Android + POI Excel +在现有文件中添加数据

I am trying to append the data in existing excel file, but nothing is written. What am I doing wrong?

我试图将数据附加到现有的excel文件中,但没有写入任何内容。我究竟做错了什么?

    public static void writeSheet(String data) {
    HSSFWorkbook workbook;

    try {
        String outFileName = "filebook.xls";

        File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
        File outFile = new File(path, outFileName);
        workbook = (HSSFWorkbook) WorkbookFactory.create(outFile);

        Row row = workbook.getSheetAt(0).createRow(0);
        Cell cell = row.createCell(0);
        cell.setCellValue("text");

        OutputStream outputStream = new FileOutputStream(outFile,true);
        workbook.write(outputStream);

        outputStream.close();
        workbook.close();

    } catch (Exception e) {
        e.printStackTrace();
    }
}

2 个解决方案

#1

Instead

File outFile = new File(path, outFileName);
workbook = (HSSFWorkbook) WorkbookFactory.create(outFile);

Try with

FileInputStream outFile = new FileInputStream(new File(path));
workbook = new HSSFWorkbook(outFile);

So your code

所以你的代码

public static void writeSheet(String data) {
HSSFWorkbook workbook;

try {
    String outFileName = "filebook.xls";

    File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);

    FileInputStream file = new FileInputStream(new File(path, outFileName))
    workbook = new HSSFWorkbook(file);

    Row row = workbook.getSheetAt(0).createRow(0);
    Cell cell = row.createCell(0);
    cell.setCellValue("text");

    file.close();

    FileOutputStream outFile =new FileOutputStream(new File(path, outFileName));
    workbook.write(outFile);
    outFile.close();

} catch (Exception e) {
    e.printStackTrace();
}

}

#2

If you are looking to create Excell file using java

如果您要使用java创建Excell文件

File file = new File(filename);
        WorkbookSettings wbSettings = new WorkbookSettings();
        wbSettings.setLocale(new Locale("en", "EN"));
        WritableWorkbook workbook = Workbook.createWorkbook(file,
                wbSettings);

        workbook.createSheet("My_excell_file", 0);
        WritableSheet excelSheet = workbook.getSheet(0);
         WritableFont ledgerFont = new WritableFont(
        WritableFont.createFont("Arial"),
        WritableFont.DEFAULT_POINT_SIZE, WritableFont.BOLD, false,
        UnderlineStyle.NO_UNDERLINE, Colour.GRAY_80);
        Label labelhead1;
        Label labelhead2;
        Label labelhead3;
        private WritableCellFormat headFormat, langFormat;
        labelhead1 = new Label(0, 1, "KEY", this.headFormat);
        labelhead2 = new Label(1, 1, "VALUE", this.headFormat);
        labelhead3 = new Label(2, 1, "PROPERTY", this.headFormat);
        excelSheet.addCell(labelhead1);
        excelSheet.addCell(labelhead2);
        excelSheet.addCell(labelhead3);
        workbook.write();
        workbook.close();
        //           For Update
        HSSFRow row;
        row = sheet.getRow(0);
        cell = row.getCell(0);
        cell.setCellValue("Updated Values");

#1