Question

我编写了一个代码，该代码从一个输入excel文件中获取数据，并使用所需的组织编写新的输出文件。我遇到的问题是，当我打开Java文件时，只有for循环中最新的列才有数据。我已经通过在不同时间打破for循环来测试我的for循环是否错误。测试表明它确实在正确的列中写入了正确的数据。我不知道它为什么选择删除前一列。我是否缺少一行来保存我刚刚制作的单元格值以保存我正在处理的工作表上的数据？

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;

import org.apache.poi.ss.usermodel.SheetConditionalFormatting;
import org.apache.poi.ss.usermodel.ConditionalFormattingRule;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.ComparisonOperator;//compare two different values
import org.apache.poi.ss.usermodel.PatternFormatting;
import org.apache.poi.ss.usermodel.IndexedColors;


 import java.util.Iterator;
import java.io.*;
import javax.swing.JFileChooser;

public class Reorganizer 
{
public static void main(String[] args)
{
    /*File Chooser*/
    JFileChooser fileChooser = new JFileChooser();//lets user choose file
    int returnValue = fileChooser.showOpenDialog(null);//null bc we don't have parent classes, lets user choose through an open window

    if(returnValue == JFileChooser.APPROVE_OPTION)
    {
        try 
        {
            Workbook wb= new HSSFWorkbook(new FileInputStream(fileChooser.getSelectedFile()));//setting the input file as a workbook
            Sheet inputSheet = wb.getSheetAt(0);//the sheet from the input file

            Workbook wb1 = new HSSFWorkbook();//creating a new workbook to later be put into the output file
            Sheet outputSheet = wb1.createSheet("Sheet 1");//creates new sheet on the output excel file

            //first need something to find cell# of the file
            Row idRow = inputSheet.getRow(0);
            int cellCounter=0;
            for(Iterator<Cell> cit = idRow.cellIterator(); cit.hasNext();)//goes down the row, until there is nothing
            {                   
                Cell cell = cit.next();
                cellCounter++;
            }
            //finds the number of rows
            int rowCounter=0;
            for(Iterator<Row> rit = inputSheet.rowIterator();rit.hasNext();)//goes down the column, until there is nothing
            {                   
                Row row = rit.next();
                rowCounter++;
            }


            //The first row of the document should be the labeling process
            //Set the row(0) and the cells(9)
            Row labelRow = outputSheet.createRow(0);
            //for loop to make 9 cells with labels
            String[] cellValues = new String[]{"Chr","Pos","Olfr","Subfamily","Cluster","OP6u","OP6d","OP27u","OP27d"};
            for(int i=0; i<=9;i++)
            {
                Cell labelCells = labelRow.createCell(i);
                if(i<=8)
                {
                     labelCells.setCellValue(cellValues[i]);
                     for(Iterator<Cell> cit = idRow.cellIterator(); cit.hasNext(); )
                        {
                            Cell cell = cit.next();
                            cell.setCellType(Cell.CELL_TYPE_STRING);
                            if(cellValues[i].equals(cell.getStringCellValue()))
                            {
                                for(int j=1;j<rowCounter;j++)
                                {
                                    int cellnum = cell.getColumnIndex();
                                    Cell inputCell = inputSheet.getRow(j).getCell(cellnum);
                                    inputCell.setCellType(Cell.CELL_TYPE_STRING);
                                    String data = inputCell.getStringCellValue();
                                    Cell outputCell = outputSheet.createRow(j).createCell(i);
                                    outputCell.setCellValue(data);
                                    System.out.println(cellnum);//tells me where the input column was from
                                    System.out.println(i);////tells me what row cell I'm writing on
                                    System.out.println(j);//tells me what row number 
                                    System.out.println(data);//tells me the data being inputed into file
//used the above prints to find out what it was doing, 
//this is the code used to write the data


                                }
                            }

                        }
                } 
                else 
                {
                     labelCells.setCellValue("");
                }

            }

        FileOutputStream output = new FileOutputStream("Reorganized.xls");
        wb1.write(output);
        output.flush();
        output.close();
        }
        catch (FileNotFoundException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
        catch (IOException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }


    }

}

}

Answer 1

好像你的问题就在这里。当您调用createRow（）时，它将删除现有数据。

Cell outputCell = outputSheet.createRow(j).createCell(i);

您可以在填充数据之前预先创建所有行，也可以调用getRow（）来测试该行是否已存在。你需要这样的东西：

Row row = outputSheet.getRow(j);
if (row == null) {
    row = outputSheet.createRow(j);
}
Cell outputCell = row.createCell(i);

使用Apache POI编写excel文件，但FileOutput只包含一列

1 个答案: