How to read Excel file in Java using HSSF Jakarta POI

There are many way to read excel files in java

1. Using jexcelapi API that explained in previous post. (Only for .xls extenstion)
2. Using HSSF Jakarta POI, that will explain in this posting. (Only for .xls extenstion)

STEP1: Download poi-3.0-FINAL.jar from jakarta site or here.
SETP2: Write one Excel file say Binod2.xls
SETP3: Write ReadExcelFile.java
Both excel and java file should be in the same folder. Put poi-3.0-FINAL.jar in workspace.

ReadExcelFile.java

import org.apache.poi.hssf.usermodel.*;
import java.io.*;
import java.util.*;

public class ReadExcelFile {

public static void main(String[] args) throws Exception {
readWorkbook("Binod2.xls");
}

private static void readWorkbook(String filename) throws Exception {
InputStream input = new FileInputStream(filename);
HSSFWorkbook wb = new HSSFWorkbook(input);
for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) { HSSFSheet sheet = wb.getSheetAt(sheetIndex);
Iterator rowIter = sheet.rowIterator();
while (rowIter.hasNext()) {
HSSFRow row = (HSSFRow) rowIter.next();
Iterator cellIter = row.cellIterator();
while (cellIter.hasNext()) {
HSSFCell cell = (HSSFCell) cellIter.next();
printCellValue(cell); }
}
} input.close();
}

private static void printCellValue(HSSFCell c) {
int cellType = c.getCellType();
if (cellType == HSSFCell.CELL_TYPE_BOOLEAN) { System.out.println(c.getBooleanCellValue()); }
else if (cellType == HSSFCell.CELL_TYPE_STRING) { System.out.println(c.getRichStringCellValue().getString()); }
else if (cellType == HSSFCell.CELL_TYPE_FORMULA) { System.out.println(c.getCellFormula()); } else if (cellType == HSSFCell.CELL_TYPE_NUMERIC)
{ System.out.println(c.getNumericCellValue()); }
else if (cellType == HSSFCell.CELL_TYPE_ERROR)
{ System.out.println(c.getErrorCellValue()); }
}
}