Java - Excel read multiple row data

Java - Excel read multiple row data - java

I need to read excel file which more than 300 rows. I need to extract value from particular cell only.
Code
Workbook workbook = Workbook.getWorkbook(new File(excelFile));
Sheet sheet = workbook.getSheet(0);
Cell emp_name = sheet.getCell(1,2);
Cell emp_dpt = sheet.getCell(2,2);
Cell emp_pdpt = sheet.getCell(3,2);
Cell emp_no = sheet.getCell(4,2);
Cell emp_desn = sheet.getCell(5,2);
Cell emp_dj = sheet.getCell(6,2);
Cell emp_lvl = sheet.getCell(7,2);
Cell emp_eval = sheet.getCell(8,2);
String name = emp_name.getContents();
String dpartment = emp_dpt.getContents();
String pre_department = emp_pdpt.getContents();
String employee_no = emp_no.getContents();
String designation = emp_desn.getContents();
String datejoined = emp_dj.getContents();
String evalution = emp_eval.getContents();
System.out.println(name);
System.out.println(dpartment);
System.out.println(pre_department);
System.out.println(employee_no);
System.out.println(designation);
System.out.println(datejoined);
System.out.println(evalution);
Above code helps me to fetch data from the excel but only one value extracted. How do I fetch all the data from excel.

Do it in a loop
When you say , sheet.getCell(1,2), you read the cell with column 1 and row 2.
Support if you want to read , column 1 and row 3, then do this sheet.getCell(1,3);
sheet.getRows() ->Returns the number of rows in this sheet
pseudo code:
for (int rowNum = 5; rowNum < sheet.getRows(); rowNum++) {
int column = 4;
sheet.getCell(column ++, rowNum).getContents(); //read 4th column and 5th row into a variable or object as per your logic;
sheet.getCell(column ++, rowNum).getContents(); //read 5th column and 5th row;
......
}

you can use iterator that allows you to read each and every cell
see example here
Iterator<Row> rowIterator = sheet.iterator();
while(rowIterator.hasNext()) {
Row row = rowIterator.next();
//For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
while(cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch(cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
System.out.print(cell.getBooleanCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_NUMERIC:
System.out.print(cell.getNumericCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "\t\t");
break;
}
}

Related

How to read contents of Excel sheet and storing it in a map with column1 as key, and the remaining columns as values

I have an excel sheet which looks like this :
Col_1 | Col_2| Col_3 | Col_4
A | B | C | D
A1 | B1 | C1 | D1
How to read this excel and store the values in a map with A as key, and B,C,D as values for that key.
Please find my codes below, which is not working as expected.
while (rowIterator.hasNext())
{
ArrayList<String> columnlist = new ArrayList<String>();
List excelValues = new ArrayList();
String key = StringUtils.EMPTY;
Row row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext())
{
Cell cell = cellIterator.next();
if(row.getRowNum() > 0)
{
if(cell.getColumnIndex()==0){
key = StringUtils.upperCase(cell.getStringCellValue());
}
else if(cell.getColumnIndex()==1)
{
tempPar = cell.getStringCellValue();
excelValues.add(tempPar);
}
if(tempPar.equalsIgnoreCase("Include")){
if(cell.getColumnIndex()==2)
{
// Responsible for reading comma separated values from cell in excel sheet.
StringTokenizer str= new StringTokenizer(cell.getStringCellValue(),COMMA);
while (str.hasMoreElements()) {
columnlist.add(StringUtils.upperCase(str.nextElement().toString()));
}
excelValues.add(columnlist.equals("") ? "" : columnlist);
}
else if(cell.getColumnIndex()==3){
ignorePK = cell.getStringCellValue();
ignorePK.add(cell.getStringCellValue());
excelValues.add(ignorePK);
}
}
map.put(key, excelValues);
}

I have written the code to read excel and store it to database using Apache Poi . You can refer it out and modify your own code.
try {
ExcelController ex = new ExcelController();
File f1 = ex.convert(file);
// FileInputStream file = new FileInputStream(new File("E://Imp/Details.xlsx"));
XSSFWorkbook workbook = new XSSFWorkbook(f1);
XSSFSheet sheet = workbook.getSheetAt(0);
Iterator<Row> rowIterator = sheet.iterator();
rowIterator.next();
// while (rowIterator.hasNext()) {
for(int i=1;i<=51;i++){
Row row = rowIterator.next();
//For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
// System.out.println("cell.getStringCellValue().length() "+cell.getStringCellValue().length());
// if( cell.getStringCellValue().length()>0){
List list = new ArrayList();
// This will change all Cell Types to String
cell.setCellType(Cell.CELL_TYPE_STRING);
switch (cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
String bstring = "" + cell.getBooleanCellValue();
list.add(cell.getBooleanCellValue());
System.out.println("boolean===>>>" + cell.getBooleanCellValue() + "\t");
break;
case Cell.CELL_TYPE_NUMERIC:
String Nstring = "" + cell.getNumericCellValue();
list.add(Nstring);
break;
case Cell.CELL_TYPE_STRING:
list.add(cell.getStringCellValue());
break;
}
// }else {
// break;
// }
}
After you get the values over there just push it to the Map you have created.

while reading excel sheet in java it tends to skip one cell value and auto populate it with next colomn

I am trying to read excel file cell by cell.The problem i am facing is ,my program skip one cell value while reading the excel file. Below is the code.
private void ReadExcel {
try
{
FileInputStream file = new FileInputStream(new File("C:\\Users\\Desktop\\abc.xlsx"));
XSSFWorkbook workbook = new XSSFWorkbook(file);
//Create a blank sheet
XSSFSheet spreadsheet = workbook.getSheetAt(0);
//Create row object
HashMap<Integer,List> hm = new HashMap<Integer,List>();
Integer index = 0;
//This data needs to be written (Object[])
Iterator<Row> rowIterator = spreadsheet.iterator();
while (rowIterator.hasNext())
{
List cellDataList = new ArrayList();
Row row = rowIterator.next();
//For each row, iterate through all the columns
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext())
{
Cell cell = cellIterator.next();
switch (cell.getCellType())
{
case Cell.CELL_TYPE_NUMERIC:
if (DateUtil.isCellDateFormatted(cell)) {
//System.out.println(cell.getDateCellValue());
cellDataList.add(cell.getDateCellValue());
} else {
//System.out.println(cell.getNumericCellValue());
cellDataList.add(cell.getNumericCellValue());
}
break;
case Cell.CELL_TYPE_STRING:
//System.out.print(cell.getStringCellValue() + "\t");
cellDataList.add(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BLANK:
//System.out.println(cell.getStringCellValue() + "\t");
cellDataList.add(cell.getStringCellValue());
}
}
hm.put(index, cellDataList);
System.out.println("Size of hashmap is " +hm.size());
List al =hm.get(index);
System.out.println("List Size is " +al.size());
for(int i = 0;i<al.size();i++)
{
//System.out.println(" " +al.get(i));
}
System.out.println();
index++;
System.out.println("");
}
}
catch(Exception e)
{
e.printStackTrace();
System.out.println("Exception " +e);
}
}
Input data file i am passing to method is
I shared the input file screen shot. The problem i am facing is , i am able to read all cell value of first row and get the size of 4 but when i read second row , value of coloumn "D" is getting skip and getting size of 3. I dont why its skip the second row "D" Coloumn.

use normal for instead
do something like this
Row oRow = sheet.createRow(rowCounter);
for (short cell = 0; cell < row.getLastCellNum(); cell++) {
System.out.println("Reading Cell number: "+cell);
Cell cell0 = oRow.createCell(cell);
cell0.setCellValue(row.getCell(cell).toString());
}

Get the no of columns in excel [duplicate]

This question already has answers here:
get number of columns of a particular row in given excel using Java
(3 answers)
Closed 8 years ago.
In my java application I am trying to convert excel to pdf using apache-poi.In my excel file,the number of columns are different in some rows.First and second rows contain one column,remaining rows contains 8 columns.Here is my code
while (rowIterator.hasNext()) {
Row row = rowIterator.next();
int cellNumber = 0;
if (flag) {
table = new PdfPTable(row.getLastCellNum());
flag = false;
}
// For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
if (temp == 0) {
numberOfColumns = row.getLastCellNum();
PdfPCell c1 = new PdfPCell(new Phrase(
cell.getStringCellValue()));
c1.setHorizontalAlignment(Element.ALIGN_CENTER);
table.addCell(c1);
table.setHeaderRows(1);
}else{
cellNumber =checkEmptyCellAndAddCellContentToPDFTable(cellNumber,cell,table);
}
cellNumber++;
break;
case Cell.CELL_TYPE_NUMERIC:
cellNumber =checkEmptyCellAndAddCellContentToPDFTable(cellNumber,cell,table);
cellNumber++;
break;
}
}
temp = 1;
if(numberOfColumns != cellNumber){
for(int i=0;i<(numberOfColumns-cellNumber);i++){
table.addCell(" ");
}
}
}
So when I execute this,I will get the pdf file with only one column.But I want same as my excel format.How can I achieve this in my code dynamically(I have to apply this logic for other excel files also)?

