导出excel，前后台代码示例

ExcelUtil工具类：
package com.leigod.NNN.base.util;

import org.apache.poi.hssf.usermodel.*;

import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

public class exportExcelUtil {


    //创建表头
    public void createTitle(HSSFWorkbook workbook, HSSFSheet sheet){
        HSSFRow row = sheet.createRow(0);
        //设置列宽，setColumnWidth的第二个参数要乘以256，这个参数的单位是1/256个字符宽度
        sheet.setColumnWidth(1,12*256);
        sheet.setColumnWidth(3,17*256);

        //设置为居中加粗
        HSSFCellStyle style = workbook.createCellStyle();
        HSSFFont font = workbook.createFont();
        font.setBold(true);
       // style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        style.setFont(font);

        HSSFCell cell;
        cell = row.createCell(0);
        cell.setCellValue("订单编号");
        cell.setCellStyle(style);

        cell = row.createCell(1);
        cell.setCellValue("昵称");
        cell.setCellStyle(style);

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

        cell = row.createCell(3);
        cell.setCellValue("类型");
        cell.setCellStyle(style);

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

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

        cell = row.createCell(6);
        cell.setCellValue("订单金额");
        cell.setCellStyle(style);

        cell = row.createCell(7);
        cell.setCellValue("实付金额");
        cell.setCellStyle(style);

        cell = row.createCell(8);
        cell.setCellValue("下单用户");
        cell.setCellStyle(style);

        cell = row.createCell(9);
        cell.setCellValue("下单用户ID");
        cell.setCellStyle(style);

        cell = row.createCell(10);
        cell.setCellValue("订单状态");
        cell.setCellStyle(style);

        cell = row.createCell(11);
        cell.setCellValue("订单生成时间");
        cell.setCellStyle(style);

        cell = row.createCell(12);
        cell.setCellValue("订单支付时间");
        cell.setCellStyle(style);

        cell = row.createCell(13);
        cell.setCellValue("接单时间");
        cell.setCellStyle(style);

        cell = row.createCell(14);
        cell.setCellValue("订单取消时间");
        cell.setCellStyle(style);

        cell = row.createCell(15);
        cell.setCellValue("订单完成时间");
        cell.setCellStyle(style);
    }

    //生成user表excel
  /*  @GetMapping(value = "/getUser")
    public String getUser(HttpServletResponse response) throws Exception{
        HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFSheet sheet = workbook.createSheet("统计表");
        createTitle(workbook,sheet);
        List rows = userService.getAll();

        //设置日期格式
        HSSFCellStyle style = workbook.createCellStyle();
        style.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));

        //新增数据行，并且设置单元格数据
        int rowNum=1;
        for(User user:rows){
            HSSFRow row = sheet.createRow(rowNum);
            row.createCell(0).setCellValue(user.getId());
            row.createCell(1).setCellValue(user.getName());
            row.createCell(2).setCellValue(user.getUsername());
            HSSFCell cell = row.createCell(3);
            cell.setCellValue(user.getCreate_time());
            cell.setCellStyle(style);
            rowNum++;
        }

        String fileName = "导出excel例子.xls";

        //生成excel文件
        buildExcelFile(fileName, workbook);

        //浏览器下载excel
        buildExcelDocument(fileName,workbook,response);

        return "download excel";
    }*/

    //生成excel文件
    public void buildExcelFile(String filename,HSSFWorkbook workbook) throws Exception{
        FileOutputStream fos = new FileOutputStream(filename);
        workbook.write(fos);
        fos.flush();
        fos.close();
    }

    //浏览器下载excel
    public void buildExcelDocument(String filename, HSSFWorkbook workbook, HttpServletResponse response) throws Exception{
        response.setContentType("application/vnd.ms-excel");
        response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode(filename, "utf-8"));
        OutputStream outputStream = response.getOutputStream();
        workbook.write(outputStream);
        outputStream.flush();
        outputStream.close();
    }

}

后台controller：

 

