java 使用poi 批量导入excel

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.9</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.15</version>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.4</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-scratchpad</artifactId>
    <version>3.9</version>
</dependency>

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.2</version>
</dependency>

List<CorpList> list = new LinkedList<>();
HSSFWorkbook workbook = new HSSFWorkbook(file.getInputStream());
HSSFSheet sheet = workbook.getSheetAt(0);//这是sheet页
int firstRowNum = 0;
int lastRowNum = sheet.getLastRowNum();
//i等于2是因为excel从第三行开始有的数据
for (int i = 2; i <= lastRowNum; i++) {
    HSSFRow row = sheet.getRow(i);
    //获取当前行最后单元格号
    int lastCellNum = row.getLastCellNum();
    CorpList corpList = new CorpList();

    row.getCell(0).setCellType(Cell.CELL_TYPE_STRING);
    if (row.getCell(0).getStringCellValue()!=null&&!row.getCell(0).getStringCellValue().equals("")){
        corpList.setCorpid(Integer.parseInt(row.getCell(0).getStringCellValue()));
    }

    row.getCell(1).setCellType(Cell.CELL_TYPE_STRING);
    if (row.getCell(1).getStringCellValue()!=null&&!row.getCell(1).getStringCellValue().equals("")){
            corpList.setCorpname(row.getCell(1).getStringCellValue());
    }

    row.getCell(2).setCellType(Cell.CELL_TYPE_STRING);
    if (row.getCell(2).getStringCellValue()!=null&&!row.getCell(2).getStringCellValue().equals("")){
        corpList.setParentid(Integer.parseInt(row.getCell(2).getStringCellValue()));
    }
    row.getCell(3).setCellType(Cell.CELL_TYPE_STRING);
    if(row.getCell(3).getStringCellValue()!=null&&!row.getCell(3).getStringCellValue().equals("")){
        corpList.setXh(Integer.parseInt(row.getCell(3).getStringCellValue()));
    }

    row.getCell(4).setCellType(Cell.CELL_TYPE_STRING);
    if(row.getCell(4).getStringCellValue()!=null&&!row.getCell(4).getStringCellValue().equals("")){
        corpList.setCorpmanager(row.getCell(4).getStringCellValue());
    }
    list.add(corpList);
}