write (ExcelUtils)

Writes an Excel file to the HTTP response with column width adaptation, dropdown sheets, and Long-to-String conversion to avoid precision loss, then sets download headers.

// Source: https://github.com/yuqing2026/ruoyi-office | License: MIT | Copyright 2021 yudao-cloud
// Provided via justclaw.it.com; keep this notice with the code.
    public static <T> void write(HttpServletResponse response, String filename, String sheetName,
                                 Class<T> head, List<T> data) throws IOException {
        // 输出 Excel
        FastExcelFactory.write(response.getOutputStream(), head)
                .autoCloseStream(false) // 不要自动关闭，交给 Servlet 自己处理
                .registerWriteHandler(new ColumnWidthMatchStyleStrategy()) // 基于 column 长度，自动适配。最大 255 宽度
                .registerWriteHandler(new SelectSheetWriteHandler(head)) // 基于固定 sheet 实现下拉框
                .registerConverter(new LongStringConverter()) // 避免 Long 类型丢失精度
                .sheet(she

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