java-下载excel

在java程序里面处理excel,我觉得比较方便的方式是先做出一个excel的模板(比如定义表头信息、表格名称等),然后根据这个模板往里面填充数据

我这里演示的是使用poi处理2007以上版本的excel表格

代码：

String contextPath = session.getServletContext().getRealPath("/excel"); //获取模板路径
XSSFWorkbook workbook = new XSSFWorkbook(new FileInputStream(contextPath + "/schedule.xlsx")); //获取模板,并装成对应类
XSSFSheet sheet = workbook.getSheetAt(0); //获取第一张表格
int beginRow = 2;
int endRow = 2 + doctorVOs.size();
for(int i = 0;beginRow < endRow; beginRow++,i++){
                DoctorCountVO vo = doctorVOs.get(i);
                XSSFRow row = sheet.getRow(beginRow);
                if(row == null){
                    row = sheet.createRow(beginRow);
                    XSSFCell firstCell = row.createCell(0);
                    firstCell.setCellValue(vo.getDoctorName());

                    XSSFCell secondCell = row.createCell(1);
                    secondCell.setCellValue(vo.getOutCallFullDay());

                    XSSFCell thirdCell = row.createCell(2);
                    thirdCell.setCellValue(vo.getOutCallHalfDay());

                    XSSFCell forthCell = row.createCell(3);
                    forthCell.setCellValue(vo.getAccompanyFullDay());

                    XSSFCell fifthCell = row.createCell(4);
                    fifthCell.setCellValue(vo.getAccompanyHalfDay());
                }
            }
            ByteArrayOutputStream  os = new ByteArrayOutputStream();
            workbook.write(os);
            workbook.close();
            return os.toByteArray();

方法最后会放回byte[]数组,controller层通过response放回给客户端

byte[] bytes = scheduleService.userCountExport(contextPath, doctorVOs);
            if(bytes != null){
                response.setContentType("application/x-msdownload");
                response.setHeader("Content-Disposition", "attachment;filename=schedule.xlsx");
                response.setContentLength(bytes.length);
                response.getOutputStream().write(bytes);
                response.getOutputStream().flush();
                response.getOutputStream().close();
            }