如何使用Retrofit 2下载pdf文件

implementation 'com.squareup.retrofit2:retrofit:2.x.x'
implementation 'com.squareup.retrofit2:converter-scalars:2.x.x'
implementation 'com.squareup.retrofit2:converter-gson:2.x.x'

public interface ApiService {
    @GET("download/pdf")
    @Streaming
    Call<ResponseBody> downloadPdfFile();
}

String baseUrl = "https://example.com/api/";
Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(baseUrl)
        .build();
ApiService apiService = retrofit.create(ApiService.class);

Call<ResponseBody> call = apiService.downloadPdfFile();
call.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
        if (response.isSuccessful()) {
            // 获取文件字节流
            ResponseBody responseBody = response.body();
            if (responseBody != null) {
                try {
                    // 将文件保存到本地
                    InputStream inputStream = responseBody.byteStream();
                    File file = new File("path/to/save/pdf/file.pdf");
                    FileOutputStream fileOutputStream = new FileOutputStream(file);
                    byte[] buffer = new byte[4096];
                    int bytesRead;
                    while ((bytesRead = inputStream.read(buffer)) != -1) {
                        fileOutputStream.write(buffer, 0, bytesRead);
                    }
                    fileOutputStream.close();
                    inputStream.close();
                    // 下载完成
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        } else {
            // 处理请求失败的情况
        }
    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {
        // 处理请求失败的情况
    }
});