转自:http://yl-fighting.iteye.com/blog/1726285
用POI读取Excel数据:(版本号:POI3.7)
1、读取Excel
- private List<String[]> rosolveFile(InputStream is, String suffix,
- int startRow) throws IOException, FileNotFoundException {
- Workbook xssfWorkbook = null;
- if ("xls".equals(suffix)) {
- xssfWorkbook = new HSSFWorkbook(is);
- } else if ("xlsx".equals(suffix)) {
- xssfWorkbook = new XSSFWorkbook(is);
- }
- Sheet xssfSheet = xssfWorkbook.getSheetAt(0);
- if (xssfSheet == null) {
- return null;
- }
- ArrayList<String[]> list = new ArrayList<String[]>();
- int lastRowNum = xssfSheet.getLastRowNum();
- for (int rowNum = startRow; rowNum <= lastRowNum; rowNum++) {
- if (xssfSheet.getRow(rowNum) != null) {
- Row xssfRow = xssfSheet.getRow(rowNum);
- short firstCellNum = xssfRow.getFirstCellNum();
- short lastCellNum = xssfRow.getLastCellNum();
- if (firstCellNum != lastCellNum) {
- String[] values = new String[lastCellNum];
- for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
- Cell xssfCell = xssfRow.getCell(cellNum);
- if (xssfCell == null) {
- values[cellNum] = "";
- } else {
- values[cellNum] = parseExcel(xssfCell);
- }
- }
- list.add(values);
- }
- }
- }
- return list;
- }
2、Excel数据处理:
Excel存储日期、时间均以数值类型进行存储,读取时POI先判断是是否是数值类型,再进行判断转化
1、数值格式(CELL_TYPE_NUMERIC):
1.纯数值格式:getNumericCellValue() 直接获取数据
2.日期格式:处理yyyy-MM-dd, d/m/yyyy h:mm, HH:mm 等不含文字的日期格式
1).判断是否是日期格式:HSSFDateUtil.isCellDateFormatted(cell)
2).判断是日期或者时间
cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("h:mm")
OR:cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("yyyy-MM-dd")
3.自定义日期格式:处理yyyy年m月d日,h时mm分,yyyy年m月等含文字的日期格式
判断cell.getCellStyle().getDataFormat()值,解析数值格式
yyyy年m月d日----->31
m月d日---->58
h时mm分--->32
2、字符格式(CELL_TYPE_STRING):直接获取内容
- private String parseExcel(Cell cell) {
- String result = new String();
- switch (cell.getCellType()) {
- case HSSFCell.CELL_TYPE_NUMERIC:// 数字类型
- if (HSSFDateUtil.isCellDateFormatted(cell)) {// 处理日期格式、时间格式
- SimpleDateFormat sdf = null;
- if (cell.getCellStyle().getDataFormat() == HSSFDataFormat
- .getBuiltinFormat("h:mm")) {
- sdf = new SimpleDateFormat("HH:mm");
- } else {// 日期
- sdf = new SimpleDateFormat("yyyy-MM-dd");
- }
- Date date = cell.getDateCellValue();
- result = sdf.format(date);
- } else if (cell.getCellStyle().getDataFormat() == 58) {
- // 处理自定义日期格式:m月d日(通过判断单元格的格式id解决,id的值是58)
- SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
- double value = cell.getNumericCellValue();
- Date date = org.apache.poi.ss.usermodel.DateUtil
- .getJavaDate(value);
- result = sdf.format(date);
- } else {
- double value = cell.getNumericCellValue();
- CellStyle style = cell.getCellStyle();
- DecimalFormat format = new DecimalFormat();
- String temp = style.getDataFormatString();
- // 单元格设置成常规
- if (temp.equals("General")) {
- format.applyPattern("#");
- }
- result = format.format(value);
- }
- break;
- case HSSFCell.CELL_TYPE_STRING:// String类型
- result = cell.getRichStringCellValue().toString();
- break;
- case HSSFCell.CELL_TYPE_BLANK:
- result = "";
- default:
- result = "";
- break;
- }
- return result;
- }
*万能处理方案:
所有日期格式都可以通过getDataFormat()值来判断
yyyy-MM-dd-----14
yyyy年m月d日--- 31
yyyy年m月-------57
m月d日 ----------58
HH:mm-----------20
h时mm分 -------32
- //1、判断是否是数值格式
- if(cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC){
- short format = cell.getCellStyle().getDataFormat();
- SimpleDateFormat sdf = null;
- if(format == 14 || format == 31 || format == 57 || format == 58){
- //日期
- sdf = new SimpleDateFormat("yyyy-MM-dd");
- }else if (format == 20 || format == 32) {
- //时间
- sdf = new SimpleDateFormat("HH:mm");
- }
- double value = cell.getNumericCellValue();
- Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(value);
- result = sdf.format(date);
- }