java - 使用 Apache POI 在 Java 中读取/写入 Excel 文件的问题

Question

大家好，我是 java poi 库的新手，我尝试了所有的运气来学习这个库，但仍然没有运气

我想要这个输出

Excel1.xls 有此数据

ZIP CODE | PLACE | DATE
211

我想复制所有第一行数据。

ZIP CODE | PLACE | DATE

并将其放置到另一张纸上

这是我编写的代码

public static void main(String[] args) throws IOException{

    try {
        FileInputStream file = new FileInputStream(new File("d:\\input.xls"));

        HSSFWorkbook workbook = new HSSFWorkbook(file);
        HSSFSheet sheet = workbook.getSheetAt(0);
        HSSFSheet zip1 = workbook.createSheet("ZIP CODE 1");


        for(Row row : sheet){
            int i=0;

            for(Cell cell : row){

                cell.setCellType(Cell.CELL_TYPE_STRING);
                System.out.print(cell.getStringCellValue() + "\t");
                String a = cell.getStringCellValue();

                cell = zip1.createRow(i).createCell(i);

                i++;
                cell.setCellValue(a);
             }
             break;

         }

        file.close();
        FileOutputStream outFile =new FileOutputStream(new File("d:\\output.xls"));
        workbook.write(outFile);
        outFile.close();

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Answer 1

发现问题

1. 对于 .xlsx 文件 -> HSSFWorkbook 应为 XSSFWorkbook

2. 循环。您不想循环每一行，而只需要第一行。只需循环列

3. 不要每次要写入单元格时都创建一行。仅创建一次新行。

工作示例:

try {
    FileInputStream file = new FileInputStream(new File(
            "C:\\path\\Book1.xlsx"));

    XSSFWorkbook workbook = new XSSFWorkbook(file);
    XSSFSheet sheet = workbook.getSheetAt(0);
    XSSFSheet zip1 = workbook.createSheet("ZIP CODE 1");

    Row readFirstRow = sheet.getRow(0);
    Row writeFirstRow = zip1.createRow(0);

    for (Cell cell : readFirstRow) {

        cell.setCellType(Cell.CELL_TYPE_STRING);
        String a = cell.getStringCellValue();

        cell = writeFirstRow.createCell(cell.getColumnIndex());
        cell.setCellValue(a);
    }

    file.close();
    FileOutputStream outFile = new FileOutputStream(new File(
            "C:\\path\\BookOut.xlsx"));
    workbook.write(outFile);
    outFile.close();

} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}