How to determine empty row?

问题:

How I can determine empty rows in .xls documents using Apache POI?

回答1:

I'm using the following method in my POI project and it's working well. It is a variation of zeller's solution.

public static boolean isRowEmpty(Row row) {
    for (int c = row.getFirstCellNum(); c < row.getLastCellNum(); c++) {
        Cell cell = row.getCell(c);
        if (cell != null && cell.getCellType() != Cell.CELL_TYPE_BLANK)
            return false;
    }
    return true;
}

回答2:

The row iterator returns only rows that contain data, however if they are completely empty then iterating by row index, getRow(index) returns null

Solution:

Up to POI version 3.14 (thanks to Sergii Lisnychyi):

private boolean checkIfRowIsEmpty(Row row) {
    if (row == null) {
        return true;
    }
    if (row.getLastCellNum() <= 0) {
        return true;
    }
    for (int cellNum = row.getFirstCellNum(); cellNum < row.getLastCellNum(); cellNum++) {
        Cell cell = row.getCell(cellNum);
        if (cell != null && cell.getCellType() != Cell.CELL_TYPE_BLANK && StringUtils.isNotBlank(cell.toString())) {
            return false;
        }
    }
    return true;
}

From POI version 3.15 to 4.2 (int getCellType() is deprecated):

    private boolean checkIfRowIsEmpty(Row row) {
    if (row == null) {
        return true;
    }
    if (row.getLastCellNum() <= 0) {
        return true;
    }
    for (int cellNum = row.getFirstCellNum(); cellNum < row.getLastCellNum(); cellNum++) {
        Cell cell = row.getCell(cellNum);
        if (cell != null && cell.getCellTypeEnum() != CellType.BLANK && StringUtils.isNotBlank(cell.toString())) {
            return false;
        }
    }
    return true;
}

From POI version 4 (CellTypeEnum getCellTypeEnum() will return the Enum not int):

private boolean checkIfRowIsEmpty(Row row) {
    if (row == null) {
        return true;
    }
    if (row.getLastCellNum() <= 0) {
        return true;
    }
    for (int cellNum = row.getFirstCellNum(); cellNum < row.getLastCellNum(); cellNum++) {
        Cell cell = row.getCell(cellNum);
        if (cell != null && cell.getCellTypeEnum() != CellType.BLANK && StringUtils.isNotBlank(cell.toString())) {
            return false;
        }
    }
    return true;
}

回答3:

You have to iterate through all cells in the row and check if they are all empty. I don't know any other solution...

 short c;
 for (c = lastRow.getFirstCellNum(); c <= lastRow.getLastCellNum(); c++) {
     cell = lastRow.getCell(c);
     if (cell != null && lastRow.getCell(c).getCellType() != HSSFCell.CELL_TYPE_BLANK) {
          nonBlankRowFound = true;
     }
 }

The code is from here

回答4:

Yes, but if in some row we will have in some cell = " " and empty values in another cells. This method will be work better:

  boolean isEmptyRow(Row row){
     boolean isEmptyRow = true;
         for(int cellNum = row.getFirstCellNum(); cellNum < row.getLastCellNum(); cellNum++){
            Cell cell = row.getCell(cellNum);
            if(cell != null && cell.getCellType() != Cell.CELL_TYPE_BLANK && StringUtils.isNotBlank(cell.toString())){
            isEmptyRow = false;
            }    
         }
     return isEmptyRow;
   }

回答5:

Assuming you want to check if row n is empty, remembering that rows in Apache POI are zero based not one based, you'd want something like:

 Row r = sheet.getRow(n-1); // 2nd row = row 1
 boolean hasData = true;

 if (r == null) {
    // Row has never been used
    hasData = false;
 } else {
    // Check to see if all cells in the row are blank (empty)
    hasData = false;
    for (Cell c : r) {
       if (c.getCellType() != Cell.CELL_TYPE_BLANK) {
         hasData = true;
         break;
       }
    }
 }

回答6:

try using if(iterator.hasNext)

Row nextRow = null;
Cell nextCell = null;
Iterator<Row> iterator = firstSheet.rowIterator();
if(iterator.hasNext) {
    return true;
}
else {
    return false;
}

回答7:

If you are using apache-poi [4+]:

Then the below method works for you. As the other methods suggested did not work for me, I had to do it this way.

public static boolean isRowEmpty(Row row) {
    boolean isEmpty = true;
    DataFormatter dataFormatter = new DataFormatter();
    if(row != null) {
        for(Cell cell: row) {
            if(dataFormatter.formatCellValue(cell).trim().length() > 0) {
                isEmpty = false;
                break;
            }
        }
    }
    return isEmpty;
}

The method dataFormatter.formatCellValue(cell) would return "", an empty / ZERO length string when the cell is either null or BLANK.

The import statements for your reference:

import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Cell;

Hope this helps!

回答8:

get the instance of CellReference and use formatAsString() on the instance. compare it with an empty String

`

if("".equals(cellRef.formatAsString())){
     System.out.println("this is an empty cell");
   }else{
      System.out.println("Cell value : "+cellRef.formatAsString());
   }

` Reference : http://www.javabeat.net/2007/10/apache-poi-reading-excel-sheet-using-java/