java excel database data directly generate returns foreground downloads

Disclaimer: This article is a blogger original article, shall not be reproduced without the bloggers allowed. https://blog.csdn.net/sgl520lxl/article/details/82464988

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageImpl;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.mail.internet.MimeUtility;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


@RequestMapping(value = "/downloadexcel")
    public void downloadexcel(@RequestParam Map<String,String> reqPara, HttpServletResponse response, HttpServletRequest request){
        String BeginDate = reqPara.get("BeginDate");
        String EndDate = reqPara.get("EndDate");
        HashMap<String, Object> map = new HashMap<String, Object>();
       
        map.put("beginDate", BeginDate);
        map.put("endDate", EndDate);

        List<AniuAccountExtendXylm> list =  service.queryListByDate(map);
        if(list != null){
            // 开始输出到表格
            // 第一步，创建一个webbook，对应一个Excel文件
            HSSFWorkbook wb =null;
            HSSFSheet sheet=null;
            HSSFRow row;
                wb = new HSSFWorkbook();
                // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
                sheet = wb.createSheet("高校炒股大赛报名列表");
                //设置列宽
                sheet.setColumnWidth(0, 7000);
                sheet.setColumnWidth(1, 6500);
                sheet.setColumnWidth(2, 6500);
                sheet.setColumnWidth(3, 6500);
                sheet.setColumnWidth(4, 6500);
                sheet.setColumnWidth(5, 6500);
                sheet.setColumnWidth(6, 6500);
                sheet.setColumnWidth(7, 6500);
                sheet.setColumnWidth(8, 6500);

                // 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
                row = sheet.createRow((int) 0);

                //设置第一行颜色的style
                CellStyle style = wb.createCellStyle();
                style.setFillForegroundColor(IndexedColors.RED.getIndex());
                style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

                // 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.setCellStyle(style);
                cell.setCellValue("aniuuid");

                cell = row.createCell((short) 1);
                cell.setCellStyle(style);
                cell.setCellValue("学生名称");

                cell = row.createCell((short) 2);
                cell.setCellStyle(style);
                cell.setCellValue("学校");

                cell = row.createCell((short) 3);
                cell.setCellStyle(style);
                cell.setCellValue("手机号码");

                cell = row.createCell((short) 4);
                cell.setCellStyle(style);
                cell.setCellValue("专业");

                cell = row.createCell((short) 5);
                cell.setCellStyle(style);
                cell.setCellValue("年级");

                cell = row.createCell((short) 6);
                cell.setCellStyle(style);
                cell.setCellValue("报名时间");

                cell = row.createCell((short) 7);
                cell.setCellStyle(style);
                cell.setCellValue("老师aniuuid");

                cell = row.createCell((short) 8);
                cell.setCellStyle(style);
                cell.setCellValue("团队名称");

            for (int i = 0; i < list.size(); i++) {
                row = sheet.createRow(i+1);
                AniuAccountExtendXylm qu =  list.get(i);
                
                // 第四步，创建单元格，并设置值
                row.createCell((short) 0).setCellValue(qu.getAniuUid());
                row.createCell((short) 1).setCellValue(qu.getStudentName());
                row.createCell((short) 2).setCellValue(qu.getSchoolName());
                row.createCell((short) 3).setCellValue(qu.getMobile());
                row.createCell((short) 4).setCellValue(qu.getSpecialty());
                row.createCell((short) 5).setCellValue(qu.getGrade());
                row.createCell((short) 6).setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(qu.getInsertTime()));
                row.createCell((short) 7).setCellValue("");
                row.createCell((short) 8).setCellValue("");
            }
            try {
              
                String filename = "炒股大赛名单.xls";//设置下载时客户端Excel的名称
                filename = encodeFilename(filename, request);
                response.setContentType("application/vnd.ms-excel");
                response.setHeader("Content-disposition", "attachment;filename="+filename);
                OutputStream ouputStream = response.getOutputStream();
                wb.write(ouputStream);
                ouputStream.flush();
                ouputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

    }

public static String encodeFilename(String filename, HttpServletRequest request) {
        /**
         * 获取客户端浏览器和操作系统信息
         * 在IE浏览器中得到的是：User-Agent=Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; Alexa Toolbar)
         * 在Firefox中得到的是：User-Agent=Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.7.10) Gecko/20050717 Firefox/1.0.6
         */
        String agent = request.getHeader("USER-AGENT");
        try {
            if ((agent != null) && (-1 != agent.indexOf("MSIE"))) {
                String newFileName = URLEncoder.encode(filename, "UTF-8");
                newFileName = StringUtils.replace(newFileName, "+", "%20");
                if (newFileName.length() > 150) {
                    newFileName = new String(filename.getBytes("GB2312"), "ISO8859-1");
                    newFileName = StringUtils.replace(newFileName, " ", "%20");
                }
                return newFileName;
            }
            if ((agent != null) && (-1 != agent.indexOf("Mozilla")))
                return MimeUtility.encodeText(filename, "UTF-8", "B");

            return filename;
        } catch (Exception ex) {
            return filename;
        }
    }