@ApiOperation(value = "导出excel")
   @RequestMapping(value = "/exportExcel", method = RequestMethod.GET, produces = "application/json;charset=utf-8")
   public Object exportExcel(HttpServletResponse response) throws Exception{
      exportExcelUtil exportexcelUtil = new exportExcelUtil();
      HSSFWorkbook workbook = new HSSFWorkbook();
      HSSFSheet sheet = workbook.createSheet("订单表");
      exportexcelUtil.createTitle(workbook,sheet);
      List list = orderMemberService.getOrderList(3, TransitionUtil.orderPlayerStatus(0), 0, null, null, "");

      //设置日期格式
      HSSFCellStyle style = workbook.createCellStyle();
      style.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));

      //新增数据行，并且设置单元格数据
      SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd HH:mm:ss");
      int rowNum=1;
      for(OrderObj orderObj:list){
         HSSFRow row = sheet.createRow(rowNum);
         if(!StringUtils.isEmpty(orderObj.getOrderNo())){
            row.createCell(0).setCellValue(orderObj.getOrderNo());
         }
         if(!StringUtils.isEmpty(orderObj.getGoodsName())){
            row.createCell(1).setCellValue(orderObj.getGoodsName());
         }
         if(!StringUtils.isEmpty(orderObj.getGoodsId())){
            row.createCell(2).setCellValue(orderObj.getGoodsId());
         }
         if(!StringUtils.isEmpty(orderObj.getGoodsSpecifica())){
            row.createCell(3).setCellValue(orderObj.getGoodsSpecifica());
         }
         if(!StringUtils.isEmpty(orderObj.getOrderPrice())){
            row.createCell(4).setCellValue(orderObj.getOrderPrice().toString());
         }
         if(!StringUtils.isEmpty(orderObj.getOrderNumber())){
            row.createCell(5).setCellValue(orderObj.getOrderNumber());
         }
         if(!StringUtils.isEmpty(orderObj.getOrderAmount())){
            row.createCell(6).setCellValue(orderObj.getOrderAmount().toString());
         }
         if(!StringUtils.isEmpty(orderObj.getPay())){
            row.createCell(7).setCellValue(orderObj.getPay().getPayAmount().toString());
         }
         if(!StringUtils.isEmpty(orderObj.getMemberNickName())){
            row.createCell(8).setCellValue(orderObj.getMemberNickName());
         }
         if(!StringUtils.isEmpty(orderObj.getStatusType())){
            row.createCell(9).setCellValue(orderObj.getMemberNo());
         }
         if(!StringUtils.isEmpty(orderObj.getStatusType())){
            row.createCell(10).setCellValue(orderObj.getStatusType());
         }
         if(!StringUtils.isEmpty(orderObj.getOrderTime())){
            row.createCell(11).setCellValue(sdf.format(orderObj.getOrderTime()));
         }
         if(!StringUtils.isEmpty(orderObj.getPaymentTime())){
            row.createCell(12).setCellValue(sdf.format(orderObj.getPaymentTime()));
         }
         if(!StringUtils.isEmpty(orderObj.getReceiptTime())){
            row.createCell(13).setCellValue(sdf.format(orderObj.getReceiptTime()));
         }
         if(!StringUtils.isEmpty(orderObj.getPaymentTime())){
            row.createCell(14).setCellValue(sdf.format(orderObj.getPaymentTime()));
         }
         if(!StringUtils.isEmpty(orderObj.getReceiptTime())){
            row.createCell(15).setCellValue(sdf.format(orderObj.getReceiptTime()));
         }
   }

elementUI，导出的事件：

exportExcel(){
  exportExcelAPI(this.formInline).then(res => {
    if(res.size > 0){
      const content = res
      const blob = new Blob([content])
      const fileName = '订单表.xlsx'
      if ('download' in document.createElement('a')) { // 非IE下载
        const elink = document.createElement('a')
        elink.download = fileName
        elink.style.display = 'none'
        elink.href = URL.createObjectURL(blob)
        document.body.appendChild(elink)
        elink.click()
        URL.revokeObjectURL(elink.href) // 释放URL 对象
        document.body.removeChild(elink)
      } else { // IE10+下载
        navigator.msSaveBlob(blob, fileName)
      }
     /* this.$message.success("导出成功")*/
    }
  }).catch(() => {
  });
},