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();   
}   
}   
}