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从excel中读取空指针异常java XSSFCell cell = row.getCell(j);

[英]getting null pointer exception java while reading from excel XSSFCell cell = row.getCell(j);

private String[][] data;

// to read from excel file

public void readFile() throws IOException {

    // Path to the excel file
    // File datafile = new File("C:\\Users\\atomar\\Documents\test.xlsx");
    // A Buffered File Input Stream to read the data
    FileInputStream f = new FileInputStream(
            "C:\\Users\\atomar\\Documents\\test.xlsx");
    System.out.println("file found");
    // InputStream fis = new BufferedInputStream(new FileInputStream("f"));
    // We create a workbook which represents the excel file
    XSSFWorkbook book = new XSSFWorkbook(f);

    // Next a sheet which represents the sheet within that excel file
    XSSFSheet sheet = book.getSheet("Sheet1");

    // No of rows in the sheet
    int rowNum = sheet.getLastRowNum() + 1;
    System.out.println("rowNum");

    // No of columns in the sheet
    int colNum = sheet.getRow(0).getLastCellNum();

    // A Two dimensional array of Strings which represents the data in the
    // sheet
    data = new String[rowNum][colNum];
    {

        for (int i = 0; i < rowNum; i++) {
            // Get the row
            XSSFRow row = sheet.getRow(i);

        for (int j = 0; j < colNum; j++) {
            // Get the columns or cells for the first row and keep
                // looping
                // for the other rows
        XSSFCell cell = row.getCell(j);

        // Make a call to the method cellToString which actually
                // converts the cell contents to String
                data[i][j] = cellToString(cell);

            //  data[i][j] = value;

    // Here is where you write the logic to handle the data.I am
                // just printing out the contents here.

                //System.out.println("The value is " + data[i][j]);


            }
        }

在这里我叫那个功能

public void InterestedParty() throws InterruptedException {
    try {
        readFile();
    } catch (IOException e1) {
    }
}

收到错误消息:不支持这种类型的单元格,我从输入excel文件中删除了两行数据,然后在其正常工作之前就开始了。 但是现在我已经完全删除了那些行,还有问题

如果没有数据,则XSSFCell将为null 检查它是否为null 之后,调用cellToString()方法。

    XSSFCell cell = row.getCell(j);
    if(cell != null) {
        data[i][j] = cellToString(cell);
    } else {
        // if you would like to set value when cell is null
        row.createCell(j).setCellValue(your value);
    }

您可以有一行数据,下一行为空,然后另一行为数据。 如果未定义中间行,则可以将其视为null,因此我的建议是为行使用迭代器。
RowIteratior是一个好的开始。
同样,一旦有了该行,就可以使用单元格迭代器遍历单元格。 请记住,未定义的单元格将被视为null并被跳过,但是空白单元格不为null!
单元迭代器在此处记录。
您的方法也不错,但是在使用对象之前,您需要在每次迭代中检查是否为空或为空。

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