Apache POI 是创建和维护操作各种符合Office Open XML(OOXML)标准和微软的OLE 2复合文档格式(OLE2)的Java API。用它可以使用Java读取和创建,修改MS Excel文件.而且,还可以使用Java读取和创建MS Word和MSPowerPoint文件。Apache POI 提供Java操作Excel解决方案(适用于Excel97-2008)。
简单理解就是通过 POI , java 可以与 office 建立联系。
本次项目实践基于 SSM 框架,简单封装了 Excel 批量导入导出功能,实现过程如下
1. maven 导入 java 包:
[html] view plain copy
org.apache.poi poi-ooxml 3.5-FINAL
2. 建立 Excel 实体-- ExcelBean
[java] view plain copy
/** * * @Description: 导入导出excel * @author haipeng * @date 2017年4月11日 */ public class ExcelBean implements java.io.Serializable { private String headTextName;//列头(标题)名 private String propertyName;//对应字段名 private Integer cols;//合并单元格数 private XSSFCellStyle cellStyle; public ExcelBean(){ } public ExcelBean(String headTextName, String propertyName){ this.headTextName = headTextName; this.propertyName = propertyName; } public ExcelBean(String headTextName, String propertyName, Integer cols) { super(); this.headTextName = headTextName; this.propertyName = propertyName; this.cols = cols; } public String getHeadTextName() { return headTextName; } public void setHeadTextName(String headTextName) { this.headTextName = headTextName; } public String getPropertyName() { return propertyName; } public void setPropertyName(String propertyName) { this.propertyName = propertyName; } public Integer getCols() { return cols; } public void setCols(Integer cols) { this.cols = cols; } public XSSFCellStyle getCellStyle() { return cellStyle; } public void setCellStyle(XSSFCellStyle cellStyle) { this.cellStyle = cellStyle; } }
封装Excel工具类—ExcelUtils
[java] view plain copy
public class ExcelUtils { private final static String excel2003L =”.xls”; //2003- 版本的excel private final static String excel2007U =”.xlsx”; //2007+ 版本的excel /*************************************文件上传****************************/ public static List> getBankListByExcel(InputStream in,String fileName) throws Exception{
List> list = null;
//创建Excel工作薄 Workbook work = getWorkbook(in,fileName); if(null == work){ throw new Exception(“创建Excel工作薄为空!”); } Sheet sheet = null; Row row = null; Cell cell = null; list = new ArrayList>();
//遍历Excel中所有的sheet for (int i = 0; i < work.getNumberOfSheets(); i++) { sheet = work.getSheetAt(i); if(sheet==null){ continue;} //遍历当前sheet中的所有行 for (int j = sheet.getFirstRowNum(); j < sheet.getLastRowNum(); j++) { row = sheet.getRow(j); if(row==null||row.getFirstCellNum()==j){ continue;} //遍历所有的列 List li = new ArrayList(); for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) { cell = row.getCell(y); li.add(getCellValue(cell)); } list.add(li); } } // work.close(); return list; } /** * 描述:根据文件后缀,自适应上传文件的版本 * @param inStr,fileName * @return * @throws Exception */ public static Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{ Workbook wb = null; String fileType = fileName.substring(fileName.lastIndexOf(“.”)); if(excel2003L.equals(fileType)){ wb = new HSSFWorkbook(inStr); //2003- }else if(excel2007U.equals(fileType)){ wb = new XSSFWorkbook(inStr); //2007+ }else{ throw new Exception(“解析的文件格式有误!”); } return wb; } /** * 描述:对表格中数值进行格式化 * @param cell * @return */ public static Object getCellValue(Cell cell){ Object value = null; DecimalFormat df = new DecimalFormat(“0”); //格式化number String字符 SimpleDateFormat sdf = new SimpleDateFormat(“yyy-MM-dd”); //日期格式化 DecimalFormat df2 = new DecimalFormat(“0.00”); //格式化数字 switch (cell.getCellType()) { case Cell.CELL_TYPE_STRING: value = cell.getRichStringCellValue().getString(); break; case Cell.CELL_TYPE_NUMERIC: