Using Apache POI, I am trying to read an excel file. The file has 1000 rows and 1 column. With this code:
XSSFSheet ws = workbook.getSheetAt(0);
Iterator< Row > rowIt = ws.iterator();
XSSFRow row;
int i = 0;
while ( rowIt.hasNext() ) {
row = (XSSFRow) rowIt.next();
Iterator< Cell > cellIt = row.cellIterator();
while ( cellIt.hasNext() ) {
Cell cell = cellIt.next();
my_array[ i ] = cell.getStringCellValue();
}
++i;
}
It seems that it reads 1001 rows and since the last row is "", my_array get invalid string. Is there any way to fix that? I expect rowIt.hasNext() is responsible for that but it doesn't work as expected.
The file has 1000 rows and 1 column : you must specify what column you are reading.
here an exemple that specify column with this excel file:
public class TestLecture {
public static void main(String[] args) throws IOException{
List<String> mys_list= new ArrayList<String>();
FileInputStream file = new FileInputStream(new File("test.xlsx"));
//Get the workbook instance for XLS file
XSSFWorkbook workbook = new XSSFWorkbook (file);
//Get first sheet from the workbook
XSSFSheet ws = workbook.getSheetAt(0);
//Get iterator to all the rows in current sheet
Iterator<Row> rowIt = ws.iterator();
while (rowIt.hasNext()) {
Row row = rowIt.next();
Iterator<Cell> cellIt = row.iterator();
while (cellIt.hasNext()) {
Cell cell = cellIt.next();
int columnIndex = cell.getColumnIndex();
switch (columnIndex) {
case 2:
mys_list.add(cell.getStringCellValue());
break;
}
}
}
System.out.println(mys_list.size());
for(String g :mys_list){
System.out.println(g);
}
}
}
Related
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I am in a learning stage of Java. I want to write a program in Java which reads one Excel file (.xlsx). This file has some columns and many rows. I want to write the data in another Excel file (.xlsx) only the condition is met not all the data from existing file.
My Excel sheet looks like below
I want to filter only those rows with broker Edelweiss and put it in another Excel sheet. I am aware how to copy all the data from one Excel to another Excel using Java. I don't know how to filter a specific row and put it in another Excel.
Here is my code.
FileInputStream file = new FileInputStream(new File("broker.xlsx"));
//Create Workbook instance holding reference to .xlsx file
XSSFWorkbook workbook = new XSSFWorkbook(file);
//Get first/desired sheet from the workbook
XSSFSheet sheet = workbook.getSheetAt(0);
//Iterate through each rows one by one
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext())
{
Row row = rowIterator.next();
//For each row, iterate through all the columns
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext())
{
Cell cell = cellIterator.next();
//Check the cell type and format accordingly
switch (cell.getCellType())
{
case Cell.CELL_TYPE_NUMERIC:
System.out.print(cell.getNumericCellValue() + "t");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "t");
break;
}
}
System.out.println("");
}
file.close();
}
catch (Exception e)
{
e.printStackTrace();
}
I am getting the below error when I run Axel Richter's code which is shared below
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/io/output/UnsynchronizedByteArrayOutputStream
at org.apache.poi.poifs.filesystem.FileMagic.valueOf(FileMagic.java:209)
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:222)
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:185)
at writefile.main(writefile.java:92)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
I have included below jars in my classpath
POI_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/poi-5.2.2.jar
POI_OOXML_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/poi-ooxml-full-5.2.2.jar
XML_BEANS_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/ooxml-lib/xmlbeans-5.0.3.jar
COM_COLL_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/lib/commons-collections4-4.4.jar
COM_COMPRESS_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/ooxml-lib/commons-compress-1.21.jar
COM_CODEC_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/lib/commons-codec-1.15.jar
COM_IO_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/lib/commons-io-2.11.0.jar
COM_MATH_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/lib/commons-math3-3.6.1.jar
LOG_J4_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/lib/log4j-api-2.17.2.jar
SPARSE_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/lib/SparseBitSet-1.2.jar
COM_LOGG_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/ooxml-lib/commons-logging-1.2.jar
CURVE_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/ooxml-lib/curvesapi-1.07.jar
SLF4_LIB=$(TOP_DIR)/jar/poi-bin-5.2.2/ooxml-lib/slf4j-api-1.7.36.jar
I will make my comment an answer.
