private static List<ImportViewModel> readExcelFile() { List<ImportViewModel> datas = new ArrayList<>(); FileInputStream inputStream = null; Workbook workbook = null; try { inputStream = new FileInputStream("/sdcard/Template/IC1001.xlsx"); workbook = WorkbookFactory.create(inputStream); Sheet sheet = workbook.getSheetAt(4); Iterator<Row> rowIterator = sheet.rowIterator(); while (rowIterator.hasNext()) { Row row = rowIterator.next(); ImportViewModel importViewModel = new ImportViewModel(); Iterator<Cell> columnIterator = row.cellIterator(); while (columnIterator.hasNext()) { importViewModel.setName("商品名称:" + columnIterator.next().getStringCellValue()); importViewModel.setType("商品类型:" + columnIterator.next().getStringCellValue()); importViewModel.setStyle("商品款式:" + columnIterator.next().getStringCellValue()); importViewModel.setInventoryNum("预期应有库存:" + columnIterator.next().getStringCellValue()); datas.add(importViewModel); } } } catch (IOException | InvalidFormatException e) { e.printStackTrace(); } finally { try { if (workbook != null) { workbook.close(); } if (inputStream != null) { inputStream.close(); } } catch (IOException e) { e.printStackTrace(); } } return datas; }@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ListView listView = findViewById(R.id.list_view); List<ImportViewModel> data = readExcelFile(); // 调用您的 readExcelFile() 方法获取数据 // ImportViewModelAdapter adapter = new ImportViewModelAdapter(data); // listView.setAdapter(adapter); RfApplication.toneGenerator = new ToneGenerator(streamType, percantageVolume);Unable to start activity ComponentInfo{com.ives.upcrfid_zebra/com.ives.upcrfid_zebra.MainActivity}: java.lang.IllegalArgumentException: Sheet index (4) is out of range (0..0)

根据错误提示，Sheet index (4) is out of range (0..0)，说明您正在尝试读取一个超出范围的表格索引，这里只有一个表格，因此可用的索引值为0。您需要将以下代码中的索引值4更改为0：

Sheet sheet = workbook.getSheetAt(4);

修改为：

Sheet sheet = workbook.getSheetAt(0);

相关问题

private static List<ImportViewModel> readExcelFile() { List<ImportViewModel> datas = new ArrayList<>(); FileInputStream inputStream = null; Workbook workbook = null; try { inputStream = new FileInputStream("/sdcard/Template/IC1001.xlsx"); workbook = WorkbookFactory.create(inputStream); Sheet sheet = workbook.getSheetAt(4); Iterator<Row> rowIterator = sheet.rowIterator(); while (rowIterator.hasNext()) { Row row = rowIterator.next(); ImportViewModel importViewModel = new ImportViewModel(); Iterator<Cell> columnIterator = row.cellIterator(); while (columnIterator.hasNext()) { importViewModel.setName("商品名称:" + columnIterator.next().getStringCellValue()); importViewModel.setType("商品类型:" + columnIterator.next().getStringCellValue()); importViewModel.setStyle("商品款式:" + columnIterator.next().getStringCellValue()); importViewModel.setInventoryNum("预期应有库存:" + columnIterator.next().getStringCellValue()); datas.add(importViewModel); } } } catch (IOException | InvalidFormatException e) { e.printStackTrace(); } finally { try { if (workbook != null) { workbook.close(); } if (inputStream != null) { inputStream.close(); } } catch (IOException e) { e.printStackTrace(); } } return datas; }将返回值显示到前端页面上

假设你使用的是Java Spring框架，可以使用Thymeleaf模板引擎将返回值显示到前端页面上。首先在Controller中定义一个请求处理方法，将读取Excel文件的结果存入Model中，然后返回对应的HTML页面：

@GetMapping("/excel")
public String showExcelData(Model model) {
    List<ImportViewModel> datas = readExcelFile();
    model.addAttribute("datas", datas);
    return "excelData";
}

然后在HTML页面中使用Thymeleaf标签来渲染数据：

<table>
  <thead>
    <tr>
      <th>商品名称</th>
      <th>商品类型</th>
      <th>商品款式</th>
      <th>预期应有库存</th>
    </tr>
  </thead>
  <tbody>
    <tr th:each="data : ${datas}">
      <td th:text="${data.name}"></td>
      <td th:text="${data.type}"></td>
      <td th:text="${data.style}"></td>
      <td th:text="${data.inventoryNum}"></td>
    </tr>
  </tbody>
</table>

这样就可以将读取Excel文件的结果以表格的形式展示在HTML页面上了。

private List<String> readExcelFile() { List<String> datas = new ArrayList<>(); try { FileInputStream inputStream = new FileInputStream("/sdcard/Template/IC1001.xlsx"); Workbook workbook = WorkbookFactory.create(inputStream); Sheet sheet = workbook.getSheetAt(0); for (Row row : sheet) { for (Cell cell : row) { datas.add(cell.toString()); } } workbook.close(); } catch (IOException | InvalidFormatException e) { e.printStackTrace(); } return datas; }读取不到excel中的数据，怎么解决

首先，确保你的文件路径是正确的，且文件存在。另外，这个方法只会将 Excel 文件中的每个单元格的数据都添加到列表中，而不会将它们按行添加。如果你想要按行读取 Excel 文件中的数据，可以尝试下面的代码：

private List<List<String>> readExcelFile() {
    List<List<String>> datas = new ArrayList<>();
    try {
        FileInputStream inputStream = new FileInputStream("/sdcard/Template/IC1001.xlsx");
        Workbook workbook = WorkbookFactory.create(inputStream);
        Sheet sheet = workbook.getSheetAt(0);
        for (Row row : sheet) {
            List<String> rowData = new ArrayList<>();
            for (Cell cell : row) {
                rowData.add(cell.toString());
            }
            datas.add(rowData);
        }
        workbook.close();
    } catch (IOException | InvalidFormatException e) {
        e.printStackTrace();
    }
    return datas;
}

这样，你就可以获取到一个二维列表，其中每个子列表对应 Excel 文件中的一行数据。