import java.io.FileInputStream;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

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.CellType;

public class POIReadExcelTool {

    public static void main(String[] args) throws Exception {
        List<Student> list = readXls();
        for(Student stu : list){
            System.out.println(stu.getId());
            System.out.println(stu.getName());
            System.out.println(stu.getAge());
            System.out.println(stu.getBirth());
        }
    }

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

        HSSFWorkbook excel = new HSSFWorkbook(is);
        Student stu = null;
        List<Student> list = new ArrayList<Student>();
        
        // 迴圈工作表Sheet
        for (int numSheet = 0; numSheet < excel.getNumberOfSheets(); numSheet++) {
            HSSFSheet sheet = excel.getSheetAt(numSheet);
            if (sheet == null)
                continue;
            // 迴圈行Row
            for (int rowNum = 1; rowNum < sheet.getLastRowNum(); rowNum++) {
                HSSFRow row = sheet.getRow(rowNum);
                if (row == null)
                    continue;
                stu = new Student();
                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(new SimpleDateFormat("yyyy-mm-dd").parse(cell3.getStringCellValue()));
                list.add(stu);
            }
        }

        return list;
    }

    @SuppressWarnings("unused")
    private static String getValue(HSSFCell cell) {
        if (cell.getCellType() == CellType.BOOLEAN) {
            // 返回布林型別 值
            return String.valueOf(cell.getBooleanCellValue());
        } else if (cell.getCellType() == CellType.NUMERIC) {
            //返回數值型別的值
            return String.valueOf(cell.getNumericCellValue());
        } else {
            //返回字串型別的值
            return cell.getStringCellValue();
        }
    }
}
 

import java.util.Date;

public class Student {
private int Id;
private String Name;
private int age;
private Date Birth;
public int getId() {
return Id;
}
public void setId(int id) {
Id = id;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getBirth() {
return Birth;
}
public void setBirth(Date birth) {
Birth = birth;
}

}