上传单图

以上传头像为例

@Multipart
@POST(URLConstants.uploadAvatar)
Call<ResponseBody> uploadAvatar(@Part MultipartBody.Part imgs);

private void uploadAvatar(String path) {
        File file = new File(path);
        RequestBody requestFile = RequestBody.create(MediaType.parse("multipart/form-data"), file);
        MultipartBody.Part part = MultipartBody.Part.createFormData("file", file.getName(), requestFile);
        RetrofitUtils.getService().uploadAvatar(part).enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                if (response.isSuccessful()) {
                    
                } else {
                    
                }
            }

            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {
                
            }
        });
    }

多图和文字参数一起上传

以意见反馈页面为例

@Multipart
@POST(URLConstants.feedBack)
Call<ResponseBody> feedBack(@Part("Content") String Content,@Part("ContactInformation")String conInfo,
                                @Part() List<MultipartBody.Part> parts);

content --反馈的内容
conInfo--联系方式
具体参数由实际来定
List<MultipartBody.Part> parts--图片列表

List<MultipartBody.Part> parts = new ArrayList<>();
                for (int i = 0; i < selImageList.size(); i++) {
                    //这里采用的Compressor图片压缩
                    File file = new Compressor.Builder(FeedBackActivity.this)
                            .setMaxWidth(720)
                            .setMaxHeight(1080)
                            .setQuality(80)
                            .setCompressFormat(Bitmap.CompressFormat.JPEG)
                            .setDestinationDirectoryPath(Environment.getExternalStoragePublicDirectory(
                                    Environment.DIRECTORY_PICTURES).getAbsolutePath())
                            .build()
                            .compressToFile(new File(selImageList.get(i).path));
                    RequestBody requestFile = RequestBody.create(MediaType.parse("multipart/form-data"), file);
                    MultipartBody.Part part = MultipartBody.Part.createFormData("file", file.getName(), requestFile);
                    parts.add(part);
                }
                RetrofitUtils.getService().feedBack(etFeedBack.getText().toString(),etContact.getText().toString(),parts).enqueue(new Callback<ResponseBody>() {
                    @Override
                    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                        if (response.isSuccessful()) {
                           
                        } else {
                            
                        }
                    }

                    @Override
                    public void onFailure(Call<ResponseBody> call, Throwable t) {
                        
                    }
                });

以下是上传图文的一个坑

@Multipart
@POST(URLConstants.feedBack)
Call<ResponseBody> feedBack(@Part("Content") String Content,@Part("ContactInformation")String conInfo,
                                @Part() List<MultipartBody.Part> parts);

如上，Content 和 conInfo 以String上传的话，服务端接收到的参数会带双引号

解决办法：用RequestBody上传

@Multipart
@POST(URLConstants.feedBack)
Call<ResponseBody> feedBack(@Part("Content") RequestBody Content,@Part("ContactInformation")RequestBody conInfo,
                                @Part() List<MultipartBody.Part> parts);

String转RequestBody方法：

public RequestBody toRequestBody(String value) {
        RequestBody requestBody = RequestBody.create(MediaType.parse("text/plain"), value);
        return requestBody;
    }

参考链接