java生成excel并转成字节流（需要为mysql中字段解码）

package com.mall.common.utils;

import com.mall.common.entities.ViewTradeRecordsEntity;
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 javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.List;
import java.util.UUID;

public class ExcelUtils {

    public static HSSFWorkbook createExcel(List viewTradeRecordsEntities,String fileSaveFolder,HttpServletResponse response) {
        HSSFWorkbook  wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("交易报表");
        // 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(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("序号");
        cell.setCellStyle(style);
        cell = row.createCell((short) 1);
        cell.setCellValue("店铺名称");
        cell.setCellStyle(style);
        cell = row.createCell((short) 2);
        cell.setCellValue("店铺房号");
        cell.setCellStyle(style);
        cell = row.createCell((short) 3);
        cell.setCellValue("楼层");
        cell.setCellStyle(style);
        cell = row.createCell((short) 4);
        cell.setCellValue("手机号");
        cell.setCellStyle(style);
        cell = row.createCell((short) 5);
        cell.setCellValue("会员名");
        cell.setCellStyle(style);
        cell = row.createCell((short) 6);
        cell.setCellValue("成交时间");
        cell.setCellStyle(style);
        cell = row.createCell((short) 7);
        cell.setCellValue("成交金额(元)");
        cell.setCellStyle(style);
        cell = row.createCell((short) 8);
        cell.setCellValue("积分");
        cell.setCellStyle(style);
        cell = row.createCell((short) 9);
        cell.setCellValue("状态");
        cell.setCellStyle(style);

        for (int i = 0; i < viewTradeRecordsEntities.size(); i++) {
            row = sheet.createRow((int) i + 1);
            //Member stu = (Member) list.get(i);
            // 第四步，创建单元格，并设置值
            row.createCell((short) 0).setCellValue(i);
            cell.setCellStyle(style);
            row.createCell((short) 1).setCellValue(viewTradeRecordsEntities.get(i).shopName);
            cell.setCellStyle(style);
            row.createCell((short) 2).setCellValue(viewTradeRecordsEntities.get(i).room);
            cell.setCellStyle(style);
            row.createCell((short) 3).setCellValue(viewTradeRecordsEntities.get(i).floor);
            cell.setCellStyle(style);
            row.createCell((short) 4).setCellValue(viewTradeRecordsEntities.get(i).mobile);
            cell.setCellStyle(style);
            if (viewTradeRecordsEntities.get(i).memberName!=null){
                try {
                    row.createCell((short) 5).setCellValue(java.net.URLDecoder.decode(viewTradeRecordsEntities.get(i).memberName,"UTF-8"));
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }else {
                row.createCell((short) 5).setCellValue(viewTradeRecordsEntities.get(i).memberName);
            }


            cell.setCellStyle(style);
            row.createCell((short) 6).setCellValue(viewTradeRecordsEntities.get(i).tradeTime);
            cell.setCellStyle(style);
            row.createCell((short) 7).setCellValue(viewTradeRecordsEntities.get(i).realAmount);
            cell.setCellStyle(style);
            if (viewTradeRecordsEntities.get(i).points == null) {
                String k = null;
                row.createCell((short) 8).setCellValue(k);
                cell.setCellStyle(style);
            } else {
                row.createCell((short) 8).setCellValue(viewTradeRecordsEntities.get(i).points + "");
                cell.setCellStyle(style);
            }
            if (viewTradeRecordsEntities.get(i).status == null) {
                String k = null;
                row.createCell((short) 8).setCellValue(k);
                cell.setCellStyle(style);
            } else {
                row.createCell((short) 9);
                cell.setCellValue(viewTradeRecordsEntities.get(i).status);
                cell.setCellStyle(style);
            }

        }
        // 第六步，将文件存到指定位置
        try {
            String urlname = UUID.randomUUID().toString();
            FileOutputStream fout = new FileOutputStream(fileSaveFolder + "/" + urlname + ".xls");
            wb.write(fout);
            byte[] buffer = new byte[1024];
            FileInputStream fis;
            BufferedInputStream bis;
            OutputStream os;
            os = response.getOutputStream();
            File file = new File(fileSaveFolder + "/" + urlname + ".xls");
            fis = new FileInputStream(file);
            bis = new BufferedInputStream(fis);
            int i = bis.read(buffer);
            while (i != -1) {
                os.write(buffer);
                i = bis.read(buffer);
            }
            os.close();
            bis.close();
            fis.close();
            fout.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return wb;
    }
}

 在这里由于我的mysql中member需要解码才能插入excel，所以加了

java.net.URLDecoder.decode(viewTradeRecordsEntities.get(i).memberName,"UTF-8")