Java 实现导出excel表 POI详解编程语言

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++)  {   
            sheet.addMergedRegion(new CellRangeAddress(1, 10, 0, 0));//指定合并区域 
            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();   
        }   
    }   
}