android - 如何使用okHttp读取从resteasy发送到android的多部分响应？

Question

我想从 JBoss 服务器上传文件列表(在我的例子中是图像)到 android。我这样做是通过下面的书面代码:

@GET
@Path("/report/{filename}")
@Produces({MediaType.MULTIPART_FORM_DATA})
public MultipartFormDataOutput getReport(@PathParam("filename") String filename, @Context HttpServletRequest request) {
    try {
        String token = request.getHeader("Authorization");
        List<File> file = processImage.getImage(filename,token);
        MultipartFormDataOutput output = new MultipartFormDataOutput();
        for(File image: file){
        System.out.println("class of this" +image + "MMMM" +image.exists());
        output.addPart(image, new MediaType("image","jpg"));
        }
        return output;

    } .....
      .......
}

在 Android 端，我想读取响应(多部分形式的文件)。我正在使用 okHttp 建立连接。在互联网上搜索了很多，我尝试了下面的代码来读取多部分响应，但它不起作用。似乎没有从流中读取任何内容。

ByteArrayDataSource ds = new ByteArrayDataSource(response.body().byteStream(), "multipart/form-data");
            MimeMultipart multipart = new MimeMultipart(ds);
            BodyPart jsonPart = multipart.getBodyPart(0);

            System.out.println("Response body = " + jsonPart.getInputStream());
            File reportFile = new File(Environment.getExternalStorageDirectory() + File.separator + "downloadedFile.jpg");
            InputStream is = jsonPart.getInputStream();
            FileOutputStream fileOutputStream = null;
            try {
                fileOutputStream = new FileOutputStream(reportFile);
                byte[] buffer = new byte[MEGABYTE];
                int bufferLength = 0;

                while ((bufferLength = is.read(buffer)) > 0) {
                    fileOutputStream.write(buffer, 0, bufferLength);
                }
                is.close();
                fileOutputStream.close();   
                  .......
            }

谁能帮我解决这个问题。我从 2 天起就被困在这里。我做错了什么。

Answer 1

您可以执行以下操作:

• 创建一个在后台运行的异步任务
• 使用 okhttp3.Request 创建请求
• 创建OkHttpClient发送请求并将响应保存在okHttp3 Response中
• 然后从 okhttp3.ResponseBody 获取响应主体，并使用 InputStreamReader 和 BufferedReader 读取文件。

像下面这样的东西应该可以工作:

private class FileTask extends AsyncTask<Void, Void, Void> {
   private File file = null;
    @Override
    protected Void doInBackground(Void... params) {

        okhttp3.Request request = new okhttp3.Request.Builder()
                .url("Your URL for getReport()")
                .get()
                .build();
        OkHttpClient okHttpClient = new OkHttpClient.Builder().
                        connectTimeout(80, TimeUnit.SECONDS)
                        .writeTimeout(80, TimeUnit.SECONDS)
                        .readTimeout(80, TimeUnit.SECONDS)
                        .build();


        try {
            Response response = okHttpClient.newCall(request).execute();
            okhttp3.ResponseBody in = response.body();
            InputStream is = in.byteStream();
            InputStreamReader inputStreamReader = new InputStreamReader(is);
            BufferedReader buffReader = new BufferedReader(inputStreamReader);

            file = new File(Environment.getExternalStorageDirectory() + File.separator + "filename.txt"); //Your output file
            OutputStream output = new FileOutputStream(file);
            BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(output);


            String line=buffReader.readLine();
            while ((line=buffReader.readLine()) != null) {
                output.write(line.getBytes());
                output.write('\n');
            }
            buffReader.close();
            output.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        //do post execution steps
        }
    }
}