java 读取excel

public static ResponseData readExcel(File file) throws Exception{
    ResponseData responseData = null;
    List<String> excelHeadList = new ArrayList<String>();
    try {
        InputStream stream = new FileInputStream(file);
        Workbook wb = null;
　　　　　//判断excel是03版的还是07版的
        if (file.getName().toLowerCase().endsWith("xls")) {
            wb = new HSSFWorkbook(stream);
        } else {
            wb = new XSSFWorkbook(stream);
        }
        Sheet sheet = wb.getSheetAt(0);
　　　　//以表头为（“ID”，“姓名”，“年龄”）的excel为例

        String[] toutle = {"ID","姓名","年龄"};
        int rowNum = sheet.getLastRowNum();// 行数
        Row rowTitle = sheet.getRow(0);//头部列
        int cellNum = rowTitle.getLastCellNum();//列数
        // 此时是一个空的Excle表格或者是一个只有头的Excle表格
        if (rowNum == 0 && sheet.getPhysicalNumberOfRows() == 0) {
            responseData = ResponseData.getSucessResponse("上传的表格为空");
            return responseData;
        } else {
　　　　　　　　//将上传的excel表头内容放入excelHeadList中
            for (int i = 0; i < cellNum; i++) {
                if(rowTitle.getCell(i)!=null){
                    excelHeadList.add(rowTitle.getCell(i).toString());
                }
            }
            for (int i = 1; i <= rowNum; i++) {
                //循环Excel中的行数开始
                Map<String, Object> map = new HashMap<String, Object>();
                Row row = sheet.getRow(i);
                if (toutle.length != cellNum) {
                    //判断是否多列或少列
                    if (toutle.length > cellNum) {
                        //少列
                        responseData = ResponseData.getErrorResponse("导入Excel数据缺少列，请确认后再导入数据。");
                        return responseData;
                    } else {
                        //多列
                        responseData = ResponseData.getErrorResponse("导入Excel数据多出列，请确认后再导入数据。");
                        return responseData;
                    }
                } else {
　　　　　　　　　　　　//判断上传的表头是否和预设的表头内容一样
                    for (int j = 0; j <excelHeadList.size() ; j++) {
                        if(!excelHeadList.get(j).equals(toutle[j])){
                            responseData = ResponseData.getSucessResponse("表格表头数据不规范，请重试！");
                            return responseData;
                        }
                    }
                    for (int j = 0; j < cellNum; j++) {
                        String cellValue = "";
                        Cell cell = row.getCell(j);
                        if(cell != null){
                            cellValue=cell.toString();
                        }
                        map.put(toutle[j], cellValue);
                    }
                }
                for (Map.Entry<String, Object> entry : map.entrySet()) {
                    System.out.println("key= " + entry.getKey() + " and value= "
                            + entry.getValue());
                }
            }
        }
        responseData = ResponseData.getSucessResponse("上传完成！");
    }catch (Exception e){
        responseData = ResponseData.getSucessResponse("上传失败，请重试！");
    }
    return responseData;
}