import java.util.Date;  

 public class Student

 {

     private int id;

     private String name;

     private int age;

     private Date birth;  

     public Student()

     {

     }  

     public Student(int id, String name, int age, Date birth)

     {

         this.id = id;

         this.name = name;

         this.age = age;

         this.birth = birth;

     }  

     public int getId()

     {

         return id;

     }  

     public void setId(int id)

     {

         this.id = id;

     }  

     public String getName()

     {

         return name;

     }  

     public void setName(String name)

     {

         this.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)

     {

         this.birth = birth;

     }  

 }  

 import java.io.FileOutputStream;

 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.HSSFCellStyle;

 import org.apache.poi.hssf.usermodel.HSSFRow;

 import org.apache.poi.hssf.usermodel.HSSFSheet;

 import org.apache.poi.hssf.usermodel.HSSFWorkbook;  

 public class CreateSimpleExcelToDisk

 {

     /**

      * @功能：手工构建一个简单格式的Excel

      */

     private static List<Student> getStudent() throws Exception

     {

         List list = new ArrayList();

         SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd");  

         Student user1 = new Student(1, "张三", 16, df.parse("1997-03-12"));

         Student user2 = new Student(2, "李四", 17, df.parse("1996-08-12"));

         Student user3 = new Student(3, "王五", 26, df.parse("1985-11-12"));

         list.add(user1);

         list.add(user2);

         list.add(user3);  

         return list;

     }  

     public static void main(String[] args) throws Exception

     {

         // 第一步，创建一个webbook，对应一个Excel文件

         HSSFWorkbook wb = new HSSFWorkbook();

         // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet

         HSSFSheet sheet = wb.createSheet("学生表一");

         // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short

         HSSFRow row = sheet.createRow((int) 0);

         // 第四步，创建单元格，并设置值表头 设置表头居中

         HSSFCellStyle style = wb.createCellStyle();

         style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式  

         HSSFCell cell = row.createCell((short) 0);

         cell.setCellValue("学号");

         cell.setCellStyle(style);

         cell = row.createCell((short) 1);

         cell.setCellValue("姓名");

         cell.setCellStyle(style);

         cell = row.createCell((short) 2);

         cell.setCellValue("年龄");

         cell.setCellStyle(style);

         cell = row.createCell((short) 3);

         cell.setCellValue("生日");

         cell.setCellStyle(style);  

         // 第五步，写入实体数据 实际应用中这些数据从数据库得到，

         List list = CreateSimpleExcelToDisk.getStudent();  

         for (int i = 0; i < list.size(); i++)

         {

             row = sheet.createRow((int) i + 1);

             Student stu = (Student) list.get(i);

             // 第四步，创建单元格，并设置值

             row.createCell((short) 0).setCellValue((double) stu.getId());

             row.createCell((short) 1).setCellValue(stu.getName());

             row.createCell((short) 2).setCellValue((double) stu.getAge());

             cell = row.createCell((short) 3);

             cell.setCellValue(new SimpleDateFormat("yyyy-mm-dd").format(stu

                     .getBirth()));

         }

         // 第六步，将文件存到指定位置

         try

         {

             FileOutputStream fout = new FileOutputStream("E:/students.xls");

             wb.write(fout);

             fout.close();

         }

         catch (Exception e)

         {

             e.printStackTrace();

         }

     }

 }