POI cellIterator ignores empty cells. How to catch?
For the experienced:I have never dealt with Microsoft Excel files using java and have just started using the POI library to read data from Excel files. In the .xls file I get, there are cells that are found to be empty, although they aren't supposed to. So I have to catch these empty cells and treat them accordingly.
To learn how to catch these empty cells, I created a spreadsheet of Excel a line test and wrote the following class to try to catch empty cells.
The one line in the sheet has 5 columns as shown below. I entered < tt > ' 0934 < /tt > in column D with an apostrophe leader to make sure that it is stored as text.
A B C D E
---- ------- ----- ---- ---------
John (BLANK) 123.4 0923 4/21/2011public class ExcelTest {
public static void main(String[] args) throws IOException {
// The one-row test file:
String inputFilename = "c:\\test_data\\test_sheet.xls";
FileInputStream fis = new FileInputStream(inputFilename);
HSSFWorkbook workbook = new HSSFWorkbook(fis);
HSSFSheet worksheet = workbook.getSheetAt(0);
// Get the one row
HSSFRow theRow = worksheet.getRow(0);
// and create an iterator
Iterator cells = theRow.cellIterator();
int columnNo = 0;
// Go through the cells in the row:
while (cells.hasNext()) {
// Get the next cell:
HSSFCell cell = (HSSFCell)cells.next();
int cellType = cell.getCellType();
String cellTypeDesc = null;
String cellValue = null;
switch (cellType) {
case 0:
cellTypeDesc = "NUMERIC";
Double doubleValue = cell.getNumericCellValue();
cellValue = doubleValue.toString();
break;
case 1:
cellTypeDesc = "STRING";
cellValue = cell.getStringCellValue();
break;
case 2:
cellTypeDesc = "FORMULA";
cellValue = cell.getCellFormula();
break;
case 3:
cellTypeDesc = "BLANK";
cellValue = "BLANK";
break;
case 4:
cellTypeDesc = "BOOLEAN";
boolean booleanValue = cell.getBooleanCellValue();
cellValue = ""+booleanValue;
break;
case 5:
cellTypeDesc = "ERROR";
byte byteValue = cell.getErrorCellValue();
cellValue = ""+byteValue;
break;
}
System.out.println("Column " + ++columnNo + " has value " + cellValue + " of type " + cellTypeDesc);
}
}
}Column 1 has value John of type STRING
Column 2 has value 123.4 of type NUMERIC
Column 3 has value 0923 of type STRING
Column 4 has value 40654.0 of type NUMERICThank you very much for help!
Newman
Looking through the javadocs POI, because cellIterator() does not return empty cells, you can use the getCellNum() method to determine the position of the cell in the row. You should be able to use it to determine when a cell is ignored because being blank.
Tags: Java
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