I would open the source sheet and loop through all rows in it. For each row I would get the content of the column where "Broker" is stored. Then, if that content equals "Edelweiss" I would get that row into a Java collection, a list of rows for example. After that I would write the content of that Java collection into the result sheet.
The following complete example shows this.
It contains methods to get the last filled row in a special column of a sheet and to get the last filled column in a special row of a sheet. That is to determine the used cell range of a sheet.
It also contains a method to get the headings, which maps headings to column indexes. The headings must be in first row of the used cell range of the sheet.
It also shows how to use CellUtil.copyCell to copy cells from one sheet to another.
The code is tested and works using current apache poi 5.2.2.
The first sheet of broker.xlsx looks like:
Code:
import java.io.FileOutputStream;
import java.io.FileInputStream;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellUtil;
import java.util.Locale;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;
class ExcelFilterRowsToNewWorkbook {
static int getLastFilledRow(Sheet sheet, int col) {
int lastStoredRowNum = sheet.getLastRowNum();
for (int r = lastStoredRowNum; r >= 0; r--) {
Row row = sheet.getRow(r);
if (row != null) {
Cell cell = row.getCell(col);
if (cell != null && cell.getCellType() != CellType.BLANK) return row.getRowNum();
}
}
return -1; // the sheet is empty in that col
}
static int getLastFilledColumn(Sheet sheet, int rowIdx) {
int lastStoredCellNum = sheet.getRow(rowIdx).getLastCellNum();
Row row = sheet.getRow(rowIdx);
if (row != null) {
for (int c = lastStoredCellNum; c >= 0; c--) {
Cell cell = row.getCell(c);
if (cell != null && cell.getCellType() != CellType.BLANK) return cell.getColumnIndex();
}
}
return -1; // the sheet is empty in that row
}
static Map<Integer, String> getHeadings(Sheet sheet) {
DataFormatter dataFormatter = new DataFormatter(new Locale("en", "US"));
dataFormatter.setUseCachedValuesForFormulaCells(true);
int firstRow = sheet.getFirstRowNum();
int firstCol = sheet.getRow(firstRow).getFirstCellNum();
int lastCol = getLastFilledColumn(sheet, firstRow);
Map<Integer, String> headings = new HashMap<Integer, String>();
Row row = sheet.getRow(firstRow);
if (row != null) {
for (int c = firstCol; c <= lastCol; c++) {
Cell cell = row.getCell(c);
headings.put(c, dataFormatter.formatCellValue(cell));
}
}
return headings;
}
static List<Row> filterRows(Sheet sheet, String filterHeading, String filterValue) {
int filterCol = -1;
Map<Integer, String> headings = getHeadings(sheet);
for (Map.Entry<Integer, String> entry : headings.entrySet()) {
if (entry.getValue().equals(filterHeading)) {
filterCol = entry.getKey();
break;
}
}
List<Row> rows = new ArrayList<Row>();
// add the headings row
int firstRow = sheet.getFirstRowNum();
rows.add(sheet.getRow(firstRow));
// add the fildered rows
if (filterCol > -1) {
DataFormatter dataFormatter = new DataFormatter(new Locale("en", "US"));
dataFormatter.setUseCachedValuesForFormulaCells(true);
int firstCol = sheet.getRow(firstRow).getFirstCellNum();
int lastCol = getLastFilledColumn(sheet, firstRow);
int lastRow = getLastFilledRow(sheet, firstCol);
for (int r = firstRow; r <= lastRow; r++) {
Row row = sheet.getRow(r);
if (row != null && lastCol >= filterCol) {
Cell cell = row.getCell(filterCol);
String cellContent = dataFormatter.formatCellValue(cell);
if (cellContent.equals(filterValue)) {
rows.add(row);
}
}
}
}
return rows;
}
public static void main(String[] args) throws Exception {
try (Workbook workbookSrc = WorkbookFactory.create(new FileInputStream("./broker.xlsx")) ) {
Sheet sheetSrc = workbookSrc.getSheetAt(0);
// get filtered rows
List<Row> rowsSrc = filterRows(sheetSrc, "Broker", "Edelweiss");
// add filtered rows in new workbook
try (Workbook workbookDest = WorkbookFactory.create(true);
FileOutputStream fileout = new FileOutputStream("./brokerFiltered.xlsx") ) {
Sheet sheetDest = workbookDest.createSheet();
int r = 0;
for (Row rowSrc : rowsSrc) {
Row rowDest = sheetDest.createRow(r++);
for (Cell cellSrc : rowSrc) {
Cell cellDest = rowDest.createCell(cellSrc.getColumnIndex());
CellUtil.copyCell(cellSrc,
cellDest,
new CellCopyPolicy(),
new CellCopyContext()
);
}
}
workbookDest.write(fileout);
}
}
}
}
The first sheet of brokerFiltered.xlsx then looks like:
I have one excel file with 4 different sheets to be read for my project. All 4 sheets contain different headers and different number of columns. When I delete all the headers and make everything look same by having same number of columns the code works. But I have no authority to modify the excel sheet as I wish.
Please somebody suggest me a way how to make the excel file to be read with headers even with different number of columns. Here is my code to read excel file:
public class ReadExcelFileAndStore {
public List getTheFileAsObject(String filePath){
List <Employee> employeeList = new ArrayList<>();
try {
FileInputStream file = new FileInputStream(new File(filePath));
// Get the workbook instance for XLS file
HSSFWorkbook workbook = new HSSFWorkbook(file);
int numberOfSheets = workbook.getNumberOfSheets();
//System.out.println(numberOfSheets);
//loop through each of the sheets
for(int i = 0; i < numberOfSheets; i++) {
// Get first sheet from the workbook
HSSFSheet sheet = workbook.getSheetAt(i);
String sheetName = workbook.getSheetName(i);
// Iterate through each rows from first sheet
Iterator <Row> rowIterator = sheet.rowIterator();
Row headerRow= rowIterator.next();
while (rowIterator.hasNext()) {
// Get Each Row
Row row = rowIterator.next();
// For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
Employee employee = new Employee();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
int columnIndex = cell.getColumnIndex();
switch (columnIndex + 1) {
case 1:
employee.setEmpName(cell.getStringCellValue());
break;
case 2:
employee.setExtCode((int) cell.getNumericCellValue());
break;
}
}
employeeList.add(employee);
}
}
file.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return employeeList;
}
}
Please excuse me if I am not clear. English is not my first language.
I'm trying to write a code where I can traverse through the first row of an excel file until I find the column labeled 'Comments'. I want to run some action on the text in that column and then save the result in a new column at the end of the file. Can I traverse the xlsx file in a manner similar to indexes? And if so, how can I jump straight to a cell using that cell's coordinates?
public static void main(String[] args) throws IOException {
File myFile = new File("temp.xlsx");
FileInputStream fis = null;
try {
fis = new FileInputStream(myFile);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
#SuppressWarnings("resource")
XSSFWorkbook myWorkBook = new XSSFWorkbook (fis);
XSSFSheet mySheet = myWorkBook.getSheetAt(0);
Iterator<Row> rowIterator = mySheet.iterator();
Row row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
String comment = cell.toString();
if (comment.equals("Comments"))
{
System.out.println("Hello");
}
}
}
}
For the question "Wanted to go to the second column's 3rd row I could use coordinates like (3, 2)?":
Yes this is possible using CellUtil. Advantages over the methods in Sheet and Row are that CellUtil methods are able getting the cell if it exists already or creating the cell if it not already exists. So existing cells will be respected instead simply new creating them and so overwriting them.
Example:
import java.io.FileOutputStream;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.util.CellUtil;
import java.util.concurrent.ThreadLocalRandom;
public class CreateExcelCellsByIndex {
public static void main(String[] args) throws Exception {
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet();
//put content in R3C2:
Cell cell = CellUtil.getCell(CellUtil.getRow(3-1, sheet), 2-1); //-1 because apache poi's row and cell indexes are 0 based
cell.setCellValue("R3C2");
//put content in 10 random cells:
for (int i = 1; i < 11; i++) {
int r = ThreadLocalRandom.current().nextInt(4, 11);
int c = ThreadLocalRandom.current().nextInt(1, 6);
cell = CellUtil.getCell(CellUtil.getRow(r-1, sheet), c-1);
String cellcontent = "";
if (cell.getCellTypeEnum() == CellType.STRING) {
cellcontent = cell.getStringCellValue() + " ";
}
cell.setCellValue(cellcontent + i + ":R"+r+"C"+c);
}
workbook.write(new FileOutputStream("CreateExcelCellsByIndex.xlsx"));
workbook.close();
}
}
FileInputStream file = new FileInputStream(new File(fileLocation));
Workbook workbook = new XSSFWorkbook(file);
Sheet sheet = workbook.getSheetAt(0);
Map<Integer, List<String>> data = new HashMap<>();
int i = 0;
for (Row row : sheet) {
data.put(i, new ArrayList<String>());
for (Cell cell : row) {
switch (cell.getCellTypeEnum()) {
case STRING: ... break;
case NUMERIC: ... break;
case BOOLEAN: ... break;
case FORMULA: ... break;
default: data.get(new Integer(i)).add(" ");
}
}
i++;
}
I'm not sure what you mean by 2D index, but a Cell knows which column it belongs to so something like this should work:
...
