I have just Extracted the cells from the excel sheet using Apache POI, everything is working fine. But whenever there is an empty cell, the very next right cell data is what I get as a output. But, if exists a value in the latter, the desired output is coming.
This is the logic I've written.
Iterator<Row> rowIterator=sheet.rowIterator();
while(rowIterator.hasNext())
{
ExtractedRowsString extRows=new ExtractedRowsString();
ArrayList<HSSFCell> list=new ArrayList<HSSFCell>();
HSSFRow row=(HSSFRow) rowIterator.next();
Iterator<Cell> cellIterator=row.cellIterator();
while(cellIterator.hasNext())
{
HSSFCell cell=(HSSFCell)cellIterator.next();
list.add(cell);
}
if(check)
{
addBean(list,extRows);
print(extRows);
}
check=true;
}
What may be the problem?
EDITED :
public static void addBean(ArrayList list,ExtractedRowsString extRows)
{
for(int i=0;i<list.size();i++)
{
switch(i)
{
case 0:
extRows.setSchool_success_id((list.get(i)).toString());
break;
case 1:
extRows.setPem_id( (list.get(i)).toString() );
break;
case 2:
extRows.setDistrict_code((list.get(i)).toString());
break;
case 3:
extRows.setDistrict((list.get(i)).toString());
break;
}
}
}
From the docs:
cellIterator
public java.util.Iterator cellIterator()
Specified by:
cellIterator in interface Row
Returns:
cell iterator of the physically
defined cells. Note that the 4th
element might well not be cell 4, as
the iterator will not return
un-defined (null) cells. Call
getCellNum() on the returned cells to
know which cell they are. As this only
ever works on physically defined
cells, the Row.MissingCellPolicy has
no effect.
In short, empty cells do not show up in the iterator so you always have to check which cell you got.
ArrayList does permit adding nulls. Also what is the addBean method doing (skipping nulls or empty strings perhaps?) Can you post a small working code that one can run ?
Related
I am using poi(v4.0.0) to import the excel document. But when I tried to get the next cell carModelCell, it always return null, this is my Java 8 code looks like:
public void verifyCar(Cell cell, int relativeRowIndex, Head head) {
if (cell.getRowIndex() > 0 && head.getFieldName().equals("car")) {
if (StringUtils.isBlank(cell.getStringCellValue())|| cell.getStringCellValue().equals("无车")) {
return;
}
Cell carModelCell = cell.getRow().getCell(cell.getColumnIndex() + 1);
if (carModelCell == null || StringUtils.isBlank(carModelCell.getStringCellValue())) {
SparkUserParseResult result = new SparkUserParseResult();
result.setSuccess(false);
UploadSparkUserDataListener.parseSuccess.set(result);
return;
}
}
}
I am tried to get row from Cell, and get the next cell value with the same row and do some check, but the next cell carModelCell always return null. I have already sure the next cell of current row have a value. why would this happen? what should I do to fix this problem? This code block was in CellStyleWriteHandler which extend AbstractCellStyleStrategy in easy excel (version 2.2.11):
public class CellStyleWriteHandler extends AbstractCellStyleStrategy {
#Override
protected void setContentCellStyle(Cell cell, Head head, Integer relativeRowIndex) {
impl(cell, head, relativeRowIndex);
}
}
I tried to get the last index num was 14, the current column index number was 13. the total column of my imported excel was 24, seems the easy excel did not pass the full column, is it possible to fix this problem? How to get the next cell of current row?
i also user poi to parse excel, i think problem in this line:
Cell carModelCell = cell.getRow().getCell(cell.getColumnIndex() + 1);
code above is error, becase cell can get from row,like:
Cell cell = sheetColumnRow.getRow()
one raw can cantain many Cell，but you can not get complete row from Cell, Parse row Cell value can not reverse; wish help you;
I'm getting a weird error while trying to read the Cell values through Apache POI in java:
System.out.println(row.getCell(13, Row.CREATE_NULL_AS_BLANK).getStringCellValue())
is always printing null, even after specifying the Missing policy as Row.CREATE_NULL_AS_BLANK.My writing logic to the Cell is :
public void writeCell( String value, Sheet sheet, int rowNum, int colNum)
{
Row row = sheet.getRow(rowNum);
if (row == null)
{
row = sheet.createRow(rowNum);
}
Cell cell = row.createCell(colNum, Cell.CELL_TYPE_STRING);
if (value == null)
{
return;
}
cell.setCellValue(value);
}
When I'm writing to Cell at colNum = 13 , the String value object is null. I'm not able to sort out this issue.
This line doesn't do what you seem to think it does:
System.out.println(row.getCell(13, Row.CREATE_NULL_AS_BLANK).getStringCellValue())
In effect, that's doing
Cell cell = row.getCell(13);
if (cell == null) { cell = row.createCell(13, Cell.CELL_TYPE_BLANK); }
So, if there is nothing in that cell, it creates it as an empty blank one
Then, you try doing:
cell.getStringCellValue()
This only works for String cells, and in the missing case you've told POI to give you a Blank new cell!
If you really just want a string value of a cell, use DataFormatter.formatCellValue(Cell) - that returns a String representation of your cell including formatting. Otherwise, check the type of your cell before trying to fetch the value!
The getStringCellValue() on the Cell interface would return "" if your code worked as supposed (setting the call blank).
Is it not possible that value for col id 13 is not null but "null"?