if(“General”.equals(cell.getCellStyle().getDataFormatString())){ value = df.format(cell.getNumericCellValue()); }else if(“m/d/yy”.equals(cell.getCellStyle().getDataFormatString())){ value = sdf.format(cell.getDateCellValue()); }else{ value = df2.format(cell.getNumericCellValue()); } break; case Cell.CELL_TYPE_BOOLEAN: value = cell.getBooleanCellValue(); break; case Cell.CELL_TYPE_BLANK: value = “”; break; default: break; } return value; } /****************************************上传结束*************************************** /** * 多列头创建EXCEL * * @param sheetName 工作簿名称 * @param clazz 数据源model类型 * @param objs excel标题列以及对应model字段名 * @param map 标题列行数以及cell字体样式 * @return * @throws IllegalArgumentException * @throws IllegalAccessException * @throws InvocationTargetException * @throws ClassNotFoundException * @throws IntrospectionException * @throws ParseException */ public static XSSFWorkbook createExcelFile(Class clazz, List objs,Map> map,String sheetName) throws IllegalArgumentException,IllegalAccessException, InvocationTargetException, ClassNotFoundException, IntrospectionException, ParseException{ // 创建新的Excel 工作簿 XSSFWorkbook workbook = new XSSFWorkbook(); // 在Excel工作簿中建一工作表,其名为缺省值, 也可以指定Sheet名称 XSSFSheet sheet = workbook.createSheet(sheetName); // 以下为excel的字体样式以及excel的标题与内容的创建,下面会具体分析; createFont(workbook);//字体样式 createTableHeader(sheet, map);//创建标题(头) createTableRows(sheet, map, objs, clazz);//创建内容 return workbook; } private static XSSFCellStyle fontStyle; private static XSSFCellStyle fontStyle2; public static void createFont(XSSFWorkbook workbook) { // 表头 fontStyle = workbook.createCellStyle(); XSSFFont font1 = workbook.createFont(); font1.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD); font1.setFontName(“黑体”); font1.setFontHeightInPoints((short) 14);// 设置字体大小 fontStyle.setFont(font1); fontStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN); // 下边框 fontStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);// 左边框 fontStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);// 上边框 fontStyle.setBorderRight(XSSFCellStyle.BORDER_THIN);// 右边框 fontStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER); // 居中 // 内容 fontStyle2=workbook.createCellStyle(); XSSFFont font2 = workbook.createFont(); font2.setFontName(“宋体”); font2.setFontHeightInPoints((short) 10);// 设置字体大小 fontStyle2.setFont(font2); fontStyle2.setBorderBottom(XSSFCellStyle.BORDER_THIN); // 下边框 fontStyle2.setBorderLeft(XSSFCellStyle.BORDER_THIN);// 左边框 fontStyle2.setBorderTop(XSSFCellStyle.BORDER_THIN);// 上边框 fontStyle2.setBorderRight(XSSFCellStyle.BORDER_THIN);// 右边框 fontStyle2.setAlignment(XSSFCellStyle.ALIGN_CENTER); // 居中 } /** * 根据ExcelMapping 生成列头(多行列头) * * @param sheet * 工作簿 * @param map * 每行每个单元格对应的列头信息 */ public static final void createTableHeader(XSSFSheet sheet, Map> map) { int startIndex=0;//cell起始位置 int endIndex=0;//cell终止位置 for (Map.Entry> entry : map.entrySet()) { XSSFRow row = sheet.createRow(entry.getKey()); List excels = entry.getValue(); for (int x = 0; x < excels.size(); x++) { //合并单元格 if(excels.get(x).getCols()>1){ if(x==0){ endIndex+=excels.get(x).getCols()-1; CellRangeAddress range=new CellRangeAddress(0,0,startIndex,endIndex); sheet.addMergedRegion(range); startIndex+=excels.get(x).getCols(); }else{ endIndex+=excels.get(x).getCols(); CellRangeAddress range=new CellRangeAddress(0,0,startIndex,endIndex); sheet.addMergedRegion(range); startIndex+=excels.get(x).getCols(); } XSSFCell cell = row.createCell(startIndex-excels.get(x).getCols()); cell.setCellValue(excels.get(x).getHeadTextName());// 