一、导入maven依赖包

 <dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml-schemas</artifactId><version>4.1.2</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>4.1.2</version></dependency>

二、案例代码

public void exportExcel(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {/*** 创建一个Excel文件*/HSSFWorkbook workbook = new HSSFWorkbook();/*** 创建一个sheet*/HSSFSheet sheet = workbook.createSheet("员工表一");/*** 在sheet表中添加0行*/HSSFRow row = sheet.createRow(0);/*** 创建单元格，设置表头*/HSSFCell cell = row.createCell(0);cell.setCellValue("员工工号");cell = row.createCell(1);cell.setCellValue("省份证号");cell = row.createCell(2);cell.setCellValue("姓名");cell = row.createCell(3);cell.setCellValue("性别");cell = row.createCell(4);cell.setCellValue("出生日期");cell = row.createCell(5);cell.setCellValue("联系方式");cell = row.createCell(6);cell.setCellValue("家庭地址");cell = row.createCell(7);cell.setCellValue("担任职务");cell = row.createCell(8);cell.setCellValue("角色名称");cell = row.createCell(9);cell.setCellValue("所属科室");/***  把list集合里面的数据写入工作表*/List<Doctor> list = doctorService.findAll();SimpleDateFormat simpleDateFormat = new SimpleDateFormat("YYYY-MM-dd");for (int i = 0; i < list.size(); i++) {/*** 创建行*/HSSFRow row1 = sheet.createRow(i + 1);Doctor doctor = list.get(i);/***  为单元格写入值，从0开始*/row1.createCell(0).setCellValue(doctor.getDocid());row1.createCell(1).setCellValue(doctor.getIdcard());row1.createCell(2).setCellValue(doctor.getDocname());row1.createCell(3).setCellValue(doctor.getDocsex());row1.createCell(4).setCellValue(simpleDateFormat.format(doctor.getDocbirthday()));row1.createCell(5).setCellValue(doctor.getDocphone());row1.createCell(6).setCellValue(doctor.getDocaddress());row1.createCell(7).setCellValue(doctor.getDuty());row1.createCell(8).setCellValue(doctor.getRolename());row1.createCell(9).setCellValue(doctor.getDptname());}File file = new File("E://hospital//doctor.xls");if (file.exists()) {file.delete();}/*** 将文件保存到指定的位置*/try {file.createNewFile();workbook.write(file);System.out.println("导出到成功");System.out.println("默认位置：E://hospital//doctor.xls");workbook.close();} catch (IOException e) {e.printStackTrace();}request.setAttribute("msg","导出成功--已保存到：E://hospital//doctor.xls");request.getRequestDispatcher("/success.jsp").forward(request, response);}

三、运行截图