springMVC 导出Excel ，并提供下载（处理日期格式问题）

1、POI的三个依赖

2、控制层代码

3、业务层代码

4、参考文献：

1、POI的三个依赖

<!-- POI的三个依赖 --><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>4.1.2</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml-schemas</artifactId><version>4.1.2</version></dependency><!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml --><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>4.1.2</version></dependency>

2、控制层代码

@RequestMapping("/exportExcel.ctrl")@ResponseBodyResponseEntity<byte[]> exportExcel(PlcFirst record) throws UnsupportedEncodingException {return plcFirstService.exportExcel(record);}

3、业务层代码

    public ResponseEntity<byte[]> exportExcel(PlcFirst record) throws UnsupportedEncodingException {//1、 根据条件查询需要的数据List<PlcFirst> list = plcFirstMapper.selectPage2(record);//2、创建一个excel并写入内容HSSFWorkbook workbook=new HSSFWorkbook();HSSFSheet sheet=workbook.createSheet("Sheet1");//3、填写表头HSSFRow row=sheet.createRow(0);HSSFCell cell=row.createCell(0);cell.setCellValue("序列号");HSSFCell cell1=row.createCell(1);cell1.setCellValue("工序号");HSSFCell cell2=row.createCell(2);cell2.setCellValue("扭矩");HSSFCell cell3=row.createCell(3);cell3.setCellValue("角度");HSSFCell cell4=row.createCell(4);cell4.setCellValue("OK/NG");HSSFCell cell5=row.createCell(5);cell5.setCellValue("工具号");HSSFCell cell6=row.createCell(6);cell6.setCellValue("打印码");HSSFCell cell7=row.createCell(7);cell7.setCellValue("创建时间");// 创建日期格式的单元格格式DataFormat dataFormat = workbook.createDataFormat();CellStyle cellStyle = workbook.createCellStyle();cellStyle.setDataFormat(dataFormat.getFormat("yyyy-MM-dd HH:mm:ss"));// 4、遍历数据，并写入Excel。int i=1;for (PlcFirst plc : list) {HSSFRow rowi = sheet.createRow(i++);rowi.createCell(0).setCellValue(plc.getSerNo());rowi.createCell(1).setCellValue(plc.getGongXuHao());rowi.createCell(2).setCellValue(plc.getNiuJu());rowi.createCell(3).setCellValue(plc.getJiaoDu());rowi.createCell(4).setCellValue(plc.getOkNg());rowi.createCell(5).setCellValue(plc.getGongJuHao());rowi.createCell(6).setCellValue(plc.getDaYinMa());HSSFCell cell77 = rowi.createCell(7);cell77.setCellValue(plc.getCreateTime());// 设置单元格格式为日期格式cell77.setCellStyle(cellStyle);}// EEEEE//创建一个字节数组输出流对象ByteArrayOutputStream outputStream=new ByteArrayOutputStream();try {//将excel写入输出流workbook.write(outputStream);workbook.close();} catch (IOException e) {e.printStackTrace();}HttpHeaders headers=new HttpHeaders();String fileName=new String("excel.xls".getBytes("UTF-8"),"iso-8859-1");headers.setContentDispositionFormData("attachment", fileName);headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);ResponseEntity<byte[]> returnFile=new ResponseEntity<byte[]>(outputStream.toByteArray(),headers,HttpStatus.CREATED);try {outputStream.close();} catch (IOException e) {e.printStackTrace();}return returnFile;}