Can't read Excel 2010 file with Apache POI. First Row number is -1

Question

I am trying the this testfile with the Apache POI API (current version 3-10-FINAL). The following test code

import java.io.FileInputStream;
import org.apach         


        

Answer 1

The testfile.xlsx is created with "SpreadsheetGear 7.1.1.120". Open the XLSX file with a software which can deal with ZIP archives and look into /xl/workbook.xml to see that. In the worksheets/sheet?.xml files is to notice that all row elements are without row numbers. If I put a row number in the first row-tag like <row r="1"> then apache POI can read this row.

If it comes to the question, who is to blame for this, then the answer is definitely both Apache Poi and SpreadsheetGear ;-). Apache POI because the attribute r in the row element is optional. But SpreadsheetGear also because there is no reason not to use the r attribute if Excel itself does it ever.

If you cannot get the testfile.xlsx in a format which can Apache POI read directly, then you must work with the underlying objects. The following works with your testfile.xlsx:

import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.*;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.InputStream;

import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorksheet;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTSheetData;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTRow;

import java.util.List;

class Testfile {

 public static void main(String[] args) {
  try {

   InputStream inp = new FileInputStream("testfile.xlsx");
   Workbook wb = WorkbookFactory.create(inp);

   Sheet sheet = wb.getSheetAt(0);

   System.out.println(sheet.getFirstRowNum());

   CTWorksheet ctWorksheet = ((XSSFSheet)sheet).getCTWorksheet();

   CTSheetData ctSheetData = ctWorksheet.getSheetData();

   List<CTRow> ctRowList = ctSheetData.getRowList();

   Row row = null;
   Cell[] cell = new Cell[2];

   for (CTRow ctRow : ctRowList) {
    row = new MyRow(ctRow, (XSSFSheet)sheet);
    cell[0] = row.getCell(0);
    cell[1] = row.getCell(1);
    if (cell[0] != null && cell[1] != null && cell[0].toString() != "" && cell[1].toString() != "") 
       System.out.println(cell[0].toString()+"\t"+cell[1].toString());
   }

  } catch (InvalidFormatException ifex) {
  } catch (FileNotFoundException fnfex) {
  } catch (IOException ioex) {
  }
 }
}

class MyRow extends XSSFRow {
 MyRow(org.openxmlformats.schemas.spreadsheetml.x2006.main.CTRow row, XSSFSheet sheet) {
  super(row, sheet);
 }
}

I have used:

• org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorksheet
• org.openxmlformats.schemas.spreadsheetml.x2006.main.CTSheetData
• org.openxmlformats.schemas.spreadsheetml.x2006.main.CTRow

Which are part of the Apache POI Binary Distribution poi-bin-3.10.1-20140818 and there are within poi-ooxml-schemas-3.10.1-20140818.jar

For a documentation see http://grepcode.com/snapshot/repo1.maven.org/maven2/org.apache.poi/ooxml-schemas/1.1/

And I have extend XSSFRow, because we can't use the XSSFRow constructor directly since it has protected access.