Apache POI shiftRows损坏文件并删除内容

Question

I want to fill table a template excel file. I want to insert rows and fill them. I used java Apache POI library to access excel files. At first, I created a new file and filled column A from row 1 to 10 with 1..10 numbers and saved the file. Then I read the file and tried to insert a single empty row with a sheet.shiftRows() method. I tried below code but output file has a problem in the opening (reading) and rows 5,6,7 are empty and move has not occurred.

InputStream inputStream = new FileInputStream("TestIn-1.xlsx");
Workbook workbookIn = new XSSFWorkbook(inputStream);
Sheet sheetIn = workbookIn.getSheet("Sheet1");

sheetIn.shiftRows(4,5,1);

OutputStream outputStream = new FileOutputStream("TestOut.xlsx");
workbookIn.write(outputStream);
outputStream.close();

Answer 1

Your shiftRows tries shifting rows between row 5 (index 4) and row 6 (index 5) one row down. But what about row 7, 8, 9 and 10? You needs shifting rows between row 5 and last row one row down if the need is getting a new empty row 5.

Using apache poi version 3.17 this is as simple as:

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;

import java.io.FileInputStream;
import java.io.FileOutputStream;

class ExcelReadShiftRowsAndWrite {

 public static void main(String[] args) throws Exception {
  //String fileIn= "TestIn.xls";
  //String fileOut= "TestOut.xls";
  String fileIn= "TestIn.xlsx";
  String fileOut= "TestOut.xlsx";

  try (Workbook workbook = WorkbookFactory.create(new FileInputStream(fileIn));
       FileOutputStream out = new FileOutputStream(fileOut)) {

   Sheet sheet = workbook.getSheet("Sheet1");

   sheet.shiftRows(4, sheet.getLastRowNum(), 1); //shifts rows between row 5 (index 4) and last row one row down

   workbook.write(out);
  } 
 }
}

But apache poi versions greater than 3.17 , also 4.1.0 , have a bug in shiftRows using XSSF . There, after shifting, the references in the cells remain old instead being adjusted to the new rows. For example the references A5 , A6 , ... remain after shifting down instead of getting adjusted to A6 , A7 , ...

So this bug must be corrected:

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;

import java.io.FileInputStream;
import java.io.FileOutputStream;

class ExcelReadShiftRowsAndWrite {

 public static void main(String[] args) throws Exception {
  //String fileIn= "TestIn.xls";
  //String fileOut= "TestOut.xls";
  String fileIn= "TestIn.xlsx";
  String fileOut= "TestOut.xlsx";

  try (Workbook workbook = WorkbookFactory.create(new FileInputStream(fileIn));
       FileOutputStream out = new FileOutputStream(fileOut)) {

   Sheet sheet = workbook.getSheet("Sheet1");

   sheet.shiftRows(4, sheet.getLastRowNum(), 1); //shifts rows between row 5 (index 4) and last row one row down

   if (sheet instanceof XSSFSheet) {  
    XSSFSheet xSSFSheet = (XSSFSheet)sheet;
    // correcting bug that shiftRows does not adjusting references of the cells
    // if row 3 is shifted down, then reference in the cells remain r="A3", r="B3", ...
    // they must be adjusted to the new row thoug: r="A4", r="B4", ...
    // apache poi 3.17 has done this properly but had have other bugs in shiftRows.
    for (int r = xSSFSheet.getFirstRowNum(); r < sheet.getLastRowNum() + 1; r++) {
     XSSFRow row = xSSFSheet.getRow(r); 
     if (row != null) {
      long rRef = row.getCTRow().getR();
      for (Cell cell : row) {
       String cRef = ((XSSFCell)cell).getCTCell().getR();
       ((XSSFCell)cell).getCTCell().setR(cRef.replaceAll("[0-9]", "") + rRef);
      }
     }
    }
    // end correcting bug
   }

   workbook.write(out);
  } 
 }
}