如何将从Rest WS下载的PDF文件保存为byte[]数组

URL url = new URL("http://example.com/path/to/file.pdf");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");

// 获取响应码
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
    // 读取响应流并保存为byte[]数组
    InputStream inputStream = connection.getInputStream();
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    byte[] buffer = new byte[4096];
    int bytesRead;
    while ((bytesRead = inputStream.read(buffer)) != -1) {
        outputStream.write(buffer, 0, bytesRead);
    }
    byte[] fileBytes = outputStream.toByteArray();

    // 关闭流
    outputStream.close();
    inputStream.close();

    // 现在，fileBytes数组中保存了PDF文件的内容
} else {
    // 处理请求失败的情况
}