Apache POI shiftRows损坏文件并删除内容

小编典典

Apache POI shiftRows损坏文件并删除内容

java

我想填写表格模板excel文件。我想插入行并填充它们。我使用Java Apache
POI库访问excel文件。首先，我创建了一个新文件，并在第1行至第10列的A列中填充了1..10数字并保存了该文件。然后，我读取了文件并尝试使用sheet.shiftRows()方法插入单个空行。我尝试了下面的代码，但输出文件在打开（读取）时出现问题，第5、6、7行为空，并且未发生移动。

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();

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2020-11-23

共1个答案

小编典典

您shiftRows尝试将第5行（索引4）和第6行（索引5）之间的行向下移动一行。但是第7、8、9和10行呢？如果需要获取新的空行5，则需要在第5行和最后一行之间向下移动一行。

使用apache poi版本，3.17这很简单：

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);
  } 
 }
}

但是apache poi大于的版本在使用中3.17也4.1.0有错误。在那里，移位后，单元格中的引用保持旧状态，而不是被调整为新的行。例如，参考文献，…保持向下移位，而不是得到调整后，…shiftRows``XSSF``A5``A6``A6``A7

因此，必须更正此错误：

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);
  } 
 }
}

2020-11-23