Read excel file and store as object

Read excel file and store as object

import com.ruoyi.system.domain.Student;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class test3 {

public static void main(String[] args) throws Exception {
    List<Student> list = readXls();
    for(Student stu : list){
        studentMapper.add(stu);
    }
}

public static List<Student> readXls() throws Exception {
    InputStream is = new FileInputStream("D:/student.xls");

    HSSFWorkbook excel = new HSSFWorkbook(is);
    Student stu = null;
    List<Student> list = new ArrayList<Student>();

    // 循环工作表Sheet
    for (int numSheet = 0; numSheet < excel.getNumberOfSheets(); numSheet++) {
        HSSFSheet sheet = excel.getSheetAt(numSheet);
        if (sheet == null)
            continue;
        // 循环行Row
        for (int rowNum = 1; rowNum < sheet.getLastRowNum(); rowNum++) {
            HSSFRow row = sheet.getRow(rowNum);
            if (row == null)
                continue;
            stu = new Student();
            // 循环列Cell
            // 0学号 1姓名 2年龄 3生日
            /*System.out.println((int)cell0.getNumericCellValue());
            System.out.println(cell1.getStringCellValue());
            System.out.println((int)cell2.getNumericCellValue());
            System.out.println(cell3.getStringCellValue());*/
			 /**console:
             *         1
              name1
             2018-12-13
              name2
             2019-01-01
             */

HSSFCell cell0 = row.getCell(0);
if (cell0 == null)
continue;
stu.setId((int)cell0.getNumericCellValue());
HSSFCell cell1 = row.getCell(1);
if (cell1 == null)
continue;
stu.setName(cell1.getStringCellValue());
HSSFCell cell2 = row.getCell(2);
if (cell2 == null)
continue;
stu.setAge((int)cell2.getNumericCellValue());
HSSFCell cell3 = row.getCell(3);
if (cell3 == null)
continue;
stu.setBirth(cell3.getStringCellValue());
list.add(stu);
}
}

    return list;
}

@SuppressWarnings("unused")
private static String getValue(HSSFCell cell) {
    if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
        // 返回布尔类型
        return String.valueOf(cell.getBooleanCellValue());
    } else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
        //返回数值类型
        return String.valueOf(cell.getNumericCellValue());
    } else {
        //返回字符串类型
        return cell.getStringCellValue();
    }
}

}