Java的poi技术遍历Excel时进行空Cell,空row,判断

/**
 * 导入信息
 */
@Override
public List<Object> add(HttpServletRequest request) {
// TODO Auto-generated method stub
List<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 block
e.printStackTrace();
}
}
returnnum;
}

/**
 * 保存上传的Excel信息
 */
private List<Object> save(InputStream inputStream) throwsIOException {
// TODO Auto-generated method stub
List<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Sheet
for(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;
}