设置内容 if (excels.get(x).getCellStyle() != null) { cell.setCellStyle(excels.get(x).getCellStyle());// 设置格式 } cell.setCellStyle(fontStyle); }else{ XSSFCell cell = row.createCell(x); cell.setCellValue(excels.get(x).getHeadTextName());// 设置内容 if (excels.get(x).getCellStyle() != null) { cell.setCellStyle(excels.get(x).getCellStyle());// 设置格式 } cell.setCellStyle(fontStyle); } } } } /** * * @param sheet * @param map * @param objs * @param clazz */ @SuppressWarnings(“rawtypes”) public static void createTableRows(XSSFSheet sheet, Map> map, List objs, Class clazz) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IntrospectionException, ClassNotFoundException, ParseException { int rowindex = map.size(); int maxKey = 0; List ems = new ArrayList<>(); for (Map.Entry> entry : map.entrySet()) { if (entry.getKey() > maxKey) { maxKey = entry.getKey(); } } ems = map.get(maxKey); List widths = new ArrayList(ems.size()); for (Object obj : objs) { XSSFRow row = sheet.createRow(rowindex); for (int i = 0; i < ems.size(); i++) { ExcelBean em = (ExcelBean) ems.get(i); // 获得get方法 PropertyDescriptor pd = new PropertyDescriptor(em.getPropertyName(), clazz); Method getMethod = pd.getReadMethod(); Object rtn = getMethod.invoke(obj); String value = “”; // 如果是日期类型 进行 转换 if (rtn != null) { if (rtn instanceof Date) { value = DateUtils.date2String((Date) rtn,”yyyy-MM-dd”); } else if(rtn instanceof BigDecimal){ NumberFormat nf = new DecimalFormat(“#,##0.00”); value=nf.format((BigDecimal)rtn).toString(); } else if((rtn instanceof Integer) && (Integer.valueOf(rtn.toString())<0 )){ value=”—“; }else { value = rtn.toString(); } } XSSFCell cell = row.createCell(i); cell.setCellValue(value); cell.setCellType(XSSFCell.CELL_TYPE_STRING); cell.setCellStyle(fontStyle2); // 获得最大列宽 int width = value.getBytes().length * 300; // 还未设置,设置当前 if (widths.size() <= i) { widths.add(width); continue; } // 比原来大,更新数据 if (width > widths.get(i)) { widths.set(i, width); } } rowindex++; } // 设置列宽 for (int index = 0; index < widths.size(); index++) { Integer width = widths.get(index); width = width < 2500 ? 2500 : width + 300; width = width > 10000 ? 10000 + 300 : width + 300; sheet.setColumnWidth(index, width); } } }
4. 在 HTML 页面导入需要的 js
[html] view plain copy
5. 在 HTML 添加测试控件
[java] view plain copy
导出
6. 导出通过 a 标签的 get 请求即可以实现,导入则通过 ajax 的 post 请求实现:
[java] view plain copy
$(‘#upLoadPayerCreditInfoExcel’).click(function(){ var cacheVersion=$(“#cacheVersion”).val(); if(checkData()){ $(‘#uploadForm’).ajaxSubmit({ url:$(“#root”).val()+’/creditInfo/uploadReceiverCreditInfoExcel.html’, data:{ ‘cacheVersion’:cacheVersion}, dataType: ‘text’ }); } }); //JS校验form表单信息 function checkData(){ var fileDir = $(“#upfile”).val(); var suffix = fileDir.substr(fileDir.lastIndexOf(“.”)); if(“” == fileDir){ alert(“选择需要导入的Excel文件!”); return false; } if(“.xls” != suffix && “.xlsx” != suffix ){ alert(“选择Excel格式的文件导入!”); return false; } return true; }
7. controller 端实现
导出:
[java] view plain copy
