不是從InputStream中read，然後outputStream再write

@RequestMapping("download4Excel")
    public void download4Excel(HttpServletResponse response){
        XSSFWorkbook workbook = new XSSFWorkbook();
        XSSFSheet sheet = workbook.createSheet("測試Sheet");
        
        sheet.setColumnWidth(1, 7000);
        Row row 
 
= sheet.createRow(0);
        Cell cell = row.createCell(1);
        cell.setCellValue("德瑪西亞");
        
        
        try {
            
            response.setContentType("multipart/form-data");
            response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode("測試生成Excel文件.xlsx", "utf-8"));
            OutputStream outputStream 
 
= response.getOutputStream();
            workbook.write(outputStream);
            outputStream.close();
            workbook.close();
            
        } catch (UnsupportedEncodingException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (IOException e) {
            
 
// TODO Auto-generated catch block
            e.printStackTrace();
        } 
        
    }

【POI】導出excel文件，不生成中間文件，直接將內存中的數據創建對象下載到瀏覽器