两种POI导出方式（1有好几个sheet 2 正常样式）

 

//获取数据
		//List<User> users = userService.selectUsers();
		List<User> users =new ArrayList<User>();
		User a=new User(1,"aabbbbbbbbbbbbbbbbbbbbbb","aaa");
		User b=new User(2,"bb","bbb");
		users.add(a);
		users.add(b);
		
		

		HSSFWorkbook wb = new HSSFWorkbook();
		HSSFSheet sheet = wb.createSheet("获取excel测试表格");
		HSSFRow row = null;


		//第一行
		//设置样式（标题样式）
		HSSFCellStyle style = wb.createCellStyle();
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中 
		style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
		/*style.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index);
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);*/
		//设置字体
		HSSFFont font = wb.createFont();
		font.setColor(HSSFColor.RED.index);
		font.setFontName("黑体");
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗体显示  
		font.setFontHeightInPoints((short) 25);
		style.setFont(font);
		//合并单元格
		Region mergeRegion3638 = new Region(0, (short) 0, 0, (short) 2);
		sheet.addMergedRegion(mergeRegion3638);
		sheet.autoSizeColumn((short) 1); 
  
		
		row = sheet.createRow(0);//创建第一个单元格
		row.setHeight((short) (26.25 * 20));
		HSSFCell cell = row.createCell((short) 0);
        cell.setCellStyle(style);
        cell.setCellValue("用户信息列表");

	
        //第二行
        //设置样式（表头）
		HSSFCellStyle cellStyleHead = wb.createCellStyle();
		HSSFFont font1 = wb.createFont();
		font1.setFontHeightInPoints((short) 12);
		font1.setColor(HSSFColor.RED.index);
		font1.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		font1.setFontName("黑体");
		font1.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗体显示
		cellStyleHead.setFont(font1);
		
		
		int rowIndex = 1;
		int colIndex = 0;
		row = sheet.createRow(rowIndex++);
		cell = row.createCell((short) colIndex++);

		String[] headTitles = { "第1列头部", "第2列头部", "第3列头部" };
		for (int i = 0; i < headTitles.length; i++) {
			cell = row.createCell((short) i);
			cell.setCellStyle(cellStyleHead);
			cell.setCellValue(new HSSFRichTextString(headTitles[i]));
		}

		
		//第三行往后
		//设置样式（文本）
		HSSFCellStyle cellStyleContent = wb.createCellStyle();
		HSSFFont font2 = wb.createFont();
		font2.setFontHeightInPoints((short) 10);
		font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
		cellStyleContent.setFont(font2);
		
		for (int i = 0; i < users.size(); i++) {
			row = sheet.createRow(i + 2);
			User user = users.get(i);
			row.createCell((short) 0).setCellValue(user.getId());
			row.createCell((short) 1).setCellValue(user.getUsername());
			row.createCell((short) 2).setCellValue(user.getPassword());
		}
		sheet.setDefaultRowHeight((short) (20 * 40));
		//列宽自适应
		for (int i = 0; i <= 13; i++) {
			sheet.autoSizeColumn((short) i);
		}

		response.setContentType("application/vnd.ms-excel;charset=utf-8");
		response.setHeader("Content-disposition", "attachment;filename=12345.xls");//默认Excel名称
		response.setCharacterEncoding("utf-8");
		OutputStream os = response.getOutputStream();
		wb.write(os);
		os.flush();
		os.close();

=================================

package com.poi.testpoi.controller;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

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.HSSFRichTextString;
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.util.HSSFColor;
import org.apache.poi.hssf.util.Region;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@RequestMapping("/system1")
@Controller
public class exportController {