@RequestMapping(value = “/downLoadPayerCreditInfoExcel”, method = RequestMethod.GET) @ResponseBody public void downLoadPayerCreditInfoExcel(HttpServletRequest request,HttpServletResponse response,HttpSession session){ response.reset(); SimpleDateFormat sdf = new SimpleDateFormat(“yyyyMMddhhmmssms”); String dateStr = sdf.format(new Date()); Long companyId=UserUtils.getCompanyIdBySession(session); Map map=new HashMap(); // 指定下载的文件名 response.setHeader(“Content-Disposition”, “attachment;filename=” +dateStr+”.xlsx”); response.setContentType(“application/vnd.ms-excel;charset=UTF-8”); response.setHeader(“Pragma”, “no-cache”); response.setHeader(“Cache-Control”, “no-cache”); response.setDateHeader(“Expires”, 0); XSSFWorkbook workbook=null; try { //导出Excel对象 workbook = creditInfoService.exportPayerCreditInfoExcel(companyId); } catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException | ClassNotFoundException | IntrospectionException | ParseException e1) { e1.printStackTrace(); } OutputStream output; try { output = response.getOutputStream(); BufferedOutputStream bufferedOutPut = new BufferedOutputStream(output); bufferedOutPut.flush(); workbook.write(bufferedOutPut); bufferedOutPut.close(); } catch (IOException e) { e.printStackTrace(); } }
导入:
[java] view plain copy
@ResponseBody @RequestMapping(value=”uploadPayerCreditInfoExcel”,method={RequestMethod.GET,RequestMethod.POST}) Public void uploadPayerCreditInfoExcel(HttpServletRequest request,HttpServletResponse response,HttpSession session) throws Exception { MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; MultipartFile file = multipartRequest.getFile(“upfile”); if(file.isEmpty()){ throw new Exception(“文件不存在!”); } Long companyId=UserUtils.getCompanyIdBySession(session); Long userId=UserUtils.getUserIdBySession(session); InputStream in = file.getInputStream(); creditInfoService.uploadPayerCreditInfoExcel(in,file,companyId,userId); in.close(); PrintWriter out = null; response.setCharacterEncoding(“utf-8”); //防止ajax接受到的中文信息乱码 out = response.getWriter(); out.print(“文件导入成功!”); out.flush(); out.close(); }
8 、 service 层
导入,从 excel 中获得数据放入 List < List <object> >中,然后遍历放入实体,执行插入操作:
[java] view plain copy
public void uploadPayerCreditInfoExcel(InputStream in, MultipartFile file,Long companyId,Long userId) throws Exception { List> listob = ExcelUtils.getBankListByExcel(in,file.getOriginalFilename());
List creditInfoList=new ArrayList(); for (int i = 0; i < listob.size(); i++) { List ob = listob.get(i); CreditInfoBean creditInfoBean = new CreditInfoBean(); creditInfoBean.setCompanyName(String.valueOf(ob.get(0))); creditInfoBean.setBillType(String.valueOf(ob.get(1))); creditInfoBean.setBillNumber(String.valueOf(ob.get(2))); BigDecimal bd=new BigDecimal(String.valueOf(ob.get(3))); creditInfoBean.setBuyerBillAmount(bd.setScale(2, BigDecimal.ROUND_HALF_UP)); creditInfoBean.setReceiveTime(String.valueOf(ob.get(4))); creditInfoBean.setBuyerRemark(String.valueOf(ob.get(5))); creditInfoList.add(creditInfoBean); } }
导出:
[java] view plain copy
public XSSFWorkbook exportPayerCreditInfoExcel(Long companyId) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, ClassNotFoundException, IntrospectionException, com.sun.tools.example.debug.expr.ParseException { List creditInfoList=creditInfoDao.listAllPayerCreditInfoPage(companyId); List ems=new ArrayList<>(); Map>map=new LinkedHashMap<>(); XSSFWorkbook book=null; ems.add(new ExcelBean(“供应商名称”,”companyName”,0)); ems.add(new ExcelBean(“票据类型”,”billType”,0)); ems.add(new ExcelBean(“票据号”,”billNumber”,0)); ems.add(new ExcelBean(“买方是否参与”,”isBuyerIquidation”,0)); ems.add(new ExcelBean(“票据金额”,”buyerBillAmount”,0)); ems.add(new ExcelBean(“应付日期”,”buyerPayTime”,0)); ems.add(new ExcelBean(“剩余天数”,”overplusDays”,0)); ems.add(new ExcelBean(“状态”,”buyerBillStatus”,0)); map.put(0, ems); List afterChangeList=changeBuyerStatus(creditInfoList); book=ExcelUtils.createExcelFile(CreditInfoBean.class, afterChangeList, map, “应付账款信息”); return book; }
还没有评论,来说两句吧...