<dependency>

            <groupId>org.apache.poi</groupId>

            <artifactId>poi</artifactId>

            <version>3.17</version>

        </dependency>

        <dependency>

            <groupId>org.apache.poi</groupId>

            <artifactId>poi-ooxml</artifactId>

            <version>3.17</version>

        </dependency>                

package com.wf.zhang.test;

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;

    }

}

Student

package com.wf.zhang.test;

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;

import org.apache.poi.ss.usermodel.HorizontalAlignment;

public class ExportExcel

{

    /**

     * @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 创建单元格样式 单元格居中

        HSSFCellStyle style = wb.createCellStyle();

        style.setAlignment(HorizontalAlignment.CENTER);;

        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 = ExportExcel.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("C:/Users/admin/Desktop/students.xls");

            wb.write(fout);

            fout.close();

        }

        catch (Exception e)

        {

            e.printStackTrace();

        }

    }

}