使用Apache POI 实现导出数据到Excel 并下载到本地

参考地址： http://www.cnblogs.com/bmbm/archive/2011/12/08/2342261.html

感谢这位大神

1.首先下载poi-3.6-20091214.jar，下载地址如下：

http://download.csdn.net/detail/evangel_z/3895051

2.Student.java

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)

public String getName()

return name;

public void setName(String name)

public int getAge()

return age;

public void setAge(int age)

public Date getBirth()

return birth;

public void setBirth(Date 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 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 = row.createCell((short) 2);

cell.setCellValue("年龄");

cell = row.createCell((short) 3);

cell.setCellValue("生日");

// 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.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();

-------------------------我是华丽的分割线------------------------------

下面实现下载功能：

HttpServletResponse response = ServletActionContext.getResponse();

File file = new File(path);// path是根据日志路径和文件名拼接出来的

String filename = file.getName();// 获取日志文件名称

InputStream fis = new BufferedInputStream(new FileInputStream(path));

byte[] buffer = new byte[fis.available()];

fis.read(buffer);

fis.close();

response.reset();

// 先去掉文件名称中的空格,然后转换编码格式为utf-8,保证不出现乱码,这个文件名称用于浏览器的下载框中自动显示的文件名

response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.replaceAll(" ", "").getBytes("utf-8"),"iso8859-1"));

response.addHeader("Content-Length", "" + file.length());

OutputStream os = new BufferedOutputStream(response.getOutputStream());

response.setContentType("application/octet-stream");

os.write(buffer);// 输出文件

os.flush();

os.close();