBuffer cellDData = new StringBuffer();
       String cellDDataString=null;
      try
        {
          FileOutputStream fos = new FileOutputStream(outputFile);

          // Get the workbook instance for XLS file
           HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(inputFile));
           // Get first sheet from the workbook
           HSSFSheet sheet = workbook.getSheetAt(0);
           Cell cell;
           Row row;

          // Iterate through each rows from first sheet
           Iterator<Row> rowIterator = sheet.iterator();
            while (rowIterator.hasNext())
            {
             row = rowIterator.next();

            // For each row, iterate through each columns
              System.out.println("row"+row);

               Iterator<Cell> cellIterator = row.cellIterator();
               while (cellIterator.hasNext())
               {
                  cell = cellIterator.next();
                  System.out.println("cell" +cell);
                  switch (cell.getCellType())
                 {

                        case Cell.CELL_TYPE_BOOLEAN:
                        cellDData.append(cell.getBooleanCellValue() + ",");
                        break;

                       case Cell.CELL_TYPE_NUMERIC:
                       cellDData.append(cell.getNumericCellValue() + ",");
                       break;

                   case Cell.CELL_TYPE_STRING:
                   cellDData.append(cell.getStringCellValue() + ",");
                   System.out.println(cell.getStringCellValue());
                   break;

                  case Cell.CELL_TYPE_BLANK:
                  cellDData.append("" + ",");
                   break;

                 default:
                cellDData.append(cell + ",");

                }
           }
       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)
    {



    File inputFile = new File("Book1.xls");

    File outputFile = new File("output1.csv");

    convertToXls(inputFile, outputFile);

    }
    }

Answer 1

只需为逗号做一个预构建，并将其添加到追加状态 String szMyComma = ""; while (cellIterator.hasNext()) { cell = cellIterator.next(); .... cellDData.append(szMyComma + cell.getStringCellValue()); .... szMyComma = ","; }

Answer 2

如果cellIterator.hasNext()为真，则只附加逗号

Answer 3

试试这个

cellDData.replace(cellDData.length() - 1, cellDData.length(), "");

在行

之前

cellDData.append("\n");

Answer 4

import java.io.*;
import jxl.*;//libary file jxl-2.6.jar need to download
import java.util.*;

class  ConvertCSV
{
  public static void main(String[] args) 
  {
    try
    {
      //File to store data in form of CSV
      File f = new File("E:\\rajju.csv");

      OutputStream os = (OutputStream)new FileOutputStream(f);
      String encoding = "UTF8";
      OutputStreamWriter osw = new OutputStreamWriter(os, encoding);
      BufferedWriter bw = new BufferedWriter(osw);

      //Excel document to be imported
      String filename = "D:\\RAJAT\\tds.xls";
      WorkbookSettings ws = new WorkbookSettings();
      ws.setLocale(new Locale("en", "EN"));
      Workbook w = Workbook.getWorkbook(new File(filename),ws);

      // Gets the sheets from workbook
      for (int sheet = 0; sheet < w.getNumberOfSheets(); sheet++)
      {
        Sheet s = w.getSheet(sheet);

        bw.write(s.getName());
        bw.newLine();

        Cell[] row = null;

        // Gets the cells from sheet
        for (int i = 0 ; i < s.getRows() ; i++)
        {
          row = s.getRow(i);

          if (row.length > 0)
          {
            bw.write(row[0].getContents());
            for (int j = 1; j < row.length; j++)
            {
              bw.write(',');
              bw.write(row[j].getContents());
            }
          }
          bw.newLine();
        }
      }
      bw.flush();
      bw.close();
    }
    catch (UnsupportedEncodingException e)
    {
      System.err.println(e.toString());
    }
    catch (IOException e)
    {
      System.err.println(e.toString());
    }
    catch (Exception e)
    {
      System.err.println(e.toString());
    }
  }
}

Answer 5

在你的第二个while循环中，你总是调用某种形式的cellDData.append（cell +“，”）;这是导致逗号总是被添加到最后的原因。

您可以在追加之前执行此操作：

if(cellIterator.hasNext()) {
   cellDData.append(value + ",");
} else {
   cellDData.append(value);
}

不幸的是，每次在switch语句中调用cellDData.append时都必须进行此检查。更清晰的解决方案可能是将您的值存储为Object，然后在switch语句之后调用cellDData.append。但是，在将值存储为Object之前，应该测试它是否可以按预期的方式工作。

Answer 6

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);

            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);
            }

            int numberOfSheets = workbook.getNumberOfSheets();

            Row row;
            Cell cell;

            for (int i = 0; i < numberOfSheets; i++) {
                Sheet sheet = workbook.getSheetAt(0);
                Iterator<Row> rowIterator = sheet.iterator();

                while (rowIterator.hasNext()) {
                    row = rowIterator.next();

                    short firstCell = row.getFirstCellNum();
                    short lastCell = row.getLastCellNum();

                    String DELIMITER = "";

                    for(int j = firstCell; j<lastCell; j++){
                        cell = row.getCell(j);
                        if(cell==null){
                            data.append(DELIMITER);

                        }else {
                            switch (cell.getCellType()) {
                                case Cell.CELL_TYPE_BOOLEAN:
                                    data.append(DELIMITER + cell.getBooleanCellValue() );

                                    break;
                                case Cell.CELL_TYPE_NUMERIC:
                                    data.append(DELIMITER + cell.getNumericCellValue() );

                                    break;
                                case Cell.CELL_TYPE_STRING:
                                    data.append(DELIMITER + cell.getStringCellValue());
                                    break;

                                case Cell.CELL_TYPE_BLANK:
                                    data.append(DELIMITER );
                                    break;

                                default:
                                    data.append(DELIMITER + cell);
                            }
                        }
                        DELIMITER=",";
                    }
                    data.append('\n'); //
                }
            }
            fos.write(data.toString().getBytes());
            fos.close();

        } catch (Exception ioe) {
            ioe.printStackTrace();
        }
    }
}

将.xls转换为.csv java

6 个答案: