poi导出excel

方法一：

package com.cz.poi;
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;
	}

}

 

package com.cz.poi;
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 ExcelExport
{
	/**
	 * @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 = ExcelExport.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 = 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();
		}
	}
}

 方法二：

package com.cz.test;

import java.io.FileOutputStream;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;

import javax.swing.JOptionPane;

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;

import com.cz.util.SqlHelper;

public class ExcelExport2 {
	
	public static void resultSetToExcel(ResultSet rs, String xlsName,
			String sheetName) 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;
		ResultSetMetaData md = rs.getMetaData();
		int nColumn = md.getColumnCount();
		// 写入各个字段的名称
		for (int i = 1; i <= nColumn; i++) {
			cell = row.createCell((short) (i - 1));
			cell.setCellType(HSSFCell.CELL_TYPE_STRING);
			cell.setCellValue(md.getColumnLabel(i));
		}

		int iRow = 1;
		// 写入各条记录，每条记录对应Excel中的一行
		while (rs.next()) {
			row = sheet.createRow((short) iRow);
			for (int j = 1; j <= nColumn; j++) {
				cell = row.createCell((short) (j - 1));
				cell.setCellType(HSSFCell.CELL_TYPE_STRING);
				cell.setCellValue(rs.getObject(j).toString());
			}
			iRow++;
		}
		FileOutputStream fOut = new FileOutputStream(xlsName);
		wb.write(fOut);
		fOut.flush();
		fOut.close();
		JOptionPane.showMessageDialog(null, "导出数据成功！");
	}

	public static void main(String[] args) {
		String sql="select * from dept";
		ResultSet rs=SqlHelper.executeQuery(sql, null);
		try {
			resultSetToExcel(rs, "F:\\dept.xls","sheetName");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}