使用 Retrofit 上传带有 json 对象的文件

Question

我想上传带有 JSON 对象的文件。我正在使用 Retrofit2，但收到 400 Bad request。\n我使用curl的请求示例：

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curl -X POST http://localhost:8082/attachment -F filename=37.pdf -F \'data={"DocumentTypeID":2, "DocumentID":1, "Description":"\xd0\xbe\xd0\xbf\xd0\xb8\xd1\x81\xd0\xb0\xd0\xbd\xd0\xb8\xd0\xb5","AttachmentTypeId":2}\'\n

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我还在邮递员中提出了请求，它也有效：\n

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我的Java代码：

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        Uri path = Uri.fromFile(file);\n        RequestBody requestFile =\n                RequestBody.create(\n                        MediaType.parse(getMimeType(path)),\n                        file\n                );\n\n        MultipartBody.Part body =\n                MultipartBody.Part.createFormData("filename", file.getName(), requestFile);\n\n        FileDescriptionObject fdo = new FileDescriptionObject();\n        fdo.setDescription("test");\n        fdo.setDocumentId(fileModel.Id);\n        fdo.setDocumentTypeId(1);\n        fdo.setAttachmentTypeId(2);\n        Gson gson = new Gson();\n        String ds1 = gson.toJson(fdo);\n\n        RequestBody description =\n                RequestBody.create(\n                        MediaType.parse("text/plain"), ds1);\n\n        Call<ResponseBody> call = activity.getAsyncHelper().getWebService().postFile(\n                "http://localhost:8082/attachment",\n                body,\n                description);\n

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我的API：

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    @Multipart\n    @POST\n    Call<ResponseBody> postFile(@Url String url,\n                                @Part MultipartBody.Part file,\n                                @Part("data")RequestBody data);\n

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我的日志：

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D/OkHttp: --> POST http://localhost:8082/attachment\n          Content-Type: multipart/form-data; boundary=520da8f2-5fac-4567-be0f-61618cc881bd\nD/OkHttp: Content-Length: 468\nD/OkHttp: --520da8f2-5fac-4567-be0f-61618cc881bd\nD/OkHttp: Content-Disposition: form-data; name="filename"; filename="4.pdf"\n          Content-Type: application/pdf\n          Content-Length: 3\n          323\n          --520da8f2-5fac-4567-be0f-61618cc881bd\n          Content-Disposition: form-data; name="data"\n          Content-Transfer-Encoding: binary\n          Content-Type: text/plain; charset=utf-8\n          Content-Length: 77\n          {"AttachmentTypeId":2,"Description":"test","DocumentId":4,"DocumentTypeId":1}\n          --520da8f2-5fac-4567-be0f-61618cc881bd--\n          --> END POST (468-byte body)\n

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也许问题出在 json 数据的附加标头中？我认为是这样，因为在邮递员中它们没有被添加。

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Answer 1

改变

RequestBody description = RequestBody.create(MediaType.parse("text/plain"), ds1);

到

MultipartBody.Part description = MultipartBody.Part.createFormData("data", ds1);

看看是否有效。还将您的 API 调用更改为

@Multipart
@POST
Call<ResponseBody> postFile(@Url String url,
                            @Part MultipartBody.Part file,
                            @Part MultipartBody.Part data);