	@RequestMapping(value = "/export" ,method=RequestMethod.GET)
	@ResponseBody
	public void export(HttpServletResponse response) throws IOException {
		String fileName = "e://"+System.currentTimeMillis()+".xls";
        String[] header = new String[]{"经销商", "年卡号", "激活码"};
        List<String> listAgent = new ArrayList<String>();
        listAgent.add("steven");
        listAgent.add("peter");
        listAgent.add("vactor");
        // 导出到多个sheet中--------------------------------------------------------------------------------开始
        // 创建一个EXCEL
        HSSFWorkbook wb = new HSSFWorkbook();
        // 循环经销商，每个经销商一个sheet
        for (int i = 0; i < listAgent.size(); i++)
        {
            // 第 i 个sheet,以经销商命名
            HSSFSheet sheet = wb.createSheet(listAgent.get(i).toString());
            //第一行前三个单元格合并（参数1：行号 参数2：起始列号 参数3：行号 参数4：终止列号）
            Region region1 = new Region(0, (short) 0,(short)0,(short)2);
            sheet.addMergedRegion(region1);
            HSSFRow row1 = sheet.createRow(0);
            HSSFCell cell1 = row1.createCell((short) 0);
            HSSFCell cell2 = row1.createCell((short)1);
            HSSFCell cell3 = row1.createCell((short)2);
            cell1.setCellValue("第一行设置标题");
            //单元格 设置样式     ----
            HSSFCellStyle cellStyle = wb.createCellStyle();
            cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中
            cellStyle.setFillForegroundColor((short) 13);// 设置背景色
            //设置字体
            HSSFFont font = wb.createFont();
            font.setFontName("仿宋_GB2312");
            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗体显示
            font.setFontHeightInPoints((short) 12);
            cellStyle.setFont(font);//字体设置应用到设置的格式上
            //使 设置的样式生效（设置的格式应用到单元格上）
            cell1.setCellStyle(cellStyle);
            cell2.setCellStyle(cellStyle);
            /**      ^
             *
             *
             */
            cell3.setCellStyle(cellStyle);
            // 第i个sheet第二行为列名
            HSSFRow rowFirst = sheet.createRow(1);
            // 写标题
            for (int j = 0; j < header.length; j++)
            {
                // 获取第一行的每一个单元格
                HSSFCell cell = rowFirst.createCell((short) j);
                // 往单元格里面写入值
                cell.setCellValue(header[j]);
            }
            // 循环该经销商下的卡(为每一个sheet准备数据)
            // List<StudyCard> lst = study_cardService.list(paramMap, null);
            List<Map<String, Object>> lst = new ArrayList<Map<String, Object>>();
            // 循环添加测试数据
            for (int j = 0; j < 10; j++)
            {
                Map<String, Object> data = new HashMap<String, Object>(3);
                data.put("agent", listAgent.get(i).toString() + j);
                data.put("card_no", "card" + j);
                data.put("password", "password" + j);
                lst.add(data);
            }
            System.out.println(lst);//三个list，list中每一行是个map[{card_no=card0, agent=steven0, password=password0}, {card_no=card1, agent=steven1, password=password1}]
            for (int j = 0; j < lst.size(); j++)
            {
                Map<?, ?> map = (Map<?, ?>) lst.get(j);
                // 创建数据行，从第三行开始
                HSSFRow row = sheet.createRow(j + 2);
                // 设置对应单元格的值
                row.createCell((short)0).setCellValue(map.get("agent").toString());
                row.createCell((short)1).setCellValue(map.get("card_no").toString());
                row.createCell((short)2).setCellValue(map.get("password").toString());
            }
        }
        // 写出文件（path为文件路径含文件名）
        OutputStream os = null;
        try
        {
            os = new FileOutputStream(new File(fileName));
            wb.write(os);
            System.out.println("文件导出成功，请前往查看.....\n" + fileName);
        }
        catch (Exception e)
        {
            System.out.println("我擦，导出文件居然出错了.....\n" + e.getMessage());
        }
        finally
        {
            os.flush();
            os.close();
        }
        // 导出到多个sheet中---------------------------------------------------------------------------------结束

}
}