java 写 excel

import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.poi.hssf.util.Region;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFHeader;
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.hssf.record.cf.BorderFormatting;
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();
SimpleDateFormat format = new SimpleDateFormat(
         "yyyy-MM-dd HH:mm:ss");
String createDate = format.format(new Date());
// 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");
sheet.addMergedRegion(new Region(0, (short) 0, 0, (short) 5));//合并第0行第0列至第0行第9列
sheet.addMergedRegion(new Region(1, (short) 0, 1, (short) 5));//合并第0行第0列至第0行第9列
sheet.addMergedRegion(new Region(2, (short) 0, 2, (short) 5));//合并第0行第0列至第0行第9列
HSSFRow row = sheet.createRow((int)0);
HSSFCell cell = row.createCell((short)0);
HSSFCellStyle headerstyle = wb.createCellStyle();
headerstyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
cell.setCellValue("回访结果统计表");
cell.setCellStyle(headerstyle);
HSSFFont headerFont = wb.createFont();
        headerFont.setFontName("宋体");
        headerFont.setFontHeightInPoints((short)22);
        headerstyle.setFont(headerFont);
        cell.setCellStyle(headerstyle);
       
        row = sheet.createRow((int)1);
  cell = row.createCell((short)0);
  headerstyle = wb.createCellStyle();
headerstyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
cell.setCellValue("生成时间 :"+createDate);
cell.setCellStyle(headerstyle);
// 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
  row = sheet.createRow((int)3);
// 第四步，创建单元格，并设置值表头 设置表头居中

  HSSFCellStyle style = wb.createCellStyle();
  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 + 4);
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();
}
}


}