Question

我正在尝试阅读excel工作表的内容，但我的方法不断抛出异常。我已经尝试了一切无济于事，但我确信它是一个非常小的细节，我没有看到。有人可以用一双新眼睛看我的代码，并可能指出我做错了什么。谢谢！

 /**
 * This method sets the path to the excel file and the excel sheet as well as
 * initializing the stream
 */
 public static void setExcelFile(String path, String sheetName) {
    try {
        FileInputStream excelFile = new FileInputStream(path);
        workbook = new XSSFWorkbook(excelFile);
        worksheet = workbook.getSheet(sheetName);
    }
    catch (Exception e) {
        e.printStackTrace();
    }
 }


 /**
 * This method reads the cell data from the excel file
 */
public static String getCellData(int rowNum, int colNum) {
    try {
        //This is what is causing my nullpointerexception according to eclipse
        row = worksheet.getRow(rowNum);
        //cell = worksheet.getRow(rowNum).getCell(colNum);
        cell = row.getCell(colNum);
        String cellData = cell.getStringCellValue();
        return cellData;
    }
    catch (Exception e) {
        e.printStackTrace();
        return "Lactoferrin";
    }

}


/**
 * This is how i call both methods
 */
public static void main(String[] args) {
    try {
        ExcelUtility.setExcelFile(PATHTOTESTDATA, FILENAME);
        String cellContents = ExcelUtility.getCellData(1,0);
        System.out.println(cellContents);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

Answer 1

找到它。我已经将excel文件保存在包含类文件的包中，eclipse找不到它......我不知道为什么。所以我将它移动到项目根目录下的一个文件夹中，然后就可以了。

检索Excel单元格内容将返回NullPointerException

1 个答案: