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How to read from the first to the last row in excel using poi in java?

I use apache poi to read excel file, this code also works without any problems, but the code reads data from the middle and does not read from the first line of the file.

the code:

package org.sample;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;

public class Main {

    @SuppressWarnings("unchecked")
    public static void main(String[] args) throws Exception {
//
// An excel file name. You can create a file name with a full
// path information.
//
        String fileName = "D:/workspace/ReadExlsx/xlsx/SampleData.xls";


// Create an ArrayList to store the data read from excel sheet.
//
        List sheetData = new ArrayList();

        FileInputStream fis = null;
        try {
//
// Create a FileInputStream that will be use to read the
// excel file.
//
            fis = new FileInputStream(fileName);

//
// Create an excel workbook from the file system.
//
            HSSFWorkbook workbook = new HSSFWorkbook(fis);
//
// Get the first sheet on the workbook.
//
            HSSFSheet sheet = workbook.getSheetAt(0);

//
// When we have a sheet object in hand we can iterator on
// each sheet rows and on each row cells. We store the
// data read on an ArrayList so that we can printed the
// content of the excel to the console.
//
            Iterator rows = sheet.rowIterator();
            while (rows.hasNext()) {
                HSSFRow row = (HSSFRow) rows.next();
                Iterator cells = row.cellIterator();

                List data = new ArrayList();
                while (cells.hasNext()) {
                    HSSFCell cell = (HSSFCell) cells.next();
                    data.add(cell);
                }

                sheetData.add(data);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fis != null) {
                fis.close();
            }
        }

        showExelData(sheetData);
    }

    private static void showExelData(List sheetData) {
//
// Iterates the data and print it out to the console.
//
        for (int i = 0; i < sheetData.size(); i++) {
            List list = (List) sheetData.get(i);
            //for (int j = 0; j < list.size(); j++) {
                HSSFCell employeeid = (HSSFCell) list.get(0);
                HSSFCell department = (HSSFCell) list.get(3);
                HSSFCell date = (HSSFCell) list.get(5);
                System.out.print(employeeid.getRichStringCellValue().getString()+" , ");
                System.out.print(department.getRichStringCellValue().getString()+" , ");
                System.out.print(date.getRichStringCellValue().getString());
                //if (j < list.size() - 1) {
                   // System.out.print(", ");
                //}
           // }
            System.out.println("");
        }
    }
}

Help solve this problem.

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2 answers

If you have int data i rows and J columns, you should try the code as follows:

   for (int i = 0; i < sheetData.size(); i++) {
        List list = (List) sheetData.get(i);
        for (int j = 0; j < list.size(); j++) {
            HSSFCell employeeid = (HSSFCell) list.get(j);
            System.out.print(employeeid.getRichStringCellValue().getString());
            if (j < list.size() - 1) {
                System.out.print(", ");
            }
        }
        System.out.println("");
    }

for me it worked perfectly. My version of poi is poi-3.8-20120306.

+4
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// Get a workbook instance for the XLS file

XSSFWorkbook workbook = new XSSFWorkbook(file);

// Get the first sheet from the book

XSSFSheet sheet = workbook.getSheetAt(0);

ArrayList<String> columndata = null;

Iterator<Row> rowIterator = sheet.iterator();
columndata = new ArrayList<>();

while (rowIterator.hasNext()) {
    Row row = rowIterator.next();
    Iterator<Cell> cellIterator = row.cellIterator();
    while (cellIterator.hasNext()) {
        Cell cell = cellIterator.next();

        if (row.getRowNum() > 0) { // To filter column headings
            if (cell.getColumnIndex() == 0) {// To match column
                                                // index
                switch (cell.getCellType()) {
                case Cell.CELL_TYPE_NUMERIC:
                    columndata.add(cell.getNumericCellValue() + "");
                    break;
                case Cell.CELL_TYPE_STRING:
                    columndata.add(cell.getStringCellValue());
                    break;
                }
            }
        }
    }
}
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