数据库数据导入Excel表

package com.joyveb.export.action;

import java.io.FileOutputStream;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.ResultSet;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class MySql2Excel {
public MySql2Excel() throws Exception {
Connection con = null;
DBConnection db = new DBConnection();
con = db.getDB();
String sql = "select * from t_students";
ResultSet rs = con.createStatement().executeQuery(sql);
// 获取总列数
int CountColumnNum = rs.getMetaData().getColumnCount();
int i = 1;
// 创建Excel文档
HSSFWorkbook wb = new HSSFWorkbook();
// sheet 对应一个工作页
HSSFSheet sheet = wb.createSheet("student表中的数据");
HSSFRow firstrow = sheet.createRow(0); // 下标为0的行开始
HSSFCell[] firstcell = new HSSFCell[CountColumnNum];
String[] names = new String[CountColumnNum];
names[0] = "ID";
names[1] = "学号";
names[2] = "姓名";
names[3] = "性别";
names[4] = "班级";
for (int j = 0; j < CountColumnNum; j++) {
firstcell[j] = firstrow.createCell((short) j);
firstcell[j].setCellValue(new HSSFRichTextString(names[j]));
}
while (rs.next()) {
// 创建电子表格的一行
HSSFRow row = sheet.createRow(i); // 下标为1的行开始
for (int j = 0; j < CountColumnNum; j++) {
// 在一行内循环
HSSFCell cell = row.createCell((short) j);
// 设置表格的编码集，使支持中文
// // 先判断数据库中的数据类型
// 将结果集里的值放入电子表格中
cell.setCellValue(new HSSFRichTextString(rs.getString(j + 1)));
}
i++;
}
// 创建文件输出流，准备输出电子表格
OutputStream out = new FileOutputStream("E:\\person.xls");
wb.write(out);
out.close();
System.out.println("数据库导出成功");
rs.close();
con.close();
}

public static void main(String[] args) {

try {
@SuppressWarnings("unused")
MySql2Excel excel = new MySql2Excel();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}