Java的poi技术遍历Excel时进行空Cell,空row,判断

/** * 导入信息 */@Overridepublic List<Object> add(HttpServletRequest request) {// TODO Auto-generated method stubList<Object> num=new ArrayList<Object>();MultipartHttpServletRequest multipartRequest =(MultipartHttpServletRequest) request;CommonsMultipartFile file = (CommonsMultipartFile)multipartRequest.getFile("zlUpload");if(file!=null){        try {num = save(file.getInputStream());} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}        }returnnum;                } /** * 保存上传的Excel信息 */private List<Object> save(InputStream inputStream) throwsIOException {// TODO Auto-generated method stubList<Object> error_num = new ArrayList<Object>();List<Object> temp =(List<Object>)readXls(inputStream,error_num);System.out.println(temp.get(0).getClass().getName());if(temp.get(0).getClass().getName().equals("org.apache.poi.hssf.usermodel.HSSFCell")){return error_num;}else{TStudentNo student = null;List<TStudentNo> studentList = newArrayList<TStudentNo>();for(int i=0;i<temp.size();i++){student = (TStudentNo)temp.get(i);studentList.add(student);}try {//在插入数据前进行判断，看数据库中是否有不允许重复的字段出现，以打断保存进度int repeat = 0;for(int j = 0;j<studentList.size();j++){TStudentNo Studenttemp =studentMapper.findByStudentNo(studentList.get(j).getStudent_no());//如果查到了，重复数加一，然后跳过不保存if(Studenttemp!=null){repeat++;}}        if(repeat==0){for(int z=0;z<studentList.size();z++){studentMapper.saveStudent(studentList.get(z));}}else{error_num.add("数据库中有相同的数据，请检查学号等不允许重复的部分！");return error_num;}                                } catch (Exception e) {//判断Excel中是否有重复数据，如果有重复跳过保存异常error_num.add("数据库中有相同的数据，请检查学号等不允许重复的部分！");return error_num;} return temp;        }} /** * 逐行遍历其Excel */ private Object readXls(InputStream inputStream,List<Object>error_num) throws IOException {InputStream is = new BufferedInputStream(inputStream);HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);TStudentNo student = null;List<TStudentNo> list = new ArrayList<TStudentNo>();//循环工作表Sheetfor(int numSheet =0;numSheet<hssfWorkbook.getNumberOfSheets();numSheet++){HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);if(hssfSheet == null){continue;} for(int rowNum =2;rowNum<=hssfSheet.getLastRowNum();rowNum++){System.out.println(hssfSheet.getLastRowNum());        HSSFRow hssfRow = hssfSheet.getRow(rowNum);//检查每行的空格数，如果小于4证明有一个或多个空格，但不是整行if(CheckRowNull(hssfRow)<4){student = new TStudentNo();HSSFCell name = hssfRow.getCell(0);HSSFCell student_no = hssfRow.getCell(1);HSSFCell phone = hssfRow.getCell(2);HSSFCell class_no = hssfRow.getCell(3);HSSFCell subject_category = hssfRow.getCell(4);List<HSSFCell> temp = new ArrayList<HSSFCell>();temp.add(0, name);temp.add(1, student_no);temp.add(2, phone);temp.add(3, class_no);temp.add(4, subject_category);int temp1 = 0;//用于跳出双层for循环for(int i=0;i<5;i++){//为记录前台进行提示某行某列出错temp1 = CheckRowError(temp.get(i),error_num,rowNum,i);if(temp1==-1){break;}}if(temp1==-1){return temp;}student.setName(getCellValue(name));student.setPhone(getCellValue(phone));student.setStudent_no(getCellValue(student_no));student.setClass_no(getCellValue(class_no));student.setSubject_category(Integer.parseInt(getCellValue(subject_category)));list.add(student);}else{continue;}} }return list;} /** * 对Excel的各个单元格的格式进行判断并转换 */private String getCellValue(HSSFCell cell) {         String cellValue = "";         DecimalFormat df = newDecimalFormat("#");         switch (cell.getCellType()) {         case HSSFCell.CELL_TYPE_STRING:             cellValue =cell.getRichStringCellValue().getString().trim();             break;         case HSSFCell.CELL_TYPE_NUMERIC:             cellValue =df.format(cell.getNumericCellValue()).toString();             break;         case HSSFCell.CELL_TYPE_BOOLEAN:             cellValue =String.valueOf(cell.getBooleanCellValue()).trim();             break;         case HSSFCell.CELL_TYPE_FORMULA:             cellValue =cell.getCellFormula();             break;         default:             cellValue = "";         }         return cellValue;     }  //判断某行某列有问题private int CheckRowError(HSSFCell cell,List<Object>error_num,int rowNum,int cell_num){//判断各个单元格是否为空if(cell==null||cell.equals("")||cell.getCellType() ==HSSFCell.CELL_TYPE_BLANK){error_num.add("出错啦！请检查第"+(rowNum+1)+"行第"+(cell_num+1)+"列。"+"如果您在该行没有数据，建议您选择删除该行，重试！");return -1;}return 0;} //判断行为空private int CheckRowNull(HSSFRow hssfRow){int num = 0;Iterator<Cell> cellItr =hssfRow.iterator();while(cellItr.hasNext()){ Cell c =cellItr.next();                         if(c.getCellType() ==HSSFCell.CELL_TYPE_BLANK){ num++; }}return num;}