从 Java 中预先存在的 Excel 文件中读取数据

Question

I'm having trouble reading data from a pre-existing Excel file.

An example of a fileName is "Donors By Last Name - Thu Dec 15 08/20/40 PST 2016.xls"

This is what my method looks like:

public void addDonorsFF() throws IOException
{
    JTextField a = new JTextField(20);
    Object[] message = {"Enter File Name:", a, "\nIt is best to directly copy paste the file name, including .xls \nYou cannot import Shipping files."};
    int option = JOptionPane.showConfirmDialog(null, message, "Select File", JOptionPane.OK_CANCEL_OPTION);
    if (option == JOptionPane.OK_OPTION)
    {
        String fileName = (String)a.getText();
        FileInputStream file = new FileInputStream(new File(fileName));

        //Create Workbook instance holding reference to .xls file
        HSSFWorkbook workbook = new HSSFWorkbook(file);

        //Get sheet from the workbook
        HSSFSheet sheet = workbook.getSheetAt(0);

        for(int i = 1; i < sheet.getPhysicalNumberOfRows(); i++)
        {
            Row row = sheet.getRow(i);

            for(int j = 0; j < row.getPhysicalNumberOfCells(); j++)
            {
                Cell cell = row.getCell(j);

                //Some code that uses the data in the cell and puts it in a "donor" object;
            }
        }
        workbook.close();


    }
}

I know the file exists for certain, but when I run the program I get this error:

Exception in thread "main" java.io.FileNotFoundException: Donors By Last Name - Thu Dec 15 08/20/40 PST 2016.xls (No such file or directory)

at java.io.FileInputStream.open0(Native Method)

at java.io.FileInputStream.open(FileInputStream.java:195)

at java.io.FileInputStream.(FileInputStream.java:138)

at Directory.addDonorsFF(Directory.java:115)

at Driver.main(Driver.java:24)

I hope there's something simple, this is just going over my head because I'm a beginner. Do you have any suggestions?

Answer 1

You say your file is on your desktop, but you didn't fully qualify that in your file name to open. This should be something like "C:\\users\\myname\\desktop\\Donors..." (if Windows).

The way you entered the file name, it will only look in the current folder where you are running your application for the file.