关于POI读取excel

public static String[][] getData(File file, int ignoreRows) throws Exception{List<String[]> result = new ArrayList<String[]>();int rowSize = 0;BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));// 打开HSSFWorkbookPOIFSFileSystem fs = new POIFSFileSystem(in);HSSFWorkbook wb = new HSSFWorkbook(fs);HSSFCell cell = null;for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {HSSFSheet st = wb.getSheetAt(sheetIndex);// 第一行为标题，不取for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {HSSFRow row = st.getRow(rowIndex);if (row == null) {continue;}int tempRowSize = row.getLastCellNum() + 1;if (tempRowSize > rowSize) {rowSize = tempRowSize;}String[] values = new String[rowSize];Arrays.fill(values, "");boolean hasValue = false;for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {String value = "";cell = row.getCell(columnIndex);if (cell != null) {// 注意：一定要设成这个，否则可能会出现乱码cell.setEncoding(HSSFCell.ENCODING_UTF_16);switch (cell.getCellType()) {case HSSFCell.CELL_TYPE_STRING:value = cell.getStringCellValue();break;case HSSFCell.CELL_TYPE_NUMERIC: short format = cell.getCellStyle().getDataFormat();  SimpleDateFormat sdf = null;  if (184==format) { // 时间2017-10-23 16:13:36                               sdf = new SimpleDateFormat("yyyy/MM/dd/hh/mm/ss");                               double time = cell.getNumericCellValue();            Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(time);            value = sdf.format(date);                                 }else if(185==format){                                 sdf = new SimpleDateFormat("yyyy/MM/dd");                                     double time = cell.getNumericCellValue();                 Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(time);                 value = sdf.format(date);                                 }else{                                 value = String.valueOf(cell.getNumericCellValue()); //小数                                 }break;case HSSFCell.CELL_TYPE_FORMULA:// 导入时如果为公式生成的数据则无值if (!cell.getStringCellValue().equals("")) {value = cell.getStringCellValue();} else {value = cell.getNumericCellValue() + "";}break;case HSSFCell.CELL_TYPE_BLANK:value="\t";break;case HSSFCell.CELL_TYPE_ERROR:value = "";break;case HSSFCell.CELL_TYPE_BOOLEAN:value = (cell.getBooleanCellValue() == true ? "Y" : "N");break;default:value = "";}}if (columnIndex == 0 && value.trim().equals("")) {break;}values[columnIndex] = rightTrim(value);hasValue = true;}if (hasValue) {result.add(values);}}}in.close();String[][] returnArray = new String[result.size()][rowSize];for (int i = 0; i < returnArray.length; i++) {returnArray[i] = (String[]) result.get(i);}return returnArray;}public static String rightTrim(String str) {if (str == null) {return "";}int length = str.length();for (int i = length - 1; i >= 0; i--) {if (str.charAt(i) != 0x20) {break;}length--;}return str.substring(0, length);}

这里的代码

if (184==format)  // 时间2017-10-23 16:13:36

因为这个时间是文本格式的他的对应值是184，还有

     Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(time);

这段我用的POI 3.7版本才行的，用的另一个版本不行。。。这段代码可以写一个工具封起来。