java下载文件代码

private void download2(HttpServletResponse response, String zipFilePath, String filename) throws IOException {
        // 设置响应的内容类型为ZIP文件
        response.setContentType("application/zip");

        response.setHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");

        // 创建输入流以读取ZIP文件内容
        FileInputStream fileInputStream = new FileInputStream(new File(zipFilePath));

        // 获取响应输出流
        javax.servlet.ServletOutputStream out = response.getOutputStream();

        // 缓冲区大小
        byte[] buffer = new byte[4096];
        int bytesRead;

        // 读取ZIP文件内容并写入响应输出流
        while ((bytesRead = fileInputStream.read(buffer)) != -1) {
            out.write(buffer, 0, bytesRead);
        }

        // 关闭输入流和输出流
        fileInputStream.close();
        out.close();
    }