上传并解析excel文件

主要是要知道使用apache的包

import org.apache.commons.fileupload.FileItem;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

FileItem item = (FileItem) obj;

List dataList  = ExcelUtil.readAllData(item.getInputStream(), 0);

// 解析代码开始


    /**
     * 取Excel所有数据，包含header
     * 
     */
    @SuppressWarnings("unchecked")
    public static List readAllData(InputStream is, int sheetIndex) throws Exception {
        Workbook wb = null;
        try {
            wb = WorkbookFactory.create(is);
            List dataList = new ArrayList();
            int columnNum = 0;
            int startColNum = 0;
            int endColNum = 0;
            Sheet sheet = wb.getSheetAt(sheetIndex);
            if (sheet.getRow(0) != null) {
                startColNum = sheet.getRow(0).getFirstCellNum();
                endColNum = sheet.getRow(0).getLastCellNum();
                columnNum = endColNum - startColNum;
            }
            if (columnNum > 0) {
                for (Row row : sheet) {
                    if (row == null) {
                        continue;
                    }
                    String[] singleRow = new String[columnNum + 1];
                    singleRow[0] = (row.getRowNum() + 1) + "";
                    for (int i = 0; i < columnNum; i++) {
                        Cell cell = row.getCell(i + startColNum);
                        if (cell != null) {
                            singleRow[i + 1] = getCellValue(cell);
                        } else {
                            singleRow[i + 1] = "";
                        }
                    }
                    dataList.add(singleRow);
                }
            }
            return dataList;
        } catch (IOException e) {
            logger.error("io exception", e);
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                logger.error("io close error", e);
            }
        }
        return Collections.EMPTY_LIST;
    }

/**
     * 取一个excel单元格的值
     */
    public static String getCellValue(Cell cell) {
        String cellValue = "";
        if (cell != null) {
            switch (cell.getCellType()) {
                case Cell.CELL_TYPE_STRING:
                    cellValue = StringUtil.trim(cell.getRichStringCellValue().getString());
                    break;
                case Cell.CELL_TYPE_BOOLEAN:
                    cellValue = cell.getBooleanCellValue() ? "TRUE" : "FALSE";
                    break;
                case Cell.CELL_TYPE_NUMERIC:
                    if (DateUtil.isCellDateFormatted(cell)) {
                        cellValue = new SimpleDateFormat(DATE_FORMAT).format(cell.getDateCellValue());
                    } else {
                        cellValue = NumberFormat.getNumberInstance().format(cell.getNumericCellValue())
                                .replaceAll(",", "");
                    }
                    break;
                case Cell.CELL_TYPE_FORMULA:
                    cellValue = StringUtil.trim(cell.getCellFormula());
                    break;
                case Cell.CELL_TYPE_ERROR:
                    cellValue = StringUtil.trim(String.valueOf(cell.getErrorCellValue()));
                    break;
                default:
                    cellValue = "";
            }
        }
        return cellValue;
    }