Is there a way to get the cell object or coordinate by the data the cell contains?
For example if the cell with coordinates (1;5) contains the string "FINDME", i'd like to do something like Workbook.GetCellByData("FINDME") and it should return the Cell object or (1;5).
I have found a code snippet on the Apache POI website that could be useful. I could just read the whole workbook and find the data with an IF-statement, but that's kind of dirty...
EDIT:
I have coded the "dirty" solution as follows:
public Cell getCellByContent(String data) {
for (Row row : wb.getSheetAt(0)) {
for (Cell cell : row) {
if (cell.getCellType() == Cell.CELL_TYPE_STRING){
System.out.println(String.format("Found String type at (%s,%s) and read: %s", row.getRowNum(), cell.getColumnIndex(), cell.getStringCellValue()));
if (cell.getStringCellValue() == data) { //HERE
return cell; //HERE
} //HERE
}
}
}
System.out.println("Can't find it bruh!");
return null;
For some reason it fails at the if-statement. Id like to get the Cell with the content "%title%".
Output:
Found String type at (0,0) and read: %title% <------ IT'S RIGHT HERE!
Found String type at (2,0) and read: Test Information
...
Can't find it bruh!
Does someone have an idea why this is not working?
To fix the dirty solution replace
if (cell.getStringCellValue() == data)
with
if (cell.getStringCellValue().equals(data))
I think I can help you. you just make two for() loops for rows and columns and then type Workbook.getCellValue(i,j) (i is the number of the row and j is the number of the column
I'm opening a Excel (xls) file in my Java Application with POI.
There are 30 Lines in this Excelfile.
I need to get the Value at ColumnIndex 9.
My code:
Workbook wb;
wb = WorkbookFactory.create(inp);
Sheet sheet = wb.getSheetAt(0);
for (Row row : sheet) {
if (row.getLastCellNum() >= 6) {
for (Cell cell : row) {
if(cell.getColumnIndex == 9) {
//do something
}
}
}
}
Every Row in Excel has Values in Columns 1-14.
My problem is, only some Values are recognized. I wrote the same value in every cell in ColumnIndex 9 (10th Column in my Excel sheet), but the Problem is still the same.
What could cause this problem?
Make sure you set the same Date format for all cells in column (select column and set format explicity) And i belive using DataUtil class to get data is more appropriate, than call cell.getDateCellValue().
POI uses 0 based counting for columns. So, if you want the 9th Column, you need to fetch the cell with index 8, not 9. It looks like you're checking for column with index 9, so are one column out.
If you're not sure about 0 based indexing, then the safest thing is to use the CellReference class to help you. This will translate between Excel style references, eg A1, and POI style 0-based offsets eg 0,0. Use something like:
CellReference ref = new CellReference("I10");
Row r = sheet.getRow(ref.getRow());
if (r == null) {
// That row is empty
} else {
Cell c = r.getCell(ref.getCol());
// c is now the cell at I10
}
Seems to be a Problem with the excel document(s).
Converting them to csv and then back to xls solves the problem.
I've been using Java POI for some time now, but have encountered a new problem, and I'm wondering if anyone has found a solution.
When you read a spreadsheet, you need to know the type of cell in order to use the proper read method.
So you get the cell type, then call the appropriate read method to get the cell's contents.
This works for all cells except for the FORMULA cell, where the value is a number. If it's text, you can read it just fine. But if the resulting value is a number, then all you get from the cell is a blank string.
I've been through the javadocs for POI, and am using the correct data type (HSSFRichTextString), but still no joy.
Anyone have a solution?
P.S. this behavior of POI does bug me as there should be a default cell.toString() method that would return the string representation of ANY cell type, say defaulting to the cell's value property. (sort of like the paste-special where you can choose "value").
PPS: As asked - I'm using Java 6 (1.6.0_06) and poi-3.0.2-FINAL-20080204.jar
FileInputStream fis = new FileInputStream("c:/temp/test.xls");
Workbook wb = new HSSFWorkbook(fis); //or new XSSFWorkbook("c:/temp/test.xls")
Sheet sheet = wb.getSheetAt(0);
FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
// suppose your formula is in B3
CellReference cellReference = new CellReference("B3");
Row row = sheet.getRow(cellReference.getRow());
Cell cell = row.getCell(cellReference.getCol());
CellValue cellValue = evaluator.evaluate(cell);
switch (cellValue.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
System.out.println(cellValue.getBooleanValue());
break;
case Cell.CELL_TYPE_NUMERIC:
System.out.println(cellValue.getNumberValue());
break;
case Cell.CELL_TYPE_STRING:
System.out.println(cellValue.getStringValue());
break;
case Cell.CELL_TYPE_BLANK:
break;
case Cell.CELL_TYPE_ERROR:
break;
// CELL_TYPE_FORMULA will never happen
case Cell.CELL_TYPE_FORMULA:
break;
}
Copied shamelessly from here
Just convert that cell into text .. using copy-"paste special" ... I did it as follows ....
Read from Point # 2 at :
http://www.asif-shahzad.com/2010/12/how-to-read-numbers-as-string-value-in.html
If POI doesn't work out for you, try Andy Khan's JExcel. I prefer it.
An alternative to using createFormulaEvaluator is to use SetCellType(CellType.STRING) and then access StringCellValue. I ran into problems using a formula evaluator (using NPOI) when it contains the WORKDAY() function.