Cell cell = cellIterator.next();
String comment = cell.toString();
int sourceColumnIndex = -1;
if (comment.equals("Comments")) {
System.out.println("Hello");
sourceColumnIndex = cell.getColumnIndex();
}
....
Similarly, define something like int targetColumnIndex to represent the column which will have the result from processing all the cells from the sourceColumnIndex column.
I need to filter my excel spreadsheet for the word "GHH" anywhere in the text of a cell in a specific column. I have managed to do this by I then need to have returned the whole row that this text is found in. This I can't do as there doesnt seem to be a way of using the getRowIndex method to then display the whole row.
Here is my code:
public static void main(String[] args) throws IOException {
FileInputStream fis = new FileInputStream(new File("myfile.xls"));
HSSFWorkbook workBook = new HSSFWorkbook(fis);
HSSFSheet sheet = workBook.getSheetAt(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();
if (cell.toString().contains("GHH")) {
String key = cell.getStringCellValue();
int RI = cell.getRowIndex();
}
}
}
workBook.close();
}
You could try to use a List<HSSFRow> to save filtered rows as bellow:
List<HSSFRow> filteredRows = new ArrayList<HSSFRow>();
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 ();
if (cell.toString().contains("GHH")) {
String key = cell.getStringCellValue();
int RI=cell.getRowIndex();
filteredRows.add(row);
break;
}
}
// then use filteredRows
You probably want to have two bits of logic, one for handling a "matched" row, one for matching. Something like:
DataFormatter formatter = new DataFormatter();
public void matchingRow(Row row) {
System.out.println("Row " + (row.getRowNum()+1) + " matched:");
for (Cell c : row) {
System.out.println(" " + formatter.formatCellValue(cell));
}
}
public void handleFile(File excel) throws Exception {
Workbook wb = WorkbookFactory.create(excel);
Sheet sheet = wb.getSheetAt(0);
for (Row row : sheet) {
boolean matched = false;
for (Cell cell : row) {
if (matched) continue;
if (formatter.formatCellValue(cell).contains("GHH")) {
matchingRow(row);
matched = true;
}
}
}
}
That will check every cell in the first sheet, and if the text of a cell in a row matches GHH will then print out the row's contents. If a row has that in twice, it'll only print it once
I have the excel file the code works fine, but how can I get each column and row value differently so that I can store the value in database. Thank you in advance
public class excel_demo {
public static void main(String[] args) {
try {
FileInputStream file = new FileInputStream(new File("C:\\Users\\Admin\\Downloads\\ExcelDemosWithPOI\\howtodoinjava_demo.xlsx"));
//Create Workbook instance holding reference to .xlsx file
XSSFWorkbook workbook = new XSSFWorkbook(file);
//Get first/desired sheet from the workbook
XSSFSheet sheet = workbook.getSheetAt(0);
//Iterate through each rows one by one
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()) {
Row row = rowIterator.next();
//For each row, iterate through all the columns
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
//Check the cell type and format accordingly
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:
System.out.print(cell.getNumericCellValue() + "\t");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue() + "\t");
break;
}
}
System.out.println("");
}
file.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
download JEXCEL api,and use this code,
import jxl.*;//import jxl package.
File excelSheet = null;
Workbook workbook = null;
Workbook wb = Workbook.getWorkbook(new File(destFile));//destFile is excel file
Sheet sheet = wb.getSheet(sheetNo);
columns = sheet.getColumns();
rows = sheet.getRows();
for(int row = 0;row <rows;row++)
{
for(int col =0;col <columns;col++)
{
a[row][col] =Integer.parseInt( sheet.getCell(col,row).getContents());
}
}
Hope this helps..