简单实现利用java将数据写入到excel

import com.bdqn.demo.model.entity.User;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
* java to excel 导入appache的poi 3.15 jar 包
*/
public class MakeExcelTest {

// 产生要储存的集合
protected static List<User> getUsers() {
List<User> users = new ArrayList<>();
User user1 = new User("admin", "123456");
User user2 = new User("staff1", "141242");
User user3 = new User("staff2", "386002");
users.add(user1);
users.add(user2);
users.add(user3);
return users;
}

public static void main(String[] args) {
//第一步，创建一个workbook对应一个excel文件
HSSFWorkbook workbook = new HSSFWorkbook();
//第二部，在workbook中创建一个sheet对应excel中的sheet
HSSFSheet sheet = workbook.createSheet("用户表一");
//第三部，在sheet表中添加表头第0行，老版本的poi对sheet的行列有限制
HSSFRow row = sheet.createRow(0);
//第四步，创建单元格，设置表头
HSSFCell cell = row.createCell(0);
cell.setCellValue("用户名");
cell = row.createCell(1);
cell.setCellValue("密码");

//第五步，写入实体数据，实际应用中这些数据从数据库得到,对象封装数据，集合包对象。对象的属性值对应表的每行的值
List<User> users = getUsers();
for (int i = 0; i < users.size(); i++) {
HSSFRow row1 = sheet.createRow(i + 1);
User user = users.get(i);
//创建单元格设值
row1.createCell(0).setCellValue(user.getUsername());
row1.createCell(1).setCellValue(user.getPassword());
}

//将文件保存到指定的位置
try {
FileOutputStream fos = new FileOutputStream("E:\\user1.xls");
workbook.write(fos);
System.out.println("写入成功");
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}