我在应用程序中使用此功能 post 在 multipart/form-data 中使用 OkHttp3 向服务器发送图像

Question

void postRequest() throws IOException {

    OkHttpClient client = new OkHttpClient();

    File file = new File(Environment.getExternalStorageDirectory().toString() + "/Image_ref.jpg");

    RequestBody requestbody = RequestBody.create(MultipartBody.FORM, file);

    Request request = new Request.Builder().
            addHeader("Authorization", "test").
            post(requestbody).
            url("MY_API").
            build();

    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            call.cancel();
        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {
            Log.d("TAG",response.body().string());
        }
    });
}

但我收到的回复是

"The request content was malformed: Content-Type with a multipart media type must have a 'boundary' parameter.

如果我做错了什么请告诉我什么是'boundary'参数以及如何设置它？

Answer 1

RequestBody requestbody = RequestBody.create(MultipartBody.FORM, file);

我建议尝试使用，我使用相同的方法发送图像，并且我使用以下方法在一个请求中发送多张图像

MultipartBody.Builder multipartBodyBuilder = new MultipartBody.Builder();
        multipartBodyBuilder.setType(MultipartBody.FORM); //this may not be needed 
multipartBodyBuilder.addFormDataPart("file", "Image_ref.jpg", RequestBody.create(MEDIA_TYPE, file) );

然后可以使用相同的请求来执行此操作

 try {
                                          Response response = oKclient.newCall(request).execute();

                                          line = response.body().string();

                                      }catch
                                              (Exception e ){
                                          e.printStackTrace();

                                      }

可变行将包含响应的主体，而响应对象是执行的实际响应，下面是我的代码显示如何同时添加多个文件，这实际上是我使用它的方式不是很优雅但完成工作

String order_data = "asdsd";
        String images = getImages(id); //my funciton returns a json array Stringified
        net.minidev.json.JSONArray fileArray = (net.minidev.json.JSONArray) net.minidev.json.JSONValue.parse(images);

        MultipartBody.Builder multipartBodyBuilder = new MultipartBody.Builder();
        multipartBodyBuilder.            setType(MultipartBody.FORM);
        multipartBodyBuilder.addFormDataPart("email", basicFunction.getUsername());
        multipartBodyBuilder.addFormDataPart("password", basicFunction.getPassword());

        multipartBodyBuilder.addFormDataPart("order_data",order_data);
        int filer = 0; // adding a php based filter this can be the php array counter
        MediaType MEDIA_TYPE = MediaType.parse("image/png" ); //
        for (Iterator<Object> flavoursIter = fileArray.iterator(); flavoursIter.hasNext();){
            net.minidev.json.JSONObject temp = (net.minidev.json.JSONObject) flavoursIter.next();
            String path = (String)temp.get("path");
            if(path.isEmpty() || path ==null ) continue;
            path = path.substring(6);
            // path = "fila://"+path;
            File file = new File(path);
            multipartBodyBuilder.addFormDataPart("file", "img.png", RequestBody.create(MEDIA_TYPE, file) );

// 如果只显示一个文件，您可以使用此代码

//multipartBodyBuilder.addFormDataPart("file["+filer++"]", "img.png", RequestBody.create(MEDIA_TYPE, file) );

        }


        MultipartBody multipartBody = multipartBodyBuilder.build();



        Request request = new Request.Builder()
                .url("Url_to_use")
                .post(multipartBody)
                .build();

我在应用程序中使用此功能 post 在 multipart/form-data 中使用 OkHttp3 向服务器发送图像

I'm using this function in an app to post an image to the server using OkHttp3 in multipart/form-data

post

android

multipartform-data

okhttp

okhttp3