You can use this approach to iterate each cell of every row .
Sheet sheet = workbook.getSheetAt(0);
//Iterate through each rows from first sheet
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()) {
Row row = rowIterator.next();
if(isRowEmpty(row)){
System.out.println("Row "+row.getRowNum()+"is a empty row");
continue;
}
Iterator<Cell> cellIterator = row.cellIterator();
Cell cell =null;
while (cellIterator.hasNext()) {
cell = cellIterator.next();
switch (cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
String value = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_NUMERIC:
Double d = cell.getNumericCellValue();
break;
case Cell.CELL_TYPE_STRING:
String value = cell.getStringCellValue().trim();
break;
case Cell.CELL_TYPE_BLANK:
break;
}
}
}

excel file reading row wise values

im developing one tool for uploading excel and validate it, but excel file is large and the row count is about 65536.
here is my code used for uploading and reading the excel sheet values
int firstColNo = 1;
int rowcount = sheet.getRows();
int colCount = sheet.getColumns();
int row = 0;
String comp = "";
for (row = 1; row < rowcount; row++) {
if (labelCell != null) {
cell = sheet.getCell(firstColNo, row);
if (cell.getContents() != null && cell.getContents().length() > 0){
String compoundId = cell.getContents();
System.out.println(compoundId);
} else {
System.out.println("-");
}
}
}
by reading the row values it takes more to time to read, is there any way to make it faster else any code modifications need to be done in my code?
can anybody help me to overcome this issue.

Here is an example for you
HSSFWorkbook workbook = new HSSFWorkbook(file);
//Get first sheet from the workbook
HSSFSheet sheet = workbook.getSheetAt(0);
//Iterate through each rows from first sheet
Iterator<Row> rowIterator = sheet.iterator();
while(rowIterator.hasNext()) {
Row row = rowIterator.next();
//For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
while(cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch(cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
System.out.print(cell.getBooleanCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_NUMERIC:
System.out.print(cell.getNumericCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "\t\t");
break;
}
}
System.out.println("");
}

How to get an Excel Blank Cell Value in Apache POI?

I have a huge excel file with tons of columns which looks like this :-
Column1 Column2 Column3 Column4 Column5
abc def ghi
mno pqr
......
This is the code that I wrote to print these values:
try {
FileInputStream inputStr = new FileInputStream(fileName);
XSSFWorkbook xssfWork = new XSSFWorkbook(inputStr) ;
XSSFSheet sheet1 = xssfWork.getSheetAt(0);
Iterator rowItr = sheet1.rowIterator();
while ( rowItr.hasNext() ) {
XSSFRow row = (XSSFRow) rowItr.next();
System.out.println("ROW:-->");
Iterator cellItr = row.cellIterator();
while ( cellItr.hasNext() ) {
XSSFCell cell = (XSSFCell) cellItr.next();
System.out.println("CELL:-->"+cell.toString());
}
}
} catch (Exception e) {
e.printStackTrace();
}
The output generated by this code is :-
ROW:-->
CELL:-->Column1
CELL:-->Column2
CELL:-->Column3
CELL:-->Column4
CELL:-->Column5
ROW:-->
CELL:-->abc
CELL:-->def
CELL:-->ghi
ROW:-->
CELL:-->mno
CELL:-->pqr
So, If we look at the output above we can note that the cells where I left blank values was not picked up by the POI library , is there a way in which I can get these values as null. or a way to recognize that the values presented skipped blank cells?
Thanks.

If you want to get all cells, no matter if they exist or not, then the iterator isn't for you. Instead, you need to manually fetch the appropriate cells, likely with a missing cell policy
for(Row row : sheet) {
for(int cn=0; cn<row.getLastCellNum(); cn++) {
// If the cell is missing from the file, generate a blank one
// (Works by specifying a MissingCellPolicy)
Cell cell = row.getCell(cn, Row.MissingCellPolicy.CREATE_NULL_AS_BLANK);
// Print the cell for debugging
System.out.println("CELL: " + cn + " --> " + cell.toString());
}
}
There's more details on all of this in the Apache POI documentation on iterating over cells

I have been frustrated by this same problem. Here is what I found with poi-3.7-20101029 and poi-3.8.
RowIterator and CellIterator do not support iterating over NULL cells or rows -- only physically defined cells (which can be BLANK).
The solution that returns what I expect requires using the 0-based Row.getCell([int], Row.CREATE_NULL_AS_BLANK), much like Chavira's answer alludes to (assuming 8 cell rows). Or you can use the Cell.columnIndex value while iterating to check for jumping numbers...
Annoyingly, after creating blank cells using method #1, the iterators will return the now created BLANK cells. I consider it a bug that MissingCellPolicy is ignored by CellIterator.

