vue java后台导出Excel 兼容ie

//js
export function exportExcel(params,url) {
  let form = document.createElement("form")
  let  cloneObj=function(obj) {
    let newObj = {};
    if (obj instanceof Array) {
      newObj = [];
    }
    for (let key in obj) {
      let val = obj[key];
      newObj[key] = typeof val === 'object' ? cloneObj(val): val;
    }
    return newObj;
  }
  let submitParams = cloneObj(params);
  form.style.display = 'none'
  form.action = process.env.VUE_APP_BASE_API + url
  form.method = "post"
  form.target="_blank"
  document.body.appendChild(form)
  for(let key in submitParams){
    let input = document.createElement("input")
    input.type = "hidden"
    input.name = key
    input.value = submitParams[key]
    form.appendChild(input)
  }
  form.submit()
  form.remove()
}

//java

    @RequestMapping("/getExcel.do")
    @ResponseBody
    public void getStartEndExcel(HttpServletRequest request, HttpServletResponse response) throws Exception{
        String reportDate = request.getParameter("reportDateStr");
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");
        String year = reportDate.substring(0,4);
        String month = reportDate.substring(4, 6);
        reportDate=StringUtils.isBlank(reportDate)?sdf.format(new Date()):reportDate;
        List  list = this.getlist(reportDate,year,month);
        String[] headers = {"beanName","beanName","beanName","beanName","beanName","beanName","beanName","beanName","beanName"};

        Workbook book  = new HSSFWorkbook(ExcelUtil.getExcelFile("excelmodel/Excel.xls"));
        Sheet sheet = book.getSheetAt(0);
        Row excelRow = sheet.getRow(0);
        String fileName = "表("+reportDate+")";
        CellStyle TitleStyle = ExcelUtil.getCellStyle(book, (short)26, true, true, true,true);
        CellStyle cellStyle = ExcelUtil.getCellStyle(book, (short)10, false, true, true,true);
        ExcelUtil.createCellAndSetValue(excelRow, TitleStyle, 0, fileName);
        this.commonStringExcelSetCellValue(sheet, cellStyle, 3, list, headers, false);
        this.commonResponseWrite(response, fileName, book);
    }

protected void commonStringExcelSetCellValue(Sheet sheet, CellStyle cellStyle, int rowIdx, List list, String[] fields, boolean needIndex, Integer inputIndex){
        int index = inputIndex == null?1:inputIndex;
        DozerBeanMapper dozerBeanMapper = RuntimeApplicationContext.getBean(DozerBeanMapper.class);
        for (Object obj : list) {
            Map map = null;
            if (obj instanceof Map) {
                map = (Map) obj;
            } else {
                map = dozerBeanMapper.map(obj, Map.class);
            }
            Row row = sheet.createRow(rowIdx++);
            int colIdx=0;
            for (int i = 0; i < fields.length; i++) {
                Cell cell = row.createCell(i);
                cell.setCellStyle(cellStyle);
                Object value; 
                if(i==0 && needIndex) {
                    value = index++;
                }else {
                    value = map.get(fields[i]);
                    if ("null".equals(value)||value==null) {
                        value = "";
                    }
                }
                if (value instanceof BigDecimal) {
                    cell.setCellValue(((BigDecimal)value).doubleValue());
                }else if(value instanceof Integer){
                    cell.setCellValue(((Integer)value).doubleValue());
                }else{
                    cell.setCellValue(""+value);
                }
            }
        }
    }

    
    protected void commonResponseWrite(HttpServletResponse response, String fileName, Workbook book) throws Exception {
        OutputStream out;
        fileName = new String(fileName.getBytes(),"ISO8859-1");  
        response.setContentType("application/x-msdownload");
        response.setHeader("Content-Disposition", "attachment;filename="+fileName+".xls");
        out = response.getOutputStream();
        book.write(out);
        out.flush();
        out.close();
    }