// 实现 ReadListener 接口，设置读取数据的操作
public class DemoDataListener implements ReadListener<DemoData> {
    @Override
    public void invoke(DemoData data, AnalysisContext context) {
        System.out.println("解析到一条数据" + JSON.toJSONString(data));
    }
 
    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        System.out.println("所有数据解析完成！");
    }
}
 
public static void main(String[] args) {
    String fileName = "demo.xlsx";
    // 读取 Excel 文件
    FastExcel.read(fileName, DemoData.class, new DemoDataListener()).sheet().doRead();
}

// 示例数据类
public class DemoData {
    @ExcelProperty("字符串标题")
    private String string;
    @ExcelProperty("日期标题")
    private Date date;
    @ExcelProperty("数字标题")
    private Double doubleData;
    @ExcelIgnore
    private String ignore;
}
 
// 填充要写入的数据
private static List<DemoData> data() {
    List<DemoData> list = new ArrayList<>();
    for (int i = 0; i < 10; i++) {
        DemoData data = new DemoData();
        data.setString("字符串" + i);
        data.setDate(new Date());
        data.setDoubleData(0.56);
        list.add(data);
    }
    return list;
}
 
public static void main(String[] args) {
    String fileName = "demo.xlsx";
    // 创建一个名为“模板”的 sheet 页，并写入数据
    FastExcel.write(fileName, DemoData.class).sheet("模板").doWrite(data());
}