How to read an excel and fetch multiple values and concatenate them using data-provider in selenium web driver and testNG

Question

I want to read an excel and fetch 10 records at a time and concatenate them too using data-provider in selenium web driver and testNG. For example, Excel sheet having two columns i.e, col 1, col 2 and 10 rows. Now I want to pass the fetched result from an excel as value into the text-box using selenium web-driver i.e, "A,B,C,D,E,F,G,H,J,I," as value. Here, row1 col1 contains "A" and row 1 col 2 contains "," . Similarly, it is like this for rest of the rows and cols. Can you please provide me the code for this logic.

Answer 1

Connect to excel file using JDBC driver and use it as database by SQL:

how-to-connect-to-excel-spreadsheet

Answer 2

read and write data from excel   
 import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;

    import org.apache.poi.xssf.usermodel.XSSFCell;
    import org.apache.poi.xssf.usermodel.XSSFRow;
    import org.apache.poi.xssf.usermodel.XSSFSheet;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;

    public class ExcelReader {
        public FileInputStream fis = null;
        public FileOutputStream fout = null;
        private XSSFWorkbook workbook = null;
        private XSSFSheet sheet = null;
        private XSSFRow row = null;
        private XSSFCell cell = null;
        String path = null;

        public ExcelReader() throws IOException {
            path = System.getProperty("user.dir") + "\\testdata\\testdata.xlsx";
            fis = new FileInputStream(path);//FileInputStream is used to read excel.
            workbook = new XSSFWorkbook(fis);//workbook is excel file include multiple sheet
            sheet = workbook.getSheetAt(0);//focusing on particular sheet in workbook.
        }
    //get number of rows in selected sheet.
        public int getSheetRows(String sheetName) {
            int index = workbook.getSheetIndex(sheetName);
            workbook.getSheetAt(index);
            return (sheet.getLastRowNum() + 1);
        }
    //get number of columns in selected sheet
        public int getSheetColumn(String sheetName) {
            int index = workbook.getSheetIndex(sheetName);
            workbook.getSheetAt(index);
            row = sheet.getRow(0);
            return (row.getLastCellNum());
        }
    //get the values in cell by using sheet name and row number and column number
        public String getCellData(String sheetName, int rowNum, int colNum) {
            int index = workbook.getSheetIndex(sheetName);
            sheet = workbook.getSheetAt(index);
            row = sheet.getRow(rowNum);
            cell = row.getCell(colNum);
            return (cell.getStringCellValue());
        }
    //get the values form cell by using the sheetname and row number and column name 
        public String getCellData(String sheetName, int rowNum, String ColName) {
            int CellNum = -1;
            int index = workbook.getSheetIndex(sheetName);
            sheet = workbook.getSheetAt(index);

            for (int i = 0; i < getSheetColumn(sheetName); i++) {
                row = sheet.getRow(0);
                cell = row.getCell(i);
                if (cell.getStringCellValue().equals(ColName)) {
                    CellNum = cell.getColumnIndex();
                    break;
                }
            }
            row = sheet.getRow(rowNum);
            cell = row.getCell(CellNum);
            return (cell.getStringCellValue());

        }
    //write the data into sheet.
        public void setData(String sheetName, int ColNum, int rowNum, String str) {
            int index = workbook.getSheetIndex(sheetName);
            sheet = workbook.getSheetAt(index);

            row = sheet.getRow(rowNum);
            cell = row.createCell(ColNum);
            cell.setCellValue(str);

            try {
                fout = new FileOutputStream(path);

                try {
                    workbook.write(fout);
                    fout.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            } catch (FileNotFoundException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

        }

        public static void main(String[] args) throws IOException {
            ExcelReader reader = new ExcelReader();

              System.out.println(reader.getSheetRows("LoginTest"));
              System.out.println(reader.getSheetColumn("LoginTest"));
              System.out.println(reader.getSheetRows("SignUPTest"));
              System.out.println(reader.getSheetColumn("SignUpTest"));
              System.out.println(reader.getCellData("LoginTest", 1, 0));
             System.out.println(reader.getCellData("LoginTest", 2, "password"));
            reader.setData("LoginTest", 1, 1, "Hello");
        }
    }