JAVA web项目返回excel文件的方法

服务端代码：记得引poi3.8的包

@RequestMapping("exportFile")
    public void exportFile(HttpServletRequest request, HttpServletResponse response){
        try{
            //设置返回值信息
            String fileName = "findMedicine.xlsx";
            String filePath = request.getSession().getServletContext().getRealPath("/")+"WebSource/file/"+fileName;
            response.setContentType("multipart/form-data");
            response.setHeader("Content-Disposition", "attachment;fileName=" + "export_all.xlsx");
            InputStream inputStream = new FileInputStream(filePath);
            Workbook workbook = new XSSFWorkbook(inputStream);
            OutputStream outputStream = response.getOutputStream();
            inputStream.close();
            //在这一步之前可以对workbook赋值，它只是一个excel文件对象，可以用代码赋值写入你想要的excel数据
            workbook.write(outputStream);
            outputStream.close();
            outputStream.flush();
        }catch (Exception e){
            logger.error("----exportFile error----",e);
        }
    }