Apache POI shiftRows损坏文件并删除内容 [英] Apache POI shiftRows corrupts file and deletes content

问题描述

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，但输出文件的开头(读取)有问题，第5、6、7行为空，并且未发生移动.

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();

推荐答案

您的shiftRows尝试在第5行(索引4)和第6行(索引5)之间向下移动一行.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.

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.

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);
  } 
 }
}

但是大于3.17的apache poi版本(也是4.1.0)在使用XSSF的shiftRows中存在错误.在那里，移动后，单元格中的引用仍然是旧的，而不是被调整为新的行.例如，引用A5，A6，...下移后仍保留，而不是调整为A6，A7，...

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, ...

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);
  } 
 }
}

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