The reason is quite simple: Excel files can contain as many rows and as many columns as possibles, so returning all available blank rows and columns will render the cells huge and memory intensive.
Assuming you have a 10x10 sheet, in Excel, it's not "exactly" 10x10 since you can add 11x10 very easily with blank cell, so should POI return the 11th column?
One way to do what you're requesting is to use HSSFCell.getColumnIndex().
Example:
//Assuming your have a 2 dimensional array.
String[][] values = ......;// It is assigned
POIFSFileSystem fileSystem = new POIFSFileSystem(new FileInputStream(fileName));
HSSFWorkbook workbook = new HSSFWorkbook(fileSystem);
//Going through every worksheet.
for (int sheetPos = 0; sheetPos < workbook.getNumberOfSheets(); sheetPos++) {
HSSFSheet sheet = workbook.getSheetAt(sheetPos);
int rowPos = 0;
Iterator<Row> rows = sheet.rowIterator();
while (rows.hasNext()) {
HSSFRow row = (HSSFRow) rows.next();
Iterator<Cell> cells = row.cellIterator();
while (cells.hasNext()) {
HSSFCell cell = (HSSFCell) cells.next();
String value = "";
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC:
value = BigDecimal.valueOf(cell.getNumericCellValue()).toPlainString();
break;
case HSSFCell.CELL_TYPE_STRING:
value = cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_BLANK:
value = "";
break;
case HSSFCell.CELL_TYPE_FORMULA:
value = cell.getCellFormula();
break;
default:
break;
}
values[rowPos][cell.getColumnIndex()] = value;
}
rowPos++;
}
}

Below is what worked for me. The "row.CREATE_NULL_AS_BLANK" did not appear to be valid but that could be lack of NPOI knowledge.
HSSFCell dataCell= (HSSFCell)row.GetCell(column, NPOI.SS.UserModel.MissingCellPolicy.CREATE_NULL_AS_BLANK);

for(org.apache.poi.ss.usermodel.Row tmp : hssfSheet){
for(int i = 0; i<8;i++){
System.out.println(tmp.getCell(i));
}
}

This worked for me....
int rowNumber;
int previousCell;
int currentCell;
int currentRowNumber;
HSSFCell cell;
while (rows.hasNext()) {
previousCell = -1;
currentCell = 0;
while (cellIterator.hasNext()) {
cell = (HSSFCell) cellIterator.next();
currentCell = cell.getColumnIndex();
if (previousCell == currentCell-1) {
//...
}
else {
System.out.println("Blank cell found");
}
previousCell = currentCell;
}
}

List cellDataList = new ArrayList();
int lineNumber = 0;
while (rowIterator.hasNext()) {
HSSFRow hssfRow = (HSSFRow) rowIterator.next();
//System.out.println("Befor If");
lineNumber++;
if(lineNumber==1){continue;}
//System.out.println("Out side if ");
Iterator<Cell> iterator = hssfRow.cellIterator();
List<Cell> cellTempList = new ArrayList();
int current = 0, next = 1;
while (iterator.hasNext()) {
Cell hssfCell = iterator.next();
current = hssfCell.getColumnIndex();
if(current<next){
System.out.println("Condition Satisfied");
}
else{
int loop = current-next;
System.out.println("inside else Loop value : "+(loop));
for(int k=0;k<loop+1;k++){
System.out.println("Adding nulls");
cellTempList.add(null);
next = next + 1;
}
}
cellTempList.add(hssfCell);
next = next + 1;
System.out.println("At End next value is : "+next);
}
cellDataList.add(cellTempList);
}

public String[] rowToString(Row row)
{
Iterator<Cell> cells = row.cellIterator() ;
String[] data = new String[row.getLastCellNum()] ;
int previousCell = 0 ;
Cell cell = cells.next() ;
int currentCell = cell.getColumnIndex();
while (true)
{
if (previousCell == currentCell) {
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:
data[previousCell] = cell.getNumericCellValue()+"" ;
break;
case Cell.CELL_TYPE_STRING:
data[previousCell] = cell.getStringCellValue() ;
break;
/* // there could be other cases here.
case Cell.CELL_TYPE_FORMULA:
data[previousCell] =eval.evaluateFormulaCell(cell);
break;
case Cell.CELL_TYPE_BOOLEAN:
data[previousCell] = cell.getBooleanCellValue();
break;
case Cell.CELL_TYPE_BLANK:
data[previousCell] = "";
break;
case Cell.CELL_TYPE_ERROR:
data[previousCell] = "ERROR";
break;
*/
}
if(cells.hasNext()){
cell = cells.next() ;
currentCell = cell.getColumnIndex();
} else {
break ;
}
} else {
data[previousCell] = "";
}
previousCell++ ;
}
return data ;
}

for (Row row: sheet){
// This will return null if cell is empty / blank
Cell cell = row.getCell(columnNumber);
}

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Java - Excel read multiple row data - java

Related

How to read contents of Excel sheet and storing it in a map with column1 as key, and the remaining columns as values

while reading excel sheet in java it tends to skip one cell value and auto populate it with next colomn

Get the no of columns in excel [duplicate]

excel file reading row wise values

How to get an Excel Blank Cell Value in Apache POI?

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