HttpServletResponse输出excel文件代码

以下是使用HttpServletResponse输出Excel文件的Java代码示例：

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // 设置响应头信息，提示浏览器下载文件
    response.setContentType("application/vnd.ms-excel;charset=utf-8");
    response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("example.xlsx", "UTF-8"));

    // 创建Excel文件
    XSSFWorkbook workbook = new XSSFWorkbook();
    XSSFSheet sheet = workbook.createSheet("Sheet1");
    XSSFRow row = sheet.createRow(0);
    XSSFCell cell = row.createCell(0);
    cell.setCellValue("Hello World!");

    // 将Excel文件写入响应流
    OutputStream outputStream = response.getOutputStream();
    workbook.write(outputStream);

    // 关闭资源
    outputStream.flush();
    outputStream.close();
    workbook.close();
}

注意，此代码使用了Apache POI库来创建和操作Excel文件。在实际使用中，需要添加POI库的依赖。