I’m trying to find a blank value in excel (xlsx) sheet and replace with some string like “ENTER VALUE” using my program with Apache POI library as below
I’m able to read and identify blank/null values in excel sheet but couldnt insert any value into those cells
public static void main(String args[]) throws IOException, InvalidFormatException
{
FileInputStream inputFile = new FileInputStream("//Users//suk//Documents/tes//testexcel.xlsx");
//now initializing the Workbook with this inputFie
// Create workbook using WorkbookFactory util method
Workbook wb = WorkbookFactory.create(inputFile);
// creating helper for writing cells
CreationHelper createHelper = wb.getCreationHelper();
// setting the workbook to handle null
wb.setMissingCellPolicy(Row.CREATE_NULL_AS_BLANK);
Sheet sheet = wb.getSheetAt(0);
for (Row row : sheet) {
int lastCellNo =row.getLastCellNum();
int firstCellNo=row.getFirstCellNum();
int rowNo =row.getRowNum();
System.out.println(" row number = "+rowNo);
System.out.println(" last cell no = "+lastCellNo);
for(int i=firstCellNo;i<lastCellNo;i++){
System.out.println("************");
Cell cell = row.getCell(i);
int colIndex =cell.getColumnIndex();
if(cell==null)
{
System.out.println(" The Cell:"+colIndex+" for row "+row.getRowNum()+" is NULL");
}
System.out.println(" column index = "+colIndex);
int cellType = cell.getCellType();
System.out.println(" cell type ="+cellType);
// writing a switch case statement
switch(cellType)
{
case 0:
{
double numValue = cell.getNumericCellValue();
//System.out.println(numValue);
break;
}
case 1:
{
String cellString = cell.getStringCellValue();
System.out.println("----String value = "+cellString+"---String length ="+cellString.length());
// here checking null consition
/* if(cellString == null || cellString.equalsIgnoreCase("") || cellString.length()<=0 || cellString.equalsIgnoreCase(" "))
{
// here creating the cell value after last cell
} */
break;
}
case 4:
{
boolean bolValue =cell.getBooleanCellValue();
//System.out.println(bolValue);
break;
}
// for case of blank cell
case 3:
{
//int lastCellPlus =lastCellNo+1;
//System.out.println("last+1 column ="+lastCellPlus);
//row.createCell(lastCellPlus).setCellValue(" NULL VALUE..PLEASE ENTER VALUE ");
System.out.println(" cell details = "+cell.getColumnIndex()+" row details ="+row.getRowNum());
cell.setCellValue(createHelper.createRichTextString("ENTER VALUE"));
System.out.println(" Sucessfully written error");
break;
}
default:
System.out.println(" unknown format");
break;
}// switch
} // row and cell iterator
}
}
}
Below is the bit of code by which im identifying its Blank/Null value and trying to insert String but its not writing to that cell
case 3:
{
//int lastCellPlus =lastCellNo+1;
//System.out.println("last+1 column ="+lastCellPlus);
//row.createCell(lastCellPlus).setCellValue(" NULL VALUE..PLEASE ENTER VALUE ");
System.out.println(" cell details = "+cell.getColumnIndex()+" row details ="+row.getRowNum());
cell.setCellValue(createHelper.createRichTextString("ENTER VALUE"));
System.out.println(" Sucessfully written error");
break;
}
}