SpringMVC生成Excel下载
SpringMVC controller里的方法:
@RequestMapping(value="/notify/download",produces = {"application/vnd.ms-excel;charset=UTF-8"}) public String download(HttpSession session,HttpServletResponse response){ try { User user= (User) session.getAttribute("user"); String queryParam=""; if (!user.getRole().getName().equals("超级管理员")){ queryParam+=" and sbn.be_notified_user_id = "+user.getId(); } List<Notify> notifyList=slDao.getNotifyList(queryParam,0,999999999); String fileName="纠错统计表"; List<Map<String,Object>> list=createExcelRecord(notifyList); String columnNames[]={"发起纠错时间","纠错人","负责人","标准库名","纠错内容","纠错状态"};//列名 String keys[] = {"time","notifyUser","beNotifiedUser","standardName","content","finish"};//map中的key ByteArrayOutputStream os = new ByteArrayOutputStream(); try { ExcelUtil.createWorkBook(list,keys,columnNames).write(os); } catch (IOException e) { e.printStackTrace(); } byte[] content = os.toByteArray(); InputStream is = new ByteArrayInputStream(content); // 设置response参数,可以打开下载页面 response.reset(); response.setContentType("application/vnd.ms-excel;charset=utf-8"); response.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xls").getBytes(), "iso-8859-1")); ServletOutputStream out = response.getOutputStream(); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { bis = new BufferedInputStream(is); bos = new BufferedOutputStream(out); byte[] buff = new byte[2048]; int bytesRead; // Simple read/write loop. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead); } } catch (final IOException e) { throw e; } finally { if (bis != null) bis.close(); if (bos != null) bos.close(); } }catch (Exception e){ } return null; }
所调用的createExcelRecord方法
private List<Map<String, Object>> createExcelRecord(List<Notify> notifyList) { List<Map<String, Object>> listmap = new ArrayList<Map<String, Object>>(); Map<String, Object> map = new HashMap<String, Object>(); map.put("sheetName", "sheet1"); listmap.add(map); for (int j = 0; j < notifyList.size(); j++) { Notify notify=notifyList.get(j); Map<String, Object> mapValue = new HashMap<String, Object>(); mapValue.put("time", notify.getTime()); mapValue.put("notifyUser",notify.getNotifyUserNickname()); mapValue.put("beNotifiedUser",notify.getBeNotifiedUserNickname()); mapValue.put("standardName",notify.getStandardName()); mapValue.put("content",notify.getContent()); String finish=notify.getFinishFlag()+""; if (finish.equals("0")) finish="已纠错"; else finish="未纠错"; mapValue.put("finish",finish); listmap.add(mapValue); } return listmap; }
所调用的ExcelUtil
public class ExcelUtil { /** * 创建excel文档, * list 数据 * @param keys list中map的key数组集合 * @param columnNames excel的列名 * */ public static Workbook createWorkBook(List<Map<String, Object>> list, String []keys, String columnNames[]) { // 创建excel工作簿 Workbook wb = new HSSFWorkbook(); // 创建第一个sheet(页),并命名 Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString()); // 手动设置列宽。第一个参数表示要为第几列设;,第二个参数表示列的宽度,n为列高的像素数。 for(int i=0;i<keys.length;i++){ sheet.setColumnWidth((short) i, (short) (35.7 * 200)); } // 创建第一行 Row row = sheet.createRow((short) 0); // 创建两种单元格格式 CellStyle cs = wb.createCellStyle(); CellStyle cs2 = wb.createCellStyle(); // 创建两种字体 Font f = wb.createFont(); Font f2 = wb.createFont(); // 创建第一种字体样式(用于列名) f.setFontHeightInPoints((short) 10); f.setColor(IndexedColors.BLACK.getIndex()); f.setBoldweight(Font.BOLDWEIGHT_BOLD); // 创建第二种字体样式(用于值) f2.setFontHeightInPoints((short) 10); f2.setColor(IndexedColors.BLACK.getIndex()); // Font f3=wb.createFont(); // f3.setFontHeightInPoints((short) 10); // f3.setColor(IndexedColors.RED.getIndex()); // 设置第一种单元格的样式(用于列名) cs.setFont(f); cs.setBorderLeft(CellStyle.BORDER_THIN); cs.setBorderRight(CellStyle.BORDER_THIN); cs.setBorderTop(CellStyle.BORDER_THIN); cs.setBorderBottom(CellStyle.BORDER_THIN); cs.setAlignment(CellStyle.ALIGN_CENTER); // 设置第二种单元格的样式(用于值) cs2.setFont(f2); cs2.setBorderLeft(CellStyle.BORDER_THIN); cs2.setBorderRight(CellStyle.BORDER_THIN); cs2.setBorderTop(CellStyle.BORDER_THIN); cs2.setBorderBottom(CellStyle.BORDER_THIN); cs2.setAlignment(CellStyle.ALIGN_CENTER); //设置列名 for(int i=0;i<columnNames.length;i++){ Cell cell = row.createCell(i); cell.setCellValue(columnNames[i]); cell.setCellStyle(cs); } //设置每行每列的值 for (short i = 1; i < list.size(); i++) { // Row 行,Cell 方格 , Row 和 Cell 都是从0开始计数的 // 创建一行,在页sheet上 Row row1 = sheet.createRow((short) i); // 在row行上创建一个方格 for(short j=0;j<keys.length;j++){ Cell cell = row1.createCell(j); cell.setCellValue(list.get(i).get(keys[j]) == null?" ": list.get(i).get(keys[j]).toString()); cell.setCellStyle(cs2); } } return wb; } }
所需要引用的maven包:
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.15</version> </dependency>