java实现excel导出

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;
     }
}
 3.CreateSimpleExcelToDisk.java 
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();
         }
     }
 }