使用OkHttp在multipart中上传大文件

Question

使用OKhttp在Android中的multipart中上传单个大文件（更具体地说，到s3）有哪些选择？

Answer 1

从OkHttp Recipes page开始，此代码会将图片上传到Imgur：

private static final String IMGUR_CLIENT_ID = "...";
private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");

private final OkHttpClient client = new OkHttpClient();

public void run() throws Exception {
  // Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
  RequestBody requestBody = new MultipartBuilder()
      .type(MultipartBuilder.FORM)
      .addPart(
          Headers.of("Content-Disposition", "form-data; name=\"title\""),
          RequestBody.create(null, "Square Logo"))
      .addPart(
          Headers.of("Content-Disposition", "form-data; name=\"image\""),
          RequestBody.create(MEDIA_TYPE_PNG, new File("website/static/logo-square.png")))
      .build();

  Request request = new Request.Builder()
      .header("Authorization", "Client-ID " + IMGUR_CLIENT_ID)
      .url("https://api.imgur.com/3/image")
      .post(requestBody)
      .build();

  Response response = client.newCall(request).execute();
  if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

  System.out.println(response.body().string());
}

你需要将它改编为S3，但你需要的类应该是相同的。

Answer 2

获取OkHttp 2.1，并使用MultipartBuilder.addFormDataPart()，它将文件名作为参数。

       /**
         * Upload Image
         *
         * @param memberId
         * @param sourceImageFile
         * @return
         */
        public static JSONObject uploadImage(String memberId, String sourceImageFile) {

            try {
                File sourceFile = new File(sourceImageFile);

                Log.d(TAG, "File...::::" + sourceFile + " : " + sourceFile.exists());

             final MediaType MEDIA_TYPE = sourceImageFile.endsWith("png") ? 
                MediaType.parse("image/png") : MediaType.parse("image/jpeg");


                RequestBody requestBody = new MultipartBuilder()
                        .type(MultipartBuilder.FORM)
                        .addFormDataPart("member_id", memberId)
                        .addFormDataPart("file", "profile.png", RequestBody.create(MEDIA_TYPE_PNG, sourceFile))
                        .build();

                Request request = new Request.Builder()
                        .url(URL_UPLOAD_IMAGE)
                        .post(requestBody)
                        .build();

                OkHttpClient client = new OkHttpClient();
                Response response = client.newCall(request).execute();
                return new JSONObject(response.body().string());

            } catch (UnknownHostException | UnsupportedEncodingException e) {
                Log.e(TAG, "Error: " + e.getLocalizedMessage());
            } catch (Exception e) {
                Log.e(TAG, "Other Error: " + e.getLocalizedMessage());
            }
            return null;
        }

为okhttp3编辑：

compile 'com.squareup.okhttp3:okhttp:3.4.1'

RequestBody 替换为：

RequestBody requestBody = new MultipartBody.Builder()
                    .setType(MultipartBody.FORM)
                    .addFormDataPart("uploaded_file", filename, RequestBody.create(MEDIA_TYPE_PNG, sourceFile))
                    .addFormDataPart("result", "my_image")
                    .build();

GITHUB上传的演示：

我添加了Multiple Image Upload的答案：）

Answer 3

for okhttp 2.6.0 {

    try {
        File file = new File(Environment.getExternalStorageDirectory().getPath()+"/xxx/share/" + "ic_launcher.png");
        String contentType = file.toURL().openConnection().getContentType();
        RequestBody fileBody = RequestBody.create(MediaType.parse(contentType), file);

        RequestBody requestBody = new MultipartBuilder()
                .type(MultipartBuilder.FORM)
                .addFormDataPart("fileUploadType","1")
                .addFormDataPart("miniType",contentType)
                .addFormDataPart("ext",file.getAbsolutePath().substring(file.getAbsolutePath().lastIndexOf(".")))
                .addFormDataPart("fileTypeName","img")
                .addFormDataPart("Filedata","ss.png",fileBody)
                .build();
        Request request = new Request.Builder()
                .url(Contains.MULTIPARTY_POST)
                .post(requestBody)
                .build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Request request, IOException e) {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        tvGetNews.setText("upload fail");
                    }
                });
            }

            @Override
            public void onResponse(Response response) throws IOException {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        tvGetNews.setText("upload success");
                    }
                });
            }
        });
    } catch (IOException e) {
        e.printStackTrace();
    }

}

Answer 4

对于okhttp 4. *，请使用MultipartBody.Builder：

fun postMultipart(url: String, text: String, imagePath: String, imageFileName: String): okhttp3.Response? {
    val file = File(imagePath)
    val fileRequestBody = file.asRequestBody("image/jpeg".toMediaType())
    val requestBody = MultipartBody.Builder()
        .addFormDataPart("text", text)
        .addFormDataPart("image", imageFileName, fileRequestBody)
        .build()

    val request = getRequestBuilder(url)
        .post(requestBody)
        .build()

    val client = OkHttpClient()
    client.newCall(request).execute().use { response ->
        return response
    }
}

Answer 5

在 Android 中，您通常会与 Uri 分开。使用大文件时的问题是，如果您尝试将完整流读取到字节数组（内存中的所有内容）或最终使用 Uri 流创建无用文件，则很容易遇到 OutOfMemoryError。这是因为 RequestBody 不支持从 Stream 创建（因为有时 OkHttp 需要多次读取它，例如如果您获得 30X 重定向）或 Uri（因为 OkHttp 不是一个 Android 库）。

但是 OkHttp 提供了库 Okio，具有方便的类模拟流（Source 和 Sink）和更方便的内部使用。

因此，要创建一个 BodyRequest 形式的 Uri 避免任何 OutOfMemoryError 由于大文件创建它：

private static final MediaType MULTIPART_FOR_DATA = MediaType.parse("multipart/form-data");

private @NotNull RequestBody getFilePart(Uri largeFileUri) {

        return new RequestBody() {
            @Override
            public MediaType contentType() {
                return MULTIPART_FOR_DATA;
            }

            @Override
            public void writeTo(@NotNull BufferedSink sink) throws IOException {
                try (Source source = Okio.source(context.getContentResolver().openInputStream(mediaUri))) {
                    sink.writeAll(source);
                }
            }
        };
    }

感谢在以下 GitHub 主题 https://github.com/square/okhttp/issues/3585

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