我正在创建一个程序,我从excel文件中读取数据并将它们存储在表中。我使用Apache POI制作了程序并且工作正常。但是当文件中的空白单元格为时,我遇到了一些问题。程序跳过空白并读取下一个数据。任何人都可以帮助我如何做到这一点?我知道这个问题有几个帖子,但我没有找到对我有用的东西。
从excel文件中读取数据的代码如下。如您所见,我有3种类型的数据。我将如何为BLANK CELL提供选项?
// Create an ArrayList to store the data read from excel sheet.
List sheetData = new ArrayList();
FileInputStream fis = null;
try {
// Create a FileInputStream that will be use to read the
// excel file.
fis = new FileInputStream(strfullPath);
// Create an excel workbook from the file system
HSSFWorkbook workbook = new HSSFWorkbook(fis);
// Get the first sheet on the workbook.
HSSFSheet sheet = workbook.getSheetAt(0);
// store the data read on an ArrayList so that we can printed the
// content of the excel to the console.
Iterator rows = sheet.rowIterator();
while (rows.hasNext()) {
HSSFRow row = (HSSFRow) rows.next();
Iterator cells = row.cellIterator();
List data = new ArrayList();
while (cells.hasNext()) {
HSSFCell cell = (HSSFCell) cells.next();
data.add(cell);
}
sheetData.add(data);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fis != null) {
fis.close();
}
}
showExcelData(sheetData);
}
private static void showExcelData(List sheetData) {
// LinkedHashMap<String, String> tableFields = new LinkedHashMap();
for (int i = 0; i < sheetData.size(); i++) {
List list = (List) sheetData.get(i);
for (int j = 0; j < list.size(); j++) {
Cell cell = (Cell) list.get(j);
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
System.out.print(cell.getNumericCellValue());
} else if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
System.out.print(cell.getRichStringCellValue());
} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
System.out.print(cell.getBooleanCellValue());
} else if (cell.getCellType()== Cell.CELL_TYPE_BLANK ){
System.out.print(cell.toString());
}
if (j < list.size() - 1) {
System.out.print(", ");
}
}
System.out.println("");
}
}
}
我也读过关于workbook.setMissingCellPolicy(HSSFRow.RETURN_NULL_AND_BLANK);
的文章。这有助于解决我的问题吗?
答案 0 :(得分:6)
int maxNumOfCells = sheet.getRow(0).getLastCellNum(); // The the maximum number of columns
Iterator rows = sheet.rowIterator();
while (rows.hasNext()) {
HSSFRow row = (HSSFRow) rows.next();
Iterator cells = row.cellIterator();
List data = new ArrayList();
for( int cellCounter = 0
; cellCounter < maxNumOfCells
; cellCounter ++){ // Loop through cells
HSSFCell cell;
if( row.getCell(cellCounter ) == null ){
cell = row.createCell(cellCounter);
} else {
cell = row.getCell(cellCounter);
}
data.add(cell);
}
sheetData.add(data);
您的方法:
public static void showExcelData(List sheetData) {
// LinkedHashMap<String, String> tableFields = new LinkedHashMap();
for (int i = 0; i < sheetData.size(); i++) {
List list = (List) sheetData.get(i);
for (int j = 0; j < list.size(); j++) {
Cell cell = (Cell) list.get(j);
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
System.out.print(cell.getNumericCellValue());
} else if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
System.out.print(cell.getRichStringCellValue());
} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
System.out.print(cell.getBooleanCellValue());
} else if (cell.getCellType() == Cell.CELL_TYPE_BLANK) {
System.out.print("THIS IS BLANK");
}
if (j < list.size() - 1) {
System.out.print(", ");
}
}
System.out.println("");
}
}
说明:
int maxNumOfCells = sheet.getRow(0).getLastCellNum();
- 此行将确保您能够获得列数。在下一行上使用Row的方法.getLastCellNum()
将导致意外的数字。在电子表格第3行的示例中,该方法将返回2,因为下一个值为空。
for( int cellCounter = 0
; cellCounter < maxNumOfCells
; cellCounter ++){ // Loop through cells
HSSFCell cell;
if( row.getCell(cellCounter ) == null ){
cell = row.createCell(cellCounter);
} else {
cell = row.getCell(cellCounter);
}
data.add(cell);
}
循环细胞。从单元格0(基数0)到最后一个单元格编号。如果找到了单元格null
,基本上,它会创建一个blank
值的单元格。最后,将cell
添加到您的列表中。
答案 1 :(得分:0)
如果您不知道电子表格的大小,另一种解决方案是循环遍历行和列,并将行和列的索引与您解析的前一个索引进行比较。如果增量大于1,您将创建缺